Question

我有一个DataGridView。我正在使用数据源绑定DataGridBiew，如下所示......

  private void form_load(object sender, eventargs e)
  {
         var members = xyz.members(..
                         select new {
                            blah....
                               blahh...
                             });
         memberbindingsource.datasource = members
         membergridview1.datasource = memberbindingsource;

         // at here i have added button column to membergridview 1 
         // like this....
         DataGridViewButtonColumn column = new DataGridViewButtonColumn();
         membergridview1.Columns.Add(column);
         column.FlatStyle = FlatStyle.Standard;
         column.DefaultCellStyle.BackColor = Color.Green;
         column.Text = "ADD";
         column.HeaderText = "Add";
         column.UseColumnTextForButtonValue = true;
         column.Name = "btnadd";

这在表单加载时工作正常但在某处我检查组合框中的条件，如此

            if(combobox1.text == "abc")
            {

                   then  i have to loaded the grid view again 
                    like this ...
                     var members = xyz.members(..
                         select new {
                            blah....
                               blahh...
                             });
                         memberbindingsource.datasource = members
                         membergridview1.datasource = memberbindingsource;

     at here i have added button column to membergridview 1 
        like this....
        DataGridViewButtonColumn column = new DataGridViewButtonColumn();
       membergridview1.Columns.Add(column);
        column.FlatStyle = FlatStyle.Standard;
        column.DefaultCellStyle.BackColor = Color.Green;
        column.Text = "ADD";
        column.HeaderText = "Add";
        column.UseColumnTextForButtonValue = true;
        column.Name = "btnadd";

      }

当第一次选择combobox1文本“abc”时，datagridview显示的按钮列很好......

当我检查第一个条件（如此combobox1.text == "abc"）时，DataGridView显示详细信息，但如果再次检查相同条件，它将再次添加按钮列。

当我一次又一次地检查相同的条件时，我想只显示一个带有成员数据的按钮列。

如何防止这种情况 - 不要一次又一次地增加按钮列？

Answer 1

这是因为每次加载页面时都会添加此列。因此，无论是新电话还是回拨电话，都会添加此列。要正确完成此工作，请附上在以下条件

中添加列的代码段

if (!IsPostBack)
    {
        //add your column add code snippet here 

    }

所以你的代码看起来像这样

if (!IsPostBack)
    {
        DataGridViewButtonColumn column = new DataGridViewButtonColumn();
       membergridview1.Columns.Add(column);
        column.FlatStyle = FlatStyle.Standard;
        column.DefaultCellStyle.BackColor = Color.Green;
        column.Text = "ADD";
        column.HeaderText = "Add";
        column.UseColumnTextForButtonValue = true;
        column.Name = "btnadd";
    }

如何防止DataGridView列增加

1 个答案: