下面是使用使用块，这将关闭该文件为你读文件的示例

Below is an example of reading a file using a using block, which will close the file for you:

using (FileStream fs = File.OpenRead(@"c:\path\filename.txt")) //Open the file here
{
    using (StreamReader sr = new StreamReader(fs))
    {
        while (!sr.EndOfStream)
        {
            Console.WriteLine(sr.ReadLine());
        }
    }
} //File will close when scope of this brace ends.

有些人preFER省略括号外的水平时，有连续的使用块。我已经包括了他们的清晰度。请注意，使用块使用尝试，终于在幕后块，以确保您的文件将关闭，即使有是未捕获的异常。这是一件好事。

Some people prefer to omit the outer level of the braces when there are consecutive using blocks. I have included them for clarity. Note that a using block uses a try-finally block under the covers to ensure that your file will close even if there is an uncaught exception. This is a good thing.

参见 RAII 。