porting 7.6-rc1 into 8

src/Umbraco.Core/Serialization/StreamResultExtensions.cs

@@ -0,0 +1,22 @@
+using System.IO;
+using System.Text;
+using System.Xml.Linq;
+
+namespace Umbraco.Core.Serialization
+{
+    public static class StreamResultExtensions
+    {
+        public static string ToJsonString(this Stream stream)
+        {
+            byte[] bytes = new byte[stream.Length];
+            stream.Position = 0;
+            stream.Read(bytes, 0, (int)stream.Length);
+            return Encoding.UTF8.GetString(bytes);
+        }
+
+        public static XDocument ToXDoc(this Stream stream)
+        {
+            return XDocument.Load(stream);
+        }
+    }
+}