1 files changed, 61 insertions, 0 deletions
diff --git a/src/Mvc/src/Microsoft.AspNetCore.Mvc.Core/Formatters/StringOutputFormatter.cs b/src/Mvc/src/Microsoft.AspNetCore.Mvc.Core/Formatters/StringOutputFormatter.cs
new file mode 100644
index 0000000000..52c387d137
--- /dev/null
+++ b/src/Mvc/src/Microsoft.AspNetCore.Mvc.Core/Formatters/StringOutputFormatter.cs
@@ -0,0 +1,61 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Http;
+
+namespace Microsoft.AspNetCore.Mvc.Formatters
+{
+    /// <summary>
+    /// A <see cref="TextOutputFormatter"/> for simple text content.
+    /// </summary>
+    public class StringOutputFormatter : TextOutputFormatter
+    {
+        public StringOutputFormatter()
+        {
+            SupportedEncodings.Add(Encoding.UTF8);
+            SupportedEncodings.Add(Encoding.Unicode);
+            SupportedMediaTypes.Add("text/plain");
+        }
+
+        public override bool CanWriteResult(OutputFormatterCanWriteContext context)
+        {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            if (context.ObjectType == typeof(string) || context.Object is string)
+            {
+                // Call into base to check if the current request's content type is a supported media type.
+                return base.CanWriteResult(context);
+            }
+
+            return false;
+        }
+
+        public override Task WriteResponseBodyAsync(OutputFormatterWriteContext context, Encoding encoding)
+        {
+            if (context == null)
+            {
+                throw new ArgumentNullException(nameof(context));
+            }
+
+            if (encoding == null)
+            {
+                throw new ArgumentNullException(nameof(encoding));
+            }
+
+            var valueAsString = (string)context.Object;
+            if (string.IsNullOrEmpty(valueAsString))
+            {
+                return Task.CompletedTask;
+            }
+
+            var response = context.HttpContext.Response;
+            return response.WriteAsync(valueAsString, encoding);
+        }
+    }
+}