internal override Expression VisitMemberInit(MemberInitExpression init)
{
Expression result = init;
MemberAssignmentAnalysis previousNested = null;
foreach (var binding in init.Bindings)
{
MemberAssignment assignment = binding as MemberAssignment;
if (assignment == null)
{
continue;
}
MemberAssignmentAnalysis nested = MemberAssignmentAnalysis.Analyze(this.entity, assignment.Expression);
if (nested.MultiplePathsFound)
{
this.multiplePathsFound = true;
break;
}
Exception incompatibleException = nested.CheckCompatibleAssignments(init.Type, ref previousNested);
if (incompatibleException != null)
{
this.incompatibleAssignmentsException = incompatibleException;
break;
}
if (this.pathFromEntity.Count == 0)
{
this.pathFromEntity.AddRange(nested.GetExpressionsToTargetEntity());
}
}
return(result);
}
/// <summary>
/// If there is a MemberInitExpression 'new Person { ID = p.ID, Friend = new Person { ID = p.Friend.ID }}'
/// or a NewExpression 'new { ID = p.ID, Friend = new { ID = p.Friend.ID }}',
/// this method validates against the RHS of the member assigment, the expression "p.ID" for example.
/// </summary>
/// <param name="expressionToAssign">The expression to validate.</param>
/// <param name="initType">Type of the MemberInit or the New expression.</param>
/// <param name="previousNested">The outter nested initializer of the current initializer we are checking.</param>
/// <returns>true if the expression to assign is fine; false otherwise.</returns>
private bool CheckCompatibleAssigmentExpression(Expression expressionToAssign, Type initType, ref MemberAssignmentAnalysis previousNested)
{
MemberAssignmentAnalysis nested = MemberAssignmentAnalysis.Analyze(this.entity, expressionToAssign);
if (nested.MultiplePathsFound)
{
this.multiplePathsFound = true;
return(false);
}
// When we're visitng a nested entity initializer, we're exactly one level above that.
Exception incompatibleException = nested.CheckCompatibleAssignments(initType, ref previousNested);
if (incompatibleException != null)
{
this.incompatibleAssignmentsException = incompatibleException;
return(false);
}
if (this.pathFromEntity.Count == 0)
{
this.pathFromEntity.AddRange(nested.GetExpressionsToTargetEntity());
}
return(true);
}
internal Exception CheckCompatibleAssignments(Type targetType, ref MemberAssignmentAnalysis previous)
{
if (previous == null)
{
previous = this;
return(null);
}
Expression[] expressionsToTargetEntity = previous.GetExpressionsToTargetEntity();
Expression[] candidate = this.GetExpressionsToTargetEntity();
return(CheckCompatibleAssignments(targetType, expressionsToTargetEntity, candidate));
}
internal Exception CheckCompatibleAssignments(Type targetType, ref MemberAssignmentAnalysis previous)
{
if (previous == null)
{
previous = this;
return null;
}
Expression[] expressionsToTargetEntity = previous.GetExpressionsToTargetEntity();
Expression[] candidate = this.GetExpressionsToTargetEntity();
return CheckCompatibleAssignments(targetType, expressionsToTargetEntity, candidate);
}
private bool CheckCompatibleAssigmentExpression(Expression expressionToAssign, Type initType, ref MemberAssignmentAnalysis previousNested)
{
MemberAssignmentAnalysis analysis = Analyze(this.entity, expressionToAssign);
if (analysis.MultiplePathsFound)
{
this.multiplePathsFound = true;
return(false);
}
Exception exception = analysis.CheckCompatibleAssignments(initType, ref previousNested);
if (exception != null)
{
this.incompatibleAssignmentsException = exception;
return(false);
}
if (this.pathFromEntity.Count == 0)
{
this.pathFromEntity.AddRange(analysis.GetExpressionsToTargetEntity());
}
return(true);
}
private Expression RebindEntityMemberInit(MemberInitExpression init)
{
Debug.Assert(init != null, "init != null");
Debug.Assert(init.Bindings.Count > 0, "init.Bindings.Count > 0 -- otherwise this is just empty construction");
Expression[] expressions;
if (!this.pathBuilder.HasRewrites)
{
MemberAssignmentAnalysis propertyAnalysis = MemberAssignmentAnalysis.Analyze(
this.pathBuilder.LambdaParameterInScope,
((MemberAssignment)init.Bindings[0]).Expression);
expressions = propertyAnalysis.GetExpressionsToTargetEntity();
Debug.Assert(expressions.Length != 0, "expressions.Length != 0 -- otherwise there is no correlation to parameter in entity member init");
}
else
{
expressions = MemberAssignmentAnalysis.EmptyExpressionArray;
}
Expression entryParameterAtMemberInit = this.pathBuilder.ParameterEntryInScope;
List <string> propertyNames = new List <string>();
List <Func <object, object, Type, object> > propertyFunctions = new List <Func <object, object, Type, object> >();
Type projectedType = init.NewExpression.Type;
Expression projectedTypeExpression = Expression.Constant(projectedType, typeof(Type));
Expression entryToInitValue; Expression expectedParamValue; ParameterExpression entryParameterForMembers; ParameterExpression expectedParameterForMembers; string[] expressionNames = expressions.Skip(1).Select(e => ((MemberExpression)e).Member.Name).ToArray();
