+$", ErrorMessage = "Must Start with UpperCase Character")] +$", ErrorMessage = "Must be Upper Case")] In this file add the EmployeeInfo class code as below: To implement it, in the Models folder, add a new class file of name ValidationRepository.cs. Since the EmployeeInfo class generated is partial, we can write the same class in a separate class file under the same namespace. So to apply DataAnnotations, we will use the partial class feature of the C#. Step 4: We need to add DataAnnotation on properties of the EmployeeInfo class for validation, but the EmployeeInfo class is generated using the EF wizard, and it is not recommended to change the classes generated using the wizard. This creates EmployeeInfo class and ApplicationEntities class in the Models folder. In the next step of the wizard, select EmployeeInfo table as shown in the following image:Īfter completion of this wizard, the table mapping will be generated. The wizard selects Application.mdf, as shown in the following image: In this wizard, select EF Designer from Database, (Note: Since the article uses VS 2013 with Update 4, the EF wizard shows EF Designer from Database, else the option may be visible to you as Generate from Database). Step 3: In the Models folder, add a new ADO.NET EF. In this table, add some sample data as shown in the following script: In this database add the EmployeeInfo table using the following script: Step 2: In the App_Data folder add a new Sql Server database of name ‘Application.mdf’. In this solution, add an empty Web API project of name ‘WebAPI_Validation’. Step 1: Open the Free Visual Studio 2013 Community Edition and create a blank solution. In the following steps, we will be creating custom action filter to respond to validation errors occurring on the Model class, and passing it to JavaScript client. What action is to be taken on the invalidated model can be decided using code. If each field of the Model class is valid, then the ModelState sets its IsValid property to true, else false. This property validates each field of the Model class based on the DataAnnotation or any other custom validation logic. This provides the ModelState property of the ApiController base class. The Model Binding and Validation takes place during the Action Execution stage. The first priority is to the AuthorizationFilter, (if applied), followed by the Model Binding and Model Validation which gets executed with the action filters. In the Web API pipeline, after the request message processing part of the message handler runs, the filters (if applied) starts getting executed. One solution is to use an ActionFilter for validation. Since Web API services are called using JavaScript based libraries and frameworks using Ajax calls, it is challenging to integrate server-side validation with client-side, in the response message. Like in ASP.NET MVC, in Web API too, DataAnnotations provide model field error messages while implementing server-side validations. When using Web API for decoupling data access from the client application, server-side model validation becomes very important.ĭata Annotations provides a set of attributes that offers a declarative way to apply validation rules directly to a model. The HTTP action method provided in ASP.NET Web API allows you to perform GET, POST, PUT and DELETE operations.
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