Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Activities/System/Activities/Statements/WriteLine.cs

@@ -0,0 +1,64 @@
+//----------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//----------------------------------------------------------------
+
+namespace System.Activities.Statements
+{
+    using System;
+    using System.ComponentModel;
+    using System.IO;
+    using System.Runtime;
+    using System.Activities.Validation;
+    using System.Collections.Generic;
+    using System.Windows.Markup;
+    using System.Collections.ObjectModel;
+
+    [ContentProperty("Text")]
+    public sealed class WriteLine : CodeActivity
+    {
+        public WriteLine()
+        {
+        }
+
+        [DefaultValue(null)]
+        public InArgument<TextWriter> TextWriter 
+        {
+            get;
+            set;
+        }
+
+        [DefaultValue(null)]
+        public InArgument<string> Text 
+        {
+            get;
+            set;
+        }
+
+        protected override void CacheMetadata(CodeActivityMetadata metadata)
+        {
+            RuntimeArgument textArgument = new RuntimeArgument("Text", typeof(string), ArgumentDirection.In);
+            metadata.Bind(this.Text, textArgument);
+
+            RuntimeArgument textWriterArgument = new RuntimeArgument("TextWriter", typeof(TextWriter), ArgumentDirection.In);
+            metadata.Bind(this.TextWriter, textWriterArgument);
+
+            metadata.SetArgumentsCollection(
+                new Collection<RuntimeArgument>
+                {
+                    textArgument,
+                    textWriterArgument
+                });
+        }
+
+        protected override void Execute(CodeActivityContext context)
+        {
+            TextWriter writer = this.TextWriter.Get(context);
+            if (writer == null)
+            {
+                writer = context.GetExtension<TextWriter>() ?? Console.Out;
+            }
+            Fx.Assert(writer != null, "Writer should fallback to Console.Out and never be null");
+            writer.WriteLine(this.Text.Get(context));
+        }
+    }
+}