MVC扩展HtmlHelper,加入RadioButtonList、CheckBoxList、DropdownList

时间:2024-08-16 08:33:56

代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;
using System.Web.UI; namespace System.Web.Mvc.Html
{
public static class HtmlExtension
{
/// <summary>
/// 扩展 DropdownList 列表1
/// </summary>
/// <param name="helper">扩展源</param>
/// <param name="name">元素名称</param>
/// <param name="items">SelectListItem集合</param>
/// <param name="attributes">html属性</param>
/// <returns></returns>
public static MvcHtmlString DropdownList(this HtmlHelper helper, string name, IEnumerable<SelectListItem> items, object attributes = null)
{
return helper.DropDownList(name, items, attributes);
}
/// <summary>
/// 扩展 DropdownList 列表2
/// </summary>
/// <param name="helper">扩展源</param>
/// <param name="name">元素名称</param>
/// <param name="viewDataName">ViewData键名称</param>
/// <param name="attributes">html属性</param>
/// <returns></returns>
public static MvcHtmlString DropdownList(this HtmlHelper helper, string name, string viewDataName, object attributes = null)
{
List<SelectListItem> list = helper.ViewData[viewDataName] as List<SelectListItem>;
return helper.DropDownList(name, list, attributes);
}
/// <summary>
/// 扩展 DropdownList 列表3
/// </summary>
/// <typeparam name="TModel">实体</typeparam>
/// <typeparam name="TValue">属性</typeparam>
/// <param name="helper"></param>
/// <param name="expression">表达式</param>
/// <param name="items">数据列表</param>
/// <param name="column">每行显示个数</param>
/// <param name="attributes">html属性</param>
/// <returns></returns>
public static MvcHtmlString DropdownListFor<TModel, TValue>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TValue>> expression, IEnumerable<SelectListItem> items, object attributes = null)
{
return helper.DropDownListFor(expression, items, attributes);
} /// <summary>
/// 扩展 DropdownList 列表4
/// </summary>
/// <typeparam name="TModel">实体</typeparam>
/// <typeparam name="TValue">属性</typeparam>
/// <param name="helper"></param>
/// <param name="expression">表达式</param>
/// <param name="viewDataName">viewData数据列表名称</param>
/// <param name="attributes">html属性</param>
/// <returns></returns>
public static MvcHtmlString DropdownListFor<TModel, TValue>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TValue>> expression, string viewDataName, object attributes = null)
{
List<SelectListItem> list = helper.ViewData[viewDataName] as List<SelectListItem>;
return helper.DropdownListFor(expression, list, attributes);
} /// <summary>
/// 扩展 radiobutton 列表1
/// </summary>
/// <typeparam name="TModel">实体</typeparam>
/// <typeparam name="TValue">属性</typeparam>
/// <param name="helper"></param>
/// <param name="expression">表达式</param>
/// <param name="items">数据列表</param>
/// <param name="column">每行显示个数</param>
/// <param name="attributes">html属性</param>
/// <returns></returns>
public static MvcHtmlString RadioButtonListFor<TModel, TValue>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TValue>> expression, IEnumerable<SelectListItem> items, int column = , object attributes = null)
{
string raidobuttonStr = "";
BuildListTag(out raidobuttonStr, "radio", items, expression, column, attributes);
return MvcHtmlString.Create(raidobuttonStr);
} /// <summary>
/// 扩展 radiobutton 列表2
/// </summary>
/// <typeparam name="TModel">实体</typeparam>
/// <typeparam name="TValue">属性</typeparam>
/// <param name="helper"></param>
/// <param name="expression">表达式</param>
/// <param name="viewDataName">viewData数据列表名称</param>
/// <param name="column">每行显示个数</param>
/// <param name="attributes">属性</param>
/// <returns></returns>
public static MvcHtmlString RadioButtonListFor<TModel, TValue>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TValue>> expression, string viewDataName, int column = , object attributes = null)
