c#常用function

1.创建随机字符串

string nonceStr = createNonceStr(); 
private string createNonceStr()
    {
        int length = 16;
        string chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        string str = "";
        Random rad = new Random();
        for (int i = 0; i < length; i++)
        {
            str += chars.Substring(rad.Next(0, chars.Length - 1), 1);
        }
        return str;
    }

 

2.SHA1哈希加密算法 

string signature = SHA1_Hash(rawstring); 
 public string SHA1_Hash(string str_sha1_in)
    {
        SHA1 sha1 = new SHA1CryptoServiceProvider();
        byte[] bytes_sha1_in = System.Text.UTF8Encoding.Default.GetBytes(str_sha1_in);
        byte[] bytes_sha1_out = sha1.ComputeHash(bytes_sha1_in);
        string str_sha1_out = BitConverter.ToString(bytes_sha1_out);
        str_sha1_out = str_sha1_out.Replace("-", "").ToLower();
        return str_sha1_out;
    }

 

3.将c# DateTime时间格式转换为Unix时间戳格式

 

string timestamp = Convert.ToString(ConvertDateTimeInt(DateTime.Now));
/// <summary>  
    /// 将c# DateTime时间格式转换为Unix时间戳格式  
    /// </summary>  
    /// <param name="time">时间</param>  
    /// <returns>double</returns>  
    public int ConvertDateTimeInt(System.DateTime time)
    {
        int intResult = 0;
        System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
        intResult = Convert.ToInt32((time - startTime).TotalSeconds);
        return intResult;
    }