asp.net 扩展GridView 增加单选按钮列的代码

/// <summary>
/// 单选按钮列
/// </summary>
/// <remarks>
/// 如果没有设置groupname，则使用gridview的id作为groupname
/// 如果没有设置datafield，则使用rowindex作为value
/// 允许设置dataformatstring格式化数据
/// </remarks>
[aspnethostingpermission(securityaction.demand,
level = aspnethostingpermissionlevel.minimal)]
public class radiobuttonselectfield : datacontrolfield
{
/// <summary>
/// 单选按钮组名，默认去gridview的clientid
/// </summary>
[description("单选按钮组名，默认去gridview的clientid")]
public string radiobuttongroupname
{
get
{
return this.viewstate["radiobuttongroupname"] as string;
}
set
{
this.viewstate["radiobuttongroupname"] = value;
}
}

/// <summary>
/// 单选按钮的样式
/// </summary>
[description("单选按钮的样式")]
public string radiobuttoncssclass
{
get
{
return this.viewstate["radiobuttoncssclass"] as string;
}
set
{
this.viewstate["radiobuttoncssclass"] = value;
}
}

/// <summary>
/// 要绑定的数据表达式
/// </summary>
[description("要绑定的数据表达式")]
public string datafield
{
get
{
return this.viewstate["datafield"] as string;
}
set
{
this.viewstate["datafield"] = value;
}
}

/// <summary>
/// 要绑定的数据表达式格式
/// </summary>
[description("要绑定的数据表达式格式")]
public string dataformatstring
{
get
{
return this.viewstate["dataformatstring"] as string;
}
set
{
this.viewstate["dataformatstring"] = value;
}
}

/// <summary>
/// return self;
/// </summary>
/// <returns></returns>
protected override datacontrolfield createfield()
{
return this;
}

/// <summary>
/// 添加控件
/// </summary>
/// <param name="cell"></param>
/// <param name="celltype"></param>
/// <param name="rowstate"></param>
/// <param name="rowindex"></param>
public override void initializecell(datacontrolfieldcell cell, datacontrolcelltype celltype, datacontrolrowstate rowstate, int rowindex)
{
base.initializecell(cell, celltype, rowstate, rowindex);

if (celltype == datacontrolcelltype.datacell)
{
var literal = new literal();

if (string.isnullorempty(this.datafield))
{
setliteralhtml(literal, rowindex.tostring());
}
else
{
literal.databinding += new eventhandler(literal_databinding);
}

cell.controls.add(literal);
}
}

void literal_databinding(object sender, eventargs e)
{
if (string.isnullorempty(this.datafield))
{
return;
}

var literal = sender as literal;
if (literal == null)
{
return;
}
var cell = literal.parent as tablecell;
if (cell == null)
{
return;
}
var container = literal.namingcontainer;
if (container == null)
{
return;
}
bool founddataitem;
var dataitem = databinder.getdataitem(container, out founddataitem);
if (!founddataitem)
{
return;
}

var datavalue = null as string;
if (this.datafield.contains('.'))
{
datavalue = databinder.eval(dataitem, this.datafield, this.dataformatstring);
}
else
{
datavalue = databinder.getpropertyvalue(dataitem, this.datafield, this.dataformatstring);
}

setliteralhtml(literal, datavalue);
}

private void setliteralhtml(literal literal, string datavalue)
{
var groupname = this.radiobuttongroupname;
if (string.isnullorempty(groupname))
{
groupname = literal.parent.parent.parent.parent.id;
}
var cssclass = this.radiobuttoncssclass;
if (!string.isnullorempty(cssclass))
{
cssclass = string.format("class=\"{0}\"", this.radiobuttoncssclass);
}

var selected = false;
var selectedvalue = literal.page.request[groupname];
if (string.isnullorempty(selectedvalue) == false)
{
if (string.compare(selectedvalue, datavalue, true) == 0)
{
selected = true;
}
}

var rbhtml = string.format("<input type=\"radio\" name=\"{0}\" value=\"{1}\" {2} {3} />",
groupname,
datavalue,
cssclass,
selected ? "checked" : string.empty);

literal.text = rbhtml;
}
}