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

@@ -39,6 +39,11 @@ namespace Microsoft.DotNet.Cli
             }
 
             public override string ToString() => _value;  
+            
+            public static explicit operator string(ForwardedArgument argument)
+            {
+                return argument.ToString();
+            }
         }
     }
 }

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

@@ -19,9 +19,9 @@ namespace Microsoft.DotNet.Cli
                     {
                         return new RunCommand()
                         {
-                        Configuration = o.ValueOrDefault<string>("--configuration"),
+                            Configuration = o.SingleArgumentOrDefault("--configuration"),
-                        Framework = o.ValueOrDefault<string>("--framework"),
+                            Framework = o.SingleArgumentOrDefault("--framework"),
-                        Project = o.ValueOrDefault<string>("--project"),
+                            Project = o.SingleArgumentOrDefault("--project"),
                             Args = (IReadOnlyList<string>)o.Arguments
                         };
                     }),