我为从 DataGridViewColumn、DataGridViewTextBoxCell 派生的 datagridview 创建了一个自定义列,并实现了 IDataGridViewEditingControl。
我创建了一个用户控件,其中包含一个简单的 TextBox,并将该控件用作该列的编辑控件。
现在我在这种情况下遇到了一个奇怪的问题。当我按下字符“q”时,DataGridView 的自定义列中的单元格不显示它并且没有任何反应,但是当我按下任何其他键时,它会正确显示在单元格中。
这里可能是什么问题?我尝试了各种方法,为每个事件调试它,但徒劳无功,我还找不到任何东西。
我在下面给出了我创建的自定义列的代码。
public class CustomControlColumn : DataGridViewColumn
{
public CustomControlColumn() : base(new CustomTextCell()) { }
public override DataGridViewCell CellTemplate
{
get
{
return base.CellTemplate;
}
set
{
// Ensure that the cell used for the template is a CustomComboCell.
if (value != null && !value.GetType().IsAssignableFrom(typeof(CustomTextCell)))
{
throw new InvalidCastException("Must be a CustomTextCell");
}
base.CellTemplate = value;
}
}
}
public class CustomTextCell : DataGridViewTextBoxCell
{
public override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
{
// Set the value of the editing control to the current cell value.
base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);
var control = DataGridView.EditingControl as CustomTextBoxControl;
if (OwningColumn == null)
return;
// Use the default row value when Value property is null.
if (Value == null)
{
control.Text = string.Empty;
}
else
{
control.Text = Value.ToString();
}
}
public override Type EditType
{
get
{
// Return the type of the editing contol that CustomComboCell uses.
return typeof(CustomControlEditingControl);
}
}
public override Type ValueType
{
get
{
// Return the type of the value that CustomTextCell contains.
return typeof(String);
}
}
public override object DefaultNewRowValue
{
get
{
// Use the empty string as the default value.
return string.Empty;
}
}
}
class CustomControlEditingControl : CustomTextBoxControl, IDataGridViewEditingControl
{
public void ApplyCellStyleToEditingControl(DataGridViewCellStyle dataGridViewCellStyle)
{
// Nothing to do
}
public bool EditingControlWantsInputKey(Keys keyData, bool dataGridViewWantsInputKey)
{
// Let the control handle the keys listed.
switch (keyData & Keys.KeyCode)
{
case Keys.Left:
case Keys.Up:
case Keys.Down:
case Keys.Right:
case Keys.Home:
case Keys.End:
case Keys.PageDown:
case Keys.PageUp:
return true;
default:
return false;
}
}
public object GetEditingControlFormattedValue(DataGridViewDataErrorContexts context)
{
return EditingControlFormattedValue;
}
public DataGridView EditingControlDataGridView { get; set; }
public object EditingControlFormattedValue
{
get { return Text; }
set { Text = value.ToString(); }
}
public int EditingControlRowIndex { get; set;}
public bool EditingControlValueChanged { get; set; }
public Cursor EditingPanelCursor
{
get { return base.Cursor; }
}
public bool RepositionEditingControlOnValueChange
{
get { return false; }
}
}
我已通过设计器将其添加为我的 DataGridView 中的列之一,并且 DataGridView 不与任何 DataSource 关联。
谁能指出我这段代码中的问题?