无法投放错误.... [英] Unable to cast error....

问题描述

GridView控件验证存在一些问题.我在GridView的所有行的第一列中都有Asp CheckBox，我需要删除通过CheckBox选择的所有行.
所以我必须检查是否使用(CheckBox)选择了该行.但是，当我在运行时捕获结果以检查其是否已检查时，我得到了一个错误.在将布尔结果捕获到(bool b)时引发错误

无法将类型为"System.Web.UI.LiteralControl"的对象转换为类型为"System.Web.UI.WebControls.CheckBox".

我使用的代码是:

Hi,

I have some problem with GridView Control validations. I have Asp CheckBox at first column in all the rows of my GridView, I need to delete all the rows which are selected through CheckBox.
So i have to check whether the row is selected or not using (CheckBox). But when i am catching the result at runtime to check whether its checked or not, i am getting an error. The error is raised at catching the boolean result to (bool b)

Unable to cast object of type ''System.Web.UI.LiteralControl'' to type ''System.Web.UI.WebControls.CheckBox''.

The code i used is:

bool b = ((CheckBox)GridView1.Rows[i].Cells[0].Controls[0]).Checked;
if(b)
{ 
   string strid=(string)GridView1.Rows[i].Cells[1].Text; 
  cusidlist.Add(strid);
}

谢谢.....

Thanks.....

推荐答案

sarath.mk写道:

sarath.mk wrote:

无法将类型为"System.Web.UI.LiteralControl"的对象转换为类型为"System.Web.UI.WebControls.CheckBox".

Unable to cast object of type ''System.Web.UI.LiteralControl'' to type ''System.Web.UI.WebControls.CheckBox''.

错误是不言自明的.在创建网格时，已使用文字控件显示为复选框.现在，在获取值的同时，您尝试将该控件转换为复选框.

解决方案:
只需将其转换为用于创建它的控件类型即可.

Error is self-explanatory. You have used a Literal Control to present as checkbox while creating the grid. Now, while getting the values you are trying to cast that control into checkbox.

Solution:
Just cast it into the same control-type that you used to create it.

您不能将另一个控件转换为复选框.
您需要确保GridView1.Rows[i].Cells[0].Controls[0])是一个复选框.

You cannot convert another control to a checkbox.
You need to make sure GridView1.Rows[i].Cells[0].Controls[0]) is a checkbox.

Hai Sandeep Mewara，

您能否解释如何创建文字控件并将类型转换为相同的文字控件.我尝试了一下，但是无法在该行代码中将其转换为文字控制.您能否为此发送代码.

在此先感谢.....

Hai Sandeep Mewara,

Can u pls explain how to create a literal control and to type cast the result to the same literal control. I tried it but not able to cast to literal control at that line of code. Can u pls send code for that.

Thanks in Advance.....

这篇关于无法投放错误....的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！