public void AndIsShortcircuit()
{
IExpression falseexpr = new ConstantExpression(false);
IExpression dividebyzero = new BinaryOperatorExpression(new ConstantExpression(1), new ConstantExpression(0), BinaryOperator.Divide);
Assert.IsFalse((bool)(new BooleanExpression(falseexpr, dividebyzero, BooleanOperator.And)).Evaluate(null));
}
public Node Parse()
{
Expression curExpr = null;
for (; ; ) {
_tokens.MoveNext();
Token t = _tokens.Current;
switch (t.Kind) {
case TokenKinds.EOF:
return curExpr;
case TokenKinds.Operator:
if (curExpr == null) {
throw new SyntaxErrorException("expected value before operator");
}
curExpr = ActionExpression.Operator(((OperatorToken)t).DlrOperator,
curExpr,
(Expression)Parse());
break;
case TokenKinds.Constant:
curExpr = new ConstantExpression(((ConstantToken)t).Value);
break;
}
}
}
public void OrIsShortcircuit()
{
IExpression trueexpr = new ConstantExpression(true);
IExpression dividebyzero = new BinaryOperatorExpression(new ConstantExpression(1), new ConstantExpression(0), BinaryOperator.Divide);
Assert.IsTrue((bool)(new BooleanExpression(trueexpr, dividebyzero, BooleanOperator.Or)).Evaluate(null));
}
public void CreateNotExpression()
{
IExpression trueexpr = new ConstantExpression(true);
NotExpression expression = new NotExpression(trueexpr);
Assert.AreEqual(trueexpr, expression.Expression);
}
public void EvaluateNotExpression()
{
IExpression trueexpr = new ConstantExpression(true);
IExpression falseexpr = new ConstantExpression(false);
Assert.IsFalse((bool)(new NotExpression(trueexpr)).Evaluate(null));
Assert.IsTrue((bool)(new NotExpression(falseexpr)).Evaluate(null));
}
public void SetVariable()
{
IExpression expression = new ConstantExpression(1);
BindingEnvironment environment = new BindingEnvironment();
ICommand command = new SetCommand("spam", expression);
command.Execute(environment);
Assert.AreEqual(1, environment.GetValue("spam"));
}
public void EvaluateOr()
{
IExpression trueexpr = new ConstantExpression(true);
IExpression falseexpr = new ConstantExpression(false);
Assert.IsTrue((bool)(new BooleanExpression(trueexpr, trueexpr, BooleanOperator.Or)).Evaluate(null));
Assert.IsTrue((bool)(new BooleanExpression(trueexpr, falseexpr, BooleanOperator.Or)).Evaluate(null));
Assert.IsTrue((bool)(new BooleanExpression(falseexpr, trueexpr, BooleanOperator.Or)).Evaluate(null));
Assert.IsFalse((bool)(new BooleanExpression(falseexpr, falseexpr, BooleanOperator.Or)).Evaluate(null));
}
public void CreateBooleanExpression()
{
IExpression trueexpr = new ConstantExpression(true);
IExpression falseexpr = new ConstantExpression(false);
BooleanExpression expression = new BooleanExpression(trueexpr, falseexpr, BooleanOperator.Or);
Assert.AreEqual(trueexpr, expression.Left);
Assert.AreEqual(falseexpr, expression.Right);
Assert.AreEqual(BooleanOperator.Or, expression.Operation);
}
public void ExecuteSetIndexCommandOnList()
{
var list = new List<object>() { 1, 2, 2 };
IExpression targetExpression = new ConstantExpression(list);
IExpression indexExpression = new ConstantExpression(2);
IExpression valueExpression = new ConstantExpression(3);
var command = new SetIndexCommand(targetExpression, indexExpression, valueExpression);
command.Execute(null);
Assert.AreEqual(3, list[2]);
}
public void CreateSetIndexCommand()
{
IExpression targetExpression = new ConstantExpression(1);
IExpression indexExpression = new ConstantExpression(2);
IExpression valueExpression = new ConstantExpression(3);
var command = new SetIndexCommand(targetExpression, indexExpression, valueExpression);
Assert.AreEqual(targetExpression, command.TargetExpression);
Assert.AreEqual(indexExpression, command.IndexExpression);
Assert.AreEqual(valueExpression, command.Expression);
}
public void ExecuteSetIndexCommandOnArray()
{
var array = new object[] { 1, 2, 2 };
IExpression targetExpression = new ConstantExpression(array);
IExpression indexExpression = new ConstantExpression(2);
IExpression valueExpression = new ConstantExpression(3);
var command = new SetIndexCommand(targetExpression, indexExpression, valueExpression);
command.Execute(null);
Assert.AreEqual(3, array[2]);
}
public void AConstant_ShouldReturnTheConstantValue()
{
// Arrange
var expectedValue = 3;
var sut = new ConstantExpression(expectedValue);
// Act
var actual = sut.Eval();
// Assert
Assert.AreEqual(expectedValue, actual);
}
