C# String的一些简单操作记录

/// <summary>
/// 替换字符串，仅第一个匹配项
/// </summary>
/// <param name="value">原始内容</param>
/// <param name="oldValue">要替换的字符串</param>
/// <param name="newValue">替换后的字符串</param>
/// <returns></returns>
private static string GetReplaceByFirst(string value, string oldValue, string newValue, StringComparison comparisonType = StringComparison.CurrentCulture)
{
int index = value.IndexOf(oldValue, comparisonType);
if (index > -1)
{
value = value.Remove(index, oldValue.Length).Insert(index, newValue);
}
return value;
}

/// <summary>
/// 替换字符串，除第一个匹配项
/// </summary>
/// <param name="value">原始内容</param>
/// <param name="oldValue">要替换的字符串</param>
/// <param name="newValue">替换后的字符串</param>
/// <returns></returns>
private static string GetReplaceByNotFirst(string value, string oldValue, string newValue, StringComparison comparisonType = StringComparison.CurrentCulture)
{
int index = value.IndexOf(oldValue, comparisonType);
if (index > -1)
{
value = value.Substring(0, index + 1) + (value.Substring(index + 1).Replace(oldValue, newValue));
}
return value;
}