The code block below results in the error: TargetParameterCountException was unhandled by user code. Parameter count mismatch.
public void AddListViewItem(string[] Data)
{
if (InvokeRequired)
{
Invoke(new Action<string[]>(AddListViewItem), Data);
}
else
{
ListViewData.Items.Add(Data[0]).SubItems.AddRange
(
new string[]
{
Data[1],
Data[2],
Data[3],
}
);
}
}
Any ideas?
The error occurs because of array covariance; an array of strings is assignable to object[]
. This causes the Invoke
method to treat each element of the string
array as if it should be an argument to the AddListViewItem
method.
Here's a fix:
Invoke(new Action<string[]>(AddListViewItem), new object[] {Data});
(or)
Invoke(new Action<string[]>(AddListViewItem), (object)Data);
This makes it crystal-clear to Invoke
that the target method takes a single parameter.