在datagrid c#中更改按钮文本

Question

我有一些数据的datagridview，我在这个网格中添加了一个按钮（列），稍后再用它做某事。

//------------------- definitions
DataTable datatable = new DataTable("Points");
this.DATAGRID.DataSource = datatable; //connect data to DATAGRID set in designer

//adding button column
if (DATAGRID.Columns.Contains("Button_column") == false) //I want to add button column only once
{ 
    DataGridViewButtonColumn button_column = new DataGridViewButtonColumn();
    button_column.HeaderText = "ON/OFF";
    button_column.Text = "Click";
    button_column.Name = "Button_column";
    button_column.UseColumnTextForButtonValue = true;
    DATAGRID.Columns.Add(button_column);
}    

//add next columns
datatable.Columns.Add("id", typeof(int));
datatable.Columns.Add("Date", typeof(string));
datatable.Columns.Add("Point", typeof(string));
datatable.Columns.Add("Status", typeof(string));

//set order for the user
DATAGRID.Columns["id"].DisplayIndex = 0; //will need id later
DATAGRID.Columns["id"].Visible = false; //but I hide it from user
DATAGRID.Columns["Date"].DisplayIndex = 1;
DATAGRID.Columns["Point"].DisplayIndex = 2;
DATAGRID.Columns["Status"].DisplayIndex = 3;
DATAGRID.Columns["Button_column"].DisplayIndex = 4;

//------------------- data
int i = 0;
while (r_dane_kontroli.Read())
{

    //I add data here
    datatable.Rows.Add(1, "Date", "Point"); //adding value to the button here won't work (error "to many columns")

    //I TRY TO CHANGE BUTTON TEXT HERE - IN THE LOOP
    //this doesn't work no matter if I adress the row or cell via index or name (tried other indexes too...)
    if(status == "ON")
        DATAGRID.Rows[i].Cells[0].Value = "OFF";
    if(status == "OFF")
        DATAGRID.Rows[i].Cells[0].Value = "ON";

    i++;
}

没有错误。它根本行不通。我不想在这个之后创建额外的循环。

不管我是像上面那样以编程方式添加按钮列，还是通过设计器添加按钮列。效果是一样的。有什么解决办法吗？

Answer 1

您的代码不是很清楚，但我会根据我对您问题的理解尝试给您一个解决方案。

如果您需要为按钮设置不同的文本，可以使用DataGridView 的CellFormatting 事件并设置这些单元格的值：

private void DATAGRID_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{ 
    //// If this is a new header row or row, do nothing
    if (e.RowIndex < 0 || e.RowIndex == this.DATAGRID.NewRowIndex)
        return;

    //If your column type button is 0, you must validate this
    if (e.ColumnIndex == 0)
    {
        string status = DATAGRID.Rows[e.RowIndex].Cells["Status"].Value.ToString();

        if (status.Equals("ON"))  
            e.Value = "OFF"; 
        else 
            e.Value = "ON";
    }
}

您必须将此驱动程序分配给CellFormatting 事件：

this.DATAGRID.CellFormatting += DATAGRID_CellFormatting;