嗨，大家好我在C＃中创建动态控件，我遇到了删除功能的问题。 [英] Hi Guys I Am Creating Dynamic Controlls In C#, I Got Problems With My Remove Function.

问题描述

我正在创建一个文本框，下拉列表和一个按钮，我想点击一个按钮删除该行。我尝试了不同的东西，但我无法让它工作，我最接近的是删除最后一行。这里是我的代码。



这里是创建控件

i am making a textbox, dropdown and a button and i want to make whn i click a button it removes that row. I have tried different thing but i can't get it to work, the closest i have been is removing last row. here my code.

here is were creating the controlls

int rowCount = Convert.ToInt32(txtDeltager.Text);
      for (int i = 0; i < rowCount; i++)
      {

          int count = int.Parse(hdnCount.Value);
          count++;
          hdnCount.Value = count.ToString();

          TextBox tb = new TextBox();
          tb.ID = "txtbox" + count.ToString();
          tb.Width = 200;
          tb.CssClass = "txtPas";
          DropDownList ddl = new DropDownList();
          ddl.ID = "ddl" + count.ToString();
          ddl.CssClass = "ddlpas";
          Button btnRe = new Button();
          btnRe.Text = "Slet";
          btnRe.ID = "btnRe" + count.ToString();


          TableRow tr = new TableRow();
          TableCell tc = new TableCell();


          tc.Controls.Add(tb);
          tc.Controls.Add(ddl);
          tc.Controls.Add(btnRe);
          tr.Cells.Add(tc);
          tblMain.Rows.Add(tr);
          btnRe.Click += delegate
          {

              // NOTE: The code below here were i try to make a remove function

              for (i = 0; i <= rowCount; i--)
              {

                  if (tblMain.Controls.Contains(tr))
                  {

                      tblMain.Controls.Remove(tr);
                      tr.Dispose();

                  }
              }


          };

和代码是我重新创建控件所以我保持viewState

and the code were i recreating the controls so i keep the viewState

// Recreate the textboxes on each postback
       for (int i = 2; i <= count; i++)
       {
           TextBox tb = new TextBox();
           tb.ID = "txtbox" + i.ToString();
           tb.Width = 200;
           tb.CssClass = "txtPas";
           tb.Text = Request.Form["txtbox" + i.ToString()];
           DropDownList ddl = new DropDownList();
           ddl.ID = "ddl" + i.ToString();
           ddl.CssClass = "ddlpas";
           Button btnRe = new Button();
           btnRe.Text = "Slet";
           btnRe.ID = "btnRe" + i.ToString();



           TableRow tr = new TableRow();
           TableCell tc = new TableCell();


           tc.Controls.Add(tb);
           tc.Controls.Add(ddl);
           tc.Controls.Add(btnRe);
           tr.Cells.Add(tc);
           tblMain.Rows.Add(tr);
           btnRe.Click += delegate
           {
               // NOTE: The code below here were i try to make a remove function
               for (i = 2; i <= count; i--)
               {

                   if (tblMain.Controls.Contains(tr))
                   {

                       tblMain.Controls.Remove(tr);
                       tr.Dispose();

                   }
               }
           };

推荐答案

如果你想要删除某些东西，你必须采取相反的方式而不是创建。

在你的情况下：

- 从Button中删除处理程序（委托）（btnRe）

- 从控件集合中删除并处理控件tc

- 从tr中移除tc



如果你这样做它会起作用。

用于实现这样的代码我更喜欢创建一个方法CreateControls和另一个方法RemoveControls。这样会更清楚。

If you want to remove something you have to do it the other way round than creating.
In your case :
- remove the handler (delegate) from the Button (btnRe)
- remove and dispose the controls out of the controls-collection from tc
- remove tc from tr

If you do it like this it will work.
For realizing such code I would prefer to create a method "CreateControls" and another method "RemoveControls". That would be clearer arranged.

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