如何为查看状态分配dataview值 [英] How to Assign dataview value to view state

问题描述

如何将数据视图值分配给查看状态？

 datatable dt =  new  datatable（）
 DataView dvData =  new  DataView（dt ）; 
 dvData.RowFilter =条件; 
 
 ViewState [ViewStatedtName] = dvData; 

我收到错误。请帮助我。

解决方案

关注DataView未被标记为可序列化的内容 System.data是什么意思？ [ ^ ]。

这意味着您要存储的对象（DataView）没有标记为SerializableAttribute。



现在，您在使用ViewState而不是使用Session时出现此错误的原因是因为ViewState始终是序列化的，但对于Session来说并不一定如此。进程内会话存储在服务器的内存中，无需序列化。必须序列化SQLServer会话以存储在数据库中。



因此，无论何时想要在ViewState（或序列化会话）中存储对象，它都必须是标有Seri​​alizableAttribute。

和 viewview中的dataview [ ^ ]

而不是将dataview放到viewstate，把 dataview.Table 到viewstate。它会解决你的问题。

 DataView dv = ds.Tables [ 0 ]。DefaultView; 
 ViewState.Add（  key，dv.Table）; 

而不是将dataview放到viewstate，把dataview.Table放到viewstate。

另外代码如果存在语法错误，请按以下方式进行操作。

ViewState [ViewStatedtName] = dvData;



如果上面的解决方案没有解决你的错误信息。

Hi,

How to assign dataview value to view state?

datatable dt=new datatable()
DataView dvData = new DataView(dt);
dvData.RowFilter = Condition;

ViewState[ViewStatedtName] = dvData;

I am getting error. Please help me.

解决方案

Follow What does "DataView is not marked as serializable in System.data" mean?[^].

It means that the object you want to store (DataView) isn''t marked with a SerializableAttribute.

Now, the reason you''re getting this error with ViewState and not with Session is because the ViewState is always serialized but that''s not necessarily true of Session. In-Process sessions are stored in the server''s memory and require no serialization. SQLServer sessions have to be serialized for storage in a database.

So, anytime you want to store an object in the ViewState (or a serialized Session), it must be marked with a SerializableAttribute.

and dataview in viewstate[^]

instead of putting dataview to viewstate, put dataview.Table to viewstate. It''ll resolve your problem.

DataView dv = ds.Tables[0].DefaultView;
ViewState.Add("key", dv.Table);

instead of putting dataview to viewstate, put dataview.Table to viewstate.
Also the code shouldfollow as below if there is a syntax error.
ViewState["ViewStatedtName"] = dvData;

If the above solution doesn''t resolve post ur error message .

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