Implementation of Task.FromResult<TResult>(TResult result)

Author: Michael

JSIL.Libraries/Includes/Bootstrap/Async/Classes/System.Threading.Tasks.Task.js

@@ -137,6 +137,16 @@ JSIL.ImplementExternals("System.Threading.Tasks.Task", function ($) {
       return tcs.Task;
     }
   );
+
+  $.Method({ Static: true, Public: true }, "FromResult",
+      new JSIL.MethodSignature($jsilcore.TypeRef("System.Threading.Tasks.Task`1", ["!!0"]), ["!!0"], ["TResult"]),
+      function(TResult, result) {
+          var task = new ($jsilcore.System.Threading.Tasks.Task$b1.Of(TResult));
+          task.status = $jsilcore.System.Threading.Tasks.TaskStatus.RanToCompletion;
+          task.result = result;
+          return task;
+      }
+  );
 });
 
 JSIL.ImplementExternals("System.Threading.Tasks.Task`1", function ($) {
@@ -263,6 +273,10 @@ JSIL.MakeType({
     new JSIL.MethodSignature($jsilcore.TypeRef("System.Runtime.CompilerServices.TaskAwaiter"), [], [])
   );
 
+  $.ExternalMethod({ Static: true, Public: true }, "FromResult",
+      new JSIL.MethodSignature($jsilcore.TypeRef("System.Threading.Tasks.Task`1", ["!!0"]), ["!!0"], ["TResult"])
+  );
+
   $.Property({ Static: false, Public: true }, "Exception", $jsilcore.TypeRef("System.AggregateException"));
 
   $.Property({ Static: false, Public: true, Virtual: true }, "IsCompleted", $.Boolean);

Tests/SimpleTestCases/Task_FromResult.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Threading.Tasks;
+
+public static class Program {
+    public static void Main (string[] args)
+    {
+        var task = Task.FromResult(new A(true));
+        Console.WriteLine(task.GetType().FullName);
+        Console.WriteLine(task.Status);
+        Console.WriteLine(task.Result.Value ? "true" : "false");
+    }
+}
+
+public class A
+{
+    public readonly bool Value;
+
+    public A(bool value)
+    {
+        Value = value;
+    }
+}

Tests/SimpleTests.csproj

@@ -142,6 +142,7 @@
     <None Include="SimpleTestCases\ArrayCast.cs" />
     <None Include="SimpleTestCases\Issue913.cs" />
     <None Include="SimpleTestCases\BoxNumeric_Issue981.cs" />
+    <None Include="SimpleTestCases\Task_FromResult.cs" />
     <None Include="SimpleTestCases\NullableUnary_Issue997.cs" />
     <None Include="SimpleTestCasesForTranslatedBcl\Issue1008_MethodReturnType.cs" />
     <None Include="SimpleTestCases\GetTypeFromAssembly_Issue1035.cs" />