C#中using

using當執行完程式碼段立即呼叫例項的Dispose
例子：

public static bool MergeDiff(string ver1, string ver2, string diff)
{
    try
    {
        using(var src = new FileStream(ver1, FileMode.Open, FileAccess.Read))
        {
            using(var dst = new FileStream(ver2, FileMode.CreateNew, FileAccess.Write))
            {
                using
 
(var rd = new FileStream(diff, FileMode.Open, FileAccess.Read))
                {
                    bool r = MergeDiff(src, dst, rd);
                    return r;
                }
            }
        }
    }
    catch(System.Exception exp)
    {
        AppLog.Error("MergeDiff Failed : " + exp.ToString());
        return
 
 false;
    }
}