protected override void ApplySortCore(PropertyDescriptor prop,
ListSortDirection direction)
{
sortedList = new ArrayList();
// Check to see if the property type we are sorting by implements
// the IComparable interface.
Type interfaceType = prop.PropertyType.GetInterface("IComparable");
if (interfaceType != null)
{
// If so, set the SortPropertyValue and SortDirectionValue.
sortPropertyValue = prop;
sortDirectionValue = direction;
unsortedItems = new FilteredBindingList <T>();
if (sortPropertyValue != null)
{
// Loop through each item, adding it the the sortedItems ArrayList.
foreach (Object item in this.Items)
{
unsortedItems.Add((T)item);
sortedList.Add(prop.GetValue(item));
}
}
// Call Sort on the ArrayList.
sortedList.Sort();
T temp;
// Check the sort direction and then copy the sorted items
// back into the list.
if (direction == ListSortDirection.Descending)
{
sortedList.Reverse();
}
for (int i = 0; i < this.Count; i++)
{
int position = Find(prop.Name, sortedList[i]);
if (position != i && position > 0)
{
temp = this[i];
this[i] = this[position];
this[position] = temp;
}
}
isSortedValue = true;
// If the list does not have a filter applied,
// raise the ListChanged event so bound controls refresh their
// values. Pass -1 for the index since this is a Reset.
if (String.IsNullOrEmpty(Filter))
{
OnListChanged(new ListChangedEventArgs(ListChangedType.Reset, -1));
}
}
else
{
// If the property type does not implement IComparable, let the user
// know.
throw new InvalidOperationException("Cannot sort by "
+ prop.Name + ". This" + prop.PropertyType.ToString() +
" does not implement IComparable");
}
}
public Form1()
{
InitializeComponent();
this.button1.Click += new System.EventHandler(this.button1_Click);
this.button2.Click += new System.EventHandler(this.button2_Click);
businessObjects = new FilteredBindingList <Employee>();
businessObjects.Add(new Employee("Haas", "Jonathan", 35000, new DateTime(2005, 12, 12)));
businessObjects.Add(new Employee("Adams", "Ellen", 55000, new DateTime(2004, 1, 11)));
businessObjects.Add(new Employee("Hanif", "Kerim", 45000, new DateTime(2003, 12, 4)));
businessObjects.Add(new Employee("Akers", "Kim", 35600, new DateTime(2002, 12, 12)));
businessObjects.Add(new Employee("Harris", "Phyllis", 60000, new DateTime(2004, 10, 10)));
businessObjects.Add(new Employee("Andersen", "Elizabeth", 65000, new DateTime(2006, 4, 4)));
businessObjects.Add(new Employee("Alberts", "Amy", 35000, new DateTime(2007, 2, 1)));
businessObjects.Add(new Employee("Hamlin", "Jay", 38000, new DateTime(2004, 8, 8)));
businessObjects.Add(new Employee("Hee", "Gordon", 50000, new DateTime(2004, 10, 12)));
businessObjects.Add(new Employee("Penor", "Lori", 40000, new DateTime(2006, 12, 20)));
businessObjects.Add(new Employee("Pfeiffer", "Michael", 49000, new DateTime(2002, 1, 29)));
businessObjects.Add(new Employee("Perry", "Brian", 54000, new DateTime(2005, 9, 25)));
businessObjects.Add(new Employee("Pan", "Mingda", 56000, new DateTime(2004, 10, 17)));
businessObjects.Add(new Employee("Philips", "Carol", 65000, new DateTime(2005, 8, 14)));
businessObjects.Add(new Employee("Pica", "Guido", 52000, new DateTime(2006, 6, 23)));
businessObjects.Add(new Employee("Jean", "Virginie", 38000, new DateTime(2002, 5, 2)));
businessObjects.Add(new Employee("Reiter", "Tsvi", 39000, new DateTime(2003, 4, 12)));
bindingSource1.DataSource = businessObjects;
dataGridView1.DataSource = bindingSource1;
PropertyDescriptorCollection objectProps =
TypeDescriptor.GetProperties(businessObjects[0]);
BindingSource bindingSource2 = new BindingSource();
foreach (PropertyDescriptor prop in objectProps)
{
if (prop.PropertyType.GetInterface("IComparable", true) != null)
{
bindingSource2.Add(prop.Name);
}
}
comboBox1.DataSource = bindingSource2;
comboBox2.Items.AddRange(new string[] { "<", "=", ">" });
comboBox2.SelectedIndex = 0;
}