public void CreateSetCommand()
{
IExpression expression = new ConstantExpression("bar");
SetCommand command = new SetCommand("foo", expression);
Assert.IsNotNull(command);
Assert.IsNotNull(command.Target);
Assert.IsNotNull(command.Expression);
Assert.AreEqual("foo", command.Target);
Assert.AreEqual(expression, command.Expression);
}
public void ExecuteSetIndexCommandOnDictionary()
{
var dictionary = new Hashtable();
IExpression targetExpression = new ConstantExpression(dictionary);
IExpression indexExpression = new ConstantExpression("foo");
IExpression valueExpression = new ConstantExpression("bar");
var command = new SetIndexCommand(targetExpression, indexExpression, valueExpression);
command.Execute(null);
Assert.AreEqual("bar", dictionary["foo"]);
}
/// <summary>
/// Performs reverse-mode (adjoint) automatic differentiation
/// </summary>
/// <param name="builder"></param>
/// <param name="dependentVariable"></param>
/// <param name="independentVariables"></param>
public static void Differentiate(BlockExpressionBuilder builder,
out IList<Expression> derivativeExpressions,
VectorParameterExpression dependentVariable,
params VectorParameterExpression[] independentVariables)
{
if (independentVariables.Length == 0)
{
derivativeExpressions = null;
return;
}
var block = builder.ToBlock();
// change the numbering of variables; arguments first, then locals
List<int>[] jLookup;
Function[] f;
// we want a list of functions which can be unary or binary (in principle high order if it makes sense) and a look-up
// each function is associated with a parameter, which is either an argument or a local
// for each function index we return a list of the indices of the functions that reference the parameter
GetFunctions(block, out f, out jLookup);
int N = dependentVariable.Index;
bool[] derivativeRequired; int[] derivativeExpressionIndex;
IdentifyNeccesaryDerivatives(N, jLookup, independentVariables, out derivativeRequired, out derivativeExpressionIndex);
// the list of operations needed to calculate the derivatives (*all* derivatives)
derivativeExpressions = new Expression[independentVariables.Length];
var dxNdx = new Expression[N + 1];
dxNdx[N] = new ConstantExpression<double>(1.0);
for (int i = N - 1; i >= 0; i--)
{
if (!derivativeRequired[i]) continue;
// dxN / dxi
// need to find all operation indices j such that p(j) contains i
// that is, all functions that have xi as an argument (these must therefore have a higher index than i)
VectorParameterExpression total = new ConstantExpression<double>(0);
var xi = f[i].Parameter;
//need sum of dfj/dxi dXN/dxj
foreach (var j in jLookup[i])
{
var fj = f[j];
var dfjdxi = Differentiate(fj, xi, builder); // dfj/dxi
var dXNdxj = dxNdx[j]; // dXN/dxj
var product = builder.AddProductExpression(dfjdxi, dXNdxj);
total = builder.AddAdditionExpression(total, product);
}
dxNdx[i] = total;
int targetIndex = derivativeExpressionIndex[i];
if (targetIndex != -1) derivativeExpressions[targetIndex] = total;
}
}
/// <summary>
/// Adds the specified constant expression.
/// </summary>
/// <param name="constantExpression">The constant expression.</param>
/// <param name="exponent">The exponent.</param>
public void Add(ConstantExpression constantExpression, double exponent)
{
var additionalConstant = Math.Pow(constantExpression.Constant, exponent);
if (this.constantFlatIdentifierRepresentation == null)
{
this.constantFlatIdentifierRepresentation = new ConstantFlatIdentifierRepresentation(additionalConstant);
this.additionalCount++;
}
else
{
this.constantFlatIdentifierRepresentation =
new ConstantFlatIdentifierRepresentation(
this.constantFlatIdentifierRepresentation.Constant * additionalConstant);
}
}
static void Main(string[] args)
{
IArithmeticVisitor visitor = new ConsoleArithmeticVisitor();
IArithmeticExpression leftInnerNode = new ConstantExpression(39);
IArithmeticExpression rightInnerNode = new ConstantExpression(13);
IArithmeticExpression leftNode = new ConstantExpression(15);
IArithmeticExpression rightNode = new SubtractionExpression(leftInnerNode, rightInnerNode);
IArithmeticExpression rootNode = new MultiplicationExpression(leftNode, new BracketsExpression(rightNode));
rootNode.Accept(visitor);
Console.WriteLine();
}
protected override Expression VisitConstant(ConstantExpression c)
{
return base.VisitConstant(c);
}
