C# Can I add values to a listbox with a backgroundwork thread

backgroundworkerc

I want my background worker to add items to a list box, it appears to do so when debugging but the listbox doesn't show the values. I suspect this is something to do with adding items whilst inside the background worker thread, do I need to add these to an array and then populate the list box from the array during backgroundWorker1_RunWorkerCompleted?

Thanks for the help.

Best Answer

You can use Invoke like this:

private void AddToListBox(object oo)
{
    Invoke(new MethodInvoker(
                   delegate { listBox.Items.Add(oo); }
                   ));
}

Related Solutions

C# – How to cast int to enum

From an int:

YourEnum foo = (YourEnum)yourInt;

From a string:

YourEnum foo = (YourEnum) Enum.Parse(typeof(YourEnum), yourString);

// The foo.ToString().Contains(",") check is necessary for enumerations marked with an [Flags] attribute
if (!Enum.IsDefined(typeof(YourEnum), foo) && !foo.ToString().Contains(","))
{
    throw new InvalidOperationException($"{yourString} is not an underlying value of the YourEnum enumeration.")
}

Update:

From number you can also

YourEnum foo = (YourEnum)Enum.ToObject(typeof(YourEnum) , yourInt);

C# – How to add an additional item to a WPF ListBox using ItemSource

Use CompositeCollection to merge your collection, with another collection containing your specialized item. Then, use a strongly typed datatemplate for your special select all option that does what you want in that section.

Other options include disabling scrolling in the list view, placing the listview inside a stackpanel, along with your select all, and then placing that stack panel in a scrollviewer, or just putting a button in the UI :)

Best Answer

Related Solutions

C# – How to cast int to enum

C# – How to add an additional item to a WPF ListBox using ItemSource

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