如何在datagrid的某一列中插入下拉框

winform
http://www.csdn.net/develop/Read_Article.asp?Id=16434

我用的是webform
模板列的方法能说得详细一些吗
小弟新手

谢谢acewang(**^o^**)
webform会不会区别很大呢？

添加一个模板列  <asp:TemplateColumn SortExpression="it" HeaderText="it" FooterText="it">
      <ItemTemplate>
   <asp:RadioButton ID="radio" Runat="server"></asp:RadioButton>
</ItemTemplate>
</asp:TemplateColumn>

ASP.NET很灵活，用模板列，或自己写HTML代码都可以。
windows form的麻烦一点，要自己定义，好在.net的结构比较开放，下面是一个combobox列.using System;
using System.Drawing;
using System.Data;
using System.Collections;
using System.Windows.Forms;
using System.ComponentModel;namespace Health.Applications.RIS
{
public class DataGridComboBox : ComboBox
{
private DataGridComboBoxColumn m_column; public bool isInEditOrNavigateMode = true; //
// Basic ComboBox used for all ComboBoxes displayes in a datagrid
//
public DataGridComboBox(DataGridComboBoxColumn column) : base()
{
//base.DropDownStyle =ComboBoxStyle.DropDownList;
m_column = column;
} protected override bool ProcessKeyMessage(ref Message m)
{
return base.ProcessKeyMessage (ref m);
} protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
{
return base.ProcessCmdKey (ref msg, keyData);
} } /// <summary>
/// 此类用于在DataGrid里添加一个含ComboBox输入的列。
/// by wangchuanju  2003.11
/// </summary>
public class DataGridComboBoxColumn : DataGridColumnStyle
{
private DataGridComboBox _comboBox;
private object _dataSource;
private string _displayMember, _valueMember;
private string _oldValue="";
private object _defaultValue;
private bool _inEdit= false;
private int _xMargin = 2;
private int _yMargin = 1; //public DataGridComboBoxColumn(PropertyDescriptor prop)
//{
//}
public DataGridComboBoxColumn(string colName, object dataSource, string displayMember, string valueMember, object defaultValue, DataGrid dataGrid)
{
_comboBox = new DataGridComboBox(this);
_comboBox.Visible = false;
_dataSource = dataSource;
_displayMember = displayMember;
_valueMember = valueMember;
_defaultValue = defaultValue;

_comboBox.DataSource = _dataSource;
_comboBox.DisplayMember = _displayMember;
_comboBox.ValueMember = _valueMember;
//_comboBox.DropDownStyle = ComboBoxStyle.DropDownList;  该句会引起在ComboBox框里无法用键盘上下箭头键进行滚动
Graphics gContext = dataGrid.CreateGraphics();
float widest = 0;
SizeF stringSize = new SizeF(0,0);
if (_dataSource is DataTable)
{
DataTable table = _dataSource as DataTable;
foreach (DataRow dr in table.Rows)
{
stringSize = gContext.MeasureString(dr[_displayMember].ToString(), dataGrid.Font);
if (stringSize.Width > widest)
widest = stringSize.Width;
}
}
else
{
PropertyDescriptor pd;
if (_dataSource is IList)
{
foreach (object item in (_dataSource as IList))
{
pd = TypeDescriptor.GetProperties(item)[_displayMember];
if (pd != null)
{
stringSize = gContext.MeasureString(pd.GetValue(item).ToString(), dataGrid.Font);
if (stringSize.Width > widest)
widest = stringSize.Width;
}
}
}
}
gContext.Dispose(); _comboBox.DropDownWidth = (int)Math.Ceiling(widest) + 20; this.Width = _comboBox.DropDownWidth + 25;   // add the space for the dropdown arrow

this.MappingName = colName;
this.HeaderText = colName;
dataGrid.Controls.Add(_comboBox); _comboBox.SelectedIndexChanged += new EventHandler(_comboxBox_SelecteIndexChanged);
} private void _comboxBox_SelecteIndexChanged(object sender, System.EventArgs e)
{
if (_inEdit)
{
object _value = _comboBox.SelectedValue;
if (_value == null && _defaultValue != null)
_value = _defaultValue; this.ColumnStartedEditing(_comboBox);

