/// <summary>
/// 解决 对象 到 类似 ICollection<KeyValuePair<TKey,TValue>> 类型的转换。
/// </summary>
/// <typeparam name="TResult">目标类型。</typeparam>
/// <param name="sourceType">源类型。</param>
/// <param name="conversionType">目标类型。</param>
/// <param name="typeArgument">泛型【KeyValuePair<TKey,TValue>】约束。</param>
/// <param name="typeArguments">泛型【TKey,TValue】约束。</param>
/// <returns></returns>
protected override Func <object, TResult> ByObjectToICollectionKeyValuePair <TResult>(Type sourceType, Type conversionType, Type typeArgument, Type[] typeArguments)
{
var typeStore = TypeItem.Get(sourceType);
var list = new List <Expression>();
var listKvType = typeof(List <>).MakeGenericType(typeArgument);
var resultExp = Variable(listKvType);
var targetExp = Variable(sourceType);
var sourceExp = Parameter(typeof(object));
var method = listKvType.GetMethod("Add", new Type[] { typeArgument });
list.Add(Assign(targetExp, Convert(sourceExp, sourceType)));
var methodCtor = ServiceCtor.Method;
var bodyExp = methodCtor.IsStatic ?
Call(null, methodCtor, Constant(listKvType)) :
Call(Constant(ServiceCtor.Target), methodCtor, Constant(listKvType));
list.Add(Assign(resultExp, Convert(bodyExp, listKvType)));
var typeStore2 = TypeItem.Get(typeArgument);
var ctorSotre = typeStore2.ConstructorStores.Where(x => x.ParameterStores.Count == 2).First();
if (Kind == PatternKind.Property || Kind == PatternKind.All)
{
typeStore.PropertyStores
.Where(x => x.CanRead)
.ForEach(info =>
{
list.Add(Call(resultExp, method, New(ctorSotre.Member, ConvertTo(Constant(info.Naming), typeArguments[0]), ConvertTo(Property(targetExp, info.Member), typeArguments[1]))));
});
}
if (Kind == PatternKind.Field || Kind == PatternKind.All)
{
typeStore.FieldStores
.Where(x => x.CanRead)
.ForEach(info =>
{
list.Add(Call(resultExp, method, New(ctorSotre.Member, ConvertTo(Constant(info.Naming), typeArguments[0]), ConvertTo(Field(targetExp, info.Member), typeArguments[1]))));
});
}
list.Add(Convert(resultExp, conversionType));
var lamdaExp = Lambda <Func <object, TResult> >(Block(new[] { targetExp, resultExp }, list), sourceExp);
return(lamdaExp.Compile());
}
/// <summary>
/// 解决 IEnumarable<T> 到 泛型约束类的转换。
/// </summary>
/// <typeparam name="TResult">目标类型。</typeparam>
/// <param name="sourceType">源类型。</param>
/// <param name="conversionType">目标类型。</param>
/// <param name="interfaceType">接口类型。</param>
/// <param name="typeArguments">方向约束。</param>
/// <returns></returns>
protected virtual Func <object, TResult> ByEnumarableKeyValuePairToObject <TResult>(Type sourceType, Type conversionType, Type interfaceType, Type[] typeArguments)
{
var typeStore = TypeItem.Get(conversionType);
if (typeStore.ConstructorStores.Any(x => x.ParameterStores.Count == 0))
{
return(ByEnumarableKeyValuePairToCommon <TResult>(typeStore, sourceType, conversionType, interfaceType, typeArguments));
}
return(ByEnumarableKeyValuePairToComplex <TResult>(typeStore, sourceType, conversionType, interfaceType, typeArguments));
}
/// <summary>
/// 解决 对象 到类似 IDictionary<TKey,TValue> 的转换。
/// </summary>
/// <typeparam name="TResult">目标类型。</typeparam>
/// <param name="sourceType">源类型。</param>
/// <param name="conversionType">目标类型。</param>
/// <param name="typeArguments">泛型【TKey,TValue】约束。</param>
/// <returns></returns>
protected override Func <object, TResult> ByObjectToDictionaryLike <TResult>(Type sourceType, Type conversionType, Type[] typeArguments)
{
var typeStore = TypeItem.Get(sourceType);
var list = new List <Expression>();
var resultExp = Variable(conversionType);
var targetExp = Variable(sourceType);
var sourceExp = Parameter(typeof(object));
var method = conversionType.GetMethod("Add", typeArguments);
list.Add(Assign(targetExp, Convert(sourceExp, sourceType)));
var methodCtor = ServiceCtor.Method;
var bodyExp = methodCtor.IsStatic ?