{
string raidobuttonStr = "";
var items = helper.ViewData[viewDataName] as List<SelectListItem>;
BuildListTag(out raidobuttonStr, "radio", items, expression, column, attributes);
return MvcHtmlString.Create(raidobuttonStr);
} /// <summary>
/// 扩展 CheckBox 列表1
/// </summary>
/// <typeparam name="TModel">实体</typeparam>
/// <typeparam name="TValue">属性</typeparam>
/// <param name="helper"></param>
/// <param name="expression">表达式</param>
/// <param name="items">数据列表</param>
/// <param name="column">每行显示个数</param>
/// <param name="attributes">html属性</param>
/// <returns></returns>
public static MvcHtmlString CheckBoxListFor<TModel, TValue>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TValue>> expression, IEnumerable<SelectListItem> items, int column = , object attributes = null)
{
string raidobuttonStr = "";
BuildListTag(out raidobuttonStr, "checkbox", items, expression, column, attributes);
return MvcHtmlString.Create(raidobuttonStr);
} /// <summary>
/// 扩展 CheckBox 列表2
/// </summary>
/// <typeparam name="TModel">实体</typeparam>
/// <typeparam name="TValue">属性</typeparam>
/// <param name="helper"></param>
/// <param name="expression">表达式</param>
/// <param name="viewDataName">viewData数据列表名称</param>
/// <param name="column">每行显示个数</param>
/// <param name="attributes">属性</param>
/// <returns></returns>
public static MvcHtmlString CheckBoxListFor<TModel, TValue>(this HtmlHelper<TModel> helper, Expression<Func<TModel, TValue>> expression, string viewDataName, int column = , object attributes = null)
{
string raidobuttonStr = "";
var items = helper.ViewData[viewDataName] as List<SelectListItem>;
BuildListTag(out raidobuttonStr, "checkbox", items, expression, column, attributes);
return MvcHtmlString.Create(raidobuttonStr);
} /// <summary>
/// 构造radioList或者checkBoxList标签
/// </summary>
/// <typeparam name="TModel"></typeparam>
/// <typeparam name="TValue"></typeparam>
/// <param name="raidobuttonStr">拼接的字符窜</param>
/// <param name="tag">标签(checkbox or radio)</param>
/// <param name="expression">表达式</param>
/// <param name="items">数据列表</param>
/// <param name="column">每行显示个数</param>
/// <param name="attributes">属性</param>
private static void BuildListTag<TModel, TValue>(out string raidobuttonStr, string tag, IEnumerable<SelectListItem> items, Expression<Func<TModel, TValue>> expression, int column = , object attributes = null)
{
raidobuttonStr = "";
if (items != null && items.Any())
{
int count = ;
///获取表达式属性名称
var name = (expression.Body as MemberExpression).Member.Name;
foreach (var item in items)
{
TagBuilder raidobutton = new TagBuilder("input");
raidobutton.Attributes.Add("type", tag);
raidobutton.Attributes.Add("name", name);
raidobutton.Attributes.Add("value", item.Value);
if (item.Selected)
{
raidobutton.Attributes.Add("checked", "checked");
}
if (attributes != null)
{
raidobutton.MergeAttributes(new RouteValueDictionary(attributes));
} raidobuttonStr += raidobutton.ToString(TagRenderMode.SelfClosing);
raidobuttonStr += item.Text;
raidobuttonStr += "&nbsp;&nbsp;&nbsp;"; if (column == )
{
raidobuttonStr += "<br/>";
}
///根据每行显示个数设置换行
else
{
if (count == column && column != )
{
raidobuttonStr += "<br/>";
}
}
count++;
}
}
}
}
}

使用方法:

@Html.CheckBoxListFor(item => item.AllRoles, "Roles", 5)
@Html.DropdownListFor(item => item.AllRoles, "Roles")
@Html.DropdownList("AllRoles", "Roles")
@Html.DropdownListFor(item => item.TypeID, ViewData["ArticleTypes"] as List<SelectListItem>)
还有其他的一些重载方法,我没有逐个写出,大家都可以试试。
http://www.cnblogs.com/artech/archive/2012/03/13/code-binding.html
http://www.cnblogs.com/a546558309/p/4554592.html