MaxLength decorator is not working with int.MaxValue

Question

Given this basic GET method:

public Foo Get([FromQuery][MaxLength(int.MaxValue, ErrorMessage ="Custom error message")] int input)
{
   // DO THINGS
}

The MaxLength decorator is not working when I actually send a value bigger than int.MaxValue:

https://apiurl/foo?input=9999999999999999999

I get a System.OverflowException: 'Value was either too large or too small for an Int32.', way before it reaches the MaxLength validator, in System.Private.CoreLib

Is there an easy way to handle this error and actually return my custom Error Message or do I have to implement a custom ModelBinder?

user_10302096 · Answer

Create an custom attribute:

public class CustomNameAttribute : ActionFilterAttribute
{
    public override void OnResultExecuting(ResultExecutingContext context)
    {
        if (context.Result is BadRequestObjectResult badRequestObjectResult)
            if (badRequestObjectResult.Value is ValidationProblemDetails)
            {
                context.Result = new BadRequestObjectResult("Error message");
            }
        base.OnResultExecuting(context);
    }
}

Then add it to your method:

[CustomName]
public Foo Get([FromQuery]int input)
{
   // DO THINGS
}

MaxLength decorator is not working with int.MaxValue

1 Answers