MetaLinq - LINQ to Expressions

Patch Uploaded: #14254

Dzmitry_Mikhalap — Fri, 05 Apr 2013 13:22:59 GMT

Description:
Fix: multithread support

Source code checked in, #69709

Project Collection Service Accounts — Mon, 01 Oct 2012 22:10:56 GMT

Upgrade: New Version of LabDefaultTemplate.xaml. To upgrade your build definitions, please visit the following link: http://go.microsoft.com/fwlink/?LinkId=254563

Source code checked in, #69708

Project Collection Service Accounts — Mon, 01 Oct 2012 22:06:45 GMT

Checked in by server upgrade

Created Issue: Nuget [22509]

mcintyre321 — Sat, 14 Apr 2012 12:44:21 GMT

Would you like to put this on to Nuget, or would you mind if I did so?

New Post: Doesn't work with Entity Framework 4 objects

cgsoldier — Wed, 14 Dec 2011 18:33:07 GMT

I am having the same issue on deserialization only, serialization of EntityFramework Objects works fine. has anyone found a fix for this yet?

New Post: Very noisy Xml node

mwpowellnm — Sun, 04 Sep 2011 18:09:25 GMT

Hello,

I am new to MetaLinq, glad I found it, don't get me wrong. We want to necessarily serialize and deserialize an Expression through an Xml stream. We get something like this:

We save the serialized contents this as the contents of an element, but is the Xmlns Xsi and Xsd really necessary? Or can we refrain from saving that?

In other words, our <EditableLambdaExpression/> is going to appear in the context of a more complex Xml structure, so Xsi or Xsd would necessarily be a distraction from that.

Thank you...

Redards,

Michael

Commented Issue: Cannot serialize expressions that include captured variables [10990]

mwpowellnm — Sun, 04 Sep 2011 14:55:23 GMT

captured variables are compiled into private sealed classes and therefore cannot be serialized - trying to serializing such an expression fails
Comments: ** Comment from web user: mwpowellnm **

it's been awhile since this was last commented on. can you clarify what this means? if I understand it rightly, if I capture a local variable int i = 3 in my Lambda Expression prior to serializing, I should be unable to compile or necessarily invoke the same Lambda Expression when I deserialize it... unless I've also got an int i in the same scope as that? thank you... if so, it seems to me variables that can be "seen" is a reasonable "limitation" operating with Lambdas, and necessarily disciplines developers to make proper use of them.

New Post: Error while serializing an expression

Akwel — Fri, 29 Jul 2011 09:58:47 GMT

Hi,

I'm a beginner with Linq and I have an issue while using MetaLinq for a test.
I need to bind a gridview to data from a server using a Linq query. I looked on the web how to make a data provider, and now I'm trying to serialize the expression to send it to the server side so that it can execute it on the data.

Here is my code :

QueryableData<QueryableObject> objects = new QueryableData<QueryableObject>(); // QueryableData implements IOrderedQueryable

var query = objects.Where(obj => obj.name == "test").Select(obj => obj.name);

gridControl1.DataSource = query.ToList();

Then to get some data, in the method Execute(Expression) of the DataProvider I try to serialize the expression :

EditableExpression e = CheckSerializationInternal(EditableExpression.CreateEditableExpression(expression)); // CheckSerializationInternal is the same as in the MetaLinq demo

I got the error "There was an error generating the XML document" at line :

xs.Serialize(ms, mutableLambda);

Here is the string value of "expression" :

{value(LinqDataAdapter.QueryableData`1[WCFIntefaces.QueryableObject]).Where(obj => (obj.name = "test")).Select(obj => obj.name)}

I'm sure I failed somewhere, but I can't find the reason why. I'm still a beginner...

Thanks for your help.

Axel

Created Issue: Expression Constant comparing Nullable fails with InvalidOperationException [20253]

RobinHSanner — Thu, 17 Mar 2011 16:10:10 GMT

The exception below occurs when comparing an object property that is a Nullable<DateTime>. The attached file resolved the problem.

