internal static IQueryable GetSubGroupsAndCountsQueryable(this IQueryable queryable, string subGroupBy, bool sortGroupBy, ListSortDirection direction)
{
// Create GroupBy
Type queryableElementType = queryable.ElementType;
ParameterExpression[] parameters = new ParameterExpression[] { Expression.Parameter(queryableElementType, "") };
MemberExpression memberExpression = QueryableExtensions.GenerateMemberExpression(parameters[0], subGroupBy);
LambdaExpression groupByLambdaExpression = Expression.Lambda(memberExpression, parameters);
MethodCallExpression groupByMethodExpression =
Expression.Call(
typeof(Queryable), "GroupBy",
new Type[] { queryableElementType, groupByLambdaExpression.Body.Type },
new Expression[] { queryable.Expression, Expression.Quote(groupByLambdaExpression) });
IQueryable groupedResult = queryable.Provider.CreateQuery(groupByMethodExpression);
if (sortGroupBy)
{
groupedResult = groupedResult.OrderByKey(direction == ListSortDirection.Ascending);
}
ParameterExpression[] groupedParameters = new ParameterExpression[] { System.Linq.Expressions.Expression.Parameter(groupedResult.ElementType, "") };
MemberExpression keyMemberExpression = MemberExpression.Property(groupedParameters[0], "Key");
MethodCallExpression countCallExpression = MethodCallExpression.Call(typeof(Enumerable), "Count", new Type[] { queryableElementType }, groupedParameters);
QueryableGroupNameCountPairInfo queryableGroupNameCountPairInfo =
QueryableExtensions.QueryableGroupNameCountPairInfos.GetInfosForType(memberExpression.Type);
Expression[] newExpressionArguments = new Expression[2] {
keyMemberExpression, countCallExpression
};
NewExpression newExpression =
NewExpression.New(
queryableGroupNameCountPairInfo.ConstructorInfo,
newExpressionArguments,
new MemberInfo[] { queryableGroupNameCountPairInfo.KeyPropertyInfo, queryableGroupNameCountPairInfo.CountPropertyInfo });
LambdaExpression finalLambdaExpression = System.Linq.Expressions.Expression.Lambda(newExpression, groupedParameters);
MethodCallExpression finalSelectExpression =
System.Linq.Expressions.Expression.Call(
typeof(Queryable), "Select",
new Type[] { groupedResult.ElementType, finalLambdaExpression.Body.Type },
new System.Linq.Expressions.Expression[] { groupedResult.Expression, System.Linq.Expressions.Expression.Quote(finalLambdaExpression) });
return(groupedResult.Provider.CreateQuery(finalSelectExpression));
}
public void MakeSerializable_SerializableType_WithInitializations()
{
StubFilterWithNoSerializedFields();
var initMethod = CreateInitializationMethod(_serializableProxy);
_enabler.MakeSerializable(_serializableProxy, initMethod);
Assert.That(_serializableProxy.AddedInterfaces, Is.EqualTo(new[] { typeof(IDeserializationCallback) }));
Assert.That(_serializableProxy.AddedMethods, Has.Count.EqualTo(1));
var method = _serializableProxy.AddedMethods.Single();
Assert.That(method.Name, Is.EqualTo("System.Runtime.Serialization.IDeserializationCallback.OnDeserialization"));
Assert.That(method.GetParameters().Select(p => p.ParameterType), Is.EqualTo(new[] { typeof(object) }));
var expectedBody = MethodCallExpression.Call(
new ThisExpression(_serializableProxy), initMethod, Expression.Constant(InitializationSemantics.Deserialization));
ExpressionTreeComparer.CheckAreEqualTrees(expectedBody, method.Body);
}
private Expression GetExpressionForNodeType(
BinaryExpression expression, MethodCallExpression leftSideAsMethodCallExpression, ConstantExpression leftSideArgument2AsConstantExpression)
{
BinaryExpression binaryExpression;
switch (expression.NodeType)
{
case ExpressionType.Equal:
binaryExpression = Expression.Equal(leftSideAsMethodCallExpression.Arguments[0], leftSideAsMethodCallExpression.Arguments[1]);
return(new VBStringComparisonExpression(binaryExpression, (bool)leftSideArgument2AsConstantExpression.Value));
case ExpressionType.NotEqual:
binaryExpression = Expression.NotEqual(leftSideAsMethodCallExpression.Arguments[0], leftSideAsMethodCallExpression.Arguments[1]);
return(new VBStringComparisonExpression(binaryExpression, (bool)leftSideArgument2AsConstantExpression.Value));
}
var methodCallExpression = MethodCallExpression.Call(
leftSideAsMethodCallExpression.Arguments[0],
s_stringCompareToMethod,
new[] { leftSideAsMethodCallExpression.Arguments[1] });
var vbExpression = new VBStringComparisonExpression(methodCallExpression, (bool)leftSideArgument2AsConstantExpression.Value);
if (expression.NodeType == ExpressionType.GreaterThan)
{
return(Expression.GreaterThan(vbExpression, Expression.Constant(0)));
}
else if (expression.NodeType == ExpressionType.GreaterThanOrEqual)
{
return(Expression.GreaterThanOrEqual(vbExpression, Expression.Constant(0)));
}
else if (expression.NodeType == ExpressionType.LessThan)
{
return(Expression.LessThan(vbExpression, Expression.Constant(0)));
}
else if (expression.NodeType == ExpressionType.LessThanOrEqual)
{
return(Expression.LessThanOrEqual(vbExpression, Expression.Constant(0)));
}
throw new NotSupportedException(
string.Format("Binary expression with node type '{0}' is not supported in a VB string comparison.", expression.NodeType));
}
/// <summary>
/// Checks if the binary expression is a string comparison emitted by the Visual Basic compiler.
