根据数据表值为特定行Gridview启用Linkbutton [英] Enable Linkbutton for a specific row Gridview based on datatable value

问题描述

我有一个绑定到Gridview的数据表。现在在数据表中，如果列[文件]具有文件名，则在Gridview中为该相应行启用链接按钮，如果列[文件]没有文件名，则禁用Gridview中该行的链接按钮。



这是我试过的东西

I have a Datatable that is binding to Gridview. Now in that Datatable if a column["File"] has File name then Enable linkbutton for that respective row in Gridview, if column["File"] doesn't have Filename then disable Linkbutton of that row in Gridview.

Here is what I tried

Protected Sub gdvLineItems_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs)
     Dim rowIndex As Integer = 0
     If (e.Row.RowType = DataControlRowType.DataRow) Then

         Dim dt As DataTable = ViewState("Grid")

         For i As Integer = 1 To dt.Rows.Count
            Dim lnk As LinkButton = DirectCast(e.Row.FindControl("btndownload"), LinkButton)
             If Not dt.Rows(rowIndex)("File") Is String.Empty Then
                 lnk.Enabled = True
             Else
                 lnk.Enabled = False
             End If

             rowIndex += 1
         Next

     End If
 End Sub

注意：每次有人输入数据时，我的数据表都会更新，每行都附加到Gridview。

Note: My Datatable gets updated each time someone enters data, and each row is appended to Gridview.

推荐答案

在Linkbutton转换行上放置断点并查看。字符串的常见问题是可能发生的多种事情。您正在测试空字符串/零长度字符串。可以为null，可以是空格等。使用带断点的locals窗口或只在代码中将属性赋值给字符串。必须确定你拥有的东西。

Put breakpoint on Linkbutton cast row and have a look. Also common problem with strings is the multiple things that can happen. You are testing for empty string/zero length string. Could be null, could be space, etc. Use locals window with breakpoint or just assign property to string in code. Must be sure what you have.

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