netcore/System.Private.CoreLib/shared/System/Guid.Windows.cs

   1 // Licensed to the .NET Foundation under one or more agreements.
   2 // The .NET Foundation licenses this file to you under the MIT license.
   3 // See the LICENSE file in the project root for more information.
   4
   5 namespace System
   6 {
   7     public partial struct Guid
   8     {
   9         public static Guid NewGuid()
  10         {
  11             // CoCreateGuid should never return Guid.Empty, since it attempts to maintain some
  12             // uniqueness guarantees.
  13
  14             Guid g;
  15             int hr = Interop.Ole32.CoCreateGuid(out g);
  16             // We don't expect that this will ever throw an error, none are even documented, and so we don't want to pull
  17             // in the HR to ComException mappings into the core library just for this so we will try a generic exception if
  18             // we ever hit this condition.
  19             if (hr != 0)
  20             {
  21                 Exception ex = new Exception();
  22                 ex.HResult = hr;
  23                 throw ex;
  24             }
  25             return g;
  26         }
  27     }
  28 }