Gridview文本框在'findcontrol'上返回NULL值

问题描述

我有一个gridview，文本框模板字段在代码后面动态添加，输入值到文本框。在获取文本框值时，它返回空。



以下代码我试图获得价值。



'***我输入你好值在执行下面的代码之前在文本框控件中。

i have a gridview with text box template field added dynamically in code behind, entered value to text box. While fetching the text box value, it's returning empty.

Below code i tried to get value.

'*** I entered "Hello" value in text box control before executing below code.

For Each row As GridViewRow In GridviewChild.Rows

            Dim tbSigningGroup As TextBox = DirectCast(row.Cells(4).FindControl("tbSigningGroup" + CStr(row.RowIndex)), TextBox)

            If Not tbSigningGroupIs Nothing Then
                Dim temp As String = tbSigningGroup.Text  ' ****** Returns NULL*******
            End If

Next

'****任何建议，我在哪里做错了？



我尝试过：



我使用CurrentRow.FindControl（ControlID）方法获取值，但仍然我得到空字符串作为返回值。

'****Any suggestions, where am i doing wrong?

What I have tried:

I used CurrentRow.FindControl("ControlID") method to get the value, but still i am getting empty string as return value.

推荐答案

 Dim Lbl_Control As Label= CType(row.FindControl("Label1"), Label)
// button click as usual, just get and check the value of Label control, rather than TextBox control.

Protected Sub B_Load_Click(ByVal sender As Object, ByVal e As EventArgs) '(sender As
                           Object, e As System.EventArgs) Handles B_Load.Click
    Dim FullText As String = ""
    For Each row As GridViewRow In GV_Comments.Rows
        Dim CB_Control As CheckBox = CType(row.FindControl("Comment_Select"),
                                           CheckBox)
        Dim Lbl_Control As Label= CType(row.FindControl("Label1"), Label)
        If CB_Control IsNot Nothing AndAlso CB_Control.Checked AndAlso Lbl_Control
           IsNot Nothing Then
            FullText = FullText &  Lbl_Control.Text & "<br/>"
        End If
    Next row
    CompiledText.Text = FullText.ToString
End Sub

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