how to handle exception with customized error message in json format in webapi in c#

Question

how to handle exception with customized error message in json format in webapi in c# also my webapi calling different one drive api like delete file , download file etc and my webapi return type like IActionResult and jsonstring

Any body can help

Answer 1

customized error format will be Json format.

Of course the response is JSON. JSON is standard in Web API these days.

Your original post asked for a "customized error message" but you did not provide an example of the JSON message. Is your expectation that the community will come up with a custom design? Then explain how the design works? That's a large ask for a support forum.

Moreover, REST error responses follow a standard and Web API provides these response out of the box. Why can't you use the responses that come with Web API? I get the feeling that you did not go through the linked tutorial which covers these basics.

At this point, it is not clear exactly what you want.

The following snippet is a ASP.NET Web API bad request response. BadRequest() has three overloads and one of the overloads is a string. You get to add what ever string you like. Is this what you're looking for???

public IHttpActionResult Get()
{
    return BadRequest("Houston, we have a problem!");
}

Answer 2

Hi @Pradyut Sinha , You can create a custom Exception Filter like below:

public class CustomExceptionFilterAttribute : ExceptionFilterAttribute { 
  public override void OnException(ExceptionContext context) 
   { 
       var exception = context.Exception; 
       context.Result = new JsonResult(exception.Message); 
   } }

Then apply the above attribute to your controller.

[Route("api/[controller]")] 
[CustomExceptionFilter] 
public class ValuesController : Controller 
{ // GET: api/values 
 [HttpGet]
 public IEnumerable<string> Get() 
{ throw new Exception("Suckers"); 
return new string[] { "value1", "value2" }; } }

For details, you can view the following documents.

Exception Handling in ASP.NET Web API

Best regards,

Lan Huang

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