blocks|key|5502948|text|DataGridViewCheckBoxCell+chk+=+(DataGridViewCheckBoxCell)+row.Cells[0];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|5502949|而不是|unstyled|5502950|DataGridViewCheckBoxCell+chk+=+e.row.Cell(0);|5502951|*EDIT：*我认为你真的想这么做：|offset|length|style|BOLD|5502952|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
}|5502953|entityMap^0|0|0|0|1|5|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|T|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|I|3|J|5|F|7|V|8|@$K|W|L|X|M|N]]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$B|C]]|$1|Q|3|-4|5|F|7|Z|8|@]|9|@]|A|$]]]|R|$]]

<pre><code>DataGridViewCheckBoxCell chk = (DataGridViewCheckBoxCell) row.Cells[0];
</code></pre>

instead of 

<pre><code>DataGridViewCheckBoxCell chk = e.row.Cell(0);
</code></pre>

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

<pre><code>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
}
</code></pre>

blocks|key|5503042|text|++++private+void+setCheckBoxInDataGrid(DataGridView+dgv,+int+pos,+bool+isChecked)
++++{
++++++++for+(int+i+=+0;+i+<+dgv.RowCount;+i%2B%2B)
++++++++{
++++++++++++dgv.Rows[i].DataGridView[pos,+i].Value+=+isChecked;
++++++++}
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|5503043|我就是这么做的|unstyled|5503044|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code> private void setCheckBoxInDataGrid(DataGridView dgv, int pos, bool isChecked)
 {
 for (int i = 0; i &lt; dgv.RowCount; i++)
 {
 dgv.Rows[i].DataGridView[pos, i].Value = isChecked;
 }
 }
</code></pre>

This is how I did it

blocks|key|5503046|text|试试这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5503047|foreach+(DataGridViewRow+row+in+this.dataGridView1.Rows)
{
++++++row.Cells[0].Value+=+row.Cells[0].Value+==+false+?+true+:+false;

}|code-block|syntax|javascript|5503048|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this one

<pre><code>foreach (DataGridViewRow row in this.dataGridView1.Rows)
{
 row.Cells[0].Value = row.Cells[0].Value == false ? true : false;

}
</code></pre>

blocks|key|3775153|text|如果你可以自己给checkboxes+of+datagridview提供一个默认状态，也就是True或FalseDo，不要分配一个空状态(这样做的原因将在后者中解释)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3775154|这可以通过以下代码来完成(当您搜索要在DataGridView中查看的结果时，请键入此代码)|3775155|dgv是您正在使用的DataGridView的对象。|3775156|for+(int+i+=+0;+i+<+dgv.RowCount+-+1;+i%2B%2B)
{
+++++dgv.Rows[i].DataGridView[0,+i].Value+=+true;
}|code-block|syntax|javascript|3775157|其中DataGridView[0,+i]表示第0列，第1行|3775158|这样做的原因是，在加载时，复选框默认处于null状态。代码未比较null状态(创建对象空引用异常)。所以，当你给它赋值为false或true时。它永远不会进入null状态。|3775159|在将要用来检查的button_click_event中键入以下代码|3775160|for+(int+i+=+0;+i+<+dgv.RowCount-1;+i%2B%2B)
{
++++if+(dgv.Rows[i].Cells[0].Value.ToString()+!=+"")
++++{
++++++++dgv.Rows[i].Cells[0].Value+=+false;
++++}
++++else
++++{
++++++++dgv.Rows[i].Cells[0].Value+=+true;
++++}
}|3775161|它对我有效，我希望它对你也有效。|3775162|entityMap^0|8|Q|0|J|C|0|0|3|A|C|0|0|2|I|0|K|4|W|4|27|4|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|J|3|K|5|L|7|1B|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1C|8|@$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1F|8|@$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|S|3|T|5|6|7|1M|8|@]|D|@]|E|$]]|$1|U|3|V|5|L|7|1N|8|@]|D|@]|E|$M|N]]|$1|W|3|X|5|6|7|1O|8|@]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|1P|8|@]|D|@]|E|$]]]|Z|$]]

If you are okay with providing a default state to the <code>checkboxes of datagridview</code> on your own i.e either True or False[Do not assign a null state] state(Reason for doing this would be explained in the latter).

Which could be done by the following code,(type in this code when you search for results to be viewed in <code>DataGridView</code>) 
<code>dgv</code> is the object of the <code>DataGridView</code> that you are using.

<pre><code>for (int i = 0; i &lt; dgv.RowCount - 1; i++)
{
 dgv.Rows[i].DataGridView[0, i].Value = true;
}
</code></pre>

Where <code>DataGridView[0, i]</code> indicates 0th column ith row 
The Reason for doing this is,On load the checkbox is by default in a <code>null</code> state. The code isn't comparing for <code>null</code> state(Creating a object null reference exception). So, once when u assign it a state either a false or true . It can never undergo into <code>null</code> state. 
Type in the following code inside the button_click_event using which you are going to check

<pre><code>for (int i = 0; i &lt; dgv.RowCount-1; i++)
{
 if (dgv.Rows[i].Cells[0].Value.ToString() != "")
 {
 dgv.Rows[i].Cells[0].Value = false;
 }
 else
 {
 dgv.Rows[i].Cells[0].Value = true;
 }
}
</code></pre>

It Worked for me, I hope it does for you.

