问题描述
我已绑定一个数据表到 DataGridView的
,这个数据表有一个名为状态列是类型布尔
。我可以将值设置为真正
或假
通过代码就好了。
不过,我无法弄清楚如何检查,看看是否给定的行已经被选中。这是我想使用和编译它显示错误指定的强制转换无效的代码。
任何帮助,将不胜感激。
如果(rowIndex位置> = 0)
{
VAR cbxCell =(DataGridViewCheckBoxCell)dgvScan.Rows [rowIndex位置] .Cells [ 状态];
如果((布尔)cbxCell.Value)
{
//做的东西
}
,否则
{
/ /做其他的东西
}
}
问题是,对于一个DataGridCheckBoxColumn默认FALSE值为null,并且默认TRUE值为True布尔值。这会导致一个问题,因为布尔值不为空。你能解决这个问题的方法有两种:!
如果(cbxCell.Value = NULL&放大器;及(布尔)cbxCell.Value )
{
做的东西;
}
另一种方式来解决这个设置列的TrueValue属性一些值。这可以在设计时进行,如下所示:
然后,你可以写:
如果((字符串)cbxCell.Value ==T)
{
做的东西;
}
这工作,因为字符串是空。
请注意:即使我设置FalseValue为f假值似乎仍然是空的,所以我建议忽略了FalseValue财产
另一个注意:如果你把东西TrueValue如上然后学尝试删除它,真值变为零(哎哟),requireing您删除列,然后才能将其恢复到初始状态重新添加它。或者你可以在代码如下更改:
((DataGridViewCheckBoxColumn)DataGridView1.Columns [选择])TrueValue =真正的
I have bound a data table to a DataGridView
, this data table has a column called "Status" which is of type Boolean
. I can set the value to true
or false
just fine via code.
However, I can't figure out how to check to see if the given row is already checked or not. This is the code I am trying to use and compiling it shows the error "the specified cast is invalid".
Any help would be appreciated.
if (rowIndex >= 0)
{
var cbxCell = (DataGridViewCheckBoxCell)dgvScan.Rows[rowIndex].Cells["Status"];
if ((bool)cbxCell.Value)
{
// Do stuff
}
else
{
// Do other stuff
}
}
The problem is that the default FALSE value for a DataGridCheckBoxColumn is null, and the Default TRUE value is the boolean value True. This causes a problem because boolean values are not nullable. You can solve this problem two ways:
if (cbxCell.Value != null && (bool)cbxCell.Value)
{
do stuff;
}
The other way to solve this is set the TrueValue property of the column to some value. This can be done at design time as shown:
Then you can write:
if ((string)cbxCell.Value == "T")
{
do stuff;
}
This works because Strings are nullable.
Please note: Even though I set the FalseValue to be F the false value still seems to be null, so I suggest ignoring the FalseValue property.
One other note: IF you put something in TrueValue as above and then attemp to erase it, True value becomes null (ouch), requireing you to delete the column and then re-add it in order to restore it to the default condition. Or you can change it in code as follows:
((DataGridViewCheckBoxColumn)DataGridView1.Columns["Selected"]).TrueValue = true
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