c# - 到底什么是 String.LegacyMode 属性？

Question

当我反编译时String.IndexOf (String)方法，我看到了；

[__DynamicallyInvokable]
public int IndexOf(string value)
{
  return this.IndexOf(value, string.LegacyMode ? StringComparison.Ordinal : StringComparison.CurrentCulture);
}

第二个参数定义中:

• 如果 string.LegacyMode 为 true，则评估 StringComparison.Ordinal。
• 如果 string.LegacyMode 为 false，则评估 StringComparison.CurrentCulture。

但是 String.LegacyMode 到底是什么意思呢？

当我反编译这个属性时，我看到了这个:

internal static bool LegacyMode
{
  get
  {
    return CompatibilitySwitches.IsAppEarlierThanSilverlight4;
  }
}

我搜索了 String.LegacyMode和 CompatibilitySwitches.IsAppEarlierThanSilverlight4首先在 Google 上，但我找不到任何有用的信息。

你能教教我吗？

Answer 1

为什么不检查源代码，MSDN :)

Ninja 编辑:我刚刚看到您在问题顶部发布的链接。从其他版本下拉列表中选择 Silverlight，您将看到下面的注释。

String.IndexOf Method

Notes to Callers

Starting in Silverlight 4, the behavior of the String.IndexOf(String) method has changed. In Silverlight 4, it performs a case-sensitive and culture-sensitive comparison using the current culture to find the first occurrence of value. This conforms to the behavior of the String.IndexOf(String) method in the full .NET Framework. In Silverlight 2 and Silverlight 3, String.IndexOf(String) performs an ordinal comparison. If the common language runtime determines that a Silverlight-based application was compiled using either Silverlight 2 or Silverlight 3, it performs an ordinal comparison; otherwise, it performs a culture-sensitive comparison.