I do not really like "out" keyword, so what about of using a class (Row) that contains information:
using SCG = System.Collections.Generic;
using System.Linq;
public class Row {
public int CheckedType { get; set; }
public int CheckedFile { get; set; }
}
...
public delegate SCG.IEnumerable<Row> GetAllCheckedItemsDelegate();
public bool GetAllCheckedItems() {
if (ListView.InvokeRequired) {
var rows = ListView.Invoke(new GetAllCheckedItemsDelegate(GetAllCheckedItems)
, new object[] {});
return rows.Count() > 0;
} else {
var rows = new SCG.List<Row>();
for (int i = 0; i < ListView.CheckedItems.Count; i++) {
// create and set row
var row = new Row { CheckedType = x, CheckedFile = y };
...
rows.Add(row);
}
return rows.AsReadOnly();
}
}