blocks|key|3291723|text|我试着选择所有的复选框或选择它的相互性，并计算一些value...so写的代码，这可能是有帮助的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3291724|foreach+(DataGridViewRow+item+in+DGDoc.Rows)
{
++++if+(item.Cells[0].Value+==+null)
++++++++item.Cells[0].Value+=+"True";
++++if+(bool.Parse(item.Cells[0].Value.ToString()))
++++{
++++++++item.DefaultCellStyle.BackColor+=+System.Drawing.Color.FromArgb(241,+215,+215);
++++++++strIDs+%2B=+","+%2B+item.Cells[1].Value.ToString();
++++++++intSumPrice+%2B=+Int64.Parse(item.Cells[4].Value.ToString());
++++++++intSumTax+%2B=+Int64.Parse(item.Cells[5].Value.ToString());
++++++++intSumPay+%2B=+Int64.Parse(item.Cells[6].Value.ToString());
++++}
++++else
++++{
++++++++item.DefaultCellStyle.BackColor+=+System.Drawing.Color.Empty;
++++}
}
DGDoc.EndEdit();|code-block|syntax|javascript|3291725|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I tried to select all checkbox or select it mutuality and calculate some value...so wrote this code that's maybe helpful.

<pre><code>foreach (DataGridViewRow item in DGDoc.Rows)
{
 if (item.Cells[0].Value == null)
 item.Cells[0].Value = "True";
 if (bool.Parse(item.Cells[0].Value.ToString()))
 {
 item.DefaultCellStyle.BackColor = System.Drawing.Color.FromArgb(241, 215, 215);
 strIDs += "," + item.Cells[1].Value.ToString();
 intSumPrice += Int64.Parse(item.Cells[4].Value.ToString());
 intSumTax += Int64.Parse(item.Cells[5].Value.ToString());
 intSumPay += Int64.Parse(item.Cells[6].Value.ToString());
 }
 else
 {
 item.DefaultCellStyle.BackColor = System.Drawing.Color.Empty;
 }
}
DGDoc.EndEdit();
</code></pre>

blocks|key|3775265|text|1-创建新按钮。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3775266|2-您可以在单击checkAll按钮时使用以下代码|3775267|3-当点击按钮时，它将选中datagridview中的所有复选框，再次单击时，它将取消选中所有复选框。|3775268|private+void+btncheckall_Click(object+sender,+EventArgs+e)
++++++++{
++++++++++++foreach+(DataGridViewRow+row+in+dgvResult.Rows)
++++++++++++{
++++++++++++++++row.Cells[0].Value+=+row.Cells[0].Value+==+null+?+false+:+!(bool)row.Cells[0].Value;
++++++++++++}
++++++++}|code-block|syntax|javascript|3775269|注意:在某些情况下，您必须先在datagridview中单击，然后再单击按钮。|3775270|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|R|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

1- Create new button.

2- You can use the following code when click checkAll button 

3- when click the button it will check all checkboxes in datagridview and when click again it will uncheck all boxes.

<pre><code>private void btncheckall_Click(object sender, EventArgs e)
 {
 foreach (DataGridViewRow row in dgvResult.Rows)
 {
 row.Cells[0].Value = row.Cells[0].Value == null ? false : !(bool)row.Cells[0].Value;
 }
 }
</code></pre>

Note: in some cases you have to click in datagridview first then click the button.

blocks|key|5414060|text|您可以像这样检查所有单元格：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5414061|private+void+CheckAllCheckboxItemsOnDataGridView(int+columnIndex)
{+
++++foreach+(DataGridViewRow+row+in+dgFiles.Rows)
++++{
++++++++DataGridViewCheckBoxCell+cell+=+(DataGridViewCheckBoxCell)row.Cells[columnIndex];

++++++++cell.Value+=+!(cell.Value+==+null+?+false+:+(bool)cell.Value);+
++++}
}|code-block|syntax|javascript|5414062|您可以在CheckedChanged事件中使用方法，如下所示：|5414063|private+void+chkItems_CheckedChanged(object+sender,+EventArgs+e)
{
++++CheckAllCheckboxItemsOnDataGridView(columnIndex:+0);
}|5414064|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You can check all cells like this:

<pre><code>private void CheckAllCheckboxItemsOnDataGridView(int columnIndex)
{ 
 foreach (DataGridViewRow row in dgFiles.Rows)
 {
 DataGridViewCheckBoxCell cell = (DataGridViewCheckBoxCell)row.Cells[columnIndex];

 cell.Value = !(cell.Value == null ? false : (bool)cell.Value); 
 }
}
</code></pre>

You can use method in CheckedChanged event like this:

<pre><code>private void chkItems_CheckedChanged(object sender, EventArgs e)
{
 CheckAllCheckboxItemsOnDataGridView(columnIndex: 0);
}
</code></pre>

Here's the scenario.

I have <code>checkbox</code>(Name:"Check All" ID:chkItems) and <code>datagridview</code>. And when I click on this checkbox, all checkboxes on the <code>datagridview</code> will also be checked.

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

<pre><code>DataGridViewCheckBoxColumn CheckboxColumn = new DataGridViewCheckBoxColumn();
CheckBox chk = new CheckBox();
CheckboxColumn.Width = 20;
GridView1.Columns.Add(CheckboxColumn);
</code></pre>

Here is the code behind of the checkbox. There is a problem on the <code>row.Cell</code>

<pre><code>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;
 }
 }
} 
</code></pre>

Check All Checkbox items on DataGridView

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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这是一个场景。我有checkbox(名称：“全部检查”ID:chkItems)和datagridview。当我单击此复选框时，datagridview上的所有复选框也将被选中。我还在网格上添加了复选框列。DataGridViewCheckBoxColumn CheckboxColumn = new DataGridViewCheckBoxColumn();CheckBox chk = new Ch

问选中DataGridView上的所有复选框项目
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回答 7

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问选中DataGridView上的所有复选框项目
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