常用–字符串操作类（整理与归纳）
1、判断对象是否为空，为空返回true
2、把字符串按分隔符拆成List
3、把List按分隔符合成字符串
4、DelChar 以指定字符去尾或去头
5、IsMatch 快速验证一个字符串是否符合指定的正则表达式
6、ISNumber 验证字符串是否纯数字
7、MD5 对字符串进行MD5加密
8、DES 加密
9、DES 解密
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
namespace MyTools
{
/// <summary>
/// 字符串操作类
/// 1、判断对象是否为空，为空返回true
/// 2、把字符串按分隔符拆成List
/// 3、把List按分隔符合成字符串
/// 4、DelChar 以指定字符去尾或去头
/// 5、IsMatch 快速验证一个字符串是否符合指定的正则表达式
/// 6、ISNumber 验证字符串是否纯数字
/// 7、MD5 对字符串进行MD5加密
/// 8、DES 加密
/// 9、DES 解密
/// </summary>
public class StringHelp
{
#region 1、判断对象是否为空
/// <summary>
/// 判断对象是否为空，为空返回true
/// </summary>
/// <param name="data">要验证的对象</param>
public static bool IsNullOrEmpty(object data)
{ //如果为null
if (data == null) return true;
//如果为""
if (data.GetType() == typeof(String))
{
if (string.IsNullOrEmpty(data.ToString().Trim()))
{
return true;
}
}
//如果为DBNull
if (data.GetType() == typeof(DBNull)) return true;
return false;
}
#endregion
#region 2、把字符串按分隔符转换成List
/// <summary>
/// 把字符串按分隔符拆成List
/// </summary>
/// <param name="str">源字符串</param>
/// <param name="speater">分隔符</param>
/// <param name="toLower">是否转换为小写</param>
/// <param name="toUnique">是否去重复</param>
public static List<string> StrToList(string str, char speater, bool toLower = false, bool toUnique = false)
{
List<string> list = new List<string>();
string[] ss = str.Split(speater);
foreach (string s in ss)
{
if (!string.IsNullOrEmpty(s) && s != speater.ToString())
{
string strVal = s;
if (toLower)
{
strVal = s.ToLower();
}
if (toUnique)
{
if (!list.Contains(strVal)) list.Add(strVal);
}
else
{
list.Add(strVal);
}
}
}
return list;
}
#endregion
#region 3、把数组按分隔符拼成字符串
/// <summary>
/// 把List按分隔符合成字符串
/// </summary>
/// <param name="list">源数组</param>
/// <param name="speater">分隔符</param>
public static string ListToStr(List<string> list, char speater = ',')
{
StringBuilder sb = new StringBuilder();
int i = 1;
foreach (string ss in list)
{
sb.Append(ss);
if (i < list.Count) sb.Append(speater);//最后不需要添加
i++;
}
return sb.ToString();
}
#endregion
#region 4、以指定字符去尾或去头
/// <summary>
/// 以指定字符去尾或去头
/// </summary>
/// <param name="str">源字符</param>
/// <param name="strchar">指定字符</param>
/// <param name="FirstOrLast">true,去尾;false,去头</param>
public static string DelChar(string str, string strchar, bool FirstOrLast = true)
{
if (FirstOrLast)
{
return str.Substring(0, str.LastIndexOf(strchar));
}
else
{
return str.Substring(str.IndexOf(strchar) + 1);
}
}
#endregion
#region 5、快速验证一个字符串是否符合指定的正则表达式
/// <summary>
/// 快速验证一个字符串是否符合指定的正则表达式
/// </summary>
/// <param name="pattern">正则表达式的内容</param>
/// <param name="strVal">需验证的字符串</param>
public static bool IsMatch(string pattern, string strVal)
{
if (strVal == null) return false;
Regex myRegex = new Regex(pattern);
if (strVal.Length == 0) return false;
return myRegex.IsMatch(strVal);
}
#endregion
#region 6、验证字符串是否纯数字
/// <summary>
/// 验证字符串是否纯数字
/// </summary>
/// <param name="_value">需验证字符串</param>
/// <param name="Topoint">是否含有小数点</param>
public static bool IsNumber(string _value, bool Topoint = false)
{
if (Topoint)
{
return IsMatch("^[1-9]*[0-9]*$", _value);
}
else
{
return IsMatch(@"^[1-9]\d{0,7}(\.\d{1,6})?$", _value);
}
}
#endregion
#region 7、对字符串进行MD5加密
/// <summary>
/// 对字符串进行MD5加密
/// </summary>
/// <param name="str">源字符串</param>
public static string MD5Encrypt(string str)
{
MD5 MD = new MD5CryptoServiceProvider();
byte[] b = MD.ComputeHash(Encoding.UTF8.GetBytes(str));
string Result = BitConverter.ToString(b);
Result = Result.Replace("-", "");
return Result.Substring(8, 16);
}
#endregion
#region 8、DES加密
/// <summary>
/// DES加密
/// </summary>
/// <param name="pToEncrypt">加密字符串</param>
/// <param name="sKey">密钥</param>
public static string DESEncrypt(string pToEncrypt, string sKey)
{
if (pToEncrypt == "") return "";
if (sKey.Length < 8) sKey = sKey + "xuE29xWp";
if (sKey.Length > 8) sKey = sKey.Substring(0, 8);
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
//把字符串放到byte数组中
//原来使用的UTF8编码，我改成Unicode编码了，不行
byte[] inputByteArray = Encoding.Default.GetBytes(pToEncrypt);
//建立加密对象的密钥和偏移量
//原文使用ASCIIEncoding.ASCII方法的GetBytes方法
//使得输入密码必须输入英文文本
des.Key = ASCIIEncoding.Default.GetBytes(sKey);
des.IV = ASCIIEncoding.Default.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
//Write the byte array into the crypto stream
//(It will end up in the memory stream)
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
//Get the data back from the memory stream, and into a string
StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
//Format as hex
ret.AppendFormat("{0:X2}", b);
}
ret.ToString();
return ret.ToString();
}
#endregion
#region 9、DES解密
/// <summary>
/// DES解密
/// </summary>
/// <param name="pToDecrypt">解密字符串</param>
/// <param name="sKey">解密密钥</param>
/// <param name="outstr">返回值</param>
public static bool DESDecrypt(string pToDecrypt, string sKey, out string outstr)
{
if (pToDecrypt == "")
{
outstr = "";
return true;
};
if (sKey.Length < 8) sKey = sKey + "xuE29xWp";
if (sKey.Length > 8) sKey = sKey.Substring(0, 8);
try
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
//Put the input string into the byte array
byte[] inputByteArray = new byte[pToDecrypt.Length / 2];
for (int x = 0; x < pToDecrypt.Length / 2; x++)
{
int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));
inputByteArray[x] = (byte)i;
}
//建立加密对象的密钥和偏移量，此值重要，不能修改
des.Key = ASCIIEncoding.Default.GetBytes(sKey);
des.IV = ASCIIEncoding.Default.GetBytes(sKey);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
//Flush the data through the crypto stream into the memory stream
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
//Get the decrypted data back from the memory stream
//建立StringBuild对象，CreateDecrypt使用的是流对象，必须把解密后的文本变成流对象
StringBuilder ret = new StringBuilder();
outstr = System.Text.Encoding.Default.GetString(ms.ToArray());
return true;
}
catch
{
outstr = "";
return false;
}
}
#endregion
}
}
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