try..catch..finally

最新推荐文章于 2025-12-28 09:18:17 发布

转载最新推荐文章于 2025-12-28 09:18:17 发布 · 320 阅读

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#exception #string #null #output #class #c#

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本文介绍了C#中使用try-catch进行异常处理的方法，并通过两个示例展示了如何捕获和处理不同类型的异常。

       try
        {
            ProcessString(s);
        }

        catch (Exception e)
        {
            Console.WriteLine("{0} Exception caught.", e);
        }
        finally
        {
        }

============================================================

复制代码

    class TryFinallyTest
{
    static void ProcessString(string s)
    {
        if (s == null)
        {
            throw new ArgumentNullException();
        }
    }

    static void Main()
    {
        string s = null; // For demonstration purposes.

        try
        {            
            ProcessString(s);
        }

        catch (Exception e)
        {
            Console.WriteLine("{0} Exception caught.", e);
        }
    }
}
    /*
    Output:
    System.ArgumentNullException: Value cannot be null.
       at TryFinallyTest.Main() Exception caught.
     * */

=================================================================

复制代码

class ThrowTest3
{
    static void ProcessString(string s)
    {
        if (s == null)
        {
            throw new ArgumentNullException();
        }
    }

    static void Main()
    {
        try
        {
            string s = null;
            ProcessString(s);
        }
        // Most specific:
        catch (ArgumentNullException e)
        {
            Console.WriteLine("{0} First exception caught.", e);
        }
        // Least specific:
        catch (Exception e)
        {
            Console.WriteLine("{0} Second exception caught.", e);
        }
    }
}
/*
 Output:
System.ArgumentNullException: Value cannot be null.
   at TryFinallyTest.Main() First exception caught.
*/