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我注意到一個令人沮喪的問題,在該問題中,標準的Winform控件在調試會話期間不會像在調用控件的DoDragDrop方法之後那樣應進入拖放操作。源控件(從中啟動拖放操作)的行為就像它不支持拖放一樣。 
就我而言,事實證明我在Visual Studio 2017的第二個實例中運行調試會話。當我停止運行Visual Studio的第二個調試會話實例時(我能夠保持Visual Studio的打開狀態,我只需要停止我的調試會話),Visual Studio的第一個調試會話實例中的拖動操作開始按預期進行。
顯然,拖放應該在兩個不同的Visual Studio實例中同時打開的兩個調試會話中起作用-有時在我的系統上也是如此。但是,有時會發生某些事情(我不確定是什麼)來“破壞” VS IDE或.NET子系統,從而導致Winform拖動操作不再起作用。
即使重新啟動後也會發生此行為,並且在具有.NET 4.7.02556的最新VS Enterprise 2017 IDE(版本15.5.6)中會發生此行為。
我意識到這個問題及其解決方案相當模糊,但是我覺得這足以在這裡有用(而且我花了大量時間弄清楚發生了什麼!)。
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