AppendAllLines替代解决方案

Question

我想写从C＃一个txt文件，如下所示：

File.WriteAllText("important.txt", Convert.ToString(c)); 
File.AppendAllLines("important.txt", (from r in rec 
        select r.name + " " + r.num1 + " " + r.num2 + " " + r.mult + " " + r.rel).ToArray()); 

我收到错误AppendAllLInes没有发现有System.IO.File任何替代方法或我怎么能包括AppendAllLInes

Answer 1

一次写完。

var part1 = Convert.ToString(c); 
var part2 = String.Join(Environment.NewLine, 
       rec.Select(r => r.name + " " + r.num1 + " " + r.num2 + " " + r.mult + " " + r.rel) 
       .ToArray()); 
System.IO.File.WriteAllText("important.txt", part1 + part2); 

您也可以使用在3.5 WriteAllLines：

var allLines = new []{Convert.ToString(c)} 
       .Concat(rec.Select(r => r.name + " " + r.num1 + " " + r.num2 + " " + r.mult + " " + r.rel)) 
       .ToArray(); 
System.IO.File.WriteAllLines("important.txt", allLines);