使用System.IO来读取以及修改文本文件

 1 //读取html内容
 2 string htmlUrl = @"new\new.html";
 3 string htmlContent = string.Empty;
 4 using (StreamReader reader = new StreamReader(htmlUrl))
 5 {
 6        htmlContent += reader.ReadToEnd();
 7 }
 8 
 9 //修改html内容
10 string htmlContentNew = "新的html内容"; 
11 using (StreamWriter sw = new StreamWriter(url, false))
12 {
13        sw.Write(htmlContentNew );
14 }