Call(null, methodCtor, Constant(conversionType)) :
Call(Constant(ServiceCtor.Target), methodCtor, Constant(conversionType));
list.Add(Assign(resultExp, Convert(bodyExp, conversionType)));
if (Kind == PatternKind.Property || Kind == PatternKind.All)
{
typeStore.PropertyStores
.Where(x => x.CanRead)
.ForEach(info =>
{
list.Add(Call(resultExp, method, ConvertTo(Constant(info.Naming), typeArguments[0]), ConvertTo(Property(targetExp, info.Member), typeArguments[1])));
});
}
if (Kind == PatternKind.Field || Kind == PatternKind.All)
{
typeStore.FieldStores
.Where(x => x.CanRead)
.ForEach(info =>
{
list.Add(Call(resultExp, method, ConvertTo(Constant(info.Naming), typeArguments[0]), ConvertTo(Field(targetExp, info.Member), typeArguments[1])));
});
}
list.Add(resultExp);
var lamdaExp = Lambda <Func <object, TResult> >(Block(new[] { targetExp, resultExp }, list), sourceExp);
return(lamdaExp.Compile());
}
/// <summary>
/// 映射查询（生成“<typeparamref name="TResult"/>”类型的查询表达式）。
/// 注：名称相同（支持<see cref="NamingAttribute"/>比较），且可读写的属性映射。如：x => new YueClass { Id = x.Id, Name = x.Name }。
/// </summary>
/// <typeparam name="TResult">查询结果。</typeparam>
/// <param name="source">数据源。</param>
/// <returns></returns>
public static IQueryable <TResult> Map <TResult>(this IQueryable source) where TResult : class, new()
{
if (source is IQueryable <TResult> queryable)
{
return(queryable);
}
var conversionType = typeof(TResult);
var elementType = source.ElementType;
return(source.Provider.CreateQuery <TResult>(Expressions.GetOrAdd(((long)elementType.MetadataToken << 31) + conversionType.MetadataToken, _ =>
{
var typeItem = TypeItem.Get(conversionType);
var typeItem2 = TypeItem.Get(elementType);
var parameterExp = Parameter(elementType, "x");
var list = new List <MemberBinding>();
typeItem.PropertyStores
.Where(x => x.CanWrite && x.CanRead)
.ForEach(x =>
{
var propItem = typeItem2.PropertyStores
.FirstOrDefault(y => y.Name == x.Name && y.MemberType == x.MemberType && y.CanRead) ?? typeItem2
.PropertyStores.FirstOrDefault(y => y.MemberType == x.MemberType && y.CanRead && y.Naming == x.Naming) ?? typeItem2
.PropertyStores.FirstOrDefault(y => y.MemberType == x.MemberType && y.CanRead && y.Name == x.Naming) ?? typeItem2
.PropertyStores.FirstOrDefault(y => y.MemberType == x.MemberType && y.CanRead && y.Naming == x.Name);
if (propItem is null || propItem.Ignore)
{
return;
}
list.Add(Bind(x.Member, Property(parameterExp, propItem.Member)));
});
var memberInit = MemberInit(New(typeItem.Type), list);
var lambdaEx = Lambda(memberInit, parameterExp);
return Call(SelectMethod.MakeGenericMethod(elementType, conversionType), new Expression[2] {
source.Expression,
lambdaEx
});
})));
public static void Register(HttpConfiguration config)
{
// Web API 配置和服务
// Web API 路由
config.MapHttpAttributeRoutes();
var typeStore = TypeItem.Get(config.GetType());
var propertyStore = typeStore.PropertyStores.First(x => x.Name == "Services");
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
}
public string[] Where <TColumn>(Expression <Func <TEntity, TColumn> > lamda)
{
if (lamda is null)
{
throw new ArgumentNullException(nameof(lamda));
}
