Question

C#中split的方法和用法

请告诉我有哪些方法

Answer 1

第一种方法：
string s=abcdeabcdeabcde;
string[] sArray=s.Split('c') ;
foreach(string i in sArray)
Console.WriteLine(i.ToString());
输出下面的结果:
ab
deab
deab
de第二种方法：
我们看到了结果是以一个指定的字符进行的分割。使用另一种构造方法对多个字符进行分割:
string s="abcdeabcdeabcde";
string[] sArray1=s.Split(new char[3]{'c','d','e'}) ;
foreach(string i in sArray1)
Console.WriteLine(i.ToString());
可以输出下面的结果：
ab
ab
ab第三种方法：
除了以上的这两种方法以外,第三种方法是使用正则表达式。新建一个控制台项目。然后先添加 using System.Text.RegularExpressions;
System.Text.RegularExpressions
string content=agcsmallmacsmallgggsmallytx;
string[]resultString=Regex.Split(content,small,RegexOptions.IgnoreCase)
foreach(string i in resultString)
Console.WriteLine(i.ToString());
输出下面的结果:
agc
mac
ggg
ytx第四种方法：
string str1=我*****是*****一*****个*****教*****师;
string[] str2;
str1=str1.Replace(*****,*) ;
str2=str1.Split(*) ;
foreach(string i in str2)
Console.WriteLine(i.ToString());第五种方法：
string str1=我**是*****一*****个*****教*****师;
我希望显示的结果为:我是一个教师。
我如果采用上面的第四种方法来做就会产生下面的错误：我 是一个教师。中间有空格输出，所以输出结果并不是希望的结果，这就又回到了正则表达式了，这时可以采用下面的第五种方法：
string str1=我**是*****一*****个*****教*****师;
string[] str2 = System.Text.RegularExpressions.Regex.Split(str1,@[*]+);
foreach(string i in str2)
Console.WriteLine(i.ToString());

Answer 2

分割字符串函数split /// <summary>
/// 字符串分割符
/// </summary>
public const string SEPARATORSTRING = "@#$@#$"; /// <summary>
/// 取得字符的第几个字符，通过分割符分割的字符串,pos以1开始
/// </summary>
/// <param name="str">字符串</param>
/// <param name="separator">分割符</param>
/// <param name="pos">第几个</param>
/// <returns>返回第几个字符串</returns>
/// <example>string str = Split("rrrrddrew@@tqwewerewddccc", "@@", 1);</example>
public static string Split(string str, string separator, int pos)
{
int Len = str.Length;
int Count = str.Length - str.Replace(separator, "").Length;
int BitCount = 0;
string returnValue = "";
string strValue = "";
string InSeparator = "";
if (Count == 0)
{
return str;
}
InSeparator = str.Substring(str.Length - separator.Length, separator.Length);
if (InSeparator != separator)
{
str += separator;
}for (int i = 0; i < Count; i++)
{
BitCount = str.IndexOf(separator, 0);
strValue = str.Substring(0, BitCount);
str = str.Replace(strValue + separator, "");
if (i == pos - 1)
{
returnValue = strValue;
break;
}
}
return returnValue;
}
/// <summary>
/// 取得字符的第几个字符，通过分割符分割的字符串,pos以1开始，以默认的字符串分割
/// </summary>
/// <param name="str">字符串</param>
/// <param name="pos">第几个</param>
/// <returns>返回第几个字符串</returns>
/// <example>string str = Split("rrrrddrew@@tqwewerewddccc",1);</example>
public static string Split(string str, int pos)
{
int Len = str.Length;
int Count = str.Length - str.Replace(SEPARATORSTRING, "").Length;
int BitCount = 0;
string returnValue = "";
string strValue = "";
string InSeparator = "";
if (Count == 0)
{
return str;
}
InSeparator = str.Substring(str.Length - SEPARATORSTRING.Length, SEPARATORSTRING.Length);
if (InSeparator != SEPARATORSTRING)
{
str += SEPARATORSTRING;
}for (int i = 0; i < Count; i++)
{
BitCount = str.IndexOf(SEPARATORSTRING, 0);
strValue = str.Substring(0, BitCount);
str = str.Replace(strValue + SEPARATORSTRING, "");
if (i == pos - 1)
{
returnValue = strValue;
break;
}
}
return returnValue;
}
/// <summary>
/// 取得分割后的字符串数据,数组以0开始
/// </summary>
/// <param name="str">字符串</param>
/// <param name="separator">分割符</param>
/// <returns>返回分割后的字符串数组</returns>
/// <example>string str=Split("rrrrddrew@@tqwewerewddccc@@", "@@")[1].ToString()</example>
public static string[] Split(string str, string separator)
{
int Len = str.Length;
int Count = 0;
int BitCount = 0;
string strValue = "";
string InSeparator = "";
InSeparator = str.Substring(str.Length - separator.Length, separator.Length);
if (InSeparator != separator)
{
str += separator;
}
Count = (str.Length - str.Replace(separator, "").Length) / separator.Length;
string[] returnValue = new string[Count];
for (int i = 0; i < Count; i++)
{
BitCount = str.IndexOf(separator, 0);
strValue = str.Substring(0, BitCount);
str = str.Replace(strValue + separator, "");
//MessageBox.Show(BitCount.ToString() + ";" + strValue.ToString() + ";" + str);
returnValue[i] = strValue;}
return returnValue;
}
/// <summary>
/// 取得分割后的字符串数据,数组以0开始,以默认的字符串分割
/// </summary>
/// <param name="str">字符串</param>
/// <returns>返回分割后的字符串数组</returns>
/// <example>string str=Split("rrrrddrew@@tqwewerewddccc@@")[1].ToString()</example>
public static string[] Split(string str)
{
int Len = str.Length;
int Count = 0;
int BitCount = 0;
string strValue = "";
string InSeparator = "";
InSeparator = str.Substring(str.Length - SEPARATORSTRING.Length, SEPARATORSTRING.Length);
if (InSeparator != SEPARATORSTRING)
{
str += SEPARATORSTRING;
}
Count = (str.Length - str.Replace(SEPARATORSTRING, "").Length) / SEPARATORSTRING.Length;
string[] returnValue = new string[Count];
for (int i = 0; i < Count; i++)
{
BitCount = str.IndexOf(SEPARATORSTRING, 0);
strValue = str.Substring(0, BitCount);
str = str.Replace(strValue + SEPARATORSTRING, "");
//MessageBox.Show(BitCount.ToString() + ";" + strValue.ToString() + ";" + str);
returnValue[i] = strValue;}
return returnValue;
}