Fix build and more Append calls

Emby.Dlna/PlayTo/Device.cs

@@ -4,12 +4,12 @@ using System;
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
+using System.Security;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Xml;
 using System.Xml.Linq;
 using Emby.Dlna.Common;
-using Emby.Dlna.Server;
 using Emby.Dlna.Ssdp;
 using MediaBrowser.Common.Net;
 using MediaBrowser.Controller.Configuration;
@@ -334,7 +334,7 @@ namespace Emby.Dlna.PlayTo
                 return string.Empty;
             }
 
-            return DescriptionXmlBuilder.Escape(value);
+            return SecurityElement.Escape(value);
         }
 
         private Task SetPlay(TransportCommands avCommands, CancellationToken cancellationToken)

Emby.Dlna/Server/DescriptionXmlBuilder.cs

@@ -65,7 +65,7 @@ namespace Emby.Dlna.Server
 
             foreach (var att in attributes)
             {
-                builder.AppendFormat(" {0}=\"{1}\"", att.Name, att.Value);
+                builder.AppendFormat(CultureInfo.InvariantCulture, " {0}=\"{1}\"", att.Name, att.Value);
             }
 
             builder.Append('>');

Emby.Dlna/Service/ServiceXmlBuilder.cs

@@ -1,9 +1,9 @@
 #pragma warning disable CS1591
 
 using System.Collections.Generic;
+using System.Security;
 using System.Text;
 using Emby.Dlna.Common;
-using Emby.Dlna.Server;
 
 namespace Emby.Dlna.Service
 {
@@ -37,7 +37,9 @@ namespace Emby.Dlna.Service
             {
                 builder.Append("<action>");
 
-                builder.Append("<name>" + DescriptionXmlBuilder.Escape(item.Name ?? string.Empty) + "</name>");
+                builder.Append("<name>")
+                    .Append(SecurityElement.Escape(item.Name ?? string.Empty))
+                    .Append("</name>");
 
                 builder.Append("<argumentList>");
 
@@ -45,9 +47,15 @@ namespace Emby.Dlna.Service
                 {
                     builder.Append("<argument>");
 
-                    builder.Append("<name>" + DescriptionXmlBuilder.Escape(argument.Name ?? string.Empty) + "</name>");
+                    builder.Append("<name>")
-                    builder.Append("<direction>" + DescriptionXmlBuilder.Escape(argument.Direction ?? string.Empty) + "</direction>");
+                        .Append(SecurityElement.Escape(argument.Name ?? string.Empty))
-                    builder.Append("<relatedStateVariable>" + DescriptionXmlBuilder.Escape(argument.RelatedStateVariable ?? string.Empty) + "</relatedStateVariable>");
+                        .Append("</name>");
+                    builder.Append("<direction>")
+                        .Append(SecurityElement.Escape(argument.Direction ?? string.Empty))
+                        .Append("</direction>");
+                    builder.Append("<relatedStateVariable>")
+                        .Append(SecurityElement.Escape(argument.RelatedStateVariable ?? string.Empty))
+                        .Append("</relatedStateVariable>");
 
                     builder.Append("</argument>");
                 }
@@ -68,17 +76,25 @@ namespace Emby.Dlna.Service
             {
                 var sendEvents = item.SendsEvents ? "yes" : "no";
 
-                builder.Append("<stateVariable sendEvents=\"" + sendEvents + "\">");
+                builder.Append("<stateVariable sendEvents=\"")
+                    .Append(sendEvents)
+                    .Append("\">");
 
-                builder.Append("<name>" + DescriptionXmlBuilder.Escape(item.Name ?? string.Empty) + "</name>");
+                builder.Append("<name>")
-                builder.Append("<dataType>" + DescriptionXmlBuilder.Escape(item.DataType ?? string.Empty) + "</dataType>");
+                    .Append(SecurityElement.Escape(item.Name ?? string.Empty))
+                    .Append("</name>");
+                builder.Append("<dataType>")
+                    .Append(SecurityElement.Escape(item.DataType ?? string.Empty))
+                    .Append("</dataType>");
 
                 if (item.AllowedValues.Length > 0)
                 {
                     builder.Append("<allowedValueList>");
                     foreach (var allowedValue in item.AllowedValues)
                     {
-                        builder.Append("<allowedValue>" + DescriptionXmlBuilder.Escape(allowedValue) + "</allowedValue>");
+                        builder.Append("<allowedValue>")
+                            .Append(SecurityElement.Escape(allowedValue))
+                            .Append("</allowedValue>");
                     }
 
                     builder.Append("</allowedValueList>");