如何在主文件夹中使用用户的用户 ID 创建子文件夹？

Question

I am currently one issue - which is to create a sub folder (which is named after each user's ID name). Following is what I had tried.

protected void Button1_Click(object sender, EventArgs e)
{
    string filepath = Path.GetExtension(FileUpload1.FileName);

    if (filepath.ToLower() != ".pdf" && 
        filepath.ToLower() != ".png" && 
        filepath.ToLower() != ".gif" &&
        filepath.ToLower() != ".zip")
    {
        lblmessage.Text = "Only pdf, png and gif file are accepted";
    }
    else
    {
        if (FileUpload1.PostedFile.ContentLength > 5000000)
        {
            lblmessage.Text = "Maximum size (5MB) exceeded";
        }
    }

    foreach (HttpPostedFile postedfile in FileUpload1.PostedFiles)
    {
        if (!Directory.Exists(filepath))
        {
            Directory.CreateDirectory(filepath);
        }

        string filename = Path.GetFileName(postedfile.FileName);
        postedfile.SaveAs(Server.MapPath("Courses/FAID_CSP/ADMIN_NO/" + filename));
    }

    lblmessage.Text = string.Format("{0} Selected Files Are Submitted into DB", 
        FileUpload1.PostedFiles.Count);
}

}

Answer 1

Hi try the code below:

.......
//Get the admin number from somewhere.
int userId = GetAdminNo();
string subDir = $"Courses/FAID_CSP/{userId}/";
if (!Directory.Exists(subDir))
{
    Directory.CreateDirectory(subDir);
}

string filename = Path.GetFileName(postedfile.FileName);
postedfile.SaveAs(Server.MapPath(subDir + filename));
......

Answer 2

I think what you're trying to do is this:

foreach (HttpPostedFile postedfile in FileUpload1.PostedFiles)
{
    string USER_ID = ????
    string userPath = Server.MapPath("Courses/FAID_CSP/ADMIN_NO/") + USER_ID;
    if (!Directory.Exists(userPath))
    {
        Directory.CreateDirectory(userPath);
    }
    string filename = Path.GetFileName(postedfile.FileName);
    postedfile.SaveAs(Path.Combine(userPath, filename));
}

You have to provide a way to set USER_ID since you currently don't have that in your code.