Role of app.UseExceptionHandler in .Net core API?
Ask by Sandra Emily
Updated 29 Aug 2023
The
app.UseExceptionHandler()method in ASP.NET Core API is used to configure a custom error handling page. When an unhandled exception occurs in the application, theUseExceptionHandler()middleware will catch the exception and redirect the request to the custom error handling page.The custom error handling page can be a static HTML page or a dynamic page generated by the application. The page should display the error message to the user and provide instructions on how to resolve the error.
The
app.UseExceptionHandler()method takes two arguments:The following code shows how to configure the
app.UseExceptionHandler()middleware:C#
This code will redirect all unhandled exceptions to the
/errorpage.The following code shows how to customize the error handling behavior using a lambda expression:
C#
This code will first catch the unhandled exception and then perform some custom error handling. The custom error handling code can be used to display a different error message to the user, log the error to the application log, or take other actions.
The
app.UseExceptionHandler()middleware is an important part of any ASP.NET Core API. It helps to ensure that unhandled exceptions are handled gracefully and that users are not presented with cryptic error messages.Here are some additional things to keep in mind about the
app.UseExceptionHandler()middleware:app.UseExceptionHandler()middleware should be placed after theapp.UseRouting()middleware.app.UseExceptionHandler()middleware can be used in both the development and production environments. However, the error handling behavior may be different in each environment.app.UseExceptionHandler()middleware can be used to handle all unhandled exceptions or only specific types of exceptions.