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  • try...finally的妙用

    受博文 C#中Finally的一个不太常见的用法 的启发,正好在开发中遇到这样一段代码:

    public bool ChangeBlogApp(Guid userID, string oldBlogApp, string newBlogApp)
    {
        CacheFactory.Default.Remove(CacheKeyManager.GetBlogConfigCacheKey(oldBlogApp));
        CacheFactory.Default.Remove(CacheKeyManager.GetBlogConfigCacheKey(newBlogApp));
        return _bcProvider.UpdateBlogApp(userID, newBlogApp);
    }

    需要把2行CacheFactory.Default.Remove的代码移至_bcProvider.UpdateBlogApp之后。

    按照以前的做法,代码会改成这样(增加一个局部变量):

    public bool ChangeBlogApp(Guid userID, string oldBlogApp, string newBlogApp)
    {
        var result = _bcProvider.UpdateBlogApp(userID, newBlogApp);
        CacheFactory.Default.Remove(CacheKeyManager.GetBlogConfigCacheKey(oldBlogApp));
        CacheFactory.Default.Remove(CacheKeyManager.GetBlogConfigCacheKey(newBlogApp));
        return result;
    }

    而使用try...finally,可以无需增加局部变量,代码如下:

    public bool ChangeBlogApp(Guid userID, string oldBlogApp, string newBlogApp)
    {
        try
        {
            return _bcProvider.UpdateBlogApp(userID, newBlogApp);
        }
        finally
        {
            CacheFactory.Default.Remove(CacheKeyManager.GetBlogConfigCacheKey(oldBlogApp));
            CacheFactory.Default.Remove(CacheKeyManager.GetBlogConfigCacheKey(newBlogApp));
        }
    }
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  • 原文地址:https://www.cnblogs.com/dudu/p/try_finally.html
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