HtmlHelperValidationExtensions.ValidationMessageFor Method

Definition

Namespace:

Microsoft.AspNetCore.Mvc.Rendering

Assembly:

Microsoft.AspNetCore.Mvc.ViewFeatures.dll

Package:

Microsoft.AspNetCore.App.Ref v8.0.0

Overloads

ValidationMessageFor<TModel,TResult>(IHtmlHelper<TModel>, Expression<Func<TModel,TResult>>, String, Object)	Returns the validation message if an error exists in the ModelStateDictionary object for the specified expression.
ValidationMessageFor<TModel,TResult>(IHtmlHelper<TModel>, Expression<Func<TModel,TResult>>, String, String)	Returns the validation message if an error exists in the ModelStateDictionary object for the specified expression.
ValidationMessageFor<TModel,TResult>(IHtmlHelper<TModel>, Expression<Func<TModel,TResult>>)	Returns the validation message if an error exists in the ModelStateDictionary object for the specified expression.
ValidationMessageFor<TModel,TResult>(IHtmlHelper<TModel>, Expression<Func<TModel,TResult>>, String)	Returns the validation message if an error exists in the ModelStateDictionary object for the specified expression.

ValidationMessageFor<TModel,TResult>(IHtmlHelper<TModel>, Expression<Func<TModel,TResult>>, String, Object)

Source:

HtmlHelperValidationExtensions.cs

Returns the validation message if an error exists in the ModelStateDictionary object for the specified expression.

public:
generic <typename TModel, typename TResult>
[System::Runtime::CompilerServices::Extension]
 static Microsoft::AspNetCore::Html::IHtmlContent ^ ValidationMessageFor(Microsoft::AspNetCore::Mvc::Rendering::IHtmlHelper<TModel> ^ htmlHelper, System::Linq::Expressions::Expression<Func<TModel, TResult> ^> ^ expression, System::String ^ message, System::Object ^ htmlAttributes);

public static Microsoft.AspNetCore.Html.IHtmlContent ValidationMessageFor<TModel,TResult> (this Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper<TModel> htmlHelper, System.Linq.Expressions.Expression<Func<TModel,TResult>> expression, string message, object htmlAttributes);

static member ValidationMessageFor : Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper<'Model> * System.Linq.Expressions.Expression<Func<'Model, 'Result>> * string * obj -> Microsoft.AspNetCore.Html.IHtmlContent

<Extension()>
Public Function ValidationMessageFor(Of TModel, TResult) (htmlHelper As IHtmlHelper(Of TModel), expression As Expression(Of Func(Of TModel, TResult)), message As String, htmlAttributes As Object) As IHtmlContent

Type Parameters

TModel

The type of the model.

TResult

The type of the expression result.

Parameters

htmlHelper

IHtmlHelper<TModel>

The IHtmlHelper instance this method extends.

expression

Expression<Func<TModel,TResult>>

An expression to be evaluated against the current model.

message

String

The message to be displayed. If null or empty, method extracts an error string from the ModelStateDictionary object. Message will always be visible but client-side validation may update the associated CSS class.

htmlAttributes

Object

An Object that contains the HTML attributes for the (ValidationMessageElement) element. Alternatively, an IDictionary<TKey,TValue> instance containing the HTML attributes.

Returns

IHtmlContent

A new IHtmlContent containing a ValidationMessageElement element. An empty IHtmlContent if the expression is valid and client-side validation is disabled.

ValidationMessageFor<TModel,TResult>(IHtmlHelper<TModel>, Expression<Func<TModel,TResult>>, String, String)

Source:

HtmlHelperValidationExtensions.cs

Returns the validation message if an error exists in the ModelStateDictionary object for the specified expression.

public:
generic <typename TModel, typename TResult>
[System::Runtime::CompilerServices::Extension]
 static Microsoft::AspNetCore::Html::IHtmlContent ^ ValidationMessageFor(Microsoft::AspNetCore::Mvc::Rendering::IHtmlHelper<TModel> ^ htmlHelper, System::Linq::Expressions::Expression<Func<TModel, TResult> ^> ^ expression, System::String ^ message, System::String ^ tag);

public static Microsoft.AspNetCore.Html.IHtmlContent ValidationMessageFor<TModel,TResult> (this Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper<TModel> htmlHelper, System.Linq.Expressions.Expression<Func<TModel,TResult>> expression, string message, string tag);

static member ValidationMessageFor : Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper<'Model> * System.Linq.Expressions.Expression<Func<'Model, 'Result>> * string * string -> Microsoft.AspNetCore.Html.IHtmlContent

<Extension()>
Public Function ValidationMessageFor(Of TModel, TResult) (htmlHelper As IHtmlHelper(Of TModel), expression As Expression(Of Func(Of TModel, TResult)), message As String, tag As String) As IHtmlContent

Type Parameters

TModel

The type of the model.

