Added playlist repository logic.

Harmonia.Core/Data/XMLFileRepository.cs

@@ -0,0 +1,26 @@
+using System.Xml.Serialization;
+
+namespace Harmonia.Core.Data;
+
+public abstract class XMLFileRepository<TObject> : FileRepository<TObject> where TObject : notnull, new()
+{
+    private readonly XmlSerializer _serializer = new(typeof(TObject));
+
+    protected override string Extension => "xml";
+
+    protected override TObject Deserialize(Stream stream)
+    {
+        using TextReader textReader = new StreamReader(stream);
+
+        return (TObject?)_serializer.Deserialize(textReader) ?? new();
+    }
+
+    protected override string Serialize(TObject obj)
+    {
+        using TextWriter textWriter = new StringWriter();
+
+        _serializer.Serialize(textWriter, obj);
+
+        return textWriter.ToString() ?? string.Empty;
+    }
+}