为什么字符串“\ u0022”以此字符串“\ u204D”开头

1 回答

• 0

  要知道依赖于文化的字符串比较有哪些规则并不容易 . 在文化比较（包括不变文化的那些）下，标点符号U 0022 " （QUOTATION MARK）和U 204D ⁍ （BLACK RIGHTWARDS BULLET）被认为是非常一致的 . 这些例子都表明：

  // culture-sensitive:
  
  Console.WriteLine("\"".StartsWith("⁍"));
  Console.WriteLine("⁍".StartsWith("\""));
  Console.WriteLine("\"".StartsWith("⁍", StringComparison.InvariantCulture));
  Console.WriteLine("⁍".StartsWith("\"", StringComparison.InvariantCulture));
  
  Console.WriteLine("\"".Equals("⁍", StringComparison.CurrentCulture));
  Console.WriteLine("⁍".Equals("\"", StringComparison.CurrentCulture));
  Console.WriteLine("\"".Equals("⁍", StringComparison.InvariantCulture));
  Console.WriteLine("⁍".Equals("\"", StringComparison.InvariantCulture));
  
  Console.WriteLine(StringComparer.CurrentCulture.Equals("\"", "⁍"));
  Console.WriteLine(StringComparer.CurrentCulture.Equals("⁍", "\""));
  Console.WriteLine(StringComparer.InvariantCulture.Equals("\"", "⁍"));
  Console.WriteLine(StringComparer.InvariantCulture.Equals("⁍", "\""));
  
  Console.WriteLine("\"".CompareTo("⁍"));
  Console.WriteLine("⁍".CompareTo("\""));
  
  Console.WriteLine(StringComparer.CurrentCulture.Compare("\"", "⁍"));
  Console.WriteLine(StringComparer.CurrentCulture.Compare("⁍", "\""));
  Console.WriteLine(StringComparer.InvariantCulture.Compare("\"", "⁍"));
  Console.WriteLine(StringComparer.InvariantCulture.Compare("⁍", "\""));
  

  可以给出其他示例，例如 string 上的 static 方法，但它们是等效的 .

  通过序数比较，肯定U 0022必须与（小于）U 204D不同（这很简单！）：

  // ordinal:
  
  Console.WriteLine("\"".StartsWith("⁍", StringComparison.Ordinal));
  Console.WriteLine("⁍".StartsWith("\"", StringComparison.Ordinal));
  
  Console.WriteLine("\"".Equals("⁍"));
  Console.WriteLine("⁍".Equals("\""));
  
  Console.WriteLine(StringComparer.Ordinal.Equals("\"", "⁍"));
  Console.WriteLine(StringComparer.Ordinal.Equals("⁍", "\""));
  
  Console.WriteLine(StringComparer.Ordinal.Compare("\"", "⁍"));
  Console.WriteLine(StringComparer.Ordinal.Compare("⁍", "\""));
  

  回复于 2024-05-06T19:47:40+08:00