var parameter = lamda.Parameters[0];
var body = lamda.Body;
switch (body.NodeType)
{
case ExpressionType.Constant when body is ConstantExpression constant:
switch (constant.Value)
{
case string text:
return(text.Split(',', ' '));
case string[] arr:
return(arr);
default:
throw new NotImplementedException();
}
case ExpressionType.MemberAccess when body is MemberExpression member:
return(new string[] { member.Member.Name });
case ExpressionType.MemberInit when body is MemberInitExpression memberInit:
return(memberInit.Bindings.Select(x => x.Member.Name).ToArray());
case ExpressionType.New when body is NewExpression newExpression:
return(newExpression.Members.Select(x => x.Name).ToArray());
case ExpressionType.Parameter:
var storeItem = TypeItem.Get(parameter.Type);
return(storeItem.PropertyStores
.Where(x => x.CanRead)
.Select(x => x.Name)
.ToArray());
default:
throw new NotSupportedException($"不支持表达式({lamda})!");
}
}
/// <summary>
/// 获取枚举描述。
/// </summary>
/// <typeparam name="TEnum">枚举类型。</typeparam>
/// <param name="enum">枚举值。</param>
/// <exception cref="ArgumentException">参数不是枚举类型。</exception>
/// <returns></returns>
public static string GetText <TEnum>(this TEnum @enum) where TEnum : struct
{
var type = typeof(TEnum);
if (!type.IsEnum)
{
throw new ArgumentException("参数类型不是枚举!");
}
var typeStore = TypeItem.Get <TEnum>();
string enumStr = @enum.ToString();
if (typeStore.IsDefined <FlagsAttribute>())
{
var values = enumStr.Split(',').Select(x => x.Trim());
if (!values.All(x => typeStore.FieldStores.Any(y => string.Equals(y.Name, x, StringComparison.InvariantCultureIgnoreCase))))
{
return("N/A");
}
return(string.Join("|", typeStore.FieldStores
.Where(x => values.Any(y => string.Equals(y, x.Name, StringComparison.InvariantCultureIgnoreCase)))
.Select(x =>
{
var desc2 = x.GetCustomAttribute <DescriptionAttribute>();
return desc2 is null ? x.Name : desc2.Description;
})));
}
var field = typeStore.FieldStores.FirstOrDefault(x => x.Name == enumStr);
if (field is null)
{
return("N/A");
}
var desc = field.GetCustomAttribute <DescriptionAttribute>();
return(desc is null ? field.Name : desc.Description);
}
/// <summary>
/// 静态构造函数。
/// </summary>
static AdapterFormatter()
{
var contextType = typeof(T);
var typeStore = TypeItem.Get(contextType);
var matchType = typeof(Match);
var groupType = typeof(Group);
var contextExp = Parameter(contextType, "context");
var parameterExp = Parameter(matchType, "item");
var getGroupMethod = GetMethodInfo(GetGroup);
var checkGroupMethod = GetMethodInfo(CheckGroup);
typeStore.MethodStores
.Where(x => x.IsPublic && !x.IsStatic && x.Member.DeclaringType == contextType && x.Member.ReturnType == typeof(string) && x.ParameterStores.Count > 0)
.OrderByDescending(x => x.ParameterStores.Count)
.ForEach(x =>
{
if (!x.ParameterStores.All(y => y.ParameterType == matchType || y.ParameterType == groupType || y.ParameterType == typeof(string) || y.ParameterType == typeof(bool)))
{
throw new NotSupportedException("仅支持类型System.Text.RegularExpressions.Match、System.Text.RegularExpressions.Group、System.String、System.Boolean类型的映射。");
}
var conditions = new List <Expression>();
