SourceControl Problem (Dynamic SplitButton with ContextMenu) - Bug? #901

consystems asked 2017-06-16 09:44:25 UTC

Hello

I got a problem with the “FileUpload” and dynamic “SplitButton” control which were added at runtime to a form.
Just to clarify what I’m trying to achieve. I got a form which is slightly similar to an email application. So I want to add attachments to those mails. I use the “FileUpload” to get those attachments and let them be shown in an “FlowLayoutPanel” as “SplitButton” with an “ContextMenu” that provides the options “print, save and remove”. As I said, those “SplitButton” where added to the Panel dynamically in the “UploadedEvent” of the “FileUpload”.

Dictionary<string, byte[]> _byteArrayList = new Dictionary<string, byte[]>();
private void fuAttachements_Uploaded(object sender, UploadedEventArgs e)
{

string x = string.Empty;
System.Web.HttpFileCollection d = e.Files;

for(int i = 0; i < e.Files.Count; i++)
{

System.Web.HttpPostedFile file = (System.Web.HttpPostedFile)e.Files[i];

byte[] fileData = null;
bool optischHinzufuegen = false;
using (var binaryReader = new System.IO.BinaryReader(e.Files[i].InputStream))
{

fileData = binaryReader.ReadBytes(e.Files[i].ContentLength);
if (!_byteArrayList.ContainsKey(e.Files[i].FileName))
{
_byteArrayList.Add(e.Files[i].FileName, fileData);
optischHinzufuegen = true;
}

}

if (optischHinzufuegen)
{

// Create the MenuItems for the ContextMenu
Wisej.Web.MenuItem miPrint = new MenuItem("Drucken", miPrint_Click);
miPrint.Name = "miPrint_" + file.FileName;
Wisej.Web.MenuItem miSave = new MenuItem("Speichern", miSave_Click);
miPrint.Name = "miSave" + file.FileName;
Wisej.Web.MenuItem miDelete = new MenuItem("Entfernen", miDelete_Click);
miPrint.Name = "miDelete" + file.FileName;

//Wisej.Web.ContextMenu conMenu = new ContextMenu();
//conMenu.MenuItems.Add(miPrint);
//conMenu.MenuItems.Add(miSave);
//conMenu.MenuItems.Add(miDelete);

Wisej.Web.SplitButton sbtn = new Wisej.Web.SplitButton {
Text = file.FileName,
Width = 100,
Height = 50 };

sbtn.Name = file.FileName;

sbtn.MenuItems.Add(miPrint);
sbtn.MenuItems.Add(miSave);
sbtn.MenuItems.Add(miDelete);

flpAttatchments.Controls.Add(sbtn); //FlowLayoutPanel

}

}

}

private void miDelete_Click(object sender, EventArgs e)
{

Wisej.Web.MenuItem mi = (Wisej.Web.MenuItem)sender;
Wisej.Web.ContextMenu m = (Wisej.Web.ContextMenu)mi.Parent;
Wisej.Web.SplitButton spbtn = (Wisej.Web.SplitButton)m.SourceControl;

if (spbtn != null)
{
_byteArrayList.Remove(spbtn.Text);
flpAttatchments.Controls.Remove(spbtn);
}

}

My problem now is, that in 95% of all cases that I got expected access to the “SplitButton” in the “miDelete_Click” event. But in some cases the “SourceControl” property returns “null”. I can’t find why this happens or what it causes that the “SourceControl” property isn’t set to the “SplitButton”.
Maybe the way how I create the “SplitButton” isn’t correct or shall be done in another way?