在实体框架中保存ViewState时出错 [英] Error Saving ViewState in Entity Framework

问题描述

我正在.NET Entity Framework 4.0中工作
我正在使用viewstate保存一个实体。而且我也把这个实体序列化了。但是当我尝试保存数据到viewstate，得到这个错误：

  Microsoft JScript运行时错误：Sys.WebForms.PageRequestManagerServerErrorException：错误序列化'System.Collections.Generic.List`1类型的System.Collections.Generic.List`1 [Pc.PrecisionCare2.ModelTypes.Medication]'[[Pc.PrecisionCare2.ModelTypes.Medication，PrecisionCare2ModelTypes，Version = 1.0。 0.0，Culture = neutral，PublicKeyToken = null]]'
  

解决方案

也许这将有助于任何人。我想自己在Viewstate中序列化一个实体，找不到一个好的解决方案（XMLSerialization，Byte Serializing，DataContract）。我发现我可以扩展代码生成的类（它们是部分的）并使其成为可序列化。

例如，这是一个.net代码生成的实体：

  // ----------------------- -------------------------------------------------- ----- 
 //<自动生成> 
 //该代码是从模板生成的。 
 // 
 //手动更改此文件可能会导致应用程序出现意外的行为。 
 //如果重新生成代码，则对该文件的手动更改将被覆盖。 
 //< / auto-generated> 
 // -------------------------------------------- ---------------------------------- 
 
命名空间OAuthServerBroker.EF 
 {
 using System; 
使用System.Collections.Generic; 
 
 public partial class ResourceOwner 
 {
 public ResourceOwner（）
 {
 this.Grant = new HashSet&Grant>（）; 
} 
 
 public System.Guid ResourceOwner_ID {get;组; } 
 public string ResourceOwner_Username {get;组; } 
 
 public virtual ICollection&Grant>授予{get;组; } 
} 
} 
  

当我创建一个新的类文件类名和命名空间我可以使Entity Serializable：）。

  using System; 
 
命名空间OAuthServerBroker.EF 
 {
 [Serializable] 
 public partial class ResourceOwner 
 {
 public EntityState State {get;组; } //甚至可以放入新的属性
} 
} 
  

希望这个可能会帮助任何人，因为它是一个旧帖子：（。

I am working in .NET Entity Framework 4.0 I am using viewstate to save an entity. And I have serialize that entity as well. But when I try to save data to viewstate, getting this error:

Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: Error serializing value 'System.Collections.Generic.List`1[Pc.PrecisionCare2.ModelTypes.Medication]' of type 'System.Collections.Generic.List`1[[Pc.PrecisionCare2.ModelTypes.Medication, PrecisionCare2ModelTypes, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]].'

解决方案

Maybe this will help anyone. I wanted to serialize a entity in the Viewstate myself and couldn't find a good solution (XMLSerialization, Byte Serializing, DataContract). What I found out is that I could "extend" the code generated classes (they are partial) and make it Serializable.

For example this is a .net code generated entity:

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated from a template.
//
//     Manual changes to this file may cause unexpected behavior in your application.
//     Manual changes to this file will be overwritten if the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

namespace OAuthServerBroker.EF
{
    using System;
    using System.Collections.Generic;

    public partial class ResourceOwner
    {
        public ResourceOwner()
        {
            this.Grant = new HashSet<Grant>();
        }

        public System.Guid ResourceOwner_ID { get; set; }
        public string ResourceOwner_Username { get; set; }

        public virtual ICollection<Grant> Grant { get; set; }
    }
}

When I create a new class file with the same class name and namespace I can make the Entity Serializable :).

using System;

namespace OAuthServerBroker.EF
{
    [Serializable]
    public partial class ResourceOwner
    {
        public EntityState State { get; set; } //can even put into new properties
    }
}

Hope this might help anyone since it's an old post :(.

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