var variables = new List <ParameterExpression>();
var arguments = new List <Expression>();
var expressions = new List <Expression>();
x.ParameterStores.ForEach(y =>
{
if (y.ParameterType == matchType)
{
arguments.Add(parameterExp);
}
else
{
var groupExp = Variable(groupType, y.Name);
variables.Add(groupExp);
expressions.Add(Assign(groupExp, Call(null, getGroupMethod, parameterExp, Constant(y.Name))));
if (y.ParameterType == groupType)
{
conditions.Add(Property(groupExp, "Success"));
arguments.Add(groupExp);
}
else
{
if (y.ParameterType == typeof(bool))
{
arguments.Add(Property(groupExp, "Success"));
}
else
{
arguments.Add(Property(groupExp, "Value"));
conditions.Add(Call(null, checkGroupMethod, groupExp));
}
}
}
});
var adapter = new Adapter();
var enumerator = conditions.GetEnumerator();
if (enumerator.MoveNext())
{
var condition = enumerator.Current;
while (enumerator.MoveNext())
{
condition = AndAlso(condition, enumerator.Current);
}
var invoke = Lambda <Func <Match, bool> >(Block(variables, expressions.Concat(new Expression[1] {
condition
})), parameterExp);
adapter.CanConvert = invoke.Compile();
}
expressions.Add(Call(contextExp, x.Member, arguments));
var lamdaExp = Lambda <Func <T, Match, string> >(Block(variables, expressions), contextExp, parameterExp);
adapter.Convert = lamdaExp.Compile();
AdapterCache.Add(adapter);
});
}
/// <inheritdoc />
protected override void VisitCore(MethodCallExpression node)
{
string name = node.Method.Name;
if (isNoPackage)
{
switch (name)
{
case MethodCall.TimeOut:
case MethodCall.From:
case MethodCall.Any:
case MethodCall.All:
case MethodCall.Contains:
case MethodCall.Union:
case MethodCall.Concat:
case MethodCall.Except:
case MethodCall.Intersect:
break;
default:
isNoPackage = false;
break;
}
}
switch (name)
{
case MethodCall.ElementAt:
case MethodCall.ElementAtOrDefault:
base.Visit(node.Arguments[0]);
int index = (int)node.Arguments[1].GetValueFromExpression();
if (index < 0)
{
throw new IndexOutOfRangeException();
}
if (this.take > 0 && index < this.take)
{
throw new IndexOutOfRangeException();
}
this.take = 1;
this.skip += index;
break;
case MethodCall.Take:
case MethodCall.TakeLast:
if (useAggregation)
{
throw new DSyntaxErrorException($"使用聚合函数时，禁止使用分页函数({name})!");
}
if (name == MethodCall.TakeLast)
{
reverseOrder ^= true;
}
int take = (int)node.Arguments[1].GetValueFromExpression();
if (take < 1)
{
throw new ArgumentOutOfRangeException($"使用{name}函数,参数值必须大于零!");
}
if (this.take > 0 && take < this.take)
{
throw new IndexOutOfRangeException();
}
if (this.skip > -1)
{
if (this.skip > take)
{
throw new IndexOutOfRangeException();
}
take -= this.skip;
}
if (this.take == -1)
{
this.take = take;
}
base.Visit(node.Arguments[0]);
if (!useOrderBy && name == MethodCall.TakeLast)
{
throw new DSyntaxErrorException($"使用函数({name})时，必须使用排序函数(OrderBy/OrderByDescending)!");
}
break;
case MethodCall.First:
case MethodCall.FirstOrDefault:
case MethodCall.Single:
case MethodCall.SingleOrDefault:
// TOP(1)
this.take = 1;
if (node.Arguments.Count > 1)
{
VisitCondition(node);
}
else
{
Visit(node.Arguments[0]);
}
break;
case MethodCall.Last:
case MethodCall.LastOrDefault:
// TOP(..)
