public override object VisitQueryExpression(QueryExpression queryExpression, object data)
{
if (this.queryExpression != null) // prevent endloss loop: var n = from n select n; n.$ (doesn't make sense, but you can type this)
{
return(null);
}
this.queryExpression = queryExpression;
IReturnType type = null;
QueryExpressionSelectClause selectClause = queryExpression.SelectOrGroupClause as QueryExpressionSelectClause;
if (selectClause != null)
{
InvocationExpression selectInvocation = new InvocationExpression(new MemberReferenceExpression(queryExpression.FromClause.InExpression, "Select"));
LambdaExpression selectLambdaExpr = new LambdaExpression();
selectLambdaExpr.Parent = selectInvocation;
selectLambdaExpr.Parameters.Add(new ParameterDeclarationExpression(null, "par"));
selectLambdaExpr.ExpressionBody = selectClause.Projection;
TypeReference typeRef = new TypeReference("System.Func");
typeRef.GenericTypes.Add(TypeReference.Null);
ResolveResult result = resolver.ResolveExpression(selectLambdaExpr, resolver.ResolvePosition, false);
typeRef.GenericTypes.Add(NRefactoryResolver.ConvertToTypeReference(result.ResolvedType));
ObjectCreateExpression createExpression = new ObjectCreateExpression(typeRef, new List <Expression> (new Expression [] {
null,
selectLambdaExpr
}));
selectInvocation.Arguments.Add(createExpression);
return(CreateResult(ResolveType(selectInvocation)));
}
QueryExpressionGroupClause groupClause = queryExpression.SelectOrGroupClause as QueryExpressionGroupClause;
if (groupClause != null)
{
InvocationExpression groupInvocation = new InvocationExpression(new MemberReferenceExpression(queryExpression.FromClause.InExpression, "GroupBy"));
LambdaExpression keyLambdaExpr = new LambdaExpression();
keyLambdaExpr.Parent = groupInvocation;
keyLambdaExpr.Parameters.Add(new ParameterDeclarationExpression(null, "par"));
keyLambdaExpr.ExpressionBody = groupClause.GroupBy;
groupInvocation.Arguments.Add(keyLambdaExpr);
LambdaExpression elementLambdaExpr = new LambdaExpression();
elementLambdaExpr.Parent = groupInvocation;
elementLambdaExpr.Parameters.Add(new ParameterDeclarationExpression(null, "par"));
elementLambdaExpr.ExpressionBody = groupClause.Projection;
groupInvocation.Arguments.Add(elementLambdaExpr);
return(CreateResult(ResolveType(groupInvocation)));
}
if (type != null)
{
return(CreateResult(new DomReturnType("System.Collections.Generic.IEnumerable", false, new List <IReturnType> (new IReturnType[] { type }))));
}
return(null);
}
