replace v6 with experimental v7 code

src/MpvNet/ExtensionMethod/ObjectExtension.cs

@@ -0,0 +1,7 @@
+
+namespace MpvNet.ExtensionMethod;
+
+public static class ObjectExtension
+{
+    public static string ToStringEx(this object instance) => instance?.ToString() ?? "";
+}

src/MpvNet/ExtensionMethod/PathStringExtension.cs

@@ -0,0 +1,67 @@
+
+namespace MpvNet.ExtensionMethod;
+
+public static class PathStringExtension
+{
+    public static string Ext(this string filepath) => filepath.Ext(false);
+
+    public static string Ext(this string filepath, bool includeDot)
+    {
+        if (string.IsNullOrEmpty(filepath))
+            return "";
+
+        char[] chars = filepath.ToCharArray();
+
+        for (int x = filepath.Length - 1; x >= 0; x--)
+        {
+            if (chars[x] == Path.DirectorySeparatorChar)
+                return "";
+
+            if (chars[x] == '.')
+                return filepath.Substring(x + (includeDot ? 0 : 1)).ToLowerInvariant();
+        }
+
+        return "";
+    }
+
+    public static string FileName(this string instance)
+    {
+        if (string.IsNullOrEmpty(instance))
+            return "";
+
+        int index = instance.LastIndexOf('\\');
+
+        if (index > -1)
+            return instance.Substring(index + 1);
+
+        index = instance.LastIndexOf('/');
+
+        if (index > -1)
+            return instance.Substring(index + 1);
+
+        return instance;
+    }
+
+    public static string ShortPath(this string instance, int maxLength)
+    {
+        if (string.IsNullOrEmpty(instance))
+            return "";
+
+        if (instance.Length > maxLength && instance.Substring(1, 2) == ":\\")
+            instance = instance[..3] + "...\\" + instance.FileName();
+
+        return instance;
+    }
+
+    // Ensure trailing directory separator char
+    public static string AddSep(this string instance)
+    {
+        if (string.IsNullOrEmpty(instance))
+            return "";
+
+        if (!instance.EndsWith(Path.DirectorySeparatorChar.ToString()))
+            instance = instance + Path.DirectorySeparatorChar;
+
+        return instance;
+    }
+}

src/MpvNet/ExtensionMethod/StringExtension.cs

@@ -0,0 +1,30 @@
+
+using System.Globalization;
+
+namespace MpvNet.ExtensionMethod;
+
+public static class StringExtension
+{
+    public static string ToUpperEx(this string instance) => (instance != null) ? instance.ToUpperInvariant() : "";
+
+    public static string ToLowerEx(this string instance) => (instance != null) ? instance.ToLowerInvariant() : "";
+
+    public static string TrimEx(this string? instance) => (instance == null) ? "" : instance.Trim();
+
+    public static int ToInt(this string instance, int defaultValue = 0)
+    {
+        if (int.TryParse(instance, out int result))
+            return result;
+
+        return defaultValue;
+    }
+
+    public static float ToFloat(this string instance) =>
+        float.Parse(instance.Replace(",", "."), NumberStyles.Float, CultureInfo.InvariantCulture);
+
+    public static bool ContainsEx(this string? instance, string? value) =>
+        !string.IsNullOrEmpty(instance) && !string.IsNullOrEmpty(value) && instance.Contains(value);
+
+    public static bool StartsWithEx(this string? instance, string? value) =>
+        (instance != null && value != null) && instance.StartsWith(value);
+}