this.take = 1;
reverseOrder ^= true;
if (node.Arguments.Count > 1)
{
VisitCondition(node);
}
else
{
base.Visit(node.Arguments[0]);
}
if (!useOrderBy)
{
throw new DSyntaxErrorException($"使用函数({name})时，必须使用排序函数(OrderBy/OrderByDescending)!");
}
break;
case MethodCall.Max:
buildSelect = false;
buildedSelect = true;
useAggregation = true;
using (var visitor = new MaxVisitor(this))
{
visitor.Startup(node);
}
break;
case MethodCall.Min:
buildSelect = false;
buildedSelect = true;
useAggregation = true;
using (var visitor = new MinVisitor(this))
{
visitor.Startup(node);
}
break;
case MethodCall.Sum:
buildSelect = false;
buildedSelect = true;
useAggregation = true;
using (var visitor = new SumVisitor(this))
{
visitor.Startup(node);
}
break;
case MethodCall.Average:
buildSelect = false;
buildedSelect = true;
useAggregation = true;
using (var visitor = new AverageVisitor(this))
{
visitor.Startup(node);
}
break;
case MethodCall.Count:
case MethodCall.LongCount:
useCount = true;
buildSelect = false;
buildedSelect = true;
useAggregation = true;
using (var visitor = new CountVisitor(this))
{
visitor.Startup(node);
}
break;
case MethodCall.Skip:
case MethodCall.SkipLast:
if (useAggregation)
{
throw new DSyntaxErrorException($"使用聚合函数时，禁止使用分页函数({name})!");
}
if (name == MethodCall.SkipLast)
{
reverseOrder ^= true;
}
int skip = (int)node.Arguments[1].GetValueFromExpression();
if (skip < 0)
{
throw new ArgumentOutOfRangeException($"使用({name})函数,参数值不能小于零!");
}
if (this.skip == -1)
{
this.skip = skip;
}
else
{
this.skip += skip;
}
base.Visit(node.Arguments[0]);
if (!useOrderBy && name == MethodCall.SkipLast)
{
throw new DSyntaxErrorException($"使用函数({name})时，必须使用排序函数(OrderBy/OrderByDescending)!");
}
break;
case MethodCall.Reverse:
reverseOrder ^= true;
base.Visit(node.Arguments[0]);
if (!useOrderBy)
{
throw new DSyntaxErrorException($"使用函数“{name}”时，必须使用排序函数(OrderBy/OrderByDescending)!");
}
break;
case MethodCall.GroupBy:
case MethodCall.Where when node.Arguments[0].Type.IsGroupingQueryable():
case MethodCall.TakeWhile when node.Arguments[0].Type.IsGroupingQueryable():
case MethodCall.SkipWhile when node.Arguments[0].Type.IsGroupingQueryable():
if (name == MethodCall.GroupBy)
{
castCache.Add(node.Type.GetGenericArguments().First(), TypeToEntryType(node.Arguments[0].Type));
}
if (!useGroupBy)
{
byVisitor = new GroupByVisitor(this, defaultCache, groupByExpressions);
}
useGroupBy = true;
byVisitor.Startup(node);
break;
case MethodCall.Select:
if (useCount)
{
base.Visit(node.Arguments[0]);
break;
}
if (!buildSelect)
{
throw new DSyntaxErrorException($"请将函数“{name}”置于查询最后一个包含入参的函数之后!");
}
buildSelect = buildFrom = false;
writer.Select();
Workflow(() =>
{
buildedSelect = true;
if (isDistinct)
{
writer.Distinct();
}
inSelect = true;
Visit(node.Arguments[1]);
inSelect = false;
writer.From();
if (!hasJoin && !hasCombination)
{
WriteTableName(node.Arguments[0].Type);
}
}, () => base.Visit(node.Arguments[0]));
break;
case MethodCall.SelectMany when node.Arguments.Count == 3:
hasJoin = true;
var parameterExp = Join(node.Arguments[2], true);
bool DoneLeftJoin(ParameterExpression parameter, Expression expression)
{
if (expression.NodeType == ExpressionType.MemberAccess)
{
return(false);
}
switch (expression)
{
case UnaryExpression unary:
return(DoneLeftJoin(parameter, unary.Operand));
case LambdaExpression lambda when lambda.Parameters.Count == 1:
return(DoneLeftJoin(parameter, lambda.Body));
case MethodCallExpression methodCall when methodCall.Method.Name == MethodCall.DefaultIfEmpty:
if (methodCall.Arguments.Count > 1)