public IQueryable <Product> SetWhere(IQueryable <Product> source)
{
// Queries
if (queryParams.Queries != null && queryParams.Queries.Count() > 0)
{
ParameterExpression product = Expression.Parameter(typeof(Product));
BinaryExpression GetQueries(IEnumerable <Query> queries)
{
List <BinaryExpression> left = new List <BinaryExpression>();
BinaryExpression right = null;
foreach (Query query in queries)
{
// Auto
if (query.QueryType == QueryType.Auto)
{
// Browsed Products
if (query.IntValue == 1)
{
if (queryParams.Cookies == null || queryParams.Cookies.Count(x => x.Key == "browse") == 0)
{
continue;
}
string browseCookie = queryParams.Cookies.Where(x => x.Key == "browse").Select(x => x.Value).SingleOrDefault();
if (browseCookie == null)
{
continue;
}
List <int> productIds = browseCookie.Split(',').Select(x => Int32.Parse(x)).ToList();
PropertyInfo productProperty = typeof(Product).GetProperty("Id");
MemberExpression productId = Expression.Property(product, productProperty);
ConstantExpression values = Expression.Constant(productIds);
MethodInfo method = productIds.GetType().GetMethod("Contains");
MethodCallExpression call = Expression.Call(values, method, productId);
right = Expression.Equal(call, Expression.Constant(true));
}
// Related products
else if (query.IntValue == 2 && queryParams.ProductId > 0)
{
PropertyInfo nicheProperty = typeof(Product).GetProperty("NicheId");
PropertyInfo idProperty = typeof(Product).GetProperty("Id");
MemberExpression id = Expression.Property(product, idProperty);
ConstantExpression productId = Expression.Constant(queryParams.ProductId);
MemberExpression nicheId = Expression.Property(product, nicheProperty);
ConstantExpression value = Expression.Constant(query.IntValues[0]);
right = Expression.AndAlso(Expression.Equal(nicheId, value), Expression.NotEqual(id, productId));
}
}
// Category
else if (query.QueryType == QueryType.Category)
{
PropertyInfo categoryProperty1 = typeof(Product).GetProperty("Niche");
PropertyInfo categoryProperty2 = categoryProperty1.PropertyType.GetProperty("Category");
PropertyInfo categoryProperty3 = categoryProperty2.PropertyType.GetProperty("Id");
MemberExpression niche = Expression.Property(product, categoryProperty1);
MemberExpression niche_Category = Expression.Property(niche, categoryProperty2);
MemberExpression niche_Category_Id = Expression.Property(niche_Category, categoryProperty3);
ConstantExpression value = Expression.Constant(query.IntValue);
right = Expression.Equal(niche_Category_Id, value);
}
// Niche
else if (query.QueryType == QueryType.Niche)
{
if (query.IntValue > 0)
{
PropertyInfo nicheProperty = typeof(Product).GetProperty("NicheId");
MemberExpression nicheId = Expression.Property(product, nicheProperty);
ConstantExpression value = Expression.Constant(query.IntValue);
right = Expression.Equal(nicheId, value);
}
else
{
PropertyInfo categoryProperty1 = typeof(Product).GetProperty("Niche");
PropertyInfo categoryProperty2 = categoryProperty1.PropertyType.GetProperty("UrlId");
MemberExpression niche = Expression.Property(product, categoryProperty1);
MemberExpression niche_Url_Id = Expression.Property(niche, categoryProperty2);
ConstantExpression value = Expression.Constant(query.StringValue);
right = Expression.Equal(niche_Url_Id, value);
}
}
// Product Rating
else if (query.QueryType == QueryType.ProductRating)
{
PropertyInfo ratingProperty = typeof(Product).GetProperty("Rating");
MemberExpression rating = Expression.Property(product, ratingProperty);
ConstantExpression value = Expression.Constant(query.DoubleValue);
if (query.ComparisonOperator == ComparisonOperatorType.Equal)
{
right = Expression.Equal(rating, value);
}
if (query.ComparisonOperator == ComparisonOperatorType.NotEqual)
{
right = Expression.NotEqual(rating, value);
}
if (query.ComparisonOperator == ComparisonOperatorType.GreaterThan)
{
right = Expression.GreaterThan(rating, value);
}
if (query.ComparisonOperator == ComparisonOperatorType.GreaterThanOrEqual)
{
right = Expression.GreaterThanOrEqual(rating, value);
}
if (query.ComparisonOperator == ComparisonOperatorType.LessThan)
{
right = Expression.LessThan(rating, value);
}
if (query.ComparisonOperator == ComparisonOperatorType.LessThanOrEqual)
{
right = Expression.LessThanOrEqual(rating, value);
}
}
// Product Price
else if (query.QueryType == QueryType.ProductPrice)
{
