附加在C#的文本文件中

问题描述

我正尝试从C#编写txt文件，如下所示:

I am trying to write a txt file from C# as follows:

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

但是第二个File.WriteAllLines会覆盖文件中的第一个条目.有什么建议我该如何追加数据?

But the second File.WriteAllLines overrides the first entry in the file. Any suggestion how can I append data?

推荐答案

您应使用 File.AppendAllLines ，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());

System.IO.File.AppendAllLines从.NET Framework 4.0开始存在.如果使用的是.NET Framework 3.5，则有AppenAllText方法，您可以这样编写代码:

System.IO.File.AppendAllLines exists from .NET framework 4.0. If you are using .NET framework 3.5, there is AppenAllText method, and you can write your code like this:

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

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