如何编程派生Windows下载文件夹“％userProfile％/下载”？

Question

在.NET中，我们可以将通往“特殊文件夹”的路径（例如文档/桌面等）进行，今天我试图找到一种方法来获取“下载”文件夹的路径，但似乎还不够特殊。

我知道我可以做'c： users username downloads'，但这似乎是一个丑陋的解决方案。那么如何使用.NET重新读取路径呢？

Answer 1

您的第一个答案的问题是，如果默认下载DIR已更改为[下载1]，它将给您错误的结果！涵盖所有可能性的正确方法是

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);
        }
    }

}   

要测试它，如果您特别希望自己的个人下载dir，则标记为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
}

或仅一条线环境。

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
}

Answer 2

是的，这很特别，直到Vista，发现此文件夹的名称才变得不可能。 .NET仍然需要支持先前的操作系统。您可以将ShgetnownFolderPath（）固定在此限制中，这样：

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);

Answer 3

尝试这个：

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

Answer 4

我使用以下代码，它适用于Windows 7及更高版本的.NET 4.6。以下代码给出了用户配置文件夹路径 - > "C:\Users\<username>"

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

接下来访问下载文件夹只需将其他路径字符串组合如下：

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

现在，最终结果将是

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

希望它能在将来节省某人的时间。

Answer 5

尝试：

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

这只是一个技巧，而不是解决方案。

Answer 6

对于VB，请尝试...

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