Model Binding using imodelbinder in .Net Core

Refer Below Articles

https://www.c-sharpcorner.com/article/custom-model-binding-in-asp-net-mvc/

https://www.c-sharpcorner.com/article/custom-model-binding-in-asp-net-core-mvc/

In .NET Core, model binding is a powerful feature that allows you to automatically map incoming request data to the properties of a model class. By default, .NET Core provides built-in model binders for basic types like strings, integers, and booleans. However, there may be scenarios where you need to implement custom model binding logic for complex types or specific requirements.

To implement model binding using IModelBinder in .NET Core, you need to follow these steps:

1. Create a custom model binder class that implements the IModelBinder interface. This interface defines a single method called BindModelAsync that you need to implement. This method is responsible for binding the request data to the model.

2. In the BindModelAsync method, you can access the request data from the ValueProvider parameter and perform any necessary validation or transformation logic. You can then set the bound model object using the BindingContext.Result property.

Here's an example of a custom model binder for a Person class:

public class PersonModelBinder : IModelBinder
{
    public Task BindModelAsync(ModelBindingContext bindingContext)
    {
        // Access request data from bindingContext.ValueProvider
        // Perform validation and transformation logic
        // Set the bound model object using bindingContext.Result

        return Task.CompletedTask;
    }
}

1. Register the custom model binder in the Startup.cs file by adding it to the MvcOptions in the ConfigureServices method:

2. services.AddMvc(options =>
   {
       options.ModelBinderProviders.Insert(0, new PersonModelBinderProvider());
   });
   

3. Optionally, you can create a custom model binder provider class that implements the IModelBinderProvider interface. This allows you to specify the conditions under which the custom model binder should be used. In the example above, we assumed the existence of a PersonModelBinderProvider class.

I fiound this resource quite useful. May be it helps

https://medium.com/@ridikk12/net-core-model-binders-a91396788aed

Hello Abhi,

Please refer this link which will help you to create custom model binder in .net core mvc,

https://www.c-sharpcorner.com/article/custom-model-binding-in-asp-net-core-mvc/