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There are a lot of different ways to read and write files ( text files , not binary) in C#. 在C＃中，有许多不同的方式来读写文件（ 文本文件 ，而不是二进制文件）。

I just need something that is easy and uses the least amount of code, because I am going to be working with files a lot in my project. 我只需要一些简单且使用最少代码的东西，因为我将在项目中处理很多文件。 I only need something for string since all I need is to read and write string s. 我只需要一些string因为我需要的是读写string s。

#1楼

参考：

#2楼

It's good when reading to use the OpenFileDialog control to browse to any file you want to read. 读取时最好使用OpenFileDialog控件浏览到要读取的任何文件。 Find the code below: 查找下面的代码：

Don't forget to add the following using statement to read files: using System.IO; 不要忘记添加以下using语句来读取文件： using System.IO;

private void button1_Click(object sender, EventArgs e){    if (openFileDialog1.ShowDialog() == DialogResult.OK)    {         textBox1.Text = File.ReadAllText(openFileDialog1.FileName);      }}

To write files you can use the method File.WriteAllText . 要写入文件，可以使用File.WriteAllText方法。

#3楼

FileStream fs = new FileStream(txtSourcePath.Text,FileMode.Open, FileAccess.Read);using(StreamReader sr = new StreamReader(fs)){   using (StreamWriter sw = new StreamWriter(Destination))   {            sw.writeline("Your text");    }}

#4楼

@AlexeiLevenkov pointed me at another "easiest way" namely the . @AlexeiLevenkov向我指出了另一种“最简单的方法”，即 。 It takes just a little coding, then provides the absolute easiest way to read/write, plus it offers the flexibility to create variations according to your personal needs. 它只需要一点编码，然后提供绝对最简单的读/写方式，此外，它还提供了根据您的个人需求创建变体的灵活性。 Here is a complete example: 这是一个完整的示例：

This defines the extension method on the string type. 这定义了string类型的扩展方法。 Note that the only thing that really matters is the function argument with extra keyword this , that makes it refer to the object that the method is attached to. 请注意，唯一真正重要的是带有额外关键字this的function参数，这使其引用该方法所附加的对象。 The class name does not matter; 类名无关紧要； the class and method must be declared static . 该类和方法必须声明为static 。

using System.IO;//File, Directory, Pathnamespace Lib{    /// 
    /// Handy string methods    /// 
    public static class Strings    {        /// 
        /// Extension method to write the string Str to a file        /// 
        ///         ///         public static void WriteToFile(this string Str, string Filename)        {            File.WriteAllText(Filename, Str);            return;        }        // of course you could add other useful string methods...    }//end class}//end ns

This is how to use the string extension method , note that it refers automagically to the class Strings : 这是使用string extension method ，请注意，它自动引用了class Strings ：

using Lib;//(extension) method(s) for stringnamespace ConsoleApp_Sandbox{    class Program    {        static void Main(string[] args)        {            "Hello World!".WriteToFile(@"c:\temp\helloworld.txt");            return;        }    }//end class}//end ns

I would never have found this myself, but it works great, so I wanted to share this. 我自己永远不会找到这个，但是它很好用，所以我想分享一下。 Have fun! 玩得开心！

#5楼

Or, if you are really about lines: 或者，如果您确实是关于行的：

System.IO.File also contains a static method WriteAllLines , so you could do: System.IO.File还包含一个静态方法WriteAllLines ，因此您可以执行以下操作：

IList
   
     myLines = new List
    
     (){    "line1",    "line2",    "line3",};File.WriteAllLines("./foo", myLines);
    
   

#6楼

The easiest way to read from a file and write to a file: 从文件读取并写入文件的最简单方法：

//Read from a filestring something = File.ReadAllText("C:\\Rfile.txt");//Write to a fileusing (StreamWriter writer = new StreamWriter("Wfile.txt")){    writer.WriteLine(something);}

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