PropertyInfo priceProperty1 = typeof(Product).GetProperty("MinPrice");
PropertyInfo priceProperty2 = typeof(Product).GetProperty("MaxPrice");
MemberExpression minPrice = Expression.Property(product, priceProperty1);
MemberExpression maxPrice = Expression.Property(product, priceProperty2);
ConstantExpression zero = Expression.Constant(0.0);
ConstantExpression value = Expression.Constant(query.DoubleValue);
if (query.ComparisonOperator == ComparisonOperatorType.Equal)
{
right = Expression.OrElse(Expression.AndAlso(Expression.Equal(maxPrice, zero), Expression.Equal(minPrice, value)), Expression.Equal(maxPrice, value));
}
if (query.ComparisonOperator == ComparisonOperatorType.NotEqual)
{
right = Expression.OrElse(Expression.AndAlso(Expression.Equal(maxPrice, zero), Expression.NotEqual(minPrice, value)), Expression.NotEqual(maxPrice, value));
}
if (query.ComparisonOperator == ComparisonOperatorType.GreaterThan)
{
right = Expression.OrElse(Expression.AndAlso(Expression.Equal(maxPrice, zero), Expression.GreaterThan(minPrice, value)), Expression.GreaterThan(maxPrice, value));
}
if (query.ComparisonOperator == ComparisonOperatorType.GreaterThanOrEqual)
{
right = Expression.OrElse(Expression.AndAlso(Expression.Equal(maxPrice, zero), Expression.GreaterThanOrEqual(minPrice, value)), Expression.GreaterThanOrEqual(maxPrice, value));
}
if (query.ComparisonOperator == ComparisonOperatorType.LessThan)
{
right = Expression.OrElse(Expression.AndAlso(Expression.Equal(maxPrice, zero), Expression.LessThan(minPrice, value)), Expression.LessThan(maxPrice, value));
}
if (query.ComparisonOperator == ComparisonOperatorType.LessThanOrEqual)
{
right = Expression.OrElse(Expression.AndAlso(Expression.Equal(maxPrice, zero), Expression.LessThanOrEqual(minPrice, value)), Expression.LessThanOrEqual(maxPrice, value));
}
}
// Product Subgroup, Product Keywords, or Featured Products
else if (query.QueryType == QueryType.ProductSubgroup || query.QueryType == QueryType.ProductKeywords || query.QueryType == QueryType.FeaturedProducts)
{
PropertyInfo productProperty = typeof(Product).GetProperty("Id");
MemberExpression productId = Expression.Property(product, productProperty);
ConstantExpression values = Expression.Constant(query.IntValues);
MethodInfo method = query.IntValues.GetType().GetMethod("Contains");
MethodCallExpression call = Expression.Call(values, method, productId);
right = Expression.Equal(call, Expression.Constant(true));
}
// Product Creation Date
else if (query.QueryType == QueryType.ProductCreationDate)
{
PropertyInfo dateProperty = typeof(Product).GetProperty("Date");
MemberExpression date = Expression.Property(product, dateProperty);
ConstantExpression value = Expression.Constant(query.DateValue);
if (query.ComparisonOperator == ComparisonOperatorType.Equal)
{
right = Expression.Equal(date, value);
}
if (query.ComparisonOperator == ComparisonOperatorType.NotEqual)
{
right = Expression.NotEqual(date, value);
}
if (query.ComparisonOperator == ComparisonOperatorType.GreaterThan)
{
right = Expression.GreaterThan(date, value);
}
if (query.ComparisonOperator == ComparisonOperatorType.GreaterThanOrEqual)
{
right = Expression.GreaterThanOrEqual(date, value);
}
if (query.ComparisonOperator == ComparisonOperatorType.LessThan)
{
right = Expression.LessThan(date, value);
}
if (query.ComparisonOperator == ComparisonOperatorType.LessThanOrEqual)
{
right = Expression.LessThanOrEqual(date, value);
}
}
// Subquery
else if (query.QueryType == QueryType.SubQuery)
{
right = GetQueries(query.SubQueries);
}
if (left.Count == 0)
{
left.Add(right);
}
if (left[^ 1] != right)
protected virtual Expression VisitConstant(ConstantExpression node)
{
return(null);
}
protected override Expression VisitConstant(ConstantExpression node)
{
this.count = (int)node.Value;
return(base.VisitConstant(node));
}
static void DisplayTree(int indent, string message, Expression expression)
{
string output = $"{string.Empty.PadLeft(indent, '>')}{message}" + $"!NodeType:{expression.NodeType};Expr:{expression}";
indent++;
switch (expression.NodeType)
{
case ExpressionType.Add:
break;
case ExpressionType.AddAssign:
break;
case ExpressionType.AddAssignChecked:
break;
case ExpressionType.AddChecked:
break;
case ExpressionType.And:
break;
case ExpressionType.AndAlso:
break;
case ExpressionType.AndAssign:
break;
case ExpressionType.ArrayIndex:
break;
case ExpressionType.ArrayLength:
