检查DataGridView上的所有复选框项

问题描述

这里是场景，

我有复选框（名称：检查所有ID：chkItems）和datagridview。当我点击复选框。

我也在网格上添加了复选框列。

  DataGridViewCheckBoxColumn CheckboxColumn = new DataGridViewCheckBoxColumn（）; 
 CheckBox chk = new CheckBox（）; 
 CheckboxColumn.Width = 20; 
 GridView1.Columns.Add（CheckboxColumn）; 
  

这是复选框背后的代码。在行上有问题。

  private void chkItems_CheckedChanged（object sender，EventArgs e）
 {
 foreach（GridView1.Rows中的DataGridViewRow行）
 {
 DataGridViewCheckBoxCell chk = e.row.Cells（0）; 
 if（chk.Selected == false）
 {
 row.Cells（0）.Value = true; 
} 
} 
} 
  

SOLVED ）

  private void chkItems_CheckedChanged（object sender，EventArgs e）
 {
 foreach（GridView1中的DataGridViewRow行.Rows）
 {
 DataGridViewCheckBoxCell chk =（DataGridViewCheckBoxCell）row.Cells [1]; 
 if（chk.Selected == false）
 {
 chk.Selected = true; 
} 
} 
} 
  

解决方案>

  DataGridViewCheckBoxCell chk =（DataGridViewCheckBoxCell）row.Cells [0]; 
  

而不是

  DataGridViewCheckBoxCell chk = e.row.Cell（0）; 
  

* EDIT： *我想你真的想这样做： / p>

  foreach（dataGridView1.Rows中的DataGridViewRow行）
 {
 DataGridViewCheckBoxCell chk =（DataGridViewCheckBoxCell）row.Cells [0]; 
 chk.Value =！（chk.Value == null？false：（bool）chk.Value）; //因为chk.Value是initialy null 
} 
  

here's the scenario,

i have checkbox(Name:Check All ID:chkItems) and datagridview. And when i click on the checkbox. All checkbox on the gridview will also be checked.

I've also added the checkbox column on the grid.

DataGridViewCheckBoxColumn CheckboxColumn = new DataGridViewCheckBoxColumn();
            CheckBox chk = new CheckBox();
            CheckboxColumn.Width = 20;
            GridView1.Columns.Add(CheckboxColumn);

Here is the code behind of the checkbox. there is a problem on the row.Cell

private void chkItems_CheckedChanged(object sender, EventArgs e)
        {
            foreach (DataGridViewRow row in GridView1.Rows)
            {
                DataGridViewCheckBoxCell chk = e.row.Cells(0);
                if (chk.Selected == false)
                {
                    row.Cells(0).Value = true;
                }
            }
        }

SOLVED (here is the solution)

private void chkItems_CheckedChanged(object sender, EventArgs e)
        {
            foreach (DataGridViewRow row in GridView1.Rows)
            {
                DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell)row.Cells[1];
                if (chk.Selected == false)
                {
                    chk.Selected = true;
                }
            }
        }

解决方案

DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell) row.Cells[0];

instead of

DataGridViewCheckBoxCell chk = e.row.Cell(0);

*EDIT:*I think you really want to do this:

foreach (DataGridViewRow row in dataGridView1.Rows)
{
       DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell) row.Cells[0];
       chk.Value = !(chk.Value == null ? false : (bool) chk.Value); //because chk.Value is initialy null
}

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