1. 程式人生 > >C# 字串處理類

C# 字串處理類

using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;

namespace ZD.Utilities
{
/// <summary>
/// 字串操作類
/// 1、GetStrArray(string str, char speater, bool toLower) 把字串按照分隔符轉換成 List
/// 2、GetStrArray(string str) 把字串轉 按照, 分割 換為資料
/// 3、GetArrayStr(List list, string speater) 把 List 按照分隔符組裝成 string
/// 4、GetArrayStr(List list) 得到陣列列表以逗號分隔的字串
/// 5、GetArrayValueStr(Dictionary<int, int> list)得到陣列列表以逗號分隔的字串
/// 6、DelLastComma(string str)刪除最後結尾的一個逗號
/// 7、DelLastChar(string str, string strchar)刪除最後結尾的指定字元後的字元
/// 8、ToSBC(string input)轉全形的函式(SBC case)
/// 9、ToDBC(string input)轉半形的函式(SBC case)
/// 10、GetSubStringList(string o_str, char sepeater)把字串按照指定分隔符裝成 List 去除重複
/// 11、GetCleanStyle(string StrList, string SplitString)將字串樣式轉換為純字串
/// 12、GetNewStyle(string StrList, string NewStyle, string SplitString, out string Error)將字串轉換為新樣式
/// 13、SplitMulti(string str, string splitstr)分割字串
/// 14、SqlSafeString(string String, bool IsDel)
/// </summary>
public class StringHelper
{
/// <summary>
/// 把字串按照分隔符轉換成 List
/// </summary>
/// <param name="str">源字串</param>
/// <param name="speater">分隔符</param>
/// <param name="toLower">是否轉換為小寫</param>
/// <returns></returns>
public static List<string> GetStrArray(string str, char speater, bool toLower)
{
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();
}
list.Add(strVal);
}
}
return list;
}
/// <summary>
/// 把字串轉 按照, 分割 換為資料
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string[] GetStrArray(string str)
{
return str.Split(new Char[] { ',' });
}
/// <summary>
/// 把 List<string> 按照分隔符組裝成 string
/// </summary>
/// <param name="list"></param>
/// <param name="speater"></param>
/// <returns></returns>
public static string GetArrayStr(List<string> list, string speater)
{
StringBuilder sb = new StringBuilder();
for (int i = 0; i < list.Count; i++)
{
if (i == list.Count - 1)
{
sb.Append(list[i]);
}
else
{
sb.Append(list[i]);
sb.Append(speater);
}
}
return sb.ToString();
}
/// <summary>
/// 得到陣列列表以逗號分隔的字串
/// </summary>
/// <param name="list"></param>
/// <returns></returns>
public static string GetArrayStr(List<int> list)
{
StringBuilder sb = new StringBuilder();
for (int i = 0; i < list.Count; i++)
{
if (i == list.Count - 1)
{
sb.Append(list[i].ToString());
}
else
{
sb.Append(list[i]);
sb.Append(",");
}
}
return sb.ToString();
}
/// <summary>
/// 得到陣列列表以逗號分隔的字串
/// </summary>
/// <param name="list"></param>
/// <returns></returns>
public static string GetArrayValueStr(Dictionary<int, int> list)
{
StringBuilder sb = new StringBuilder();
foreach (KeyValuePair<int, int> kvp in list)
{
sb.Append(kvp.Value + ",");
}
if (list.Count > 0)
{
return DelLastComma(sb.ToString());
}
else
{
return "";
}
}


#region 刪除最後一個字元之後的字元

/// <summary>
/// 刪除最後結尾的一個逗號
/// </summary>
public static string DelLastComma(string str)
{
return str.Substring(0, str.LastIndexOf(","));
}

/// <summary>
/// 刪除最後結尾的指定字元後的字元
/// </summary>
public static string DelLastChar(string str, string strchar)
{
return str.Substring(0, str.LastIndexOf(strchar));
}

#endregion

 


/// <summary>
/// 轉全形的函式(SBC case)
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static string ToSBC(string input)
{
//半形轉全形:
char[] c = input.ToCharArray();
for (int i = 0; i < c.Length; i++)
{
if (c[i] == 32)
{
c[i] = (char)12288;
continue;
}
if (c[i] < 127)
c[i] = (char)(c[i] + 65248);
}
return new string(c);
}

/// <summary>
/// 轉半形的函式(SBC case)
/// </summary>
/// <param name="input">輸入</param>
/// <returns></returns>
public static string ToDBC(string input)
{
char[] c = input.ToCharArray();
for (int i = 0; i < c.Length; i++)
{
if (c[i] == 12288)
{
c[i] = (char)32;
continue;
}
if (c[i] > 65280 && c[i] < 65375)
c[i] = (char)(c[i] - 65248);
}
return new string(c);
}