break;
case ExpressionType.Assign:
break;
case ExpressionType.Block:
break;
case ExpressionType.Call:
break;
case ExpressionType.Coalesce:
break;
case ExpressionType.Conditional:
break;
case ExpressionType.Constant:
ConstantExpression constExpr = (ConstantExpression)expression;
Console.WriteLine($"{output} Const Value{constExpr.Value}");
break;
case ExpressionType.Convert:
break;
case ExpressionType.ConvertChecked:
break;
case ExpressionType.DebugInfo:
break;
case ExpressionType.Decrement:
break;
case ExpressionType.Default:
break;
case ExpressionType.Divide:
break;
case ExpressionType.DivideAssign:
break;
case ExpressionType.Dynamic:
break;
case ExpressionType.Equal:
break;
case ExpressionType.ExclusiveOr:
break;
case ExpressionType.ExclusiveOrAssign:
break;
case ExpressionType.Extension:
break;
case ExpressionType.Goto:
break;
case ExpressionType.GreaterThan:
BinaryExpression binExpr = (BinaryExpression)expression;
if (binExpr.Method != null)
{
Console.WriteLine($"{output} Method:{binExpr.Method.Name}");
}
else
{
Console.WriteLine(output);
}
DisplayTree(indent, "Left", binExpr.Left);
DisplayTree(indent, "Right", binExpr.Right);
break;
case ExpressionType.GreaterThanOrEqual:
break;
case ExpressionType.Increment:
break;
case ExpressionType.Index:
break;
case ExpressionType.Invoke:
break;
case ExpressionType.IsFalse:
break;
case ExpressionType.IsTrue:
break;
case ExpressionType.Label:
break;
case ExpressionType.Lambda:
Console.WriteLine(output);
LambdaExpression lambdaExpression = (LambdaExpression)expression;
foreach (var parameter in lambdaExpression.Parameters)
{
DisplayTree(indent, "Parameter", parameter);
}
DisplayTree(indent, "Body", lambdaExpression.Body);
break;
case ExpressionType.LeftShift:
break;
case ExpressionType.LeftShiftAssign:
break;
case ExpressionType.LessThan:
break;
case ExpressionType.LessThanOrEqual:
break;
case ExpressionType.ListInit:
break;
case ExpressionType.Loop:
break;
case ExpressionType.MemberAccess:
MemberExpression memberExpr = (MemberExpression)expression;
Console.WriteLine($"{output}Member Name{memberExpr.Member.Name}Type{memberExpr.Expression}");
break;
case ExpressionType.MemberInit:
break;
case ExpressionType.Modulo:
break;
case ExpressionType.ModuloAssign:
break;
case ExpressionType.Multiply:
break;
case ExpressionType.MultiplyAssign:
break;
case ExpressionType.MultiplyAssignChecked:
break;
case ExpressionType.MultiplyChecked:
break;
case ExpressionType.Negate:
break;
case ExpressionType.NegateChecked:
break;
case ExpressionType.New:
break;
case ExpressionType.NewArrayBounds:
break;
case ExpressionType.NewArrayInit:
break;
case ExpressionType.Not:
break;
case ExpressionType.NotEqual:
break;
case ExpressionType.OnesComplement:
break;
case ExpressionType.Or:
break;
case ExpressionType.OrAssign:
break;
case ExpressionType.OrElse:
break;
case ExpressionType.Parameter:
ParameterExpression paramExpr = (ParameterExpression)expression;
Console.WriteLine($"{output} Param Type:{paramExpr.Type.Name}");
break;
case ExpressionType.PostDecrementAssign:
break;
case ExpressionType.PostIncrementAssign:
break;
case ExpressionType.Power:
break;
case ExpressionType.PowerAssign:
break;
case ExpressionType.PreDecrementAssign:
break;
case ExpressionType.PreIncrementAssign:
break;
case ExpressionType.Quote:
break;
case ExpressionType.RightShift:
break;
case ExpressionType.RightShiftAssign:
break;
case ExpressionType.RuntimeVariables:
break;
case ExpressionType.Subtract:
break;
case ExpressionType.SubtractAssign:
break;
case ExpressionType.SubtractAssignChecked:
break;
case ExpressionType.SubtractChecked:
break;
case ExpressionType.Switch:
break;
case ExpressionType.Throw:
break;
case ExpressionType.Try:
break;
case ExpressionType.TypeAs:
break;
case ExpressionType.TypeEqual:
break;
case ExpressionType.TypeIs:
break;
case ExpressionType.UnaryPlus:
break;
case ExpressionType.Unbox:
break;
default:
Console.WriteLine();
Console.WriteLine($"{expression.NodeType}{expression.Type.Name}");
break;
}
}
/// <summary>
/// 验证重复数据
/// </summary>
protected void ValidateDuplicateData()
{
//获取设定的重复字段信息
var checkCondition = SetDuplicatedCheck();
if (checkCondition != null && checkCondition.Groups.Count > 0)
{
//生成基础Query
var baseExp = DC.Set <TModel>().AsQueryable();
var modelType = typeof(TModel);
ParameterExpression para = Expression.Parameter(modelType, "tm");
