組合StringComparison枚舉

Question

我正要寫一個方法，它必須決定在比較兩個字符串時是否忽略大小寫。

public bool IsCaseSensitiveUsing(StringComparison comparer) 
{ 
    if (comparer == StringComparison.CurrentCulture | 
     comparer == StringComparison.InvariantCulture | 
     comparer == StringComparison.Ordinal)) 
      return true; 

    return false; 

} 

有沒有更好的方法來做到這一點？

Answer 1

我建議implementng 擴展方法：

public static class StringComparisonExtensions { 
    public static bool IsCaseSensitiveUsing(this StringComparison value) { 
     return (value == StringComparison.CurrentCulture || 
       value == StringComparison.InvariantCulture || 
       value == StringComparison.Ordinal); 
    } 
    } 

    .... 

    StringComparison myComparison = ... 

    // Check as if StringComparison has IsCaseSensitiveUsing method: 
    if (myComparison.IsCaseSensitiveUsing()) { 
    ... 
    } 

Answer 2

你可以讓一組需要區分大小寫StringComparison值，並在你的方法使用它：

private static readonly ISet<StringComparison> caseSensitive = new HashSet<StringComparison> { 
    StringComparison.CurrentCulture 
, StringComparison.InvariantCulture 
, StringComparison.Ordinal 
}; 
public static bool IsCaseSensitiveUsing(StringComparison comparer) { 
    return caseSensitive.Contains(comparer); 
}