/// </summary>
/// <remarks>The VB compiler translates string comparisons such as
/// <code>(Function(x) x.Name = "a string value")</code> not as a binary expression with the field
/// on the left side and the string value on the right side. Instead, it converts it into a call
/// to <code>Microsoft.VisualBasic.CompilerServices.Operators.CompareString</code> (or
/// <code>Microsoft.VisualBasic.CompilerServices.EmbeddedOperators</code> for phone platforms)
/// for the string value, and compares the expression to zero.</remarks>
/// <param name="expression">The binary expression to check.</param>
/// <param name="stringComparison">A normalized string comparison expression.</param>
/// <returns>True if the expression is a string comparison expression emitted by the VB compiler,
/// otherwise false</returns>
private bool CheckVBStringCompareExpression(BinaryExpression expression, out BinaryExpression stringComparison)
{
stringComparison = null;
if (expression.Left.Type == typeofInt &&
expression.Left.NodeType == ExpressionType.Call &&
expression.Right.Type == typeofInt &&
expression.Right.NodeType == ExpressionType.Constant &&
((ConstantExpression)expression.Right).Value.Equals(0))
{
MethodCallExpression methodCall = (MethodCallExpression)expression.Left;
if ((methodCall.Method.DeclaringType.FullName == VBOperatorClass || methodCall.Method.DeclaringType.FullName == VBOperatorClassAlt) &&
methodCall.Method.Name == VBCompareStringMethod &&
methodCall.Arguments.Count == VBCompareStringArguments &&
methodCall.Arguments[VBCaseSensitiveCompareArgumentIndex].Type == typeof(bool) &&
methodCall.Arguments[VBCaseSensitiveCompareArgumentIndex].NodeType == ExpressionType.Constant)
{
bool doCaseInsensitiveComparison = ((ConstantExpression)methodCall.Arguments[VBCaseSensitiveCompareArgumentIndex]).Value.Equals(true);
Expression leftExpression = methodCall.Arguments[0];
Expression rightExpression = methodCall.Arguments[1];
if (doCaseInsensitiveComparison)
{
leftExpression = MethodCallExpression.Call(leftExpression, stringToLowerMethod);
rightExpression = MethodCallExpression.Call(rightExpression, stringToLowerMethod);
}
switch (expression.NodeType)
{
case ExpressionType.Equal:
stringComparison = BinaryExpression.Equal(leftExpression, rightExpression);
break;
case ExpressionType.NotEqual:
stringComparison = BinaryExpression.NotEqual(leftExpression, rightExpression);
break;
case ExpressionType.LessThan:
stringComparison = BinaryExpression.LessThan(leftExpression, rightExpression);
break;
case ExpressionType.LessThanOrEqual:
stringComparison = BinaryExpression.LessThanOrEqual(leftExpression, rightExpression);
break;
case ExpressionType.GreaterThan:
stringComparison = BinaryExpression.GreaterThan(leftExpression, rightExpression);
break;
case ExpressionType.GreaterThanOrEqual:
stringComparison = BinaryExpression.GreaterThanOrEqual(leftExpression, rightExpression);
break;
}
if (stringComparison != null)
{
return(true);
}
}
}
return(false);
}
