C#字符串操作 取文本左边 取文本右边 取文本中间 取文本中间到List集合 指定文本倒序

/// <summary>
/// 取文本左边内容
/// </summary>
/// <param name="str">文本</param>
/// <param name="s">标识符</param>
/// <returns>左边内容</returns>
public static string GetLeft(string str, string s)
{
string temp = str.Substring(0, str.IndexOf(s));
return temp;
}

/// <summary>
/// 取文本右边内容
/// </summary>
/// <param name="str">文本</param>
/// <param name="s">标识符</param>
/// <returns>右边内容</returns>
public static string GetRight(string str, string s)
{
string temp = str.Substring(str.IndexOf(s), str.Length-str.Substring(0, str.IndexOf(s)).Length);
return temp;
}

/// <summary>
/// 取文本中间内容
/// </summary>
/// <param name="str">原文本</param>
/// <param name="leftstr">左边文本</param>
/// <param name="rightstr">右边文本</param>
/// <returns>返回中间文本内容</returns>
public static string Between(string str, string leftstr, string rightstr)
{
int i = str.IndexOf(leftstr) + leftstr.Length;
string temp = str.Substring(i, str.IndexOf(rightstr, i) - i);
return temp;
}

/// <summary>
/// 取文本中间到List集合
/// </summary>
/// <param name="str">文本字符串</param>
/// <param name="leftstr">左边文本</param>
/// <param name="rightstr">右边文本</param>
/// <returns>List集合</returns>
public List<string> BetweenArr(string str, string leftstr, string rightstr)
{
List<string> list = new List<string>();
int leftIndex = str.IndexOf(leftstr);//左文本起始位置
int leftlength = leftstr.Length;//左文本长度
int rightIndex = 0;
string temp = "";
while (leftIndex != -1)
{
rightIndex = str.IndexOf(rightstr, leftIndex + leftlength);
if (rightIndex == -1)
{
break;
}
temp = str.Substring(leftIndex + leftlength, rightIndex - leftIndex - leftlength);
list.Add(temp);
leftIndex = str.IndexOf(leftstr, rightIndex + 1);
}
return list;
}

/// <summary>
/// 指定文本倒序
/// </summary>
/// <param name="str">文本</param>
/// <returns>倒序文本</returns>
public static string StrReverse(string str)
{
char[] chars = str.ToCharArray();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < chars.Length; i++)
{
sb.Append(chars[chars.Length - 1 - i]);
}
return sb.ToString();
}