请教大家一个关于自定义DataGridViewColumn的问题，急，高手来帮帮忙啊！！！
我在写一个自定义的DataGridViewColumn对象，功能是该列的单元格用来输入密码，因此必需象文本框的UseSystemPasswordChar功能。大部分都写好了，可以最后发现该列中无法输入 q 字符，不知道为什么，好晕啊，高手帮我看看有什么问题！！谢谢了！！我的思路是把单元格的值用＊来替换，把真实的值保存在TAG中，编辑的时候用从TextBox继承的编辑控件来编辑。下面是代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace gif2seal
{
public class TextBoxColumn : DataGridViewColumn
{
public TextBoxColumn()
: base(new TextBoxCell())
{
}
public override DataGridViewCell CellTemplate
{
get
{
return base.CellTemplate;
}
set
{
// Ensure that the cell used for the template is a TextBoxCell.
if (value != null && !value.GetType().IsAssignableFrom(typeof(TextBoxCell)))
{
throw new InvalidCastException( "Must be a TextBoxCell ");
}
base.CellTemplate = value;
}
}
}
public class TextBoxCell : DataGridViewTextBoxCell
{
public TextBoxCell()
: base()
{
}
protected override bool SetValue(int rowIndex, object value)
{
if (this.DataGridView != null && this.DataGridView.Tag != null)
{
this.Tag = DataGridView.Tag;
DataGridView.Tag = null;
if (value != null)
value = new string( '* ', this.Tag.ToString().Length);
}
return base.SetValue(rowIndex, value);
}
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);
TextBoxEditingControl ctl = DataGridView.EditingControl as TextBoxEditingControl;
ctl.Text = this.Tag.ToString();
}
public override Type EditType
{
get
{
// Return the type of the editing contol that TextBoxCell uses.
return typeof(TextBoxEditingControl);
}
}
public override Type ValueType
{
get
{
// Return the type of the value that TextBoxCell contains.
return typeof(string);
}
}
}
class TextBoxEditingControl : TextBox, IDataGridViewEditingControl
{
DataGridView dataGridView;
private bool valueChanged = false;
int rowIndex;
public TextBoxEditingControl()
{
this.UseSystemPasswordChar = true;
}
// Implements the IDataGridViewEditingControl.EditingControlFormattedValue property.
public object EditingControlFormattedValue
{
get
{
return this.Text;
}
set
{
this.Text = value.ToString();
}
}
// Implements the IDataGridViewEditingControl.GetEditingControlFormattedValue method.
public object GetEditingControlFormattedValue(DataGridViewDataErrorContexts context)
{
return EditingControlFormattedValue;
}
// Implements the IDataGridViewEditingControl.ApplyCellStyleToEditingControl method.
public void ApplyCellStyleToEditingControl(DataGridViewCellStyle dataGridViewCellStyle)
{
}
// Implements the IDataGridViewEditingControl.EditingControlRowIndex property.
public int EditingControlRowIndex
{
get
{
return rowIndex;
}
set
{
rowIndex = value;
}
}
// Implements the IDataGridViewEditingControl.EditingControlWantsInputKey method.
public bool EditingControlWantsInputKey(Keys key, bool dataGridViewWantsInputKey)
{
switch (key & 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:
/*if (key.GetHashCode() == 81)
{
KeysConverter kc = new KeysConverter();
this.EditingControlFormattedValue = kc.ConvertToString(key);
this.OnTextChanged(new EventArgs());
}*/
return false;
}
}
// Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit method.
public void PrepareEditingControlForEdit(bool selectAll)
{
// No preparation needs to be done.
}
// Implements the IDataGridViewEditingControl RepositionEditingControlOnValueChange property.
public bool RepositionEditingControlOnValueChange
{
get
{
return false;
}
}
// Implements the IDataGridViewEditingControl EditingControlDataGridView property.
public DataGridView EditingControlDataGridView
{
get
{
return dataGridView;
}
set
{
dataGridView = value;
}
}
// Implements the IDataGridViewEditingControl EditingControlValueChanged property.
public bool EditingControlValueChanged
{
get
{
return valueChanged;
}
set
{
valueChanged = value;
}
}
// Implements the IDataGridViewEditingControl EditingPanelCursor property.
public Cursor EditingPanelCursor
{
get
{
return base.Cursor;
}
}
protected override void OnTextChanged(EventArgs eventargs)
{
valueChanged = true;
this.EditingControlDataGridView.Tag = null;
this.EditingControlDataGridView.Tag = this.EditingControlFormattedValue;
this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
base.OnTextChanged(eventargs);
}
}
}
[解决办法]
看了一下应该没什么问题的。不过因为你是一个相当于密码显示的TextBox，没有必要相应其它的系统键，将下列函数修改：
public bool EditingControlWantsInputKey(Keys key, bool dataGridViewWantsInputKey)
{
return false;
}
