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asp.net 扩展GridView 增加单选按钮列的代码

时间:2019-07-09 16:42     来源/作者:ASP.NET之家
代码如下:

/// <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; 

}

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