if(NullText.Equals(_value) || _value == null)
{
_value = System.Convert.DBNull;
}
this.SetColumnValueAtRow((CurrencyManager)this.DataGridTableStyle.DataGrid.BindingContext[this.DataGridTableStyle.DataGrid.DataSource, this.DataGridTableStyle.DataGrid.DataMember], this.DataGridTableStyle.DataGrid.CurrentCell.RowNumber, _value);
_comboBox.SelectedValue = _value;
}
} public DataGridComboBox DisplayComboBox
{
get { return _comboBox; }
} public object DisplayDataSource
{
get { return _dataSource; }
set
{
_dataSource = value;
_comboBox.DataSource = _dataSource;
}
} public string DisplayMember
{
get { return _displayMember; }
set
{
_displayMember = value;
_comboBox.DisplayMember = _displayMember;
}
} public string ValueMember
{
get { return _valueMember; }
set
{
_valueMember = value;
_comboBox.ValueMember = _valueMember;
}
} public object DefaultValue
{
get { return _defaultValue; }
set
{
_defaultValue = value;
}
} protected override void SetDataGridInColumn(DataGrid value)
{
base.SetDataGridInColumn(value);
if ( _comboBox.Parent != value && _comboBox.Parent != null)
_comboBox.Parent.Controls.Remove(_comboBox); if ( value != null )
value.Controls.Add(_comboBox);
}

protected override void UpdateUI(CurrencyManager source, int rowNum, string instantText)
{
_comboBox.Text = GetText(GetColumnValueAtRow(source, rowNum));
if(instantText!=null)
{
_comboBox.Text = instantText;
}
}
protected override void Abort(int rowNum)
{
_comboBox.Text = _oldValue;
HideComboBox();
EndEdit();
} protected override bool Commit(CurrencyManager dataSource, int rowNum)
{
HideComboBox();
if(!_inEdit)
{
return true;
} try
{
object _value = _comboBox.SelectedValue;

if (_value == null && _defaultValue != null) _value = _defaultValue; if(NullText.Equals(_value))
{
_value = System.Convert.DBNull;
}
this.SetColumnValueAtRow(dataSource, rowNum, _value);
}
catch
{
_comboBox.Text = _oldValue;
return false;
}
finally
{
EndEdit();
}
return true;
} protected override void ConcedeFocus()
{
_comboBox.Visible = false;
//_inEdit = false;
//this.DataGridTableStyle.DataGrid.Focus();
} protected override void ColumnStartedEditing(Control editingControl)
{
base.ColumnStartedEditing (editingControl);
}
protected override void Edit(CurrencyManager source, int rowNum, Rectangle bounds, bool readOnly, string instantText, bool cellIsVisible)
{
_comboBox.Text = "";
Rectangle originalBounds = bounds;
_oldValue = _comboBox.Text; if (!cellIsVisible) return; bounds.Offset(_xMargin, _yMargin);
bounds.Width -= _xMargin * 2;
bounds.Height -= _yMargin ;
_comboBox.Bounds = bounds;
if (!readOnly)
_comboBox.Visible = true; _comboBox.SelectedValue = GetText(GetColumnValueAtRow(source, rowNum));
if (instantText != null)
{
_comboBox.SelectedValue = instantText;
} _comboBox.RightToLeft = this.DataGridTableStyle.DataGrid.RightToLeft;
_comboBox.Focus(); if (instantText == null)
_comboBox.SelectAll();
else
{
int end = _comboBox.Text.Length;
_comboBox.Select(end, 0);
} if(_comboBox.Visible)
this.DataGridTableStyle.DataGrid.Invalidate(originalBounds); _inEdit = true;
} protected override int GetMinimumHeight()
{
return _comboBox.PreferredHeight + _yMargin;
} protected override int GetPreferredHeight(Graphics g, object value)
{
return FontHeight + _yMargin;
} protected override Size GetPreferredSize(Graphics g, object value)
{
Size extends = Size.Ceiling(g.MeasureString(GetText(value), this.DataGridTableStyle.DataGrid.Font));
extends.Width += _xMargin * 2 + DataGridTableGridLineWidth;
extends.Height += _yMargin;
return extends;
} protected override void Paint(Graphics g, Rectangle bounds, CurrencyManager source, int rowNum)
{
Paint(g, bounds, source, rowNum, false);
} protected override void Paint(Graphics g, Rectangle bounds, CurrencyManager source, int rowNum, bool alignToRight)
{
Brush backBrush = new SolidBrush(this.DataGridTableStyle.BackColor);
Brush foreBrush = new SolidBrush(this.DataGridTableStyle.ForeColor);
Paint(g, bounds, source, rowNum, backBrush, foreBrush, alignToRight);
}
protected override void Paint(Graphics g, Rectangle bounds, CurrencyManager source, int rowNum, Brush backBrush, Brush foreBrush, bool alignToRight)
{
string text = GetText(GetColumnValueAtRow(source, rowNum));
string tempText; if (_dataSource is DataTable)
{
DataTable table = _dataSource as DataTable;
foreach (DataRow dr in table.Rows)
{
if (dr[_valueMember].ToString() == text)
{
text = dr[_displayMember].ToString();
break;
}
}
}
else
{
PropertyDescriptorCollection pdc;
PropertyDescriptor pd;
if (_dataSource is IList)
{
foreach (object item in (_dataSource as IList))
{
pdc = TypeDescriptor.GetProperties(item);
pd = pdc[_valueMember];
if (pd != null)
{
tempText = pd.GetValue(item).ToString();
if (tempText == text)
{
pd = pdc[_displayMember];
if (pd != null)
text = pd.GetValue(item).ToString();
}
}
}
}

