metalinq Forum Rss Feed

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

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

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.

New Post: Deserialization from XML fails with Generic Parameters

reverseblade — Fri, 21 Nov 2008 07:50:48 GMT

thanks a million you are awesome!

On Thu, Nov 20, 2008 at 9:00 PM, [email removed] wrote:
> From: idof
>
> Hi,
>
> There is a solution for this problem, and it will be uploaded in a couple of
> days. In the meantime, here's a fix you can apply in your code (just change
> it and recompile the project).
>
> In the Extensions folder, replace the methods code in the
> ReflectionExtensions.cs file with the following:
>
> public static string ToSerializableForm(this MethodInfo method)
> {
> string serializableName =
> method.DeclaringType.AssemblyQualifiedName + Environment.NewLine;
> if (!method.IsGenericMethod)
> {
> serializableName += method.ToString();
> }
> else
> {
> serializableName +=
> method.GetGenericMethodDefinition().ToString() + Environment.NewLine +
> String.Join(Environment.NewLine,
> method.GetGenericArguments().Select(ty =>
> ty.ToSerializableForm()).ToArray());
> }
> return serializableName;
> }
>
> public static MethodInfo FromSerializableForm(this MethodInfo
> methodInfo, string serializedValue)
> {
> string[] fullName = SplitString(serializedValue);
> string name = fullName[1];
> MethodInfo method = (from m in
> Type.GetType(fullName[0]).GetMethods()
> where m.ToString() == name
> select m).First();
>
> if (method.IsGenericMethod)
> {
> method = method.MakeGenericMethod(fullName.Skip(2).Select(s
> => typeof(string).FromSerializableForm(s)).ToArray());
> }
> return method;
> }
>
> this code will not change serialized trees that didn't use generic methods,
> but will create new serialization data for generic methods - so just re-run
> the serialization for any expressions that contained generic method
>
> I will add this code to the current version and update the version in a
> couple of days.
>
> Ido.
>
> Read the full discussion online.
>
> To add a post to this discussion, reply to this email
> ([email removed])
>
> To start a new discussion for this project, email
> [email removed]
>
> You are receiving this email because you subscribed to this discussion on
> CodePlex. You can unsubscribe on codePlex.com.
>
> Please note: Images and attachments will be removed from emails. Any posts
> to this discussion will also be available online at codeplex.com

New Post: Deserialization from XML fails with Generic Parameters

idof — Thu, 20 Nov 2008 19:00:47 GMT

Hi,

There is a solution for this problem, and it will be uploaded in a couple of days. In the meantime, here's a fix you can apply in your code (just change it and recompile the project).

In the Extensions folder, replace the methods code in the ReflectionExtensions.cs file with the following:

         public static string ToSerializableForm(this MethodInfo method)
        {
            string serializableName = method.DeclaringType.AssemblyQualifiedName + Environment.NewLine;
            if (!method.IsGenericMethod)
            {
                serializableName += method.ToString();
            }
            else
            {
                serializableName += method.GetGenericMethodDefinition().ToString() + Environment.NewLine +
                    String.Join(Environment.NewLine, method.GetGenericArguments().Select(ty => ty.ToSerializableForm()).ToArray());
            }
            return serializableName;
        }

       public static MethodInfo FromSerializableForm(this MethodInfo methodInfo, string serializedValue)
       {
            string[] fullName = SplitString(serializedValue);
            string name = fullName[1];
            MethodInfo method = (from m in Type.GetType(fullName[0]).GetMethods()
                                 where m.ToString() == name
                                 select m).First();

            if (method.IsGenericMethod)
            {
                method = method.MakeGenericMethod(fullName.Skip(2).Select(s => typeof(string).FromSerializableForm(s)).ToArray());
            }
            return method;
        }

this code will not change serialized trees that didn't use generic methods, but will create new serialization data for generic methods - so just re-run the serialization for any expressions that contained generic method

I will add this code to the current version and update the version in a couple of days.

Ido.

New Post: Deserialization from XML fails with Generic Parameters

reverseblade — Wed, 19 Nov 2008 08:34:52 GMT

Hello

suppose that we have the following Expression

Expression <Func<Foo,bool>> myEx = x = > x.Bar<string>();

Here bar is a method that takes a generic parameter, deserialization of this expression from xml fails with an XML error. Workarounds ?

New Post: The code does not compile, the csproj does not correspond to the file structure

idof — Tue, 28 Oct 2008 19:39:37 GMT

Hi,

The csproj is repaired, please download again.

Thank you for noting us.

Ido Flatow

New Post: The code does not compile, the csproj does not correspond to the file structure

ursuletzu — Mon, 27 Oct 2008 15:14:46 GMT

The latest release from 9 Oct has some problems. The cproj does not mirror the file structure, references are missing etc...
Any thoughts on fixing this?

New Post: What's up with Funclet

idof — Mon, 11 Aug 2008 20:22:20 GMT

I didn't see this class in the .NET framework 3.5 SP1, I guess it was removed (checked it with Reflector to make sure).

New Post: EditableNewArrayExpression.set_NodeType

idof — Mon, 11 Aug 2008 20:18:12 GMT

We have found this to be a bug and it will be fixed on the next release, along with other fixes made to the NewArrayExpression

NEW POST: EditableNewArrayExpression.set_NodeType

francois_tanguay — Mon, 01 Oct 2007 04:20:02 GMT

After looking at the following statements:

if (_nodeType == ExpressionType.NewArrayInit || _nodeType == ExpressionType.NewArrayBounds)
_nodeType = value;
else
throw new InvalidOperationException("NodeType for NewArrayExpression must be ExpressionType.NewArrayInit or ExpressionType.NewArrayBounds");

I think the IF comparison should be performed on value keyword, not _nodeType

NEW POST: What's up with Funclet

francois_tanguay — Mon, 01 Oct 2007 01:00:23 GMT

Is this Pre-Beta2 stuff and it disappeared?

I can't seem to find this espression type anymore.

NEW POST: EditableExpression.CreateEditableExpression

francois_tanguay — Mon, 01 Oct 2007 00:58:24 GMT

Couldn't you simply have a single method?

public static EditableExpression CreateEditableExpression<T>(Expression<T> ex)
{
LambdaExpression lambEx = Expression.Lambda<T>(ex.Body, ex.Parameters);
return new EditableLambdaExpression(lambEx);
}

NEW POST: Good stuff!

francois_tanguay — Mon, 01 Oct 2007 00:38:35 GMT

Haven't looked at it in the details but so far... this rocks!