Validating an index
In that case, you can create the partial class and meta data class in Listing 4. file by applying the validator attributes to the properties of the Movie class defined in the file in Listing 4.
Figure 5: Movie class generated by Entity Framework Listing 4: Models\The file in Listing 4 contains two classes named Movie and Movie Meta Data. It corresponds to the partial class generated by the Entity Framework that is contained in the Data Model. Notice that the Movie partial class is decorated with a Metadata Type attribute that points at the Movie Meta Data class.
For example, imagine that you have created a Movie class using the Entity Framework (see Figure 5).
Imagine, furthermore, that you want to make the Movie Title and Director properties required properties. Therefore, there is no way to apply the validator attributes to the properties of the Movie class defined in the Data Model.
Data assembly included with the Data Annotations Model Binder Sample download.
Because the Id field corresponds to an Identity column, you don't want to allow users to enter a value for this field.
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Take advantage of the Data Annotation Model Binder to perform validation within an ASP. Learn how to use the different types of validator attributes and work with them in the Microsoft Entity Framework. Finally, the Unit Price property must match a regular expression pattern that represents a currency amount.
In this tutorial, you learn how to use the Data Annotation validators to perform validation in an ASP. The advantage of using the Data Annotation validators is that they enable you to perform validation simply by adding one or more attributes – such as the Required or String Length attribute – to a class property. Listing 1: Models\The Product class illustrates how to use one additional attribute: the Display Name attribute.
The Movie Meta Data class contains proxy properties for the properties of the Movie class.
The validator attributes are applied to the properties of the Movie Meta Data class.