Question

Trying to sort a arraylist by Objects name

Dim ObjList as new arraylist
Dim TextBox1 as new textbox
Textbox1.name = "CCC"
Dim TextBox2 as new textbox
Textbox1.name = "AAA"
Dim TextBox3 as new textbox
Textbox1.name = "BBB"
ObjList.add(TextBox1)
ObjList.add(TextBox2)
ObjList.add(TextBox3)
ObjList.sort()

Sort creates a error. How would I sort the TextBoxs by Name so it looks like
AAA
BBB
CCC

Thank you

Answer 1

You have to create an IComparer and pass it to the Sort method:

Class TextBoxComparer 
    Implements IComparer

    Public Function Compare(x As Object, y As Object) As Integer Implements IComparer.Compare
        Return String.Compare(x.Name, y.Name)
    End Function

End Class

...

ObjList.Sort(New TextBoxComparer())

---

Or, if you can switch to List(Of TextBox), an anonymous function (that matches the Comparison(Of T) delegate) will also do:

Dim ObjList As New List(Of TextBox)

...

ObjList.Sort(Function(x, y) String.Compare(x.Name, y.Name))