perf: Micro optimization EndsWith using

src/Avalonia.Base/Animation/Cue.cs

@@ -34,7 +34,7 @@ public static Cue Parse(string value, CultureInfo? culture)
         {
             string v = value;
 
-            if (value.EndsWith("%"))
+            if (value.Length > 0 && value[value.Length -1 ] == '%')
             {
                 v = v.TrimEnd('%');
             }

src/Avalonia.Base/Media/Fonts/FontFamilyLoader.cs

@@ -94,14 +94,14 @@ private static bool IsContainsFile(Uri x, string filePattern, string fileExtensi
         {
             var path = x.GetUnescapeAbsolutePath();
             return path.IndexOf(filePattern, StringComparison.Ordinal) >= 0
-                   && path.EndsWith(fileExtension, StringComparison.Ordinal);
+                   && path.EndsWith(fileExtension, StringComparison.OrdinalIgnoreCase);
         }
 
         private static bool IsFontTtfOrOtf(Uri uri)
         {
             var sourceWithoutArguments = GetSubString(uri.OriginalString, '?');
-            return sourceWithoutArguments.EndsWith(".ttf", StringComparison.Ordinal)
-                   || sourceWithoutArguments.EndsWith(".otf", StringComparison.Ordinal);
+            return sourceWithoutArguments.EndsWith(".ttf", StringComparison.OrdinalIgnoreCase)
+                   || sourceWithoutArguments.EndsWith(".otf", StringComparison.OrdinalIgnoreCase);
         }
 
         private static (string fileNameWithoutExtension, string extension) GetFileNameAndExtension(

src/Avalonia.Base/RelativePoint.cs

@@ -164,9 +164,9 @@ public static RelativePoint Parse(string s)
                 var unit = RelativeUnit.Absolute;
                 var scale = 1.0;
 
-                if (x.EndsWith("%"))
+                if (x.Length > 0 && x[x.Length - 1] == '%')
                 {
-                    if (!y.EndsWith("%"))
+                    if (!(y.Length > 0 && y[y.Length - 1] == '%'))
                     {
                         throw new FormatException("If one coordinate is relative, both must be.");
                     }

src/Avalonia.Build.Tasks/GenerateAvaloniaResourcesTask.cs

@@ -88,7 +88,10 @@ private bool PreProcessXamlFiles(List<Source> sources)
 
             foreach (var s in sources.ToArray())
             {
-                if (s.Path.ToLowerInvariant().EndsWith(".xaml") || s.Path.ToLowerInvariant().EndsWith(".paml") || s.Path.ToLowerInvariant().EndsWith(".axaml"))
+                var path = s.Path;
+                if (path.EndsWith(".axaml", StringComparison.OrdinalIgnoreCase) 
+                    || path.EndsWith(".xaml", StringComparison.OrdinalIgnoreCase) 
+                    || path.EndsWith(".paml", StringComparison.OrdinalIgnoreCase) )
                 {
                     XamlFileInfo info;
                     try
@@ -110,7 +113,7 @@ private bool PreProcessXamlFiles(List<Source> sources)
                                 $"Duplicate x:Class directive, {info.XClass} is already used in {typeToXamlIndex[info.XClass]}");
                             return false;
                         }
-                        typeToXamlIndex[info.XClass] = s.Path;
+                        typeToXamlIndex[info.XClass] = path;
                     }
                 }
             }

src/Avalonia.Build.Tasks/XamlCompilerTaskExecutor.cs

@@ -23,11 +23,15 @@ namespace Avalonia.Build.Tasks
     public static partial class XamlCompilerTaskExecutor
     {
         private const string CompiledAvaloniaXamlNamespace = "CompiledAvaloniaXaml";
-
-        static bool CheckXamlName(IResource r) => r.Name.ToLowerInvariant().EndsWith(".xaml")
-                                               || r.Name.ToLowerInvariant().EndsWith(".paml")
-                                               || r.Name.ToLowerInvariant().EndsWith(".axaml");
-
+
+        static bool CheckXamlName(IResource r)
+        {
+            var name = r.Name;
+            return name.EndsWith(".axaml", StringComparison.OrdinalIgnoreCase)
+                || name.EndsWith(".xaml",StringComparison.OrdinalIgnoreCase)
+                || name.EndsWith(".paml", StringComparison.OrdinalIgnoreCase);
+        }
+
         public class CompileResult
         {
             public bool Success { get; set; }

src/tools/Avalonia.Generators/NameGenerator/AvaloniaNameGenerator.cs

@@ -36,10 +36,11 @@ public IEnumerable<GeneratedPartialClass> GenerateNameReferences(IEnumerable<Add
     {
         var resolveViews =
             from file in additionalFiles
-            where (file.Path.EndsWith(".xaml") ||
-                   file.Path.EndsWith(".paml") ||
-                   file.Path.EndsWith(".axaml")) &&
-                  _pathPattern.Matches(file.Path)
+            let filePath = file.Path
+            where (filePath.EndsWith(".xaml", StringComparison.OrdinalIgnoreCase) ||
+                   filePath.EndsWith(".paml", StringComparison.OrdinalIgnoreCase) ||
+                   filePath.EndsWith(".axaml", StringComparison.OrdinalIgnoreCase)) &&
+                  _pathPattern.Matches(filePath)
             let xaml = file.GetText(cancellationToken)?.ToString()
             where xaml != null
             let view = _classes.ResolveView(xaml)

src/tools/DevGenerators/CompositionGenerator/CompositionRoslynGenerator.cs

@@ -10,7 +10,7 @@ public class CompositionRoslynGenerator : IIncrementalGenerator
         public void Initialize(IncrementalGeneratorInitializationContext context)
         {
             var schema =
-                context.AdditionalTextsProvider.Where(static file => file.Path.EndsWith("composition-schema.xml"));
+                context.AdditionalTextsProvider.Where(static file => file.Path.EndsWith("composition-schema.xml", System.StringComparison.OrdinalIgnoreCase));
             var configs = schema.Select((t, _) => t.GetText())
                 .Where(source => source is not null)
                 .Select((source, _) => (GConfig)new XmlSerializer(typeof(GConfig)).Deserialize(new StringReader(source!.ToString())));