System.InvalidOperationException was unhandled
Message=The binary operator LessThanOrEqual is not defined for the types 'System.Nullable`1[System.DateTime]' and 'System.DateTime'.
Source=System.Core
StackTrace:
at System.Linq.Expressions.Expression.GetComparisonOperator(ExpressionType binaryType, String opName, Expression left, Expression right, Boolean liftToNull)
at System.Linq.Expressions.Expression.LessThanOrEqual(Expression left, Expression right, Boolean liftToNull, MethodInfo method)
at System.Linq.Expressions.Expression.MakeBinary(ExpressionType binaryType, Expression left, Expression right, Boolean liftToNull, MethodInfo method, LambdaExpression conversion)
at System.Linq.Expressions.Expression.MakeBinary(ExpressionType binaryType, Expression left, Expression right)
at ExpressionBuilder.EditableBinaryExpression.ToExpression() in D:\Visual Studio Projects\Deloitte - Innovation Center\Dev\Phase 1\TestApps\Diet.Expressions\ExpressionBuilder\Expressions\EditableBinaryExpression.cs:line 48
at ExpressionBuilder.EditableBinaryExpression.ToExpression() in D:\Visual Studio Projects\Deloitte - Innovation Center\Dev\Phase 1\TestApps\Diet.Expressions\ExpressionBuilder\Expressions\EditableBinaryExpression.cs:line 48
at ExpressionBuilder.EditableBinaryExpression.ToExpression() in D:\Visual Studio Projects\Deloitte - Innovation Center\Dev\Phase 1\TestApps\Diet.Expressions\ExpressionBuilder\Expressions\EditableBinaryExpression.cs:line 48
at ExpressionBuilder.EditableLambdaExpression.ToExpression() in D:\Visual Studio Projects\Deloitte - Innovation Center\Dev\Phase 1\TestApps\Diet.Expressions\ExpressionBuilder\Expressions\EditableLambdaExpression.cs:line 53

Reviewed: Serializable V1.1b (Jan 07, 2011)

chrisghardwick — Fri, 07 Jan 2011 14:12:07 GMT

Rated 5 Stars (out of 5) - Excellent. Works very well.

Patch Uploaded: #6864

benpriebe — Wed, 22 Sep 2010 04:52:35 GMT

benpriebe has uploaded a patch.

Description:
Modified the following method to utilize the members parameters - this is necessary to utilize expressions made using anonymous types.

// Methods
public override Expression ToExpression()
{
if (Constructor != null)
{
var members = Members.GetMembers();
if (members != null && members.Any())
{
return Expression.New(Constructor, Arguments.GetExpressions(), members);
}
else
{
return Expression.New(Constructor, Arguments.GetExpressions());
}
}
else
{
return Expression.New(Type);
}
}

Source code checked in, #52373

_TFSSERVICE — Wed, 28 Jul 2010 17:08:20 GMT

Checked in by server upgrade

Project License Changed

Fri, 11 Jun 2010 09:21:43 GMT

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New Post: Doesn't work with Entity Framework 4 objects

omayhemo — Thu, 03 Jun 2010 21:45:18 GMT

Null Reference Error on:

public static MemberInfo FromSerializableForm(this MemberInfo memberInfo, string serializedValue)
        {
            string[] fullName = SplitString(serializedValue);
            string name = fullName[1];
            MemberInfo member = (from m in Type.GetType(fullName[0]).GetMembers()
                                     where m.ToString() == name
                                     select m).First();
            return member;

        }

Runtime evaluation of fullName[0] reveals everything as expected, however Type.GetType(fullName[0]) returns null.

Created Issue: cannot serialize EditableMemeberInfoCollection [15760]

habmic — Thu, 07 Jan 2010 09:49:53 GMT

hello,
i am tring to cearte an expression, serialize it and then save it to my db.
the expression is like this:

Expression<Func<Person,List<Address>>> exp = (person) => person.HasAddress ? person.Addresses.ToList() : new List<Address>();

then i serialize it using DataContactSerializer.
up until now every thing is working fine.

i am deserializing it from the DB and save it in velocity cache,
then i am getting this expection:
"Type 'Address' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute"

any idea?
thanks!

Reviewed: Serializable V1.1b (六月 18, 2009)

ruby — Thu, 18 Jun 2009 09:20:40 GMT

Rated 4 Stars (out of 5) - it's very good.

Updated Release: Serializable V1.1b (Feb 27, 2009)

idof — Fri, 27 Feb 2009 13:29:06 GMT

Some bug fixes related to expression containing static members and static method calls.

Released: Serializable V1.1b (Feb 27, 2009)

Fri, 27 Feb 2009 13:29:05 GMT

Some bug fixes related to expression containing static members and static method calls.

Created Release: Serializable V1.1a (Feb 27, 2009)

idof — Fri, 27 Feb 2009 13:28:11 GMT

Some bug fixes related to expression containing static members and static method calls.

Source code checked in, #31856

idof — Fri, 27 Feb 2009 13:20:02 GMT