/// <summary>
/// 把字串按照指定分隔符裝成 List 去除重複
/// </summary>
/// <param name="o_str"></param>
/// <param name="sepeater"></param>
/// <returns></returns>
public static List<string> GetSubStringList(string o_str, char sepeater)
{
List<string> list = new List<string>();
string[] ss = o_str.Split(sepeater);
foreach (string s in ss)
{
if (!string.IsNullOrEmpty(s) && s != sepeater.ToString())
{
list.Add(s);
}
}
return list;
}


#region 將字串樣式轉換為純字串
/// <summary>
/// 將字串樣式轉換為純字串
/// </summary>
/// <param name="StrList"></param>
/// <param name="SplitString"></param>
/// <returns></returns>
public static string GetCleanStyle(string StrList, string SplitString)
{
string RetrunValue = "";
//如果為空,返回空值
if (StrList == null)
{
RetrunValue = "";
}
else
{
//返回去掉分隔符
string NewString = "";
NewString = StrList.Replace(SplitString, "");
RetrunValue = NewString;
}
return RetrunValue;
}
#endregion

#region 將字串轉換為新樣式
/// <summary>
/// 將字串轉換為新樣式
/// </summary>
/// <param name="StrList"></param>
/// <param name="NewStyle"></param>
/// <param name="SplitString"></param>
/// <param name="Error"></param>
/// <returns></returns>
public static string GetNewStyle(string StrList, string NewStyle, string SplitString, out string Error)
{
string ReturnValue = "";
//如果輸入空值,返回空,並給出錯誤提示
if (StrList == null)
{
ReturnValue = "";
Error = "請輸入需要劃分格式的字串";
}
else
{
//檢查傳入的字串長度和樣式是否匹配,如果不匹配,則說明使用錯誤。給出錯誤資訊並返回空值
int strListLength = StrList.Length;
int NewStyleLength = GetCleanStyle(NewStyle, SplitString).Length;
if (strListLength != NewStyleLength)
{
ReturnValue = "";
Error = "樣式格式的長度與輸入的字元長度不符,請重新輸入";
}
else
{
//檢查新樣式中分隔符的位置
string Lengstr = "";
for (int i = 0; i < NewStyle.Length; i++)
{
if (NewStyle.Substring(i, 1) == SplitString)
{
Lengstr = Lengstr + "," + i;
}
}
if (Lengstr != "")
{
Lengstr = Lengstr.Substring(1);
}
//將分隔符放在新樣式中的位置
string[] str = Lengstr.Split(',');
foreach (string bb in str)
{
StrList = StrList.Insert(int.Parse(bb), SplitString);
}
//給出最後的結果
ReturnValue = StrList;
//因為是正常的輸出,沒有錯誤
Error = "";
}
}
return ReturnValue;
}
#endregion

/// <summary>
/// 分割字串
/// </summary>
/// <param name="str"></param>
/// <param name="splitstr"></param>
/// <returns></returns>
public static string[] SplitMulti(string str, string splitstr)
{
string[] strArray = null;
if ((str != null) && (str != ""))
{
strArray = new Regex(splitstr).Split(str);
}
return strArray;
}
public static string SqlSafeString(string String, bool IsDel)
{
if (IsDel)
{
String = String.Replace("'", "");
String = String.Replace("\"", "");
return String;
}
String = String.Replace("'", "&#39;");
String = String.Replace("\"", "&#34;");
return String;
}

#region 獲取正確的Id,如果不是正整數,返回0
/// <summary>
/// 獲取正確的Id,如果不是正整數,返回0
/// </summary>
/// <param name="_value"></param>
/// <returns>返回正確的整數ID,失敗返回0</returns>
public static int StrToId(string _value)
{
if (IsNumberId(_value))
return int.Parse(_value);
else
return 0;
}
#endregion
#region 檢查一個字串是否是純數字構成的,一般用於查詢字串引數的有效性驗證。
/// <summary>
/// 檢查一個字串是否是純數字構成的,一般用於查詢字串引數的有效性驗證。(0除外)
/// </summary>
/// <param name="_value">需驗證的字串。。</param>
/// <returns>是否合法的bool值。</returns>
public static bool IsNumberId(string _value)
{
return QuickValidate("^[1-9]*[0-9]*$", _value);
}
#endregion
#region 快速驗證一個字串是否符合指定的正則表示式。
/// <summary>
/// 快速驗證一個字串是否符合指定的正則表示式。
/// </summary>
/// <param name="_express">正則表示式的內容。</param>
/// <param name="_value">需驗證的字串。</param>
/// <returns>是否合法的bool值。</returns>
public static bool QuickValidate(string _express, string _value)
{
if (_value == null) return false;
Regex myRegex = new Regex(_express);
if (_value.Length == 0)
{
return false;
}
return myRegex.IsMatch(_value);
}
#endregion


