学用 ASP.Net 之 "字符串" (1): 基础
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 onlyResponse.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] + "<br/>"); } foreach (char c in str) { Response.Write("<hr/>" + 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("<br/>"); 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("<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("<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/>"); }