make dlna project portable

Emby.Dlna/Didl/StringWriterWithEncoding.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Emby.Dlna.Didl
+{
+    public class StringWriterWithEncoding : StringWriter
+    {
+        private readonly Encoding _encoding;
+
+        public StringWriterWithEncoding()
+        {
+        }
+
+        public StringWriterWithEncoding(IFormatProvider formatProvider)
+            : base(formatProvider)
+        {
+        }
+
+        public StringWriterWithEncoding(StringBuilder sb)
+            : base(sb)
+        {
+        }
+
+        public StringWriterWithEncoding(StringBuilder sb, IFormatProvider formatProvider)
+            : base(sb, formatProvider)
+        {
+        }
+
+
+        public StringWriterWithEncoding(Encoding encoding)
+        {
+            _encoding = encoding;
+        }
+
+        public StringWriterWithEncoding(IFormatProvider formatProvider, Encoding encoding)
+            : base(formatProvider)
+        {
+            _encoding = encoding;
+        }
+
+        public StringWriterWithEncoding(StringBuilder sb, Encoding encoding)
+            : base(sb)
+        {
+            _encoding = encoding;
+        }
+
+        public StringWriterWithEncoding(StringBuilder sb, IFormatProvider formatProvider, Encoding encoding)
+            : base(sb, formatProvider)
+        {
+            _encoding = encoding;
+        }
+
+        public override Encoding Encoding
+        {
+            get { return (null == _encoding) ? base.Encoding : _encoding; }
+        }
+    }
+}