How to programmatically derive windows downloads folder “%USERPROFILE%/Downloads”?

问题

In .Net we can retreive the paths to 'special folders', like Documents/Desktop etc. Today I tried to find a way to get the path to the 'Downloads' folder, but it's not special enough it seems.

I know I can just do 'C:\Users\Username\Downloads', but that seems an ugly solution. So how can I retreive the path using .Net?

回答1:

The problem of your first answer is it would give you WRONG result if the default Downloads Dir has been changed to [Download1]! The proper way to do it covering all possibilities is

using System;
using System.Runtime.InteropServices;

static class cGetEnvVars_WinExp    {
    [DllImport("Shell32.dll")] private static extern int SHGetKnownFolderPath(
        [MarshalAs(UnmanagedType.LPStruct)]Guid rfid, uint dwFlags, IntPtr hToken,
        out IntPtr ppszPath);

    [Flags] public enum KnownFolderFlags : uint { SimpleIDList = 0x00000100
        , NotParentRelative = 0x00000200, DefaultPath = 0x00000400, Init = 0x00000800
        , NoAlias = 0x00001000, DontUnexpand = 0x00002000, DontVerify = 0x00004000
        , Create = 0x00008000,NoAppcontainerRedirection = 0x00010000, AliasOnly = 0x80000000
    }
    public static string GetPath(string RegStrName, KnownFolderFlags flags, bool defaultUser) {
        IntPtr outPath;
        int result = 
            SHGetKnownFolderPath (
                new Guid(RegStrName), (uint)flags, new IntPtr(defaultUser ? -1 : 0), out outPath
            );
        if (result >= 0)            {
            return Marshal.PtrToStringUni(outPath);
        } else {
            throw new ExternalException("Unable to retrieve the known folder path. It may not "
                + "be available on this system.", result);
        }
    }

}   

To test it, if you specifically desire your personal download dir, you flag default to false -->

using System.IO;
class Program    {
    [STAThread]
    static void Main(string[] args)        {
        string path2Downloads = string.Empty;
        path2Downloads = 
            cGetEnvVars_WinExp.GetPath("{374DE290-123F-4565-9164-39C4925E467B}", cGetEnvVars_WinExp.KnownFolderFlags.DontVerify, false);
        string[] files = { "" };
        if (Directory.Exists(path2Downloads)) {
            files = Directory.GetFiles(path2Downloads);
        }
    }//Main
}

Or just one line Environment.ExpandEnvironmentVariables()--> (the simplest solution).

using System.IO;
class Program    {
/* https://ss64.com/nt/syntax-variables.html */
    [STAThread]
    static void Main(string[] args)        {
        string path2Downloads = string.Empty;
        string[] files = { "" };
        path2Downloads = Environment.ExpandEnvironmentVariables(@"%USERPROFILE%\Downloads");
        if (Directory.Exists(path2Downloads)) {
            files = Directory.GetFiles(path2Downloads);
        }
    }//Main
}

回答2:

Yes it is special, discovering the name of this folder didn't become possible until Vista. .NET still needs to support prior operating systems. You can pinvoke SHGetKnownFolderPath() to bypass this limitation, like this:

using System.Runtime.InteropServices;
...

public static string GetDownloadsPath() {
    if (Environment.OSVersion.Version.Major < 6) throw new NotSupportedException();
    IntPtr pathPtr = IntPtr.Zero;
    try {
        SHGetKnownFolderPath(ref FolderDownloads, 0, IntPtr.Zero, out pathPtr);
        return Marshal.PtrToStringUni(pathPtr);
    }
    finally {
        Marshal.FreeCoTaskMem(pathPtr);
    }
}

private static Guid FolderDownloads = new Guid("374DE290-123F-4565-9164-39C4925E467B");
[DllImport("shell32.dll", CharSet = CharSet.Auto)]
private static extern int SHGetKnownFolderPath(ref Guid id, int flags, IntPtr token, out IntPtr path);

回答3:

Try this:

string path = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile)+ @"\Downloads";

回答4:

I used the below code and it works for .net 4.6 with Windows 7 and above. The below code gives the user profile folder path -> "C:\Users\<username>"

string userProfileFolder = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);

Next to access the downloads folder just combine additional path strings as below:

string DownloadsFolder = userProfileFolder + "\\Downloads\\";

Now, the final result will be

"C:\Users\<username>\Downloads\"

Hope it saves time for someone in the future.

回答5:

try:

Dim Dd As String = Environment.GetFolderPath(Environment.SpecialFolder.Favorites)
Dim downloD As String = Dd.Replace("Favorites", "Downloads")
txt1.text = downLoD

its just a trick , not solution .

回答6:

For VB, try...

Dim strNewPath As String = IO.Path.GetDirectoryName(Environment.GetFolderPath(Environment.SpecialFolder.Desktop)) + "\Downloads\"

来源：https://stackoverflow.com/questions/3795023/how-to-programmatically-derive-windows-downloads-folder-userprofile-downloads