Use string.Equals over string.Compare for improved performance (#9724)

src/Microsoft.DotNet.Wpf/src/WindowsBase/MS/Internal/ContentType.cs

@@ -258,8 +258,8 @@ namespace MS.Internal
                 // safe comparison because the _type and _subType strings have been restricted to
                 // ASCII characters, digits, and a small set of symbols.  This is not a safe comparison
                 // for the broader set of strings that have not been restricted in the same way.
-                result = (String.Compare(_type, contentType.TypeComponent, StringComparison.OrdinalIgnoreCase) == 0 &&
-                          String.Compare(_subType, contentType.SubTypeComponent, StringComparison.OrdinalIgnoreCase) == 0);
+                result = string.Equals(_type, contentType.TypeComponent, StringComparison.OrdinalIgnoreCase) &&
+                         string.Equals(_subType, contentType.SubTypeComponent, StringComparison.OrdinalIgnoreCase);
             }           
             return result;
         }