主攻ASP.NET.3.5.MVC架构之重生:HtmlHelper(一)

HtmlHelper

FormExtensions静态类

BeginForm,BeginRouteForm,EndForm 三种类型

FormMethod.Post优先级最高

可以在多个地方设置action参数，htmlAttributes优先级别最高

BeginRouteForm扩展方法，提供开发者使用

；

设置路由值字典类型的id值和class值

EndForm

<%Html.EndForm(); %>

代码

<%using (Html.BeginForm("index", "home", FormMethod.Post, new { action = "/Controller/actionName" }))

{%>

表单内容

<%}

%>

<%using (Html.BeginForm("index", "AfIndex",

new RouteValueDictionary { { "id", 123 } },

FormMethod.Post,

new RouteValueDictionary { { "class", "cssName" } }

))

{%>

13重载方法

<%}

%>

<%using (Html.BeginRouteForm(new { action = "action" }))

{%>

BeginRouteForm扩展方法，提供开发者使用

<%}

%>

<%Html.EndForm(); %>

InputExtensions类

CheckBox,Hidden,Password,RadioButton,TextBox五种类型

CheckBox

代码：

<%=Html.BeginForm("CheckBox","Home") %>

<fieldset>

<legend>设置字体:</legend>

<%=Html.CheckBox("MyCheckBox1",true,new{id="checkBox1"}) %>

<label for="checkBox1">黑体</label>

<%=Html.CheckBox("MyCheckBox2",false,new{id="checkBox2"}) %>

<label for="checkBox1">斜体</label>

<br/>

<input type="submit" value="Submit" />

</fieldset>

<%Html.EndForm(); %>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

<h2>CheckBox</h2>

<%=Html.TextBox("t1", ViewData["t1"])%>

<%=Html.TextBox("t2", ViewData["t2"])%>

</asp:Content>

public ActionResult CheckBox(FormCollection formcollection)

{

//通过索引获得复选框控件状态值字符串

bool myCheckBox1 = formcollection[0].Contains("true");

//通过键值获得复选框控件状态值字符串

bool myCheckBox2 = formcollection["MyCheckBox2"].Contains("true");

if (myCheckBox1)

ViewData["t1"] = "1选中";

else

ViewData["t1"] = "1未选中";

if (myCheckBox2)

ViewData["t2"] = "2选中";

else

ViewData["t2"] = "2未选中";

return View();

}

Hidden

<%=Html.Hidden("name",123) %>

Password

<%=Html.Password("password",123) %>

RadioButton

<% using (Html.BeginForm("RadioButton", "Home"))

{%>

<fieldset>

<legend>设置字号</legend>

<%=Html.RadioButton("MyRadioButton","MyValue1",true,new{id="MyRadioButton1"})%>

<label for="MyRadioButton1">

10#</label>

<%=Html.RadioButton("MyRadioButton","MyValue2",true,new{id="MyRadioButton2"})%>

<label for="MyRadioButton1">

20#</label>

<input class="button" type="submit" value="提交" />

</fieldset>

<%} %>

<h2>RadioButton</h2>

<%=Html.TextBox("t1", ViewData["MyRadioButton"])%>

public ActionResult RadioButton(FormCollection formcollection)

{

string radioButtion1=formcollection[0];

string radioButtion2 = formcollection["MyRadioButton1"];

ViewData["MyRadioButton"] = radioButtion1;

return View();

}

TextBox

<%=Html.TextBox("Message") %>

<%=Html.TextBox("myTextBox", null, new { size=50})%>

LinkExtensions类

ActionLink，RouteLink两种类型

ActionLink

ActionLink扩展方法主要实现一个连接

<%=Html.ActionLink("actionlink", "About")%>

<%=Html.ActionLink("actionlink", "About","Home")%>

RouteLink

<%=Html.RouteLink("routLink", "default", new { id = 100 })%>

RenderPartialExtensions类

RenderPartial该用户控件主要用来显示数据表Categories

在ASP.NET MVC中使用RenderPartial方法时的一些性能问题，记住两点：一是在ASP.NET MVC应用程序发布到生产服务器时，别忘了关闭Debug模式（对于ASP.NET WebForm应用程序也是一样）；二时尽可能的减少调用RenderPartial方法的次数，如通过在UserControl中进行遍历等方法。