DevForce 2010: Serialization

Serialization

Printed From: IdeaBlade
Category: DevForce
Forum Name: DevForce 2010
Forum Discription: For .NET 4.0
URL: http://www.ideablade.com/forum/forum_posts.asp?TID=2294
Printed Date: 29-Jul-2026 at 11:13am

Topic: Serialization

Posted By: antonio_sergio
Subject: Serialization
Date Posted: 11-Nov-2010 at 3:51am

Good morning,
I created a query that takes as parameter an array of strings.
When I try to run my application gives me the error below:

There was an error while trying to serialize parameter http://ideablade.com/EntityModel:entityQuerySurrogate - http://ideablade.com/EntityModel:entityQuerySurrogate . The InnerException message was 'Type 'System.String[]' with data contract name 'ArrayOfstring:http://schemas.microsoft.com/2003/10/Serialization/Arrays' is not expected. Add any types not known statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to DataContractSerializer.'. Please see InnerException for more details.

When I put the attribute [KnowType(typeof(string[]))] in my class it gives me another error:

Type 'System.Collections.Generic.List`1[System.String]' cannot be added to list of known types since another type 'System.String[]' with the same data contract name 'http://schemas.microsoft.com/2003/10/Serialization/Arrays:ArrayOfstring' is already present.

What am I doing wrong??

Regards,

Sérgio Magalhães

Replies:

Posted By: sbelini
Date Posted: 12-Nov-2010 at 3:34pm

Hi Sergio,

Can you show me the snippet that is causing the issue?

Silvio.

Posted By: antonio_sergio
Date Posted: 15-Nov-2010 at 2:42am

Hi Silvio,

The query on server side:

	[Query]
        public IEnumerable<WebMarca> WebFind(string[] Codigo)
        {
            List<WebMarca> lista = new List<WebMarca>();
            lista.Add(ConvertToWeb(ClsPlural.Find(Codigo)));
            return lista;
        }

The query call on client side:

	void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            EntityQuery<WebMarca> query = mgr.Find();
            string[] Codigos = new string[] { "1", "aa" };
            query.AddParameter(Codigos);
            mgr.ExecuteQueryAsync<WebMarca>(query, ExecCompleted, true);
        }

And the error:

Regards,

Sérgio Magalhães

Posted By: sbelini
Date Posted: 16-Nov-2010 at 5:08pm

Hi Sergio,

I could verify the behavior here.

Instead of using an array, you can use List<string>:

var Codigos = new List<string>(new string[] { "1", "aa" });

Regards,

Silvio.