一些方便的字符串助手:
用法:
我讨厌不需要的空格尾随或引导字符串，因为字符串可以采取空值，这可能是棘手的，所以我使用这个:
public bool IsGroup { get { return !this.GroupName.IsNullOrTrimEmpty(); } }
这是另一个扩展方法，我使用一个新的验证框架，我正在试验。你可以看到regex扩展，帮助清理凌乱的regex:
public static bool IsRequiredWithLengthLessThanOrEqualNoSpecial(this String str, int length)
{
return !str.IsNullOrTrimEmpty() &&
str.RegexMatch(
@"^[- \r\n\\\.!:*,@$%&""?\(\)\w']{1,{0}}$".RegexReplace(@"\{0\}", length.ToString()),
RegexOptions.Multiline) == str;
}
来源:
public static class StringHelpers
{
/// <summary>
/// Same as String.IsNullOrEmpty except that
/// it captures the Empty state for whitespace
/// strings by Trimming first.
/// </summary>
public static bool IsNullOrTrimEmpty(this String helper)
{
if (helper == null)
return true;
else
return String.Empty == helper.Trim();
}
public static int TrimLength(this String helper)
{
return helper.Trim().Length;
}
/// <summary>
/// Returns the matched string from the regex pattern. The
/// groupName is for named group match values in the form (?<name>group).
/// </summary>
public static string RegexMatch(this String helper, string pattern, RegexOptions options, string groupName)
{
if (groupName.IsNullOrTrimEmpty())
return Regex.Match(helper, pattern, options).Value;
else
return Regex.Match(helper, pattern, options).Groups[groupName].Value;
}
public static string RegexMatch(this String helper, string pattern)
{
return RegexMatch(helper, pattern, RegexOptions.None, null);
}
public static string RegexMatch(this String helper, string pattern, RegexOptions options)
{
return RegexMatch(helper, pattern, options, null);
}
public static string RegexMatch(this String helper, string pattern, string groupName)
{
return RegexMatch(helper, pattern, RegexOptions.None, groupName);
}
/// <summary>
/// Returns true if there is a match from the regex pattern
/// </summary>
public static bool IsRegexMatch(this String helper, string pattern, RegexOptions options)
{
return helper.RegexMatch(pattern, options).Length > 0;
}
public static bool IsRegexMatch(this String helper, string pattern)
{
return helper.IsRegexMatch(pattern, RegexOptions.None);
}
/// <summary>
/// Returns a string where matching patterns are replaced by the replacement string.
/// </summary>
/// <param name="pattern">The regex pattern for matching the items to be replaced</param>
/// <param name="replacement">The string to replace matching items</param>
/// <returns></returns>
public static string RegexReplace(this String helper, string pattern, string replacement, RegexOptions options)
{
return Regex.Replace(helper, pattern, replacement, options);
}
public static string RegexReplace(this String helper, string pattern, string replacement)
{
return Regex.Replace(helper, pattern, replacement, RegexOptions.None);
}
}
我喜欢做很多正则表达式，所以我认为这些比添加using语句和额外的代码来处理命名组更容易。
