ValidationExtensions.ValidationMessageFor<TModel, TProperty> Method (HtmlHelper<TModel>, Expression<Func<TModel, TProperty>>, String, IDictionary<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)
Syntax
'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
public static MvcHtmlString ValidationMessageFor<TModel, TProperty>(
this HtmlHelper<TModel> htmlHelper,
Expression<Func<TModel, TProperty>> expression,
string validationMessage,
IDictionary<string, Object> htmlAttributes
)
[ExtensionAttribute]
public:
generic<typename TModel, typename TProperty>
static MvcHtmlString^ ValidationMessageFor(
HtmlHelper<TModel>^ htmlHelper,
Expression<Func<TModel, TProperty>^>^ expression,
String^ validationMessage,
IDictionary<String^, Object^>^ htmlAttributes
)
Type Parameters
- TModel
The type of the model.
- TProperty
The type of the value.
Parameters
- htmlHelper
Type: System.Web.Mvc.HtmlHelper<TModel>
The HTML helper instance that this method extends.
- expression
Type: System.Linq.Expressions.Expression<Func<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<String, Object>
A dictionary that contains the HTML attributes for the element.
Return Value
Type: System.Web.Mvc.MvcHtmlString
The 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 null reference (Nothing in Visual Basic).
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type HtmlHelper<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).