Global exception Handling in ASP. NET Core Webapi

In. NET core, MVC and WEBAPI have been combined to inherit the controller, but when it comes to handling errors, MVC returns an error page to the browser, WEBAPI returns JSON or XML instead of HTML. Useexceptionhandler Middleware can handle global exceptions

App. Useexceptionhandler (Options =>{    options. Run (Async context =    {        context. Response.statuscode = (int) httpstatuscode.internalservererror;        Context. Response.ContentType = "Application/json";        var ex = context. Features.get<iexceptionhandlerfeature> ();        if (ex! = null)        {            //todo custom response structure Consistency            string text = Jsonconvert.serializeobject (new            {                message = ex. Error.message            });            Await the context. Response.writeasync (text);});    });

Open ValuesController.cs, modify code, manually throw an exception

[Httpget]public ienumerable<string> Get () {    int a= 1;    int b = a/0;    return new string[] {"value1", "value2"};}

Run the application you should be able to see

Another way is to use Iexceptionfilter

public class customexceptionfilter:microsoft.aspnetcore.mvc.filters.iexceptionfilter{public    void Onexception ( Exceptioncontext context)    {        context. HttpContext.Response.StatusCode = (int) httpstatuscode.internalservererror;        Context. HttpContext.Response.ContentType = "Application/json";        var ex = context. Exception;        if (ex! = null)        {            //todo custom response structure Consistency            string text = Jsonconvert.serializeobject (new            {                message = ex. Message            });            Context. HttpContext.Response.WriteAsync (text);}}    }

Finally, add our filters in the Startup.cs configureservices method

public void Configureservices (iservicecollection services) {    services. ADDMVC (options =        options. Filters.add (typeof (Customexceptionfilter));}    );

In this article we use built-in middleware and built-in exception filters to handle exceptions.

Global exception Handling in ASP. NET Core Webapi