//循环所有重复字段组
foreach (var group in checkCondition.Groups)
{
List <Expression> conditions = new List <Expression>();
//生成一个表达式，类似于 x=>x.Id != id，这是为了当修改数据时验证重复性的时候，排除当前正在修改的数据
MemberExpression idLeft = Expression.Property(para, "Id");
ConstantExpression idRight = Expression.Constant(Entity.ID);
BinaryExpression idNotEqual = Expression.NotEqual(idLeft, idRight);
conditions.Add(idNotEqual);
List <PropertyInfo> props = new List <PropertyInfo>();
//在每个组中循环所有字段
foreach (var field in group.Fields)
{
Expression exp = field.GetExpression(Entity, para);
if (exp != null)
{
conditions.Add(exp);
}
//将字段名保存，为后面生成错误信息作准备
props.AddRange(field.GetProperties());
}
int count = 0;
if (conditions.Count > 1)
{
//循环添加条件并生成Where语句
Expression conExp = conditions[0];
for (int i = 1; i < conditions.Count; i++)
{
conExp = Expression.And(conExp, conditions[i]);
}
MethodCallExpression whereCallExpression = Expression.Call(
typeof(Queryable),
"Where",
new Type[] { modelType },
baseExp.Expression,
Expression.Lambda <Func <TModel, bool> >(conExp, new ParameterExpression[] { para }));
var result = baseExp.Provider.CreateQuery(whereCallExpression);
foreach (var res in result)
{
count++;
}
}
if (count > 0)
{
//循环拼接所有字段名
string AllName = "";
foreach (var prop in props)
{
string name = PropertyHelper.GetPropertyDisplayName(prop);
AllName += name + ",";
}
if (AllName.EndsWith(","))
{
AllName = AllName.Remove(AllName.Length - 1);
}
//如果只有一个字段重复，则拼接形成 xxx字段重复 这种提示
if (props.Count == 1)
{
MSD.AddModelError(GetValidationFieldName(props[0])[0], AllName + "字段重复");
}
//如果多个字段重复，则拼接形成 xx，yy，zz组合字段重复 这种提示
else if (props.Count > 1)
{
MSD.AddModelError(GetValidationFieldName(props.First())[0], AllName + "字段组合重复");
}
}
}
}
}
protected override object VisitConstant(ConstantExpression exp)
{
return(exp.Value);
}
protected virtual Expression VisitConstant(ConstantExpression c)
{
return(c);
}
static object GetValue(ConstantExpression methodCall)
{
return(methodCall.Value);
}
/// <summary>
/// CompareConstant
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
protected virtual int CompareConstant(ConstantExpression x, ConstantExpression y)
{
return(Comparer.Default.Compare(x.Value, y.Value));
}
protected override Expression VisitConstant(ConstantExpression node)
{
return(base.VisitConstant(node));
}
protected virtual Expression VisitConstantExpression(ConstantExpression expression)
{
ArgumentUtility.CheckNotNull("expression", expression);
return(expression);
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public abstract bool TryPrintConstant(
[NotNull] ConstantExpression constantExpression,
[NotNull] IndentedStringBuilder stringBuilder,
bool removeFormatting);
private static string Resolve(Expression expression)
{
if (expression is LambdaExpression)
{
LambdaExpression lambda = expression as LambdaExpression;
expression = lambda.Body;
return(Resolve(expression));
}
if (expression is BinaryExpression)
{
BinaryExpression binary = expression as BinaryExpression;
if (binary.Left is MemberExpression && binary.Right is ConstantExpression)//解析x=>x.Name=="123" x.Age==123这类
{
return(ResolveFunc(binary.Left, binary.Right, binary.NodeType));
}
if (binary.Left is MethodCallExpression && binary.Right is ConstantExpression)//解析x=>x.Name.Contains("xxx")==false这类的
{
object value = (binary.Right as ConstantExpression).Value;
return(ResolveLinqToObject(binary.Left, value, binary.NodeType));
}
if ((binary.Left is MemberExpression && binary.Right is MemberExpression) ||
(binary.Left is MemberExpression && binary.Right is UnaryExpression)) //解析x=>x.Date==DateTime.Now这种
{
LambdaExpression lambda = Expression.Lambda(binary.Right);
Delegate fn = lambda.Compile();
ConstantExpression value = Expression.Constant(fn.DynamicInvoke(null), binary.Right.Type);
return(ResolveFunc(binary.Left, value, binary.NodeType));
}
}
if (expression is UnaryExpression)
{
UnaryExpression unary = expression as UnaryExpression;
if (unary.Operand is MethodCallExpression)//解析!x=>x.Name.Contains("xxx")或!array.Contains(x.Name)这类
{
return(ResolveLinqToObject(unary.Operand, false));
}
if (unary.Operand is MemberExpression && unary.NodeType == ExpressionType.Not)//解析x=>!x.isDeletion这样的
{
ConstantExpression constant = Expression.Constant(false);
return(ResolveFunc(unary.Operand, constant, ExpressionType.Equal));
}
}