#region 根據配置對指定字串進行 MD5 加密
/// <summary>
/// 根據配置對指定字串進行 MD5 加密
/// </summary>
/// <param name="s"></param>
/// <returns></returns>
public static string GetMD5(string s)
{
//md5加密
s = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(s, "md5").ToString();

return s.ToLower().Substring(8, 16);
}
#endregion

#region 得到字串長度,一個漢字長度為2
/// <summary>
/// 得到字串長度,一個漢字長度為2
/// </summary>
/// <param name="inputString">引數字串</param>
/// <returns></returns>
public static int StrLength(string inputString)
{
System.Text.ASCIIEncoding ascii = new System.Text.ASCIIEncoding();
int tempLen = 0;
byte[] s = ascii.GetBytes(inputString);
for (int i = 0; i < s.Length; i++)
{
if ((int)s[i] == 63)
tempLen += 2;
else
tempLen += 1;
}
return tempLen;
}
#endregion

#region 擷取指定長度字串
/// <summary>
/// 擷取指定長度字串
/// </summary>
/// <param name="inputString">要處理的字串</param>
/// <param name="len">指定長度</param>
/// <returns>返回處理後的字串</returns>
public static string ClipString(string inputString, int len)
{
bool isShowFix = false;
if (len % 2 == 1)
{
isShowFix = true;
len--;
}
System.Text.ASCIIEncoding ascii = new System.Text.ASCIIEncoding();
int tempLen = 0;
string tempString = "";
byte[] s = ascii.GetBytes(inputString);
for (int i = 0; i < s.Length; i++)
{
if ((int)s[i] == 63)
tempLen += 2;
else
tempLen += 1;

try
{
tempString += inputString.Substring(i, 1);
}
catch
{
break;
}

if (tempLen > len)
break;
}

byte[] mybyte = System.Text.Encoding.Default.GetBytes(inputString);
if (isShowFix && mybyte.Length > len)
tempString += "…";
return tempString;
}
#endregion

 

#region HTML轉行成TEXT
/// <summary>
/// HTML轉行成TEXT
/// </summary>
/// <param name="strHtml"></param>
/// <returns></returns>
public static string HtmlToTxt(string strHtml)
{
string[] aryReg ={
@"<script[^>]*?>.*?</script>",
@"<(\/\s*)?!?((\w+:)?\w+)(\w+(\s*=?\s*(([""'])(\\[""'tbnr]|[^\7])*?\7|\w+)|.{0})|\s)*?(\/\s*)?>",
@"([\r\n])[\s]+",
@"&(quot|#34);",
@"&(amp|#38);",
@"&(lt|#60);",
@"&(gt|#62);",
@"&(nbsp|#160);",
@"&(iexcl|#161);",
@"&(cent|#162);",
@"&(pound|#163);",
@"&(copy|#169);",
@"&#(\d+);",
@"-->",
@"<!--.*\n"
};

string newReg = aryReg[0];
string strOutput = strHtml;
for (int i = 0; i < aryReg.Length; i++)
{
Regex regex = new Regex(aryReg[i], RegexOptions.IgnoreCase);
strOutput = regex.Replace(strOutput, string.Empty);
}

strOutput.Replace("<", "");
strOutput.Replace(">", "");
strOutput.Replace("\r\n", "");


return strOutput;
}
#endregion

#region 判斷物件是否為空
/// <summary>
/// 判斷物件是否為空,為空返回true
/// </summary>
/// <typeparam name="T">要驗證的物件的型別</typeparam>
/// <param name="data">要驗證的物件</param>
public static bool IsNullOrEmpty<T>(T data)
{
//如果為null
if (data == null)
{
return true;
}

//如果為""
if (data.GetType() == typeof(String))
{
if (string.IsNullOrEmpty(data.ToString().Trim()))
{
return true;
}
}

//如果為DBNull
if (data.GetType() == typeof(DBNull))
{
return true;
}

//不為空
return false;
}

/// <summary>
/// 判斷物件是否為空,為空返回true
/// </summary>
/// <param name="data">要驗證的物件</param>
public static bool IsNullOrEmpty(object data)
{
//如果為null
if (data == null)
{
return true;
}

//如果為""
if (data.GetType() == typeof(String))
{
if (string.IsNullOrEmpty(data.ToString().Trim()))
{
return true;
}
}

//如果為DBNull
if (data.GetType() == typeof(DBNull))
{
return true;
}

//不為空
return false;
}
#endregion
}
}