if (expressions.Length <= 1)
{
entryToInitValue = this.pathBuilder.ParameterEntryInScope;
expectedParamValue = this.pathBuilder.ExpectedParamTypeInScope;
entryParameterForMembers = (ParameterExpression)this.pathBuilder.ParameterEntryInScope;
expectedParameterForMembers = (ParameterExpression)this.pathBuilder.ExpectedParamTypeInScope;
}
else
{
entryToInitValue = this.GetDeepestEntry(expressions);
expectedParamValue = projectedTypeExpression;
entryParameterForMembers = Expression.Parameter(typeof(object), "subentry" + this.identifierId++);
expectedParameterForMembers = (ParameterExpression)this.pathBuilder.ExpectedParamTypeInScope;
ProjectionPath entryPath = new ProjectionPath(
(ParameterExpression)this.pathBuilder.LambdaParameterInScope,
this.pathBuilder.ExpectedParamTypeInScope,
this.pathBuilder.ParameterEntryInScope,
expressions.Skip(1));
this.annotations.Add(entryToInitValue, new ExpressionAnnotation()
{
Segment = entryPath[entryPath.Count - 1]
});
this.annotations.Add(entryParameterForMembers, new ExpressionAnnotation()
{
Segment = entryPath[entryPath.Count - 1]
});
this.pathBuilder.RegisterRewrite(this.pathBuilder.LambdaParameterInScope, expressionNames, entryParameterForMembers);
}
for (int i = 0; i < init.Bindings.Count; i++)
{
MemberAssignment assignment = (MemberAssignment)init.Bindings[i];
propertyNames.Add(assignment.Member.Name);
LambdaExpression propertyLambda;
if ((ClientType.CheckElementTypeIsEntity(assignment.Member.ReflectedType) &&
assignment.Expression.NodeType == ExpressionType.MemberInit))
{
Expression nestedEntry = CallMaterializer(
"ProjectionGetEntry",
entryParameterAtMemberInit,
Expression.Constant(assignment.Member.Name, typeof(string)));
ParameterExpression nestedEntryParameter = Expression.Parameter(
typeof(object),
"subentry" + this.identifierId++);
ProjectionPath entryPath;
ExpressionAnnotation entryAnnotation;
if (this.annotations.TryGetValue(this.pathBuilder.ParameterEntryInScope, out entryAnnotation))
{
entryPath = new ProjectionPath(
(ParameterExpression)this.pathBuilder.LambdaParameterInScope,
this.pathBuilder.ExpectedParamTypeInScope,
entryParameterAtMemberInit);
entryPath.AddRange(entryAnnotation.Segment.StartPath);
}
else
{
entryPath = new ProjectionPath(
(ParameterExpression)this.pathBuilder.LambdaParameterInScope,
this.pathBuilder.ExpectedParamTypeInScope,
entryParameterAtMemberInit,
expressions.Skip(1));
}
ProjectionPathSegment nestedSegment = new ProjectionPathSegment(
entryPath,
assignment.Member.Name,
assignment.Member.ReflectedType);
entryPath.Add(nestedSegment);
string[] names = (entryPath.Where(m => m.Member != null).Select(m => m.Member)).ToArray();
this.annotations.Add(nestedEntryParameter, new ExpressionAnnotation()
{
Segment = nestedSegment
});
this.pathBuilder.RegisterRewrite(this.pathBuilder.LambdaParameterInScope, names, nestedEntryParameter);
Expression e = this.Visit(assignment.Expression);
this.pathBuilder.RevokeRewrite(this.pathBuilder.LambdaParameterInScope, names);
this.annotations.Remove(nestedEntryParameter);
e = Expression.Convert(e, typeof(object));
ParameterExpression[] parameters =
new ParameterExpression[]
{
this.materializerExpression,
nestedEntryParameter,
expectedParameterForMembers,
};
propertyLambda = Expression.Lambda(e, parameters);
Expression[] nestedParams =
new Expression[]
{
this.materializerExpression,
nestedEntry,
expectedParameterForMembers,
};
var invokeParameters =
new ParameterExpression[]
{
this.materializerExpression,
(ParameterExpression)entryParameterAtMemberInit,
expectedParameterForMembers,
};
propertyLambda = Expression.Lambda(Expression.Invoke(propertyLambda, nestedParams), invokeParameters);
}
else
{
Expression e = this.Visit(assignment.Expression);
e = Expression.Convert(e, typeof(object));
ParameterExpression[] parameters =
new ParameterExpression[]
{
this.materializerExpression,
entryParameterForMembers,
expectedParameterForMembers,
};
propertyLambda = Expression.Lambda(e, parameters);
}
#if TRACE_CLIENT_PROJECTIONS
Trace.WriteLine("Compiling lambda for " + assignment.Member.Name + ": " + propertyLambda);
#endif
propertyFunctions.Add((Func <object, object, Type, object>)propertyLambda.Compile());
}
for (int i = 1; i < expressions.Length; i++)
{
this.pathBuilder.RevokeRewrite(this.pathBuilder.LambdaParameterInScope, expressionNames);
this.annotations.Remove(entryToInitValue);
this.annotations.Remove(entryParameterForMembers);
}
Expression reboundExpression = CallMaterializer(
"ProjectionInitializeEntity",
this.materializerExpression,
entryToInitValue,
expectedParamValue,
projectedTypeExpression,
Expression.Constant(propertyNames.ToArray()),
Expression.Constant(propertyFunctions.ToArray()));
return(Expression.Convert(reboundExpression, projectedType));
}