I have 3 columns in my ListView: name, string value and int value.
Name:Item1, Item2, Item3
string value:A, B, A
int value:3,2,1
I want to sort my ListView first, by string value. Like this:
Name:Item1, Item3, Item2
string value:A, A, B
int value:3,1,2
After that I want to sort by int value. Like this:
Name:Item3, Item1, Item2
string value:A, A, B
int value:1,3,2
To do this should I use List<> or is there any way?
If I should use List<> what is the proper way to the it?
You can use a custom ListViewItemSorter to sort the columns of a ListView control.
This is an custom overloaded IComparer that lets you specify 1 or 2 columns for sorting, with the option to pass no parameters for a default Column[0] order.
Specify a sort order:
listView1.Sorting = SortOrder.Ascending;
...and the Indexes of the Columns you want to compare. The order in which you enter them is of course important. In you example you should enter:
listView1.ListViewItemSorter = new ListViewItemComparer(1, 2);
The Default sorting Column[0] can be set like this:
listView1.ListViewItemSorter = new ListViewItemComparer();
The ListViewItemComparer Class:
class ListViewItemComparer : IComparer
{
private int col1 = -1;
private int col2 = -1;
public ListViewItemComparer() => col1 = 0;
public ListViewItemComparer(int Column) => col1 = Column;
public ListViewItemComparer(int Column1, int Column2)
{
col1 = Column1;
col2 = Column2;
}
public int Compare(object x, object y)
{
int result = string.Compare(((ListViewItem)x).SubItems[col1].Text,
((ListViewItem)y).SubItems[col1].Text);
if (!(col2 < 0))
result |= string.Compare(((ListViewItem)x).SubItems[col2].Text,
((ListViewItem)y).SubItems[col2].Text);
return result;
}
}
Use LINQ OrderBy and ThenBy to sort the letter(string) and number (int) properties:
List<myClass> myList = new List<myClass>()
{
new myClass(){name="Item1",letter="A", number=3 },
new myClass(){name="Item2",letter="B", number=2 },
new myClass(){name="Item3",letter="A", number=1 }
};
var result = myList.OrderBy(x => x.letter).ThenBy(x => x.number).ToList();
result:
name:Item3, Item1, Item2
letter:A, A, B
number:1,3,2
Add items from the list result to ListView:
listView1.View = View.Details;
listView1.Columns.Add("name");
listView1.Columns.Add("letter");
listView1.Columns.Add("number");
foreach (var item in result)
{
listView1.Items.Add(new ListViewItem(new string[] { item.name,item.letter,item.number.ToString()}));
}
myClass:
class myClass
{
public string name { get; set; }
public string letter { get; set; }
public int number { get; set; }
}
Assuming IEnumerable<T> like a List<T>
List<T> sortedList = list.OrderBy(x => x.Col1).ThenBy(x => x.Col2).ThenBy(x => x.Col3).ToList();