if (expression is MemberExpression && expression.NodeType == ExpressionType.MemberAccess)//解析x=>x.isDeletion这样的
{
MemberExpression member = expression as MemberExpression;
ConstantExpression constant = Expression.Constant(true);
return(ResolveFunc(member, constant, ExpressionType.Equal));
}
if (expression is MethodCallExpression)//x=>x.Name.Contains("xxx")或array.Contains(x.Name)这类
{
MethodCallExpression methodcall = expression as MethodCallExpression;
return(ResolveLinqToObject(methodcall, true));
}
var body = expression as BinaryExpression;
//已经修改过代码body应该不会是null值了
if (body == null)
{
return(string.Empty);
}
var Operator = GetOperator(body.NodeType);
var Left = Resolve(body.Left);
var Right = Resolve(body.Right);
string Result = string.Format("({0} {1} {2})", Left, Operator, Right);
return(Result);
}
//表达式路由计算
public static string ExpressionRouter(Expression exp)
{
if (exp is MemberExpression)
{
MemberExpression me = ((MemberExpression)exp);
return(me.Member.Name);
}
else if (exp is NewArrayExpression)
{
NewArrayExpression ae = ((NewArrayExpression)exp);
StringBuilder tmpstr = new StringBuilder();
foreach (Expression ex in ae.Expressions)
{
tmpstr.Append(ExpressionRouter(ex));
tmpstr.Append(",");
}
return(tmpstr.ToString(0, tmpstr.Length - 1));
}
else if (exp is MethodCallExpression)
{
MethodCallExpression mce = (MethodCallExpression)exp;
if (mce.Method.Name == "Like")
{
return(string.Format("({0} LIKE {1})", ExpressionRouter(mce.Arguments[0]), ExpressionRouter(mce.Arguments[1])));
}
else if (mce.Method.Name == "NotLike")
{
return(string.Format("({0} Not LIKE {1})", ExpressionRouter(mce.Arguments[0]), ExpressionRouter(mce.Arguments[1])));
}
else if (mce.Method.Name == "In")
{
return(string.Format("{0} IN ({1})", ExpressionRouter(mce.Arguments[0]), ExpressionRouter(mce.Arguments[1])));
}
else if (mce.Method.Name == "NotIn")
{
return(string.Format("{0} NOT IN ({1})", ExpressionRouter(mce.Arguments[0]), ExpressionRouter(mce.Arguments[1])));
}
}
else if (exp is ConstantExpression)
{
ConstantExpression ce = ((ConstantExpression)exp);
if (ce.Value == null)
{
return("null");
}
else if (ce.Value is ValueType)
{
return(ce.Value.ToString());
}
else if (ce.Value is string || ce.Value is DateTime || ce.Value is char)
{
return(string.Format("'{0}'", ce.Value.ToString()));
}
}
else if (exp is UnaryExpression)
{
UnaryExpression ue = ((UnaryExpression)exp);
return(ExpressionRouter(ue.Operand));
}
return(null);
}
protected virtual void VisitConstant(ConstantExpression node)
{
ConstantReference(node?.Value);
}
/// <summary>
/// Generates the node structure required to generate a default
/// initialization.
/// </summary>
/// <param name = "p">
/// Tools.Parser instance to use when instantiating nodes.
/// </param>
/// <param name = "constantType">String describing the datatype.</param>
/// <returns>
/// A SYMBOL node conaining the appropriate structure for intializing a
/// constantType.
/// </returns>
private SYMBOL GetZeroConstant(Parser p, string constantType)
{
switch (constantType)
{
case "integer":
return new Constant(p, constantType, "0");
case "float":
return new Constant(p, constantType, "0.0");
case "string":
case "key":
return new Constant(p, constantType, "");
case "list":
ArgumentList al = new ArgumentList(p);
return new ListConstant(p, al);
case "vector":
Constant vca = new Constant(p, "float", "0.0");
Constant vcb = new Constant(p, "float", "0.0");
Constant vcc = new Constant(p, "float", "0.0");
ConstantExpression vcea = new ConstantExpression(p, vca);
ConstantExpression vceb = new ConstantExpression(p, vcb);
ConstantExpression vcec = new ConstantExpression(p, vcc);
return new VectorConstant(p, vcea, vceb, vcec);
case "rotation":
Constant rca = new Constant(p, "float", "0.0");
Constant rcb = new Constant(p, "float", "0.0");
Constant rcc = new Constant(p, "float", "0.0");
Constant rcd = new Constant(p, "float", "0.0");
ConstantExpression rcea = new ConstantExpression(p, rca);
ConstantExpression rceb = new ConstantExpression(p, rcb);
ConstantExpression rcec = new ConstantExpression(p, rcc);
ConstantExpression rced = new ConstantExpression(p, rcd);
return new RotationConstant(p, rcea, rceb, rcec, rced);
default:
return null; // this will probably break stuff
}
}
/// <summary>
/// Creates a <see cref="ConstantExpression"/> that has the <see cref="P:ConstantExpression.Value"/> property set to the specified value. .
