Strongly Typed Custom HTML Helpers In MVC

To create a strongly typed helper we need to understand what makes them different from regular HTML Helpers. Strongly typed helpers are used to pass data from the model to the helper using expression syntax. The ‘HtmlHelper<TModel>’ class is a strongly typed subclass of the ‘HtmlHelper’ class.

Creating Strongly Custom Helper

To create a strongly typed custom helper we writethe extension method for ‘HtmlHelper<TModel>’ class. We also use the following:

1. Expression:
   
   While using a strongly typed helper on view we use lambda expressions like ‘@Html.TextBoxFor(m=>m.Name)’. Expression class is used to get the model information from this lambda expression.
   
   
2. ModelMetaData:
   
   This class is used to get model information with its data from the lambda expression.
   
   Example:
   
   Add new class in MVC application and give it a meaningful name. Add one model class as User as in the following:
   
   1. public class User
   2. {
   3. public string UserName { get; set; }
   4. }

In this application add class “CustomHelper”. As we are going to createan extension method make this class static. Write the following code in class.