/// <summary>
/// Saves the uploaded file.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void addFile_Click(object sender, EventArgs e)
{
if (this.FreeFileDataSlotExists())
{
bool FileSaveRequestIsValid = this.ValidFileSaveRequest();
if (this.fileBrowserBox.PostedFile != null && this.fileBrowserBox.PostedFile.ContentLength > 0 && FileSaveRequestIsValid)
{
// Get the user requesting the delete operation
AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
string modifiedBy = System.Threading.Thread.CurrentPrincipal.Identity.Name;
// Read the file details and data into a file object
string fileDescription = null;
if (this.fileDescriptionBox != null)
{
fileDescription = this.fileDescriptionBox.Text;
}
DatabaseFileData fileData = new DatabaseFileData(this.fileBrowserBox.PostedFile, fileDescription);
// Store the file in the database.
int recordId = this.SaveFileInDB(fileData, modifiedBy);
if (recordId > 0)
{
// We now need to store this new id and the filename in the file data arrays.
this.AddFileDataToArrays(recordId, fileData.FileOriginalName);
}
}
}
}
/// <summary>
/// Raises the <see cref="E:System.Web.UI.Control.PreRender"/> event.
/// </summary>
/// <param name="e">An <see cref="T:System.EventArgs"/> object that contains the event data.</param>
protected override void OnPreRender(EventArgs e)
{
// In postbacks, the controls are updated from the viewstate at this point.
// Cycle through each file id in the field data array. If a file id exists then show the file details on screen.
for (int index = 0; index < maxFiles; index++)
{
HtmlInputHidden idBox = this.fileIdArray[index];
HtmlInputHidden nameBox = this.fileNameArray[index];
HtmlGenericControl spanFilename = this.spanFilenameArray[index];
HtmlGenericControl divFile = this.divFileArray[index];
if (!string.IsNullOrEmpty(idBox.Value))
{
int FileDataID = Convert.ToInt32(idBox.Value);
// Get just the file details without the attachment body
DatabaseFileData fileData = GetFileFromDB(FileDataID, false);
// Create a file link control
FileLinkControl fileLink = new FileLinkControl();
// Feed it a file handler url, but manually override the file extension detail
switch (this.attachmentType)
{
case MultiFileAttachmentType.Document:
fileLink.NavigateUrl = GetFileAttachmentUrl(FileDataID, this.dotnetProjectName);
break;
case MultiFileAttachmentType.Image:
fileLink.NavigateUrl = GetImageUrl(FileDataID, this.dotnetProjectName);
break;
}
fileLink.FileExtension = System.IO.Path.GetExtension(fileData.FileOriginalName);
fileLink.FileSize = fileData.FileSize;
// Note: the filename in hidden storage (nameBox.Value) and the filename extracted from the database will be the same (fileData.FileOriginalName).
fileLink.InnerText = nameBox.Value;
// Now add the file link control
spanFilename.Controls.Add(fileLink);
}
// Show or hide the file display
divFile.Visible = !string.IsNullOrEmpty(idBox.Value);
}
base.OnPreRender(e);
}
/// <summary>
/// Enables processing of HTTP Web requests by a custom HttpHandler that implements the <see cref="T:System.Web.IHttpHandler"/> interface.
/// </summary>
/// <param name="context">An <see cref="T:System.Web.HttpContext"/> object that provides references to the intrinsic server objects (for example, Request, Response, Session, and Server) used to service HTTP requests.</param>
public void ProcessRequest(HttpContext context)
{
this.Context = context;
int fileDataID = this.FileDataID;
if (fileDataID > 0)
{
// We have a file we need to retrieve from the database
DatabaseFileData fileData = GetFileAttachment(fileDataID, true);
// Tell the response object the real name for the file
this.Context.Response.AddHeader("Content-Disposition", "attachment;filename=" + fileData.FileOriginalName);
// Tell the response object the content type for the file
this.Context.Response.ContentType = fileData.FileContentType;
// Now write the file's binary data out to the response object
this.Context.Response.BinaryWrite(fileData.FileBLOBData);
}
}
/// <summary> /// Saves the uploaded file to the database /// </summary> /// <param name="fileData"></param> /// <param name="modifiedBy"></param> /// <returns>The record id for the stored file</returns> /// <remarks>This has to be abstract to enable this control to be generic.</remarks> protected abstract int SaveFileInDB(DatabaseFileData fileData, string modifiedBy);
