move dotnet-run

src/dotnet/AppliedOptionExtensions.cs

@@ -17,5 +17,14 @@ namespace Microsoft.DotNet.Cli
                 .Select(o => o.Value<T>())
                 .SingleOrDefault();
         }
+
+        public static string SingleArgumentOrDefault(this AppliedOption parseResult, string alias)
+        {
+            return parseResult
+                .AppliedOptions
+                .Where(o => o.HasAlias(alias))
+                .Select(o => o.Arguments.Single())
+                .SingleOrDefault();
+        }
     }
-}
+}

src/dotnet/ArgumentForwardingExtensions.cs

@@ -38,7 +38,12 @@ namespace Microsoft.DotNet.Cli
                 _value = value;
             }
 
-            public override string ToString() => _value;
+            public override string ToString() => _value;  
+            
+            public static explicit operator string(ForwardedArgument argument)
+            {
+                return argument.ToString();
+            }
         }
     }
-}
+}

src/dotnet/commands/dotnet-run/RunCommandParser.cs

@@ -15,16 +15,16 @@ namespace Microsoft.DotNet.Cli
                 "run",
                 ".NET Run Command",
                 Accept.ZeroOrMoreArguments
-                .MaterializeAs(o =>
-                {
-                    return new RunCommand()
+                    .MaterializeAs(o =>
                     {
-                        Configuration = o.ValueOrDefault<string>("--configuration"),
-                        Framework = o.ValueOrDefault<string>("--framework"),
-                        Project = o.ValueOrDefault<string>("--project"),
-                        Args = (IReadOnlyList<string>)o.Arguments
-                    };
-                }),
+                        return new RunCommand()
+                        {
+                            Configuration = o.SingleArgumentOrDefault("--configuration"),
+                            Framework = o.SingleArgumentOrDefault("--framework"),
+                            Project = o.SingleArgumentOrDefault("--project"),
+                            Args = (IReadOnlyList<string>)o.Arguments
+                        };
+                    }),
                 CommonOptions.HelpOption(),
                 CommonOptions.ConfigurationOption(),
                 CommonOptions.FrameworkOption(),

test/dotnet.Tests/ParserTests/ArgumentForwardingExtensionsTests.cs

@@ -64,4 +64,4 @@ namespace Microsoft.DotNet.Tests.ParserTests
                 .BeEquivalentTo("one");
         }
     }
-}
+}