public void MemberInitExpressionForDerivedTypeCanBeUsedWithPropertyTypedAsBaseType()
{
Expression <Func <Cook, Result <BaseValue> > > lambaExpression =
c => new Result <BaseValue> {
Value = new DerivedValue {
StringValue = c.FirstName
}
};
// new Result { ... }
var resultInitExpression = ((MemberInitExpression)lambaExpression.Body);
// BaseValue = new DerivedValue { ... }
var derivedValueMemberAssignment = ((MemberAssignment)resultInitExpression.Bindings[0]);
// new DerivedValue { ... }
var derivedValueInitExpression = (MemberInitExpression)(derivedValueMemberAssignment.Expression);
// StringValue = c.FirstName
var derivedValueStringValueMemberAssignment = ((MemberAssignment)derivedValueInitExpression.Bindings[0]);
// c.FirstName
var derivedValueStringValuePropertyExpression = (MemberExpression)derivedValueStringValueMemberAssignment.Expression;
var inputParameter = Expression.Parameter(typeof(Result <BaseValue>), "input");
var result = AccessorFindingExpressionVisitor.FindAccessorLambda(
searchedExpression: derivedValueStringValuePropertyExpression,
fullExpression: resultInitExpression,
inputParameter: inputParameter);
Expression <Func <Result <BaseValue>, string> > expectedResult = input => ((DerivedValue)input.Value).StringValue;
ExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
}
public void NewExpressionForAnonymousType()
{
Expression <Func <Cook, dynamic> > lambaExpression = c => new { OuterValue = new { InnerValue = c.FirstName } };
// new OuterType (...)
var resultInitExpression = ((NewExpression)lambaExpression.Body);
// new InnerType (...)
var derivedValueInitExpression = (NewExpression)resultInitExpression.Arguments[0];
// c.FirstName
var derivedValueStringValuePropertyExpression = (MemberExpression)derivedValueInitExpression.Arguments[0];
var inputParameter = Expression.Parameter(resultInitExpression.Type, "input");
var result = AccessorFindingExpressionVisitor.FindAccessorLambda(
searchedExpression: derivedValueStringValuePropertyExpression,
fullExpression: resultInitExpression,
inputParameter: inputParameter);
// Expression<Func<dynamic, string>> input => input.OuterValue.InnerValue;
var expectedParameter = Expression.Parameter(resultInitExpression.Type, "input");
#if !NET_3_5
var expectedOuterProperty = Expression.Property(expectedParameter, "OuterValue");
var expectedInnerProperty = Expression.Property(expectedOuterProperty, "InnerValue");
var expectedResult = Expression.Lambda(expectedInnerProperty, expectedParameter);
#else
var expectedOuterGetter = Expression.Call(expectedParameter, "get_OuterValue", new Type[0]);
var expectedInnerGetter = Expression.Call(expectedOuterGetter, "get_InnerValue", new Type[0]);
var expectedResult = Expression.Lambda(expectedInnerGetter, expectedParameter);
#endif
ExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
}
public void NestedNewExpression()
{
var outerAnonymousTypeCtor = typeof(AnonymousType <int, AnonymousType>).GetConstructor(new[] { typeof(int), typeof(AnonymousType) });
var outerAnonymousTypeAGetter = typeof(AnonymousType <int, AnonymousType>).GetMethod("get_a");
var outerAnonymousTypeBGetter = typeof(AnonymousType <int, AnonymousType>).GetMethod("get_b");
#if !NET_3_5
var outerAnonymousTypeBProperty = typeof(AnonymousType <int, AnonymousType>).GetProperty("b");
#endif
// new AnonymousType (get_a = 2, get_b = new AnonymousType (get_a = _searchedExpression, get_b = 1))
var innerExpression = Expression.New(
_anonymousTypeCtorWithArgs,
new[] { _searchedExpression, Expression.Constant(1) },
_anonymousTypeAGetter,
_anonymousTypeBGetter);
var fullExpression = Expression.New(
outerAnonymousTypeCtor,
new Expression[] { Expression.Constant(2), innerExpression },
outerAnonymousTypeAGetter,
outerAnonymousTypeBGetter);
var result = AccessorFindingExpressionVisitor.FindAccessorLambda(_searchedExpression, fullExpression, _nestedInputParameter);
var inputParameter = Expression.Parameter(typeof(AnonymousType <int, AnonymousType>), "input");
// input => input.get_b().get_a()
var expectedResult = Expression.Lambda(
#if !NET_3_5
Expression.MakeMemberAccess(Expression.MakeMemberAccess(inputParameter, outerAnonymousTypeBProperty), _anonymousTypeAProperty),
#else
Expression.Call(Expression.Call(inputParameter, outerAnonymousTypeBGetter), _anonymousTypeAGetter),
#endif
inputParameter);
ExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
}
public void TrivialExpression()
{
var result = AccessorFindingExpressionVisitor.FindAccessorLambda(_searchedExpression, _searchedExpression, _intInputParameter);
Expression <Func <int, int> > expectedResult = input => input;
ExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