TResult

The type of the expression result.

Parameters

htmlHelper

IHtmlHelper<TModel>

The IHtmlHelper instance this method extends.

expression

Expression<Func<TModel,TResult>>

An expression to be evaluated against the current model.

message

String

The message to be displayed. If null or empty, method extracts an error string from the ModelStateDictionary object. Message will always be visible but client-side validation may update the associated CSS class.

tag

String

The tag to wrap the message in the generated HTML. Its default value is ValidationMessageElement.

Returns

IHtmlContent

A new IHtmlContent containing the tag element. An empty IHtmlContent if the expression is valid and client-side validation is disabled.

ValidationMessageFor<TModel,TResult>(IHtmlHelper<TModel>, Expression<Func<TModel,TResult>>)

Source:

HtmlHelperValidationExtensions.cs

Returns the validation message if an error exists in the ModelStateDictionary object for the specified expression.

public:
generic <typename TModel, typename TResult>
[System::Runtime::CompilerServices::Extension]
 static Microsoft::AspNetCore::Html::IHtmlContent ^ ValidationMessageFor(Microsoft::AspNetCore::Mvc::Rendering::IHtmlHelper<TModel> ^ htmlHelper, System::Linq::Expressions::Expression<Func<TModel, TResult> ^> ^ expression);

public static Microsoft.AspNetCore.Html.IHtmlContent ValidationMessageFor<TModel,TResult> (this Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper<TModel> htmlHelper, System.Linq.Expressions.Expression<Func<TModel,TResult>> expression);

static member ValidationMessageFor : Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper<'Model> * System.Linq.Expressions.Expression<Func<'Model, 'Result>> -> Microsoft.AspNetCore.Html.IHtmlContent

<Extension()>
Public Function ValidationMessageFor(Of TModel, TResult) (htmlHelper As IHtmlHelper(Of TModel), expression As Expression(Of Func(Of TModel, TResult))) As IHtmlContent

Type Parameters

TModel

The type of the model.

TResult

The type of the expression result.

Parameters

htmlHelper

IHtmlHelper<TModel>

The IHtmlHelper instance this method extends.

expression

Expression<Func<TModel,TResult>>

An expression to be evaluated against the current model.

Returns

IHtmlContent

A new IHtmlContent containing a ValidationMessageElement element. An empty IHtmlContent if the expression is valid and client-side validation is disabled.

Remarks

Method extracts an error string from the ModelStateDictionary object. Message will always be visible but client-side validation may update the associated CSS class.

ValidationMessageFor<TModel,TResult>(IHtmlHelper<TModel>, Expression<Func<TModel,TResult>>, String)

Source:

HtmlHelperValidationExtensions.cs

Returns the validation message if an error exists in the ModelStateDictionary object for the specified expression.

public:
generic <typename TModel, typename TResult>
[System::Runtime::CompilerServices::Extension]
 static Microsoft::AspNetCore::Html::IHtmlContent ^ ValidationMessageFor(Microsoft::AspNetCore::Mvc::Rendering::IHtmlHelper<TModel> ^ htmlHelper, System::Linq::Expressions::Expression<Func<TModel, TResult> ^> ^ expression, System::String ^ message);

public static Microsoft.AspNetCore.Html.IHtmlContent ValidationMessageFor<TModel,TResult> (this Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper<TModel> htmlHelper, System.Linq.Expressions.Expression<Func<TModel,TResult>> expression, string message);

static member ValidationMessageFor : Microsoft.AspNetCore.Mvc.Rendering.IHtmlHelper<'Model> * System.Linq.Expressions.Expression<Func<'Model, 'Result>> * string -> Microsoft.AspNetCore.Html.IHtmlContent

<Extension()>
Public Function ValidationMessageFor(Of TModel, TResult) (htmlHelper As IHtmlHelper(Of TModel), expression As Expression(Of Func(Of TModel, TResult)), message As String) As IHtmlContent

Type Parameters

TModel

The type of the model.

TResult

The type of the expression result.

Parameters

htmlHelper

IHtmlHelper<TModel>

The IHtmlHelper instance this method extends.

expression

Expression<Func<TModel,TResult>>

An expression to be evaluated against the current model.

message

String

The message to be displayed. If null or empty, method extracts an error string from the ModelStateDictionary object. Message will always be visible but client-side validation may update the associated CSS class.

Returns

IHtmlContent

A new IHtmlContent containing a ValidationMessageElement element. An empty IHtmlContent if the expression is valid and client-side validation is disabled.