/// </summary>
/// <param name="value">An <see cref="System.Object"/> to set the <see cref="P:ConstantExpression.Value"/> property equal to.</param>
/// <returns>
/// A <see cref="ConstantExpression"/> that has the <see cref="P:Expression.NodeType"/> property equal to
/// <see cref="F:ExpressionType.Constant"/> and the <see cref="P:Expression.Value"/> property set to the specified value.
/// </returns>
public static ConstantExpression Constant(object value)
{
return(ConstantExpression.Make(value, value == null ? typeof(object) : value.GetType()));
}
static object GetRuntimeConstant(ConstantExpression ce)
{
if (ce.Value is Microsoft.Scripting.Generation.CompilerConstant)
{
var cc = (Microsoft.Scripting.Generation.CompilerConstant)ce.Value;
return cc.Create();
}
return ce.Value;
}
public MyConstantExpression(ConstantExpression expression)
{
_expression = expression;
}
// ConstantExpression
protected internal virtual bool Walk(ConstantExpression node) { return true; }
protected override Expression VisitConstant(ConstantExpression constantExpression)
=> constantExpression.Type.GetTypeInfo().IsGenericType &&
constantExpression.Type.GetGenericTypeDefinition() == typeof(EntityQueryable <>)
? VisitEntityQueryable(((IQueryable)constantExpression.Value).ElementType)
: constantExpression;
public void CanFindItems(object value, int blockSize)
{
ConstantExpression[] values = new ConstantExpression[blockSize];
for (int i = 0; i != values.Length; ++i)
values[i] = Expression.Constant(value);
BlockExpression block = Expression.Block(SingleParameter, values);
IList<Expression> expressions = block.Expressions;
for (int i = 0; i != values.Length; ++i)
Assert.Equal(i, expressions.IndexOf(values[i]));
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
protected override Expression VisitConstant(ConstantExpression constantExpression)
{
Check.NotNull(constantExpression, nameof(constantExpression));
return(new SqlConstantExpression(constantExpression, null));
}
// ConstantExpression
public override bool Walk(ConstantExpression node) { return false; }
/// <summary>
/// Visits a ConstantExpression.
/// </summary>
/// <param name="node">The ConstantExpression.</param>
/// <returns>The result of visiting the Expression.</returns>
protected virtual T VisitConstant(ConstantExpression node)
{
return(default(T));
}
// ConstantExpression
public virtual bool Walk(ConstantExpression node) { return true; }
protected override Expression VisitConstant(ConstantExpression node)
{
_rootNode = new TreeNode(node.ToString());
return(node);
}
private void EmitConstantExpression(Expression expr)
{
ConstantExpression node = (ConstantExpression)expr;
EmitConstant(node.Value, node.Type);
}
public ConstantExpressionProxy(ConstantExpression node) {
_node = node;
}
public override bool Walk(ConstantExpression node)
{
AddTagIfNecessary(_ast.GetLineEndFromPosition(node.StartIndex), node.EndIndex);
return(base.Walk(node));
}
public override bool Walk(ConstantExpression node)
{
node.Parent = _currentScope;
return base.Walk(node);
}
private static bool CompareConstant(ConstantExpression a, ConstantExpression b) => Equals(a.Value, b.Value);
protected override Expression VisitConstant(ConstantExpression node)
{
return Expression.Constant(node.Value, node.Type); // clones
}
protected abstract T GetResultFromConstant(ConstantExpression node);
protected internal virtual void PostWalk(ConstantExpression node) { }
protected sealed override Expression VisitConstant(ConstantExpression node)
{
Result = resultVisitor.GetResultFromConstant(node);
return(node);
}
public void ExpressionsEnumerable(object value, int blockSize)
{
ConstantExpression[] values = new ConstantExpression[blockSize];
for (int i = 0; i != values.Length; ++i)
values[i] = Expression.Constant(value);
BlockExpression block = Expression.Block(SingleParameter, values);
Assert.True(values.SequenceEqual(block.Expressions));
int index = 0;
foreach (Expression exp in ((IEnumerable)block.Expressions))
Assert.Same(exp, values[index++]);
}
protected override Expression VisitConstant(ConstantExpression node)
{
_filter.Append(ConvertSqlLiteral(node.Value, node.Type));
return(node);
}
public override void PostWalk(ConstantExpression node) { }
internal virtual Expression VisitConstant(ConstantExpression c)
{
return(c);
}
public virtual void PostWalk(ConstantExpression node) { }
protected override Expression VisitConstant(ConstantExpression node)
{
return(node.Value == _originalQueryable ? _replacementQueryable : node);
}