}
public void SearchedExpressionNotFound_AlthoughInOtherExpression()
{
var fullExpression = Expression.MemberInit(
Expression.New(_anonymousTypeCtorWithoutArgs),
Expression.Bind(_anonymousTypeAProperty, Expression.MakeBinary(ExpressionType.Add, _searchedExpression, _searchedExpression)),
Expression.Bind(_anonymousTypeBProperty, Expression.Constant(1)));
AccessorFindingExpressionVisitor.FindAccessorLambda(_searchedExpression, fullExpression, _simpleInputParameter);
}
public void ConvertExpression()
{
var parameter = Expression.Parameter(typeof(long), "input");
var fullExpression = Expression.Convert(_searchedExpression, typeof(long));
var result = AccessorFindingExpressionVisitor.FindAccessorLambda(_searchedExpression, fullExpression, parameter);
Expression <Func <long, int> > expectedResult = input => (int)input;
ExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
}
public void TrivialExpression_WithEqualsTrue_ButNotReferenceEquals()
{
var searchedExpression1 = new QuerySourceReferenceExpression(ExpressionHelper.CreateMainFromClause <Cook>());
var searchedExpression2 = new QuerySourceReferenceExpression(searchedExpression1.ReferencedQuerySource);
var inputParameter = Expression.Parameter(typeof(Cook), "input");
var result = AccessorFindingExpressionVisitor.FindAccessorLambda(searchedExpression1, searchedExpression2, inputParameter);
Expression <Func <Cook, Cook> > expectedResult = input => input;
ExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
}
public void SearchedExpressionNotFound_AlthoughInOtherMemberBinding()
{
var anonymousTypeListProperty = typeof(AnonymousType).GetProperty("List");
var listAddMethod = typeof(List <int>).GetMethod("Add");
var fullExpression = Expression.MemberInit(
Expression.New(_anonymousTypeCtorWithoutArgs),
Expression.ListBind(anonymousTypeListProperty, Expression.ElementInit(listAddMethod, _searchedExpression)),
Expression.Bind(_anonymousTypeBProperty, Expression.Constant(1)));
AccessorFindingExpressionVisitor.FindAccessorLambda(_searchedExpression, fullExpression, _simpleInputParameter);
}
public void SimpleMemberBindingExpression()
{
// new AnonymousType() { a = _searchedExpression, b = 1 }
var fullExpression = Expression.MemberInit(
Expression.New(_anonymousTypeCtorWithoutArgs),
Expression.Bind(_anonymousTypeAProperty, _searchedExpression),
Expression.Bind(_anonymousTypeBProperty, Expression.Constant(1)));
var result = AccessorFindingExpressionVisitor.FindAccessorLambda(_searchedExpression, fullExpression, _simpleInputParameter);
Expression <Func <AnonymousType, int> > expectedResult = input => input.a;
ExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
}
private static ICollection <Func <TResult, object> > GetEntityAccessors <TResult>(
IEnumerable <EntityTrackingInfo> entityTrackingInfos,
Expression selector)
=> (from entityTrackingInfo in entityTrackingInfos
select
(Func <TResult, object>)
AccessorFindingExpressionVisitor
.FindAccessorLambda(
entityTrackingInfo.QuerySourceReferenceExpression,
selector,
Expression.Parameter(typeof(TResult), "result"))
.Compile())
.ToList();
protected virtual void IncludeNavigations(
[NotNull] QueryModel queryModel,
[NotNull] IReadOnlyCollection <IncludeSpecification> includeSpecifications)
{
Check.NotNull(queryModel, nameof(queryModel));
Check.NotNull(includeSpecifications, nameof(includeSpecifications));
var querySourceTracingExpressionVisitor
= new QuerySourceTracingExpressionVisitor();
foreach (var includeSpecification in includeSpecifications)
{
var resultQuerySourceReferenceExpression
= querySourceTracingExpressionVisitor
.FindResultQuerySourceReferenceExpression(
queryModel.SelectClause.Selector,
includeSpecification.QuerySource);
if (resultQuerySourceReferenceExpression != null)
{
var accessorLambda
= AccessorFindingExpressionVisitor
.FindAccessorLambda(
resultQuerySourceReferenceExpression,
queryModel.SelectClause.Selector,
Expression.Parameter(queryModel.SelectClause.Selector.Type));
QueryCompilationContext.Logger
.LogInformation(
includeSpecification.NavigationPath.Join("."),
Strings.LogIncludingNavigation);
IncludeNavigations(
includeSpecification,
_expression.Type.GetSequenceType(),
accessorLambda,
QuerySourceRequiresTracking(includeSpecification.QuerySource));
QueryCompilationContext
.AddTrackableInclude(
resultQuerySourceReferenceExpression.ReferencedQuerySource,
includeSpecification.NavigationPath);
}
}
}
protected virtual void IncludeNavigations(
[NotNull] QueryModel queryModel,
[NotNull] IReadOnlyCollection <IncludeSpecification> includeSpecifications)
{
Check.NotNull(queryModel, nameof(queryModel));
Check.NotNull(includeSpecifications, nameof(includeSpecifications));
