学用 ASP.Net 之 "字符串" (1): 基础-白红宇

学用 ASP.Net 之 "字符串" (1): 基础

阅读量：7055 次

发布时间：2019-06-28

本文共 1852 字，大约阅读时间需要 6 分钟。

字符串连接:

protected void Button1_Click(object sender, EventArgs e){    string str1="abcd", str2="efg";    str1 += str2;    Response.Write(str1); //abcdefg}

从字符串中提取字符:

protected void Button1_Click(object sender, EventArgs e){    string str = "abcdefg";    char c = str[1];   //read only      Response.Write(c); //b    Response.Write(str[str.Length-1]); //g}

从字符串中遍历字符:

protected void Button1_Click(object sender, EventArgs e){    string str = "abcdefg";    for (int i = 0; i < str.Length; i++)    {        Response.Write(str[i] + "
");    }    foreach (char c in str)    {        Response.Write("
    
" + c);    }}

从字符编码转义到字符:

protected void Button1_Click(object sender, EventArgs e){    string str = "\u4e07\u4e00";    Response.Write(str); //万一}

判断两字符串是否相同:

protected void Button1_Click(object sender, EventArgs e){    string str1="abc", str2="ABC";    Response.Write(str1 == str2); //False    Response.Write("
");    Response.Write(str1 != str2); //True}

使用 @ 免转义:

protected void Button1_Click(object sender, EventArgs e){    string str;    str = "c:\\temp\\test.txt";    Response.Write(str);    //c:\temp\test.txt    Response.Write("
");    str = @"c:\temp\test.txt";    Response.Write(str);    //c:\temp\test.txt    Response.Write("
");    str = "\"asp.net\"";    Response.Write(str);    //"asp.net"    Response.Write("
");    str = @"""asp.net""";    Response.Write(str);    //"asp.net"    Response.Write("
");}

使用构造函数:

protected void Button1_Click(object sender, EventArgs e){    string str;    char[] cs = { 'a', 'b', 'c', 'd', 'e', 'f' };    str = new string(cs);    Response.Write(str);    //abcdef    Response.Write("
");    str = new string(cs, 2, 3);    Response.Write(str);    //cde    Response.Write("
");    str = new string('a', 7);    Response.Write(str);    //aaaaaaa    Response.Write("
");}