如何在网格视图的RowCommand方法中找到标签控件? [英] How to find label control in the RowCommand method of grid view?

问题描述

GridViewRow clickedRow = ((LinkButton)sender).NamingContainer as GridViewRow;
Label lblUser = clickedRow.FindControl("lblFullName") as Label;
Label lblUserId = (Label)clickedRow.FindControl("lblUserId");

编译器抛出错误

无法投射类型为'System.Web.UI.WebControls.GridView'的对象

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

推荐答案

当前代码的问题是GridView的RowCommand事件是由gridview本身而不是由单个控件引发的，因此您的转换将失败:-

The problem with your current code is that the GridView's RowCommand event is raised by gridview itself and not by an individual control thus your cast will fail:-

(LinkButton)sender

因为这里的发件人是Gridview，而不是linkbutton.

Because sender here is Gridview and not linkbutton.

现在，您的gridview中可能有多个控件，这些控件可以引发此事件(或者您将来可以添加它们)，因此可以在LinkBut​​ton中添加一个CommandName属性，如下所示:-

Now, you may have multiple controls in your gridview which can raise this event(or you may add them in future) so add a CommandName attribute to your LinkButton like this:-

<asp:LinkButton ID="myLinkButton" runat="server" Text="Status" 
     CommandName="myLinkButton"></asp:LinkButton>

最后，在RowCommand事件中，您可以先检查事件是否由LinkButton引发，然后安全地使用将为LinkButton的e.CommandSource属性，然后从中找到Gridview的包含行.

Finally in the RowCommand event you can first check if the event is raised by the LinkButton and then safely use the e.CommandSource property which will be a LinkButton and from there find the containing row of Gridview.

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
   if (e.CommandName == "myLinkButton")
   {
      LinkButton lnk = (e.CommandSource) as LinkButton;
      GridViewRow clickedRow = lnk.NamingContainer as GridViewRow;
   }
}

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