DEV Community

Sardar Mudassar Ali Khan
Sardar Mudassar Ali Khan

Posted on

Accessing model metadata from custom templated helpers in mvc

In ASP.NET MVC, you can access model metadata from custom templated helpers by using the ViewDataDictionary object. The ViewDataDictionary contains the model and other data associated with the view, including the model's metadata.

Here's an example of how you can access the model metadata from a custom templated helper in ASP.NET MVC:

  1. Create a custom templated helper method in a static class:
public static class CustomHelpers
    public static MvcHtmlString CustomTemplateFor<TModel, TValue>(this HtmlHelper<TModel> html, Expression<Func<TModel, TValue>> expression)
        ModelMetadata metadata = ModelMetadata.FromLambdaExpression(expression, html.ViewData);
        // Access model metadata properties, e.g. metadata.PropertyName, metadata.DisplayName, etc.

        // Generate HTML for the custom template
        // ...

        return MvcHtmlString.Create(/* custom template HTML */);
Enter fullscreen mode Exit fullscreen mode
  1. In your view, import the namespace where the CustomHelpers class is located:
@using YourNamespace.CustomHelpers
Enter fullscreen mode Exit fullscreen mode
  1. Use the CustomTemplateFor helper method to render the custom template for a specific model property:
@Html.CustomTemplateFor(model => model.PropertyName)
Enter fullscreen mode Exit fullscreen mode

Inside the CustomTemplateFor method, you can use the ModelMetadata object to access various properties of the model, such as PropertyName, DisplayName, IsRequired, and so on. These properties allow you to customize the generated HTML based on the model's metadata.

Make sure that your custom templated helper method is located in a namespace that is properly imported in your view. Also, ensure that you have the necessary using directives in your code file, such as System.Web.Mvc and any other relevant namespaces.

By accessing the model metadata within your custom templated helpers, you can dynamically generate HTML based on the properties of the model, providing a flexible and customizable rendering mechanism in ASP.NET MVC.

Top comments (0)