Handling server exceptions with Breeze SaveChanges () Method

Question

How to Handling server exceptions with Breeze SaveChanges () Method and Custom Error Throwed ..?

Salman Beg · Answer

Hi. First of all, when your code runs first it will come to the SaveChanges(), after that it will goto the Validate() and in that Validate() you are always returning result as false, even if you are not checking whether the data is right/wrong. So in validate() always it returns false and it will never hit to the catch. So now in your SaveChanges() you receive as false, so by default it will go to the else condition and always it will throw Exception as "not valid data". To Catch the actual error change your code like this, [HttpPost] public SaveResult SaveChanges(JObject saveBundle) { if(Validata(saveBundle) == true) { try { return _repository.SaveChanges(saveBundle); } catch(Exception ex) {//put a breakpoint in this line to check the actual error } } else { throw new Exception("not valid data"); } } private Boolean Validata(JObject data) { Boolean result = false; try { //Here you need to validate the data whether it is correct or not. If you don't want to validate then, Don't always return false else return true. return result; } catch (Exception) { return result; } } I think after doing all these changes, you will not receive Failed to add item, please refresh and try again this error. Thanks.

Bhavesh Ghul · Answer

Hello Salman Sir I have Return => Failed to add item, please refresh and try again this error but my requirement is custom error but every time this error return so please help me, this error which place passing in my breeze code // ~/breeze/todos/SaveChanges [HttpPost] public SaveResult SaveChanges(JObject saveBundle) { if (Validata(saveBundle) == true ) { return _repository.SaveChanges(saveBundle); } else { throw new Exception( "not valid data" ); } } private Boolean Validata(JObject data) { Boolean result = false ; try { return result; } catch (Exception) { return result; } } above code throw new Exception("not valid data"); this error return but my browser always show Failed to add item, please refresh and try again this error. => https://stackoverflow.com/questions/54401692/how-to-breeze-custom-error-throw-in-asp-net above link writed my code so please more refarnce show this link.

Salman Beg · Answer

Hi. Can you put a debugger and check what exception you are getting and let me know the exception so that I can help you. Thanks.

Sanwar Ranwa · Answer

Hello Bhavesh Please check these Links https://stackoverflow.com/questions/30748808/handling-server-exceptions-with-breeze-savechanges-method http://breeze.github.io/doc-net/ef-serverside-validation.html https://github.com/Breeze/breeze.server.net/blob/master/Tests/Test.WebApi2.EF6/Controllers/NorthwindIBModelController.cs