學用 ASP.Net 之 “字串” (1): 基礎

字串串連:

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

從字串中提取字元:

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}

從字串中遍曆字元:

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

從字元編碼轉義到字元:

protected void Button1_Click(object sender, EventArgs e){    string str = "\u4e07\u4e00";    Response.Write(str); //萬一}

判斷兩字串是否相同:

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

使用 @ 免轉義:

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

使用建構函式:

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("<br />");    str = new string(cs, 2, 3);    Response.Write(str);    //cde    Response.Write("<br />");    str = new string('a', 7);    Response.Write(str);    //aaaaaaa    Response.Write("<br />");}