Description: Drag-and-drop to open the file C# to get the file directory or path information, simply drag the file to the main form, you can get to the directory path to the selected file, a pop-up window tells you. This drag-and-drop method to open the file specific to the Windows system, it is very easy to join such a function in C# is quite simple, the program code can be found.
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File list (Check if you may need any files):
FileCatalog\FileCatalog\FileCatalog.csproj
...........\...........\Form1.cs
...........\...........\Form1.Designer.cs
...........\...........\Form1.resx
...........\...........\Program.cs
...........\...........\...perties\AssemblyInfo.cs
...........\...........\..........\Resources.Designer.cs
...........\...........\..........\Resources.resx
...........\...........\..........\Settings.Designer.cs
...........\...........\..........\Settings.settings
...........\FileCatalog.sln
...........\FileCatalog.suo
...........\...........\Properties
...........\FileCatalog
FileCatalog