Sort an array of structures in .NET

Question

This is one of those times when only the hive mind can help - no amount of Google-fu can!

I have an array of structures:

Structure stCar 
    Dim Nam         


        

Answer 1

Another possibility, that doesn't use Linq but instead uses the .Net Array class' Sort method:

Module Module1
    Structure stCar
        Dim Name As String
        Dim MPH As String

        Sub New(ByVal _Name As String, ByVal _MPH As Integer)
            Name = _Name
            MPH = _MPH
        End Sub
    End Structure

    Class CarCompareMph : Implements IComparer

        Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer Implements System.Collections.IComparer.Compare
            Dim xCar As stCar = DirectCast(x, stCar)
            Dim yCar As stCar = DirectCast(y, stCar)
            Return New CaseInsensitiveComparer().Compare(xCar.MPH, yCar.MPH)
        End Function
    End Class

    Sub Main()
        Dim cars() As stCar = {New stCar("honda", 50), New stCar("ford", 10)}
        Array.Sort(cars, New CarCompareMph)

        For Each c As stCar In cars
            Console.WriteLine("{0} - {1} MPH", c.Name, c.MPH)
        Next
    End Sub

End Module

I'm not sure if that's what you're looking for, but it's another approach.

Answer 2

In VB.Net of VS2015 there is another method of sorting:

cars.Sort(New Comparison(Of stCar)(Function(x, y) 'x and y are of type of stCar
                                                             If x.MPH > y.MPH Then
                                                                 Return 1 ' Return Value>0 means x>y
                                                             End If
                                                             If x.MPH < y.MPH Then
                                                                 Return -1 ' Return Value<0 means x<y
                                                             End If
                                                             If x.MPH = y.MPH Then
                                                                 Return 0 ' Return Value=0 means x=y
                                                             End If
                                                         End Function))

Answer 3

I don't know VB.NET, but you should be able to do this my implimenting IComparer. Take a look at this example

http://www.java2s.com/Code/VB/Data-Structure/UseIComparertosortbydifferentproperties.htm

Alternativly you can also use Linq

Answer 4

The easiest way to perform the sort would be to use LINQ to Objects.

Dim q = From c In cars Order By c.MPH Select c

Answer 5

Assuming that the structure has a property called MPH:

cars = cars.OrderBy(Function(c) c.MPH)

Note: the above code was auto-converted from the following c# code (in case it contains errors):

cars = cars.OrderBy(c => c.MPH);

Answer 6

A simple way that seems to be working for me in vb.net 2013 is as follows:

cars.Sort(Function(c1,c2) c1.MPH.CompareTo(c2.MPH))