C
C#•3w ago
Carlos Saraiva

dotnet minimal api extension method for logic validation

Hey guys I have three if statements that are repeated too often in many endpoints, how can I make an extension method to use on my endpoints? here is the current code 
c#
 app.MapPost(
            "create-income-register",
            [Authorize]
            async (
                CancellationToken token,
                [FromBody]
                CreateIncomeRegisterRequest request,
                [FromServices]
                IRegisterService registerService
            ) => 
            {
                if (!RegisterType.CheckIfIsValidType(request.Type, out bool isTransfer))
                {
                    throw new InvalidRegisterTypeException();
                }

                if(!RegisterRepetitionType.CheckIfIsValidType(request.RepetitionType))
                {
                    throw new InvalidRegisterRepetitionTypeException();
                }
                
                if(!Periodicities.CheckIfIsValidType(request.Periodicity))
                {
                    throw new InvalidPeriodicityException();
                }

                await registerService.CreateIncomeRegister(request, token);
                return Results.Ok();
            }
        );
c#
 app.MapPost(
            "create-income-register",
            [Authorize]
            async (
                CancellationToken token,
                [FromBody]
                CreateIncomeRegisterRequest request,
                [FromServices]
                IRegisterService registerService
            ) => 
            {
                if (!RegisterType.CheckIfIsValidType(request.Type, out bool isTransfer))
                {
                    throw new InvalidRegisterTypeException();
                }

                if(!RegisterRepetitionType.CheckIfIsValidType(request.RepetitionType))
                {
                    throw new InvalidRegisterRepetitionTypeException();
                }
                
                if(!Periodicities.CheckIfIsValidType(request.Periodicity))
                {
                    throw new InvalidPeriodicityException();
                }

                await registerService.CreateIncomeRegister(request, token);
                return Results.Ok();
            }
        );
and I want it to be something like: 
c#
        app.MapPost(
            "create-income-register",
            [Authorize]
            async (
                CancellationToken token,
                [FromBody]
                CreateIncomeRegisterRequest request,
                [FromServices]
                IRegisterService registerService
            ) => 
            {
                await registerService.CreateIncomeRegister(request, token);
                return Results.Ok();
            }
        ).WithRegisterValidation();
c#
        app.MapPost(
            "create-income-register",
            [Authorize]
            async (
                CancellationToken token,
                [FromBody]
                CreateIncomeRegisterRequest request,
                [FromServices]
                IRegisterService registerService
            ) => 
            {
                await registerService.CreateIncomeRegister(request, token);
                return Results.Ok();
            }
        ).WithRegisterValidation();
Thanks!

message.txt

message.txt

3 Replies
Angius
Angius•3w ago
Use a middleware or a filter? Make an IEndpointFilter and use it on the endpoints that need it with .AddEndpointFilter<T>()
Sossenbinder
Sossenbinder•3w ago
+1 for filters, seems like the best option here
Sossenbinder
Sossenbinder•3w ago

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