DecompiledProgram.cs

// Decompiled with JetBrains decompiler
// Type: AsyncAwaitTest.Program
// Assembly: AsyncAwaitTest, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
// MVID: 52DF839B-9B18-40C2-9E30-2E3827E07665
// Assembly location: C:\code\AsyncAwaitTest\AsyncAwaitTest\bin\Debug\netcoreapp3.1\AsyncAwaitTest.dll
// Compiler-generated code is shown

using System;
using System.Diagnostics;
using System.IO;
using System.Runtime.CompilerServices;
using System.Threading;
using System.Threading.Tasks;

namespace AsyncAwaitTest
{
  internal class Program
  {
    private static void Main(string[] args)
    {
      Program.PrintWithThreadID("Starting Program");
      Console.WriteLine();
      Console.WriteLine("____Got Result: " + Program.ReadFileHierarchy("file1a"));
      Console.WriteLine();
      // ISSUE: method pointer
      Console.WriteLine("____Got Simple Task Result: " + Task.Run<string>(Program.\u003C\u003Ec.\u003C\u003E9__0_0 ?? (Program.\u003C\u003Ec.\u003C\u003E9__0_0 = new Func<string>((object) Program.\u003C\u003Ec.\u003C\u003E9, __methodptr(\u003CMain\u003Eb__0_0)))).GetAwaiter().GetResult());
      Console.WriteLine();
      Task<string>[] taskArray = new Task<string>[2]
      {
        Program.ReadFileHierarchyAsync("file1a"),
        Program.ReadFileHierarchyAsync("file1b")
      };
      foreach (string str in Task.WhenAll<string>(taskArray).GetAwaiter().GetResult())
        Console.WriteLine("____Combined Task Result: " + str);
    }

    private static string ReadFileHierarchy(string fileOneName)
    {
      Program.PrintWithThreadID("Starting Read");
      fileOneName += ".txt";
      string path1 = File.ReadAllText(fileOneName) + ".txt";
      Program.PrintWithThreadID("Got Second File Name: " + path1);
      string path2 = File.ReadAllText(path1) + ".txt";
      Program.PrintWithThreadID("Got Third File Name: " + path2);
      return File.ReadAllText(path2);
    }

    [AsyncStateMachine(typeof (Program.\u003CReadFileHierarchyAsync\u003Ed__2))]
    [DebuggerStepThrough]
    private static Task<string> ReadFileHierarchyAsync(string fileOneName)
    {
      Program.\u003CReadFileHierarchyAsync\u003Ed__2 stateMachine = new Program.\u003CReadFileHierarchyAsync\u003Ed__2();
      stateMachine.\u003C\u003Et__builder = AsyncTaskMethodBuilder<string>.Create();
      stateMachine.fileOneName = fileOneName;
      stateMachine.\u003C\u003E1__state = -1;
      stateMachine.\u003C\u003Et__builder.Start<Program.\u003CReadFileHierarchyAsync\u003Ed__2>(ref stateMachine);
      return stateMachine.\u003C\u003Et__builder.Task;
    }

    private static void PrintWithThreadID(string text)
    {
      Console.WriteLine(text + " on thread: " + Thread.CurrentThread.ManagedThreadId.ToString());
    }

    public Program()
    {
      base.\u002Ector();
    }

    [CompilerGenerated]
    [Serializable]
    private sealed class \u003C\u003Ec
    {
      public static readonly Program.\u003C\u003Ec \u003C\u003E9;
      public static Func<string> \u003C\u003E9__0_0;

      static \u003C\u003Ec()
      {
        Program.\u003C\u003Ec.\u003C\u003E9 = new Program.\u003C\u003Ec();
      }

      public \u003C\u003Ec()
      {
        base.\u002Ector();
      }

      internal string \u003CMain\u003Eb__0_0()
      {
        return Program.ReadFileHierarchy("file1a");
      }
    }

    [CompilerGenerated]
    private sealed class \u003CReadFileHierarchyAsync\u003Ed__2 : IAsyncStateMachine
    {
      public int \u003C\u003E1__state;
      public AsyncTaskMethodBuilder<string> \u003C\u003Et__builder;
      public string fileOneName;
      private Task<string> \u003CfileReadTask\u003E5__1;
      private string \u003CfileTwoName\u003E5__2;
      private string \u003CfileThreeName\u003E5__3;
      private string \u003CfileThreeContents\u003E5__4;
      private string \u003C\u003Es__5;
      private string \u003C\u003Es__6;
      private string \u003C\u003Es__7;
      private TaskAwaiter<string> \u003C\u003Eu__1;

      public \u003CReadFileHierarchyAsync\u003Ed__2()
      {
        base.\u002Ector();
      }

