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原文链接：https://blog.csdn.net/weixin_45707610/article/details/131122420

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1.根据单个分隔字符用split截取

string st="GT123_1";
string[] sArray=st.split("_");

即可得到sArray[0]="GT123",sArray[1]="1";

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2.利用多个字符来分隔字符串

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";

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3.根据字符串或字符串组来截取字符串

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";

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4.提取字符串中的第i个字符开始的长度为j的字符串：中间截取

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

输出得到AZB_Jian。

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5.提取字符串中右数长度为i的字符串：右截取

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

输出n_123;

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6.替换字符串中的特定字符串：替换文本

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

输出GTAZB_JiangjBen_321

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7.删除字符串中的特定字符串Jiangj：删除文本

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

输出GTAZB_Ben_123

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8.删除指定位置(第i个)的指定长度（length）的字符串：删除文本

string str = "GTAZB_JiangjBen_123";
int i=5,length=8;
str=str.remove(i,length);
console.writeline(str);

输出GTAZBen_123。