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SelectExtensions.DropDownListFor(Of TModel, TProperty) Method (HtmlHelper(Of TModel), Expression(Of Func(Of TModel, TProperty)), IEnumerable(Of SelectListItem), String, IDictionary(Of String, Object))

Returns an HTML select element for each property in the object that is represented by the specified expression using the specified list items, option label, and HTML attributes.

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

'Declaration
<ExtensionAttribute> _
Public Shared Function DropDownListFor(Of TModel, TProperty) ( _
	htmlHelper As HtmlHelper(Of TModel), _
	expression As Expression(Of Func(Of TModel, TProperty)), _
	selectList As IEnumerable(Of SelectListItem), _
	optionLabel As String, _
	htmlAttributes As IDictionary(Of String, Object) _
) As MvcHtmlString
'Usage
Dim htmlHelper As HtmlHelper(Of TModel)
Dim expression As Expression(Of Func(Of TModel, TProperty))
Dim selectList As IEnumerable(Of SelectListItem)
Dim optionLabel As String 
Dim htmlAttributes As IDictionary(Of String, Object)
Dim returnValue As MvcHtmlString 

returnValue = htmlHelper.DropDownListFor(expression, _
	selectList, optionLabel, htmlAttributes)

Type Parameters

TModel

The type of the model.

TProperty

The type of the value.

Parameters

htmlHelper
Type: System.Web.Mvc.HtmlHelper(Of TModel)

The HTML helper instance that this method extends.

expression
Type: System.Linq.Expressions.Expression(Of Func(Of TModel, TProperty))

An expression that identifies the object that contains the properties to display.

selectList
Type: System.Collections.Generic.IEnumerable(Of SelectListItem)

A collection of SelectListItem objects that are used to populate the drop-down list.

optionLabel
Type: System.String

The text for a default empty item. This parameter can be Nothing.

htmlAttributes
Type: System.Collections.Generic.IDictionary(Of String, Object)

An object that contains the HTML attributes to set for the element.

Return Value

Type: System.Web.Mvc.MvcHtmlString
An HTML select element for each property in the object that is represented by the expression.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type HtmlHelper(Of TModel). When you use instance method syntax to call this method, omit the first parameter. For more information, see https://msdn.microsoft.com/en-us/library/bb384936(v=vs.108) or https://msdn.microsoft.com/en-us/library/bb383977(v=vs.108).

ExceptionCondition
ArgumentNullException

The expression parameter is Nothing.

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