Exception Handling Statements (C# Reference)

最新推荐文章于 2025-09-04 16:26:07 发布

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原文链接：http://www.cnblogs.com/chucklu/p/4653713.html

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本文介绍了 C# 中使用 try-catch-finally 语句来处理异常的方法，并通过一个读取文件的例子展示了如何在 try 块中获取资源，在 catch 块中处理异常情况，并在 finally 块中释放资源。

Exception Handling Statements (C# Reference)

C# provides built-in support for handling anomalous situations, known as exceptions, which may occur during the execution of your program. These exceptions are handled by code that is outside the normal flow of control.

The following exception handling topics are explained in this section:

try-catch-finally (C# Reference)

A common usage of catch and finally together is to

obtain and use resources in a try block,

deal with exceptional circumstances in a catch block,

and release the resources in the finally block.

For more information and examples on re-throwing exceptions, see try-catch and Throwing Exceptions.

For more information about the finallyblock, see try-finally.

public class EHClass
{
    void ReadFile(int index)
    {
        // To run this code, substitute a valid path from your local machine
        string path = @"c:\users\public\test.txt";
        System.IO.StreamReader file = new System.IO.StreamReader(path);
        char[] buffer = new char[10];
        try
        {
            file.ReadBlock(buffer, index, buffer.Length);
        }
        catch (System.IO.IOException e)
        {
            Console.WriteLine("Error reading from {0}. Message = {1}", path, e.Message);
        }

        finally
        {
            if (file != null)
            {
                file.Close();
            }
        }
        // Do something with buffer...
    }

}