C#错误System.InvalidCastException [英] C# error System.InvalidCastException

问题描述

System.InvalidCastException在以下行:

System.InvalidCastException on following line:

If (System.Threading.Thread.CurrentPrincipal.Identity.IsAuthenticated = False) Then
        CType(System.Threading.Thread.CurrentPrincipal.Identity,
        System.Web.ClientServices.ClientFormsIdentity).RevalidateUser()

推荐答案

我相信您会收到此错误:
无法将类型为"System.Security.Principal.GenericIdentity"的对象转换为类型为"System.Web.ClientServices.ClientFormsIdentity"的对象.

只要您未通过身份验证，就会发生这种情况.要获取FormsIdentity，您需要已通过身份验证.
请参考: http://forums.asp.net/t/1114649.aspx/1 [ ^ ]

I believe you get this error:
Unable to cast object of type ''System.Security.Principal.GenericIdentity'' to type ''System.Web.ClientServices.ClientFormsIdentity''

This will occur as long as you are not authenticated. To get the FormsIdentity you need to have been authenticated.
Refer: http://forums.asp.net/t/1114649.aspx/1[^]

上面的问题将是
无法将类型为"System.Security.Principal.GenericIdentity"的对象转换为类型为"System.Web.ClientServices.ClientFormsIdentity"."

以下线程也将非常有用，请检查此...
http://www.experts-exchange.com/Programming/Languages/C_Sharp/Q_22592880.html [ ^ ]

The above issue will be
"Unable to cast object of type ''System.Security.Principal.GenericIdentity'' to type ''System.Web.ClientServices.ClientFormsIdentity''."

The following thread will also be useful, Check this...
http://www.experts-exchange.com/Programming/Languages/C_Sharp/Q_22592880.html[^]

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