} PaintText(g, bounds, text, backBrush, foreBrush, alignToRight);
} private void PaintText(Graphics g ,Rectangle bounds, string text, bool alignToRight)
{
Brush backBrush = new SolidBrush(this.DataGridTableStyle.BackColor);
Brush foreBrush = new SolidBrush(this.DataGridTableStyle.ForeColor);
PaintText(g, bounds, text, backBrush, foreBrush, alignToRight);
}
private void PaintText(Graphics g ,Rectangle bounds, string text, Brush backBrush, Brush foreBrush, bool alignToRight)
{
Rectangle rect = bounds;
RectangleF rectF = rect;
StringFormat format = new StringFormat();

if (alignToRight )
format.FormatFlags = StringFormatFlags.DirectionRightToLeft;
switch(Alignment)
{
case HorizontalAlignment.Left : format.Alignment = StringAlignment.Near; break;
case HorizontalAlignment.Right : format.Alignment = StringAlignment.Far; break;
case HorizontalAlignment.Center : format.Alignment = StringAlignment.Center; break;
}
format.FormatFlags |= StringFormatFlags.NoWrap; g.FillRectangle(backBrush, rect);
rectF.Offset(0, _yMargin);
rectF.Height -= _yMargin;
g.DrawString(text, this.DataGridTableStyle.DataGrid.Font, foreBrush, rectF, format); format.Dispose();
} private string GetText(object val)
{
if(val==System.DBNull.Value)
{
return this.NullText;
}
if(val!=null)
{
return val.ToString();
}
else
{
return string.Empty;
}
} private int DataGridTableGridLineWidth
{
get
{
if(this.DataGridTableStyle.GridLineStyle == DataGridLineStyle.Solid)
{
return 1;
}
else
{
return 0;
}
}
} private void HideComboBox()
{
if(_comboBox.Focused)
{
this.DataGridTableStyle.DataGrid.Focus();
}
_comboBox.Visible = false;
} private void EndEdit()
{
_inEdit = false;
Invalidate();
}
}
}

谢谢大家的帮助
可能我说的不太清楚
1。我用的是webform
2。我需要每行的下拉框中的数据从数据库读出来，每行都是不一样的

调试易

如何在datagrid的某一列中插入下拉框

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