/// <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;
}