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C# 文件


操作文件

来自 System.IO 命名空间的 File 类允许我们操作文件。

示例

using System.IO;  // include the System.IO namespace

File.SomeFileMethod();  // use the file class with methods

File 类有很多有用的方法来创建和获取有关文件的信息。例如:

方法 描述
AppendText() 在现有文件的末尾追加文本
Copy() 复制文件
Create() 创建或覆盖文件
Delete() 删除文件
Exists() 测试文件是否存在
ReadAllText() 读取文件内容
Replace() 用另一个文件的内容替换文件的内容
WriteAllText() 创建一个新文件并将内容写入其中。如果文件已存在,则将被覆盖。

有关 File 方法的完整列表,请访问 Microsoft .Net 文件类参考


写入文件并读取它

在下面的示例中,我们使用 WriteAllText() 方法创建一个名为 "filename.txt" 的文件并向其中写入一些内容。然后我们使用 ReadAllText() 方法读取文件的内容。

示例

using System.IO;  // include the System.IO namespace

string writeText = "Hello World!";  // Create a text string
File.WriteAllText("filename.txt", writeText);  // Create a file and write the content of writeText to it

string readText = File.ReadAllText("filename.txt");  // Read the contents of the file
Console.WriteLine(readText);  // Output the content

输出将是

Hello World!
运行示例 »

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