C#•3mo ago

Middleware Error

Guys, I created a middleware to handle exceptions and added it to "Program.cs" but it is giving this error when running. .NET 8 Error:

"System.InvalidOperationException: 'An error occurred when configuring the exception handler middleware. Either the 'ExceptionHandlingPath' or the 'ExceptionHandler' property must be set in 'UseExceptionHandler()'. Alternatively, set one of the aforementioned properties in 'Startup.ConfigureServices' as follows: 'services.AddExceptionHandler(options => { ... });' or configure to generate a 'ProblemDetails' response in 'service.AddProblemDetails()'.'"

"System.InvalidOperationException: 'An error occurred when configuring the exception handler middleware. Either the 'ExceptionHandlingPath' or the 'ExceptionHandler' property must be set in 'UseExceptionHandler()'. Alternatively, set one of the aforementioned properties in 'Startup.ConfigureServices' as follows: 'services.AddExceptionHandler(options => { ... });' or configure to generate a 'ProblemDetails' response in 'service.AddProblemDetails()'.'"

My Code:

app.UseMiddleware<ExceptionHandlerMiddleware>();

app.UseMiddleware<ExceptionHandlerMiddleware>();

2 Replies

Kringe•3mo ago

You need to set the ExceptionHandlingPath so like the error says

        app.UseExceptionHandler("/error");

        app.UseExceptionHandler("/error");

        builder.Services.AddExceptionHandler(options => options.ExceptionHandlingPath = "/error");
        app.UseMiddleware<ExceptionHandlerMiddleware>();

        builder.Services.AddExceptionHandler(options => options.ExceptionHandlingPath = "/error");
        app.UseMiddleware<ExceptionHandlerMiddleware>();

or is this custom middleware and you accidentally using the one from microsoft

Iago•3mo ago

true, I was importing from an asp.netcore class

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Middleware Error