using System;
using System.IO;
using System.Text;

class Test
{
    public static void Main()
    {
             string strToProcess = "fkdfdsfdflkdkfk@dfsdfjk72388389@kdkfkdfkkl@jkdjkfjd@jjjk@";
            strToProcess.Replace("@", Environment.NewLine);
            Console.WriteLine(strToProcess);
    }
}

string str = "fkdfdsfdflkdkfk@dfsdfjk72388389@kdkfkdfkkl@jkdjkfjd@jjjk@";
str = str.Replace("@", Environment.NewLine);
richTextBox1.Text = str;

protected void Button1_Click(object sender, EventArgs e)
{
    string str = "fkdfdsfdflkdkfk@dfsdfjk72388389@kdkfkdfkkl@jkdjkfjd@jjjk@";
    str = str.Replace("@", "@" + "<br/>");
    Response.Write(str);       
}

使用环境。你可以在任何字符串中使用换行符。一个例子:

string text = "fkdfdsfdflkdkfk@dfsdfjk72388389@kdkfkdfkkl@jkdjkfjd@jjjk@";

text = text.Replace("@", "@" + System.Environment.NewLine);

你可以在@符号后面添加一个新的行字符，如下所示:

string newString = oldString.Replace("@", "@\n");  

你也可以在环境类中使用NewLine属性(我认为它是环境)。

string strToProcess = "fkdfdsfdflkdkfk@dfsdfjk72388389@kdkfkdfkkl@jkdjkfjd@jjjk@";
var result = strToProcess.Replace("@", "@ \r\n");
Console.WriteLine(result);

输出