InputExtensions.RadioButton Method (HtmlHelper, String, Object, Object)

Artikel
02/21/2011

Returns a radio button input element that is used to present mutually exclusive options.

Namespace: System.Web.Mvc.Html
Assembly: System.Web.Mvc (in System.Web.Mvc.dll)

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function RadioButton ( _
    htmlHelper As HtmlHelper, _
    name As String, _
    value As Object, _
    htmlAttributes As Object _
) As MvcHtmlString

public static MvcHtmlString RadioButton(
    this HtmlHelper htmlHelper,
    string name,
    Object value,
    Object htmlAttributes
)

[ExtensionAttribute]
public:
static MvcHtmlString^ RadioButton(
    HtmlHelper^ htmlHelper, 
    String^ name, 
    Object^ value, 
    Object^ htmlAttributes
)

Parameters

htmlHelper
Type: System.Web.Mvc.HtmlHelper
The HTML helper instance that this method extends.

name
Type: System.String
The name of the form field and the ViewDataDictionary key that is used to look up the value.

value
Type: System.Object
If this radio button is selected, the value of the radio button that is submitted when the form is posted. If the value of the selected radio button in the ViewDataDictionary or the ModelStateDictionary object matches this value, this radio button is selected.

htmlAttributes
Type: System.Object
An object that contains the HTML attributes to set for the element.

Return Value

Type: System.Web.Mvc.MvcHtmlString
An input element whose type attribute is set to "radio".

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type HtmlHelper. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).

Exceptions

Exception	Condition
ArgumentException	The name parameter is null reference (Nothing in Visual Basic) or empty.
ArgumentNullException	The value parameter is null reference (Nothing in Visual Basic).

Remarks

The difference between calling the RadioButton method and using an input element is that the RadioButton method is designed to make it easy to bind to view data or model data.

The htmlAttributes parameter consists of an object that contains name/value pairs. The attributes that are specified in the name/value pairs depend on the HTML element that is being rendered. For example, for an input element where type is set to "radio", you might provide the following anonymous object:

new { id = "radio1" }

New With { .id = "radio1" }

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