You can apply any number of attributes to each property. In the previous example, the new class is associated with the table class in the following lines: Īpply attributes to the properties. If you are working with CLR objects directly, sometimes referred to as Plain Old CLR Object (POCO) types, you can apply the attributes directly to the model.Īssociate the new class with the table class by using the MetadataTypeAttribute attribute. The associated class must be used with EDM or LINQ-to-SQL models because CLR types cannot mark existing properties with new attributes. The associated class can have any name a convention is to append "MD" or "MetaData" to the table class name. You can use this property to test the partial class, as explained later in this topic.Ĭreate an associated class (sometimes referred to as a buddy class) that contains the properties of the partial class that represent the table. The property named NoSuchProperty is included in the class and is commented out.
'Public Property NoSuchProperty() As Object In this example, the database is represented by the MvcDA namespace. The following example shows a partial class for the Product table from the AdventureWorksLT_2008 sample database. The easiest way to make sure that the name of the partial class matches is to copy it. It is important that the class names match exactly. For more information, see How to: Customize Data Field Validation in the Data Model.Īdd a namespace declaration to the partial class that matches the namespace of the data model that you are using. To add validation using DataAnnotations attributesĪdd a class to your project to contain the partial class definitions. Messages displayed in the browser in response to validation errors The following illustration shows error messages that are automatically displayed in a browser when client-side validation fails.
#MVD DATA ANNOTATIONS CODE#
For more information, see How to: Customize Data Field Validation in the Data Model Using Custom Attributes.Ī Visual Studio project with source code is available to accompany this topic: Download. You can also create custom validation attributes.
The attributes can be used with the Entity Data Model (EDM), LINQ to SQL, and other data models. The attributes cause MVC to provide both client and server validation checks with no additional coding required by you. These attributes define common validation patterns, such as range checking and required fields.
#MVD DATA ANNOTATIONS HOW TO#
This topic illustrates how to use attributes from the namespace to specify validation for individual fields in the data model.
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