Please add support onError action/event in server side code #359

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1. AlekseyMartynov commented on Jun 17, 2019

   

   AlekseyMartynov

   on Jun 17, 2019

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   You can catch and handle server errors using a try-catch block:

   try {
       // Use DataSourceLoader
   } catch(Exception x) {
       // handle the error
   }
2. hype11 commented on Jun 25, 2019

   

   hype11

   on Jun 25, 2019

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   I use it in this way:
   DataSourceLoader.Load(IQueryable, DataSourceLoadOptions)
   The IQueryable is executed out of controller scope, so I cannot add a simple try-catch, because the IQueryable is executed in DevExpress logic or while serializing.
   I hope it's understandable.
3. AlekseyMartynov commented on Jun 25, 2019

   

   AlekseyMartynov

   on Jun 25, 2019

   Last edited by AlekseyMartynov

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   Now I understand that you need to catch exceptions that occur during the delayed enumeration of the result.

   Possible solutions:

   1. Force JSON serialization

   try {
       var loadResult = DataSourceLoader.Load(source, loadOptions);
       return Content(JsonConvert.SerializeObject(loadResult), "application/json");
   } catch(Exception x) {
       // TODO
       throw;
   }

   2. Force enumeration (feature request #347)

   try {
       var loadResult = DataSourceLoader.Load(source, loadOptions);
       if(loadResult.data is IQueryable)
           loadResult.data = loadResult.data.Cast<Object>().ToArray();
       return loadResult;
   } catch(Exception x) {
       // TODO
       throw;
   }

   👍React with 👍1Reacted by Steve Lemire
4. hype11 commented on Jun 27, 2019

   

   hype11

   on Jun 27, 2019

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   Thank you for your help. I implemented the executing of the Queryable. In my case I could not execute the query in all cases, because the "IsCountQuery"-request throws an exception. So in future, it would be nice to have a possiblity to add a logger function.
5. hype11

   closed this as completedon Jun 27, 2019
6. AlekseyMartynov commented on Jul 1, 2019

   

   AlekseyMartynov

   on Jul 1, 2019

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   Thank you. I updated the code snippets. Now they handle IsCountQuery errors, too.