TryUpdateModel(TModel) Method (TModel, String, IValueProvider)

Controller.TryUpdateModel(Of TModel) Method (TModel, String, IValueProvider)

Updates the specified model instance using values from the value provider and a prefix.

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

Protected Friend Function TryUpdateModel(Of TModel As Class) ( _
	model As TModel, _
	prefix As String, _
	valueProvider As IValueProvider _
) As Boolean
Dim model As TModel
Dim prefix As String
Dim valueProvider As IValueProvider
Dim returnValue As Boolean

returnValue = Me.TryUpdateModel(model, _
	prefix, valueProvider)

Type Parameters


The type of the model object.


Type: TModel
The model instance to update.
Type: System.String
The prefix to use when looking up values in the value provider.
Type: System.Web.Mvc.IValueProvider
A dictionary of values that is used to update the model.

Return Value

Type: System.Boolean
true if the update is successful; otherwise, false.

The [Overload:System.Web.Mvc.Controller.TryUpdateModel``1] method is like the [Overload:System.Web.Mvc.Controller.UpdateModel``1] method except that the [Overload:System.Web.Mvc.Controller.TryUpdateModel``1] method does not throw an InvalidOperationException exception if the updated model state is not valid.

For more information model validation, see the entry Input Validation vs. Model Validation in ASP.NET MVC on Brad Wilson's blog.

Security noteSecurity Note:

Use one of the [Overload:System.Web.Mvc.Controller.TryUpdateModel``1] methods that takes either a list of properties to include (a whitelist) or a list of properties to exclude (a blacklist). If no explicit whitelist or blacklist is passed, the [Overload:System.Web.Mvc.Controller.TryUpdateModel``1] method tries to update every public property in the model for which there is a corresponding value in the request. A malicious user could exploit this in order to update properties that you do not intend to provide access to.

© 2015 Microsoft