Question

I m a tad stuck trying to get a List to load from the ViewState using ASP.NET 4 and VB.NET. When I try to retrieve a collection using:

Public Property ItemsForImport As List(Of ImportItem)
    Get
        Return IIf(ViewState("ItemsForImport") Is Nothing, New List(Of ImportItem), CType(ViewState("ItemsForImport"), List(Of ImportItem)))
    End Get
    Set(value As List(Of ImportItem))
        ViewState("ItemsForImport") = value
    End Set
End Property

我例外:

[A]System.Collections.Generic.List`1[ImportItem] cannot be cast to [B]System.Collections.Generic.List`1[ImportItem]. 
Type A originates from  mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089  in the context  LoadNeither  at location  C:WindowsMicrosoft.NetassemblyGAC_32mscorlibv4.0_4.0.0.0__b77a5c561934e089mscorlib.dll . 
Type B originates from  mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089  in the context  LoadNeither  at location      C:WindowsMicrosoft.NetassemblyGAC_32mscorlibv4.0_4.0.0.0__b77a5c561934e089mscorlib.dll .

偷窃表明,收集工作没有结果,有2个项目。这一类别仅作一次界定,我从C:Coricrosoft.NETFrameworkv4.0.30319中清理了我的临时档案。临时伙伴关系网文件

总的来说,我有时看到(我假定每个人都会这样做)在进行快速变化的同时进行分解,但经过了两次复习。是否有人失踪?

Answer 1

检查贵项目夹。在解决办法中,你可能有一个重复的组合,造成冲突。您是否有提及同一集会的母子项目?

阅读其中一些解决办法,看看问题是否适合:

InvalidCastException for two Objects of the same type

ASP.NET 封装

Error Rendering control - [A] cannot be cast to [B] in the context LoadNeither

友情链接