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I have a Tlist that contains addresses. When I sort the list, numbers in the address are considered a string, and it doesn't sort correctly. How should I sort the list ascending? 

 Dim sortme As List(Of data) = tempdata 'main list containing addresses as strings.
     sortme.Sort(Function(p1 As data, p2 As data) numorder(p1.Value).CompareTo(numorder(p2.Value)))

       Private Function numorder(ByVal str As String)
        Try
            Dim words() As String = str.Split(" "c) 'read string up to first space (for number)
            Return Convert.ToInt32(words(0))
        Catch ex As Exception
        End Try
    End Function

Example of current output:

1001 street name

103 street name

1021 street name

It should be:

103 street name

1001 street name

1021 street name
4

1 回答 1

1

这个想法是编写你自己的比较器，它将首先考虑数字前缀，然后是字符串本身。然后可以在任何地方使用此比较器，例如在 LINQ 中OrderBy()。这里有一个 c# 示例，请参阅下面的完整 VB.NET 版本。

   public class StreetComparer : IComparer<string>
    {
        public int Compare(string x, string y)
        {
            int indexOfSpaceX = x.IndexOf(' ');
            string numericalPartX = x.Substring(0, indexOfSpaceX);

            int indexOfSpaceY = y.IndexOf(' ');
            string numericalPartY = y.Substring(0, indexOfSpaceY);

            int numberX;
            int numberY;

            if(!int.TryParse(numericalPartX, out numberX) ||
                !int.TryParse(numericalPartY, out numberY))
            {
                //Some code to handle the case where number is missing
                throw new ArgumentException();
            }

            if (numberX!=numberY)
            {
                return numberX-numberY;
            }

            string textPartX = x.Substring(indexOfSpaceX + 1);
            string textPartY = x.Substring(indexOfSpaceY + 1);

            return String.Compare(textPartX, textPartY, true, CultureInfo.CurrentCulture);

        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            var myStreets = new[] {"01 aaa", "02 bbb"};

            var result = myStreets.OrderBy(s => s, new StreetComparer());
        }
    }

现在，一个 VB.NET 版本完全适合您的用例，其中包含按属性排序的类的列表：

Public Class StreetComparer
    Implements IComparer(Of String)
    Public Function Compare(x As String, y As String) As Integer
        Dim indexOfSpaceX As Integer = x.IndexOf(" "C)
        Dim numericalPartX As String = x.Substring(0, indexOfSpaceX)

        Dim indexOfSpaceY As Integer = y.IndexOf(" "C)
        Dim numericalPartY As String = y.Substring(0, indexOfSpaceY)

        Dim numberX As Integer
        Dim numberY As Integer

        If Not Integer.TryParse(numericalPartX, numberX) OrElse Not Integer.TryParse(numericalPartY, numberY) Then
            'Some code to handle the case where number is missing
            Throw New ArgumentException()
        End If

        If numberX <> numberY Then
            Return numberX - numberY
        End If

        Dim textPartX As String = x.Substring(indexOfSpaceX + 1)
        Dim textPartY As String = x.Substring(indexOfSpaceY + 1)

        Return [String].Compare(textPartX, textPartY, True, CultureInfo.CurrentCulture)

    End Function
End Class

Public Class Person
    Public Property Value() As String
        Get
            Return m_Value
        End Get
        Set
            m_Value = Value
        End Set
    End Property
    Private m_Value As String

    Public Sub New(value__1 As String)
        Value = value__1
    End Sub
End Class

Class Program
    Private Shared Sub Main(args As String())
        Dim sortme As New List(Of Person)(New () {New Person("1001 street name"), New Person("103 street name"), New Person("1021 street name")})

        Dim result = sortme.OrderBy(Function(p) p.Value, New StreetComparer())

        For Each person As var In result
            Console.WriteLine(person.Value)
        Next
        Console.ReadKey()
    End Sub
End Class
于 2012-12-03T21:23:00.780 回答