      void IAsyncStateMachine.MoveNext()
      {
        int num1 = this.\u003C\u003E1__state;
        string fileThreeContents54;
        try
        {
          TaskAwaiter<string> awaiter1;
          int num2;
          TaskAwaiter<string> awaiter2;
          TaskAwaiter<string> awaiter3;
          switch (num1)
          {
            case 0:
              awaiter1 = this.\u003C\u003Eu__1;
              this.\u003C\u003Eu__1 = new TaskAwaiter<string>();
              this.\u003C\u003E1__state = num2 = -1;
              break;
            case 1:
              awaiter2 = this.\u003C\u003Eu__1;
              this.\u003C\u003Eu__1 = new TaskAwaiter<string>();
              this.\u003C\u003E1__state = num2 = -1;
              goto label_8;
            case 2:
              awaiter3 = this.\u003C\u003Eu__1;
              this.\u003C\u003Eu__1 = new TaskAwaiter<string>();
              this.\u003C\u003E1__state = num2 = -1;
              goto label_11;
            default:
              Program.PrintWithThreadID("Starting Async Read");
              this.fileOneName += ".txt";
              this.\u003CfileReadTask\u003E5__1 = File.ReadAllTextAsync(this.fileOneName, new CancellationToken());
              awaiter1 = this.\u003CfileReadTask\u003E5__1.GetAwaiter();
              if (!awaiter1.IsCompleted)
              {
                this.\u003C\u003E1__state = num2 = 0;
                this.\u003C\u003Eu__1 = awaiter1;
                Program.\u003CReadFileHierarchyAsync\u003Ed__2 stateMachine = this;
                this.\u003C\u003Et__builder.AwaitUnsafeOnCompleted<TaskAwaiter<string>, Program.\u003CReadFileHierarchyAsync\u003Ed__2>(ref awaiter1, ref stateMachine);
                return;
              }
              break;
          }
          this.\u003C\u003Es__5 = awaiter1.GetResult();
          this.\u003CfileTwoName\u003E5__2 = this.\u003C\u003Es__5;
          this.\u003C\u003Es__5 = (string) null;
          this.\u003CfileTwoName\u003E5__2 += ".txt";
          Program.PrintWithThreadID("Got Second File Name Async: " + this.\u003CfileTwoName\u003E5__2);
          awaiter2 = File.ReadAllTextAsync(this.\u003CfileTwoName\u003E5__2, new CancellationToken()).GetAwaiter();
          if (!awaiter2.IsCompleted)
          {
            this.\u003C\u003E1__state = num2 = 1;
            this.\u003C\u003Eu__1 = awaiter2;
            Program.\u003CReadFileHierarchyAsync\u003Ed__2 stateMachine = this;
            this.\u003C\u003Et__builder.AwaitUnsafeOnCompleted<TaskAwaiter<string>, Program.\u003CReadFileHierarchyAsync\u003Ed__2>(ref awaiter2, ref stateMachine);
            return;
          }
label_8:
          this.\u003C\u003Es__6 = awaiter2.GetResult();
          this.\u003CfileThreeName\u003E5__3 = this.\u003C\u003Es__6;
          this.\u003C\u003Es__6 = (string) null;
          this.\u003CfileThreeName\u003E5__3 += ".txt";
          Program.PrintWithThreadID("Got Third File Name Async: " + this.\u003CfileThreeName\u003E5__3);
          awaiter3 = File.ReadAllTextAsync(this.\u003CfileThreeName\u003E5__3, new CancellationToken()).GetAwaiter();
          if (!awaiter3.IsCompleted)
          {
            this.\u003C\u003E1__state = num2 = 2;
            this.\u003C\u003Eu__1 = awaiter3;
            Program.\u003CReadFileHierarchyAsync\u003Ed__2 stateMachine = this;
            this.\u003C\u003Et__builder.AwaitUnsafeOnCompleted<TaskAwaiter<string>, Program.\u003CReadFileHierarchyAsync\u003Ed__2>(ref awaiter3, ref stateMachine);
            return;
          }
label_11:
          this.\u003C\u003Es__7 = awaiter3.GetResult();
          this.\u003CfileThreeContents\u003E5__4 = this.\u003C\u003Es__7;
          this.\u003C\u003Es__7 = (string) null;
          fileThreeContents54 = this.\u003CfileThreeContents\u003E5__4;
        }
        catch (Exception ex)
        {
          this.\u003C\u003E1__state = -2;
          this.\u003CfileReadTask\u003E5__1 = (Task<string>) null;
          this.\u003CfileTwoName\u003E5__2 = (string) null;
          this.\u003CfileThreeName\u003E5__3 = (string) null;
          this.\u003CfileThreeContents\u003E5__4 = (string) null;
          this.\u003C\u003Et__builder.SetException(ex);
          return;
        }
        this.\u003C\u003E1__state = -2;
        this.\u003CfileReadTask\u003E5__1 = (Task<string>) null;
        this.\u003CfileTwoName\u003E5__2 = (string) null;
        this.\u003CfileThreeName\u003E5__3 = (string) null;
        this.\u003CfileThreeContents\u003E5__4 = (string) null;
        this.\u003C\u003Et__builder.SetResult(fileThreeContents54);
      }

      [DebuggerHidden]
      void IAsyncStateMachine.SetStateMachine(IAsyncStateMachine stateMachine)
      {
      }
    }
  }
}