{
defaultCache.Add(Tuple.Create(parameter.Type, parameter.Name), methodCall.Arguments[1]);
}
return(true);
default:
throw new DSyntaxErrorException();
}
}
using (var visitor = new GroupJoinVisitor(this, parameterExp, DoneLeftJoin(parameterExp, node.Arguments[1])))
{
visitor.Startup(node.Arguments[0]);
}
buildTable = false;
break;
case MethodCall.Distinct:
if (buildedSelect)
{
throw new DSyntaxErrorException($"函数“{name}”未生效！");
}
isDistinct = true;
base.Visit(node.Arguments[0]);
break;
case MethodCall.Cast:
case MethodCall.OfType:
Type type = node.Type
.GetGenericArguments()
.First();
if (type.IsValueType || type == typeof(string) || typeof(IEnumerable).IsAssignableFrom(type))
{
throw new TypeAccessInvalidException($"“{node.Method.Name}”函数泛型参数类型不能是值类型、字符串类型或迭代类型!");
}
var objExp = node.Arguments[0];
var originalType = objExp.Type;
if (node.Type == originalType)
{
base.Visit(objExp);
break;
}
useCast = true;
if (!castCache.ContainsKey(type))
{
castCache.Add(type, TypeToEntryType(originalType));
}
var entry = TypeItem.Get(type);
if (memberFilters.Count == 0)
{
memberFilters.AddRange(entry.PropertyStores
.Where(x => x.CanRead && x.CanWrite)
.Select(x => x.Name.ToLower()));
}
else //? 取交集
{
memberFilters = memberFilters
.Intersect(entry.PropertyStores
.Where(x => x.CanRead && x.CanWrite)
.Select(x => x.Name.ToLower()))
.ToList();
}
if (memberFilters.Count == 0)
{
throw new DException("未指定查询字段!");
}
base.Visit(objExp);
break;
case MethodCall.OrderBy:
case MethodCall.ThenBy:
case MethodCall.OrderByDescending:
case MethodCall.ThenByDescending:
useOrderBy = true;
if (useAggregation)
{
base.Visit(node.Arguments[0]);
break;
}
bool thatReverseOrder = reverseOrder;
Workflow(() => writer.UsingSort(() =>
{
orderBySwitch.OrderBy();
base.Visit(node.Arguments[1]);
if (thatReverseOrder ^ node.Method.Name.EndsWith("Descending"))
{
writer.Descending();
}
}), () => base.Visit(node.Arguments[0]));
break;
case MethodCall.Join:
hasJoin = true;
Join(node.Arguments[2], false);
Join(node.Arguments[3], true);
using (var visitor = new JoinVisitor(this))
{
visitor.Startup(node);
}
buildTable = false;
break;
case MethodCall.Any:
isExists = true;
using (var visitor = new AnyVisitor(this))
{
visitor.Startup(node);
}
break;
case MethodCall.All:
isExists = true;
using (var visitor = new AllVisitor(this))
{
visitor.Startup(node);
}
break;
case MethodCall.Union:
case MethodCall.Concat:
case MethodCall.Except:
case MethodCall.Intersect:
buildTable = buildFrom = false;
hasCombination = true;
if (isNoPackage)
{
buildSelect = false;
buildedSelect = true;
using (var visitor = new CombinationVisitor(this))
{
visitor.Startup(node);
}
break;
}
string prefix = "x";
if (buildSelect)
{
buildSelect = false;
var tableInfo = MakeTableInfo(node.Arguments[0].Type);
Workflow(() =>
{
buildedSelect = true;
writer.Select();
if (isDistinct)
{
writer.Distinct();
}
WriteMembers(prefix, FilterMembers(tableInfo.ReadOrWrites));
}, Done);
break;
}
Done();
break;
void Done()
{
writer.From();
writer.OpenBrace();
using (var visitor = new CombinationVisitor(this))
{
visitor.Startup(node);
}
writer.CloseBrace();
writer.WhiteSpace();
writer.Name(prefix = GetEntryAlias(node.Arguments[0].Type, "x"));
}
default:
base.VisitCore(node);
break;
}
ParameterExpression Join(Expression expression, bool isJoin)
{
switch (expression)
{
case UnaryExpression unary:
return(Join(unary.Operand, isJoin));
case LambdaExpression lambda when lambda.Parameters.Count == 1 || lambda.Parameters.Count == 2:
#if NETSTANDARD2_1_OR_GREATER
var parameter = lambda.Parameters[^ 1];