How to use [FromHeader] attribute with custom model binding in Asp.Net Core 2.2

How to use [FromHeader] attribute with custom model binding in Asp.Net Core 2.2

To use the [FromHeader] attribute with custom model binding in Asp.Net Core 2.2, you can create a custom model binder that implements the IModelBinder interface, and use it as a parameter in your action method. Here's an example:

  • First, create a custom model binder by implementing the IModelBinder interface. In this example, we will create a custom model binder for a MyCustomHeaderModel class that retrieves a value from a custom header called X-MyCustomHeader.
public class MyCustomHeaderModelBinder : IModelBinder { public Task BindModelAsync(ModelBindingContext bindingContext) { // Get the value of the X-MyCustomHeader header string value = bindingContext.HttpContext.Request.Headers["X-MyCustomHeader"]; // Set the model value bindingContext.Result = ModelBindingResult.Success(new MyCustomHeaderModel { Value = value }); return Task.CompletedTask; } }
  • Add the MyCustomHeaderModelBinder to the list of model binders in the ConfigureServices method of your Startup.cs file:
services.AddControllers(options => { options.ModelBinderProviders.Insert(0, new BinderTypeModelBinderProvider(typeof(MyCustomHeaderModel), new MyCustomHeaderModelBinder())); });
  • Create an action method that takes a MyCustomHeaderModel parameter with the [FromHeader] attribute:
[HttpGet] public IActionResult GetMyCustomHeaderValue([FromHeader] MyCustomHeaderModel myCustomHeaderModel) { return Ok($"The value of X-MyCustomHeader is: {myCustomHeaderModel.Value}"); }

When this action method is called, the MyCustomHeaderModelBinder will be used to bind the value of the X-MyCustomHeader header to a MyCustomHeaderModel object, which will then be passed to the action method as a parameter with the [FromHeader] attribute.

Examples

  1. "ASP.NET Core 2.2 custom model binding for [FromHeader]"

    • Description: Learn how to create a custom model binder for handling [FromHeader] attribute in ASP.NET Core 2.2.
    • Code:
      public class CustomHeaderModelBinder : IModelBinder { // Implement custom model binding logic } // In your controller action public IActionResult MyAction([FromHeader(BinderType = typeof(CustomHeaderModelBinder))] string customHeader) { // Action logic }

  2. "ASP.NET Core 2.2 [FromHeader] with custom model binder example"

    • Description: Explore a practical example of using a custom model binder with [FromHeader] in ASP.NET Core 2.2.
    • Code:
      public class CustomHeaderModelBinder : IModelBinder { // Implement custom model binding logic } // In your controller action public IActionResult MyAction([FromHeader(BinderType = typeof(CustomHeaderModelBinder))] string customHeader) { // Action logic }

  3. "Implementing custom model binding for header parameters in ASP.NET Core 2.2"

    • Description: Step-by-step guide on implementing custom model binding for header parameters with [FromHeader].
    • Code:
      public class CustomHeaderModelBinder : IModelBinder { // Implement custom model binding logic } // In your controller action public IActionResult MyAction([FromHeader(BinderType = typeof(CustomHeaderModelBinder))] string customHeader) { // Action logic }

  4. "ASP.NET Core 2.2 custom model binding for multiple headers"

    • Description: Extend the custom model binder to handle multiple headers with [FromHeader] in ASP.NET Core 2.2.
    • Code:
      public class CustomHeaderModelBinder : IModelBinder { // Implement custom model binding logic for multiple headers } // In your controller action public IActionResult MyAction( [FromHeader(BinderType = typeof(CustomHeaderModelBinder))] string header1, [FromHeader(BinderType = typeof(CustomHeaderModelBinder))] string header2) { // Action logic }

  5. "ASP.NET Core 2.2 custom model binding for complex header object"

    • Description: Handle custom model binding for a complex header object with [FromHeader] in ASP.NET Core 2.2.
    • Code:
      public class CustomHeaderModelBinder : IModelBinder { // Implement custom model binding logic for a complex header object } // In your controller action public IActionResult MyAction( [FromHeader(BinderType = typeof(CustomHeaderModelBinder))] CustomHeaderObject customHeader) { // Action logic }

  6. "ASP.NET Core 2.2 custom model binding for nullable header parameters"

    • Description: Address nullable header parameters in the custom model binder for [FromHeader] in ASP.NET Core 2.2.
    • Code:
      public class CustomHeaderModelBinder : IModelBinder { // Implement custom model binding logic for nullable headers } // In your controller action public IActionResult MyAction( [FromHeader(BinderType = typeof(CustomHeaderModelBinder))] string? nullableHeader) { // Action logic }

  7. "Handling default values with custom model binding for [FromHeader] in ASP.NET Core 2.2"

    • Description: Manage default values in the custom model binder for [FromHeader] parameters in ASP.NET Core 2.2.
    • Code:
      public class CustomHeaderModelBinder : IModelBinder { // Implement custom model binding logic with default values } // In your controller action public IActionResult MyAction( [FromHeader(BinderType = typeof(CustomHeaderModelBinder))] string customHeader = "DefaultValue") { // Action logic }

  8. "ASP.NET Core 2.2 custom model binding for header parameters with validation"

    • Description: Add validation to the custom model binder for [FromHeader] parameters in ASP.NET Core 2.2.
    • Code:
      public class CustomHeaderModelBinder : IModelBinder { // Implement custom model binding logic with validation } // In your controller action public IActionResult MyAction( [FromHeader(BinderType = typeof(CustomHeaderModelBinder))] string customHeader) { // Action logic }

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