C# 截取字符串的方法

根據單個分隔字符用split截取

string st="GT123_1";

string[] sArray=st.Split('_');

//即可得到sArray[0]="GT123",sArray[1]="1";

利用多個字符來分隔字符串

string str = "GTAZB_JiangjBen_123";
string[] sArray = str.Split(new char[2] { 'j', '_' });
foreach(string e in sArray)
{
  Console.WriteLine(e);
}

//得到sArray[0]="GTAZB",sArray[1]="Jiang",sArray[2]="Ben",sArray[3]="123";

根據字符串或字符串組來截取字符串

string str = "GTAZB_JiangjBen_123";
string[] sArray = str.Split( new string[]{'Ji','jB'}, StringSplitOptions.RemoveEmptyEntries);
foreach(string e in sArray)
{
  Console.WriteLine(e);
}

//得到sArray[0]="GTAZB_",sArray[1]="ang",sArray[2]="en_123";

提取字符串中的第i個字符開始的長度爲j的字符串

string str = "GTAZB_JiangjBen_123";
int start=3,length=8; 
Console.WriteLine(str.Substring(start-1, length));

//輸出得到AZB_Jian。

提取字符串中右數長度爲i的字符串

string str = "GTAZB_JiangjBen_123";
string tSt;
int i=5;
tSt = str.Substring(str.Length - i); 
Console.WriteLine(tSt);

//輸出n_123

替換字符串中的特定字符串

string str = "GTAZB_JiangjBen_123";
string tSt;
tSt = str.Replace("123","321");
Console.WriteLine(tSt);

//輸出GTAZB_JiangjBen_321

刪除字符串中的特定字符串Jiangj

string str = "GTAZB_JiangjBen_123";
string tSt;
tSt = str.Replace("Jiangj","");
Console.WriteLine(tSt);

//輸出GTAZB_Ben_123

刪除指定位置(第i個)的指定長度（length）的字符串

 string str = "GTAZB_JiangjBen_123";

int i=5,length=8;
str=str.remove(i,length);
console.writeline(str);

//輸出GTAZBen_123
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