ASP.NET Core 3 and React

Adding validation to updating a question

Let's add validation to the request for updating a question:

1. Open QuestionPutRequest.cs and add the following using statement:

using System.ComponentModel.DataAnnotations;

2. Add the following validation attributes:

public class QuestionPutRequest{          [StringLength(100)]    public string Title { get; set; }           public string Content { get; set; }}

We are making sure that a new title doesn't exceed 100 characters.

3. Let's run the app and give this a try by updating a question to have a very long title:

A validation error is returned as expected.

4. Stop the app running so that we're ready to add the next piece ...