ValidationExtensions.ValidationMessageFor(Of TModel, TProperty) Method (HtmlHelper(Of TModel), Expression(Of Func(Of TModel, TProperty)), String, IDictionary(Of String, Object))
Visual Studio 2010
Returns the HTML markup for a validation-error message for each data field that is represented by the specified expression, using the specified message and HTML attributes.
Assembly: System.Web.Mvc (in System.Web.Mvc.dll)
'Declaration <ExtensionAttribute> _ Public Shared Function ValidationMessageFor(Of TModel, TProperty) ( _ htmlHelper As HtmlHelper(Of TModel), _ expression As Expression(Of Func(Of TModel, TProperty)), _ validationMessage As String, _ htmlAttributes As IDictionary(Of String, Object) _ ) As MvcHtmlString
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 render.
- validationMessage
- Type: System.String
The message to display if the specified field contains an error.
- htmlAttributes
- Type: System.Collections.Generic.IDictionary(Of String, Object)
A dictionary that contains the HTML attributes for the element.
Return Value
Type: System.Web.Mvc.MvcHtmlStringThe HTML markup for a validation-error message for each data field that is represented by the expression. If no validation error occurs or client validation is disabled, this method returns Nothing.
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 Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).Community Additions
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