ValidationExtensions.ValidationMessageFor(Of TModel, TProperty) Method (HtmlHelper(Of TModel), Expression(Of Func(Of TModel, TProperty)), String, IDictionary(Of String, Object))
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.
Namespace: System.Web.Mvc.Html
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 'Usage Dim htmlHelper As HtmlHelper(Of TModel) Dim expression As Expression(Of Func(Of TModel, TProperty)) Dim validationMessage As String Dim htmlAttributes As IDictionary(Of String, Object) Dim returnValue As MvcHtmlString returnValue = htmlHelper.ValidationMessageFor(expression, _ validationMessage, htmlAttributes)
Type Parameters
- TModel
The type of the model.
- TProperty
The type of the property.
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)
An object that contains the HTML attributes for the element.
Return Value
Type: System.Web.Mvc.MvcHtmlStringIf the property or object is valid, an empty string; otherwise, a span element that contains an error message.
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).
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