C＃ - 无法在gridview中读取动态创建的文本框 [英] C# - cannot read dynamically created textbox in gridview

问题描述

嗨
我在gridview中以编程方式创建文本框。但是我无法从文本框中获取值。



我有一个文本框，我可以在其中获取要创建的行数并按下Go 按钮，它用动态创建的文本框填充gridview。



我需要读取gridview文本框中的值，这就是我被卡住的地方。



我的网格视图：

< asp：GridView ID =gvPlanrunat =server ShowFooter =TrueAutoGenerateColumns =true> 
< Columns> 
< / Columns> 
< / asp：GridView> 

代码页：

 protected void btnGo_Click（object sender，EventArgs e）
 {
 Insert_Grid（）; 
} 
 
 private void Insert_Grid（）
 {
 CreateGridView（）; 
 int numbers = int.Parse（txtRows.Text.Trim（））; 
 int cellCount = gvPlan.Rows [0] .Cells.Count; 
 int rowsCount = gvPlan.Rows.Count; 
 foreach（gvPlan.Rows中的GridViewRow行）
 {
 //文本框 -  ID 
 TextBox txtID = new TextBox（）; 
 txtID.ID =tID+（Convert.ToInt32（row.RowIndex + 1））。ToString（）; 
 txtID.Attributes.Add（runat，server）; 
 row.Cells [1] .Controls.Add（txtID）; 
 
 //文本框 - 名称
 TextBox txtName = new TextBox（）; 
 txtName.ID =tName+（Convert.ToInt32（row.RowIndex + 1））。ToString（）; 
 txtName.Attributes.Add（runat，server）; 
 txtName.Attributes.Add（ReadOnly，true）; 
 row.Cells [2] .Controls.Add（txtName）; 
} 
} 
 
 private void CreateGridView（）
 {
 int numbers = int.Parse（this.txtRows.Text.Trim（））; 
 DataTable dt = new DataTable（）; 
 dt.Columns.Add（ID，typeof（string））; 
 dt.Columns.Add（Name，typeof（string））; 
 
 for（int i = 0; i< numbers; i ++）
 {
 dt.Rows.Add（，）; 
} 
 ViewState [CurrentTable] = dt; 
 gvPlan.DataSource = dt; 
 gvPlan.DataBind（）; 
} 
 
 protected void btnSave_Click（object sender，EventArgs e）
 {
 int rowIndex = 0; 
 if（ViewState [CurrentTable]！= null）
 {
 DataTable dtCurrentTable =（DataTable）ViewState [CurrentTable]; 
 if（dtCurrentTable.Rows.Count> 0）
 {
 for（int i = 1; i< = dtCurrentTable.Rows.Count; i ++）
 {
 //提取TextBox值
 TextBox gtxtID =（TextBox）gvPlan.Rows [rowIndex] .Cells [1] .FindControl（tID+（rowIndex + 1））; 
 TextBox gtxtName =（TextBox）gvPlan.Rows [rowIndex] .Cells [2]。.FindControl（tName+（rowIndex + 1））; 
 gtxtName.Text = gtxtID.Text; 
 rowIndex ++; 
} 
} 
} 

问题出现在btnSave_Click程序中，我似乎没有从gtxtID获取值。它找不到文本框控件，对象为空



非常感谢您的帮助。



问候

Ilyas



我的尝试：



按代码尝试调试代码但是徒劳无法

解决方案

这里的答案可能会有所帮助：如何在gridview中读取动态创建的文本框 [ ^ ]

Hi I 'm programatically creating text boxes in gridview. But I'm unable to get the value from the text box.

I have a text box where i get the number of rows to be created and on pressing "Go" button, it populates gridview with dynamically created text boxes.

I need to read the values from gridview text boxes and this is where i got stuck.

My Gridview:

<asp:GridView ID="gvPlan" runat="server" ShowFooter="True" AutoGenerateColumns="true">
<Columns>
</Columns>
</asp:GridView>

Code Page:

protected void btnGo_Click(object sender, EventArgs e)
{
   Insert_Grid();
}

private void Insert_Grid()
{
   CreateGridView();
   int numbers = int.Parse(txtRows.Text.Trim());
   int cellCount = gvPlan.Rows[0].Cells.Count;
   int rowsCount = gvPlan.Rows.Count;
   foreach (GridViewRow row in gvPlan.Rows)
   {
      // text box - ID
    TextBox txtID = new TextBox();
    txtID.ID = "tID" + (Convert.ToInt32(row.RowIndex + 1)).ToString();
    txtID.Attributes.Add("runat", "server");
    row.Cells[1].Controls.Add(txtID);

      // text box - NAME
    TextBox txtName = new TextBox();
    txtName.ID = "tName" + (Convert.ToInt32(row.RowIndex + 1)).ToString();
    txtName.Attributes.Add("runat", "server");
    txtName.Attributes.Add("ReadOnly", "true");
    row.Cells[2].Controls.Add(txtName);
   }
}

private void CreateGridView()
{
   int numbers = int.Parse(this.txtRows.Text.Trim());
   DataTable dt = new DataTable();
   dt.Columns.Add("ID", typeof(string));
   dt.Columns.Add("Name", typeof(string));
   
   for (int i = 0; i < numbers; i++)
   {
      dt.Rows.Add("", "");
   }
   ViewState["CurrentTable"] = dt;
   gvPlan.DataSource = dt;
   gvPlan.DataBind();
}

protected void btnSave_Click(object sender, EventArgs e)
{
   int rowIndex = 0;
   if (ViewState["CurrentTable"] != null)
   {
      DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
      if (dtCurrentTable.Rows.Count > 0)
      {
        for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
        {
          //extract the TextBox values
          TextBox gtxtID = (TextBox)gvPlan.Rows[rowIndex].Cells[1].FindControl("tID" + (rowIndex+1));
          TextBox gtxtName = (TextBox)gvPlan.Rows[rowIndex].Cells[2].FindControl("tName" + (rowIndex + 1));
           gtxtName.Text = gtxtID.Text;
          rowIndex++;
        }
    }
}

The issue is in "btnSave_Click" procedure where i dont seem to get the value from gtxtID. It cannot find the text box control and the object is null

Your help is much appreciated.

Regards
Ilyas

What I have tried:

Tried debugging code by code but in vain

解决方案

Maybe the answers here will be of help: How can i read a dynamically created textbox in gridview[^]

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