public class FileUpload {
private static string _fileType = ".zip|.rar|.txt";
private static string _uploadPath = "UploadFiles/";
private static int _maxFilesQuantity = 10;
public static string FileType {
get { return _fileType; }
set { _fileType = value; }
}
public static string UploadPath {
get { return _uploadPath + DateTime.Now.ToString("yyyy_MM") + "/"; }
set { _uploadPath = value; }
}
public static int MaxFilesQuantity {
get { return _maxFilesQuantity; }
set { _maxFilesQuantity = value; }
}
/// <summary>
/// Upload
/// </summary>
/// <param name="grade">CategoryId</param>
/// <param name="gradeid">ItemId</param>
public static void Save(int grade, int gradeid) {
HttpFileCollection files = HttpContext.Current.Request.Files;
if (files.Count > 0 && files.Count <= _maxFilesQuantity) {
for (int i = 0; i < files.Count; i++) {
HttpPostedFile file = files;
if (file.ContentLength > 0) {
string fileName = GenerateFileName(System.IO.Path.GetFileName(file.FileName));
string uploadPath = UploadPath;
string filePath = HttpContext.Current.Server.MapPath("/"+uploadPath);
if (CheckExtensionName(fileName)) {
if (!System.IO.Directory.Exists(filePath)) System.IO.Directory.CreateDirectory(filePath);
file.SaveAs(filePath + fileName);
// Save to DB
string id = files.AllKeys.Substring(5);
AttachmentInfo item = new AttachmentInfo();
item.Description = HttpContext.Current.Request.Form["filedesc_" + id].Trim();
item.Url = uploadPath + fileName;
item.Grade = grade;
item.GradeID = gradeid;
new AttachmentBLL().CreateAttachment(item);
}
}
}
}
}
/// <summary>
/// Check the file's extension is valid or not.
/// </summary>
private static bool CheckExtensionName(string fileName) {
if (FileType == ".*") return true;
if (FileType.IndexOf(System.IO.Path.GetExtension(fileName)) == -1)
return false;
else
return true;
}
/// <summary>
/// Generate a new filename from the old filename.
/// </summary>
private static string GenerateFileName(string fileName) {
StringBuilder sb = new StringBuilder();
sb.Append(new Random().Next(100, 999).ToString());
sb.Append("_");
sb.Append(DateTime.Now.ToString("HHmmss"));
sb.Append("_");
sb.Append(fileName);
return sb.ToString();
}
}