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Question by harti177 · Jan 08, 2021 at 02:30 AM · linqenumerate

Datatable.AsEnumerable()

Datatable.AsEnumerable() giving me the error NullReferenceException: Object reference not set to an instance of an object

 using UnityEngine;
 using System.Data;
 using System.Linq;
 using System;
 
 public class CAS_Test : MonoBehaviour
 {
     // Start is called before the first frame update
     void Start()
     {
         DataTable testTable = new DataTable("testTable");
         Console.WriteLine(testTable.AsEnumerable());
     }
 }

Error

NullReferenceException: Object reference not set to an instance of an object System.Data.DataTableExtensions.AsEnumerable (System.Data.DataTable source) (at :0) CAS_Test.Start () (at Assets/CAS_Test.cs:12)

I have also tested with data in the data table. This happens only in Unity . I tested in with a c# compiler and the two lines works.

I need this to use Linq query.

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avatar image sacredgeometry · Jan 08, 2021 at 06:44 AM 0
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What is the actual exception being logged. Are you sure it's that line? The docs seem to think that it doesn't throw that exception.

https://docs.microsoft.com/en-us/dotnet/api/system.data.datatableextensions.asenumerable?view=net-5.0


I mean I cant imagine there is a case in a .net provided class where construction fails. Especially in that manner (if it's even possible at all to set this to a null reference in the constructor (I am pretty sure it isn't)).

avatar image harti177 sacredgeometry · Jan 08, 2021 at 06:44 PM 0
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It is in that line. I have updated the question with complete code and error message.

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Answer by harti177 · Jan 08, 2021 at 07:01 PM

Using ".Net 4.x" seems to resolve the issue.

The setting is under ProjectSetting -> Player -> OtherSettings -> Api Compatibility level

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