I'm adding at my ASPX page some controls dynamically. I need to add dynamically them, because the amount of controls depends on database record.
I'm using UpdatePanel and adding controls dynamically like that:
void AddFileUploadFields()
{
for (int i = 0; i < Helper.uploadFieldsCount; i++)
{
FileUpload fileUpload = new FileUpload();
string controlId = DateTime.Now.Ticks.ToString();
Thread.Sleep(10); // for non-equal ID for each control
fileUpload.ID = controlId;
uploadFormsId.Add(controlId);
UpdatePanel1.ContentTemplateContainer.Controls.Add(fileUpload);
PlaceHolder1.Controls.Add(fileUpload);
}
}
Then from the button, which was defined statically in asp-tag <asp:Button ... /> I'm trying to handle the file info, which I want to upload:
void buttonUpload_Click(object sender, EventArgs e)
{
var iEnum = uploadFormsId.GetEnumerator();
List<UploadFormDetails> uploadsInfo = new List<UploadFormDetails>();
List<string> generatedFileNames = new List<string>();
bool wereErrors = false;
while (iEnum.MoveNext())
{
FileUpload uploadForm = (FileUpload)FindControl(iEnum.Current.ToString());
uploadsInfo.Add(new UploadFormDetails(uploadForm.ID, uploadForm.HasFile, uploadForm.FileName));
}
...
}
The main problem does occur here:
FileUpload uploadForm = (FileUpload)FindControl(iEnum.Current.ToString());
When I'm getting control like that, all options of it, like .HasFile or .FileName are unavailable to see. It just looks like a new control with no saved options. Of course, I'm selecting some file for the test, please don't think that I'm trying to upload from empty form.
How could i fix it? I can't upload any file...
I found a solution, but the result I've got is designed in other way, which doesn't use Server controls of ASP.NET, I handled the plain HTML elements.
In ASPX page, I defined:
<%
for (int i = 0; i < Helper.uploadFieldsCount; i++)
{
Response.Write("<input type='file' id='uploadField" + i.ToString() + "' name='uploadField" + i.ToString() + "' class='file_1' /><br />");
}
%>
runat was defined in the main form of the page, in the beginning:
<body>
<form enctype="multipart/form-data" id="form1" runat="server">
...
In the CodeBehind I'm uploading a new file with randomly generated name based on GUID:
void buttonUpload_Click(object sender, EventArgs e)
{
List<string> generatedFileNames = new List<string>();
bool wereErrors = false;
for (int i = 0; i < Helper.uploadFieldsCount; i++)
{
HttpPostedFile filePosted = Request.Files["uploadField" + i.ToString()];
if (filePosted != null && filePosted.ContentLength > 0)
{
string fileNameApplication = System.IO.Path.GetFileName(filePosted.FileName);
string fileExtensionApplication = System.IO.Path.GetExtension(fileNameApplication);
string newFile = Guid.NewGuid().ToString() + fileExtensionApplication;
string filePath = System.IO.Path.Combine(Server.MapPath("uploads"), newFile);
if (fileNameApplication != String.Empty)
{
generatedFileNames.Add(newFile);
filePosted.SaveAs(filePath);
}
}
...