CODEWITHSUNDEEP
.net-core
RandyDaddis
RandyDaddis

Reputation: 1050

.NET Core - The type or namespace name ‘SystemException’ could not be found

I am getting the following compilation error in a .NET Core 1.0 class library:

“The type or namespace name ‘SystemException’ could not be found (are you missing a using directive or an assembly reference?)”, code: CS0246.

project.json

 {
  "name": "Dna.Net.Core",
  "version": "1.0.0-*",

  "dependencies": {
    "Autofac": "4.1.0",
    "NETStandard.Library": "1.6.0",
    "System.Data.SqlClient": "4.1.0",
    "System.Runtime": "4.1.0",
    "System.Runtime.Serialization.Formatters": "4.0.0-rc3-24212-01",
    "System.Runtime.Serialization.Primitives": "4.1.1"
  },

  "frameworks": {
    "netstandard1.6": {
      "imports": "dnxcore50"
    }
  }
}

ISystemExceptionMessageBuilder.cs

using Dna.Net.Core.Common;
using System;

namespace Dna.Net.Core.Exceptions
{
    public partial interface ISystemExceptionMessageBuilder
    {
        CustomMessage Parse(SystemException ex);
    }
}

The Framework Guideline states “DO NOT throw Exception or SystemException”.

A search within the coreFX project shows comments in classes that have refactored away from System.SystemException.

Can / will / should I be able to catch System.SystemException in .NET Core?

Upvotes: 3

Views: 2621

Answers (2)

Thomas
Thomas

Reputation: 5270

System.SystemException is not part of .NET Core (at least not netcoreapp1.0 or netstandard1.6). However it seems scheduled for netcoreapp1.1 or netstandard1.7.

The referenced source file of the other answer was probably not compiled into the System.Runtime (or its companion System.Private.CoreLib.

Answering your question: As of today you should not be able to catch System.SystemException. For final handling you should catch System.Exception and if you are able to handle the exception, it cannot be a System.SystemException in .NET Core.

Upvotes: 3

lazy
lazy

Reputation: 531

System.SystemException exists in coreCLR - https://github.com/dotnet/coreclr/blob/master/src/mscorlib/src/System/SystemException.cs

So it is available in the mscorlib. So it can be used. But it is not recommended. As you will not get any specific information about the exception when you throw a system exception instead throw a relevant exception. System exception should be limited to system error (platform specific).

Upvotes: 0

Related Questions