foreach (var includeSpecification in includeSpecifications)
{
var resultQuerySourceReferenceExpression
= _querySourceTracingExpressionVisitorFactory
.Create()
.FindResultQuerySourceReferenceExpression(
queryModel.SelectClause.Selector,
includeSpecification.QuerySource);
if (resultQuerySourceReferenceExpression != null)
{
var accessorLambda
= AccessorFindingExpressionVisitor
.FindAccessorLambda(
resultQuerySourceReferenceExpression,
queryModel.SelectClause.Selector,
Expression.Parameter(queryModel.SelectClause.Selector.Type, "result"));
QueryCompilationContext.Logger
.LogVerbose(
CoreLoggingEventId.IncludingNavigation,
() => CoreStrings.LogIncludingNavigation(includeSpecification.NavigationPath.Join(".")));
IncludeNavigations(
includeSpecification,
_expression.Type.GetSequenceType(),
accessorLambda,
QueryCompilationContext.IsTrackingQuery);
QueryCompilationContext
.AddTrackableInclude(
resultQuerySourceReferenceExpression.ReferencedQuerySource,
includeSpecification.NavigationPath);
}
}
}
public void SimpleNewExpression()
{
// new AnonymousType (get_a = _searchedExpression, get_b = 1)
var fullExpression = Expression.New(
_anonymousTypeCtorWithArgs,
new[] { _searchedExpression, Expression.Constant(1) },
_anonymousTypeAGetter,
_anonymousTypeBGetter);
var result = AccessorFindingExpressionVisitor.FindAccessorLambda(_searchedExpression, fullExpression, _simpleInputParameter);
var inputParameter = Expression.Parameter(typeof(AnonymousType), "input");
var expectedResult = Expression.Lambda(
#if !NET_3_5
Expression.MakeMemberAccess(inputParameter, _anonymousTypeAProperty),
#else
Expression.Call(inputParameter, _anonymousTypeAGetter),
#endif
inputParameter);
ExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
}
public void NestedMemberBindingExpression()
{
var outerAnonymousTypeCtor = typeof(AnonymousType <int, AnonymousType>).GetConstructor(Type.EmptyTypes);
var outerAnonymousTypeAProperty = typeof(AnonymousType <int, AnonymousType>).GetProperty("a");
var outerAnonymousTypeBProperty = typeof(AnonymousType <int, AnonymousType>).GetProperty("b");
// new AnonymousType() { a = 2, b = new AnonymousType() { a = _searchedExpression, b = 1 } }
var innerExpression = Expression.MemberInit(
Expression.New(_anonymousTypeCtorWithoutArgs),
Expression.Bind(_anonymousTypeAProperty, _searchedExpression),
Expression.Bind(_anonymousTypeBProperty, Expression.Constant(1)));
var fullExpression = Expression.MemberInit(
Expression.New(outerAnonymousTypeCtor),
Expression.Bind(outerAnonymousTypeAProperty, Expression.Constant(2)),
Expression.Bind(outerAnonymousTypeBProperty, innerExpression));
var result = AccessorFindingExpressionVisitor.FindAccessorLambda(_searchedExpression, fullExpression, _nestedInputParameter);
Expression <Func <AnonymousType <int, AnonymousType>, int> > expectedResult = input => input.b.a;
ExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
}
public void NestedMemberBindingExpressionWithDerivedType()
{
var outerTypeCtor = typeof(Result <BaseValue>).GetConstructor(Type.EmptyTypes);
var outerTypeValueProperty = typeof(Result <BaseValue>).GetProperty("Value");
var innerTypeCtor = typeof(DerivedValue).GetConstructor(Type.EmptyTypes);
var innerTypeStringValueProperty = typeof(DerivedValue).GetProperty("StringValue");
var searchedExpression = Expression.Constant("a");
var nestedInputParameter = Expression.Parameter(typeof(Result <BaseValue>), "input");
// new Result<BaseValue>() { Value = new DerivedValue() { StringValue = _searchedExpression } }
var innerExpression = Expression.MemberInit(
Expression.New(innerTypeCtor),
Expression.Bind(innerTypeStringValueProperty, searchedExpression));
var fullExpression = Expression.MemberInit(
Expression.New(outerTypeCtor),
Expression.Bind(outerTypeValueProperty, innerExpression));
var result = AccessorFindingExpressionVisitor.FindAccessorLambda(searchedExpression, fullExpression, nestedInputParameter);
Expression <Func <Result <BaseValue>, string> > expectedResult = input => ((DerivedValue)input.Value).StringValue;
ExpressionTreeComparer.CheckAreEqualTrees(expectedResult, result);
}
public void SearchedExpressionNotFound_AlthoughInUnaryPlusExpression()
{
var fullExpression = Expression.UnaryPlus(_searchedExpression);
AccessorFindingExpressionVisitor.FindAccessorLambda(_searchedExpression, fullExpression, _intInputParameter);
}
public void SearchedExpressionNotFound_AlthoughInNewExpressionWithoutMember()
{
var fullExpression = Expression.New(_anonymousTypeCtorWithArgs, _searchedExpression, _searchedExpression);
AccessorFindingExpressionVisitor.FindAccessorLambda(_searchedExpression, fullExpression, _simpleInputParameter);
}