listview排序的问题

[cononlove]

private void listView1_ColumnClick(object sender, ColumnClickEventArgs e)
{
ColumnSort columnsort = new ColumnSort(e.Column);
columnsort.bAscending = (listView1.Sorting == SortOrder.Ascending);
if (columnsort.bAscending)
{
listView1.Sorting = SortOrder.Descending;
}
else
{
listView1.Sorting = SortOrder.Ascending;
}
listView1.ListViewItemSorter = columnsort;
}
public class ColumnSort : IComparer
{
private int columnNum = 0;
public bool bAscending = true;
public ColumnSort(int column_to_sort)
{
columnNum = column_to_sort;
}

public int Compare(object a, object b)
{
System.Windows.Forms.ListViewItem
listItemA = (System.Windows.Forms.ListViewItem)a;
System.Windows.Forms.ListViewItem
listItemB = (System.Windows.Forms.ListViewItem)b;
if (bAscending)
{
return String.Compare(listItemA.SubItems[columnNum].ToString(), listItemB.SubItems[columnNum].ToString());
}
else
{
return -1 * String.Compare(listItemA.SubItems[columnNum].ToString(), listItemB.SubItems[columnNum].ToString());
}
}
}

这段代码是百度搜到的关于listview排序的，但是我不太懂这段代码，而且发现在程序运行中经常出现bug，敬请高手指教！

[cononlove]

这个除了能生成10列外，没法排序啊？ 能帮我解释下Compare（object x, object Y）这个函数吗，它返回的那个表达式是...？
谢谢！
[Quote=引用 8 楼 wzuomin 的回复:]
刚才自动转换的C#代码有问题，不能运行。
下面这个是可以运行的


C# code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication2
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent(…
[/Quote]

[wzuomin]

[Quote=引用 9 楼 cononlove 的回复:]
这个除了能生成10列外，没法排序啊？ 能帮我解释下Compare（object x, object Y）这个函数吗，它返回的那个表达式是...？
谢谢！
引用 8 楼 wzuomin 的回复:
刚才自动转换的C#代码有问题，不能运行。
下面这个是可以运行的


C# code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Window…
[/Quote]


用鼠标点击第一列可以排序的呀。

[wzuomin]

没反应？lz是不是没有绑定 ListView_ColumnClick 事件啊？

[wzuomin]

这是完整测试代码如下

Public Class Form1

    Private sort As SortOrder = SortOrder.Ascending

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim ListView1 As New ListView
        AddHandler ListView1.ColumnClick, AddressOf ListView_ColumnClick
        ListView1.View = View.Details
        ListView1.Dock = DockStyle.Fill
        ListView1.Columns.Add("Column1")
        ListView1.Columns.Add("Column2")

        Dim rnd As New Random
        For i As Integer = 0 To 100
            Dim item As New ListViewItem(rnd.Next.ToString)
            item.SubItems.Add("TestItem" + i.ToString)
            ListView1.Items.Add(item)
        Next
        Me.Controls.Add(ListView1)
    End Sub

    Private Sub ListView_ColumnClick(ByVal sender As Object, ByVal e As System.Windows.Forms.ColumnClickEventArgs)
        If sort = SortOrder.Ascending Then
            CType(sender, ListView).ListViewItemSorter = New ListViewItemComparer(e.Column, SortOrder.Ascending)
            sort = SortOrder.Descending
        Else
            CType(sender, ListView).ListViewItemSorter = New ListViewItemComparer(e.Column, SortOrder.Descending)
            sort = SortOrder.Ascending
        End If

        CType(sender, ListView).Sort()
    End Sub

    Class ListViewItemComparer
        Implements IComparer

        Private col As Integer
        Public sortOrder As SortOrder = SortOrder.Ascending

        Public Sub New()
            col = 0
        End Sub

        Public Sub New(ByVal column As Integer, ByVal sort As SortOrder)
            col = column
            sortOrder = sort
        End Sub

        Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer Implements IComparer.Compare
            If sortOrder = Windows.Forms.SortOrder.Ascending Then
                Return [String].Compare(CType(x, ListViewItem).SubItems(col).Text, CType(y, ListViewItem).SubItems(col).Text)
            ElseIf sortOrder = Windows.Forms.SortOrder.Descending Then
                Return -1 * [String].Compare(CType(x, ListViewItem).SubItems(col).Text, CType(y, ListViewItem).SubItems(col).Text)
            Else
                Return 0
            End If
        End Function
    End Class

End Class

[wzuomin]

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication2
{
    public partial class Form1 : Form
    {
            private SortOrder sort = SortOrder.Ascending;

        public Form1()
        {
            InitializeComponent();
        }

            private void Form1_Load(object sender, System.EventArgs e)
            {
                ListView ListView1 = new ListView();
                ListView1.ColumnClick += ListView_ColumnClick;
                ListView1.View = View.Details;
                ListView1.Dock = DockStyle.Fill;
                ListView1.Columns.Add("Column1");
                ListView1.Columns.Add("Column2");
                             
                for (int i = 0; i <= 100; i++)
                {
                    ListViewItem item = new ListViewItem("Item"+i.ToString ());
                    item.SubItems.Add("TestItem" + i.ToString());
                    ListView1.Items.Add(item);
                }
                this.Controls.Add(ListView1);
            }

            private void ListView_ColumnClick(object sender, System.Windows.Forms.ColumnClickEventArgs e)
            {
                if (sort == SortOrder.Ascending)
                {
                    ((ListView)sender).ListViewItemSorter = new ListViewItemComparer(e.Column, SortOrder.Ascending);
                    sort = SortOrder.Descending;
                }
                else
                {
                    ((ListView)sender).ListViewItemSorter = new ListViewItemComparer(e.Column, SortOrder.Descending);
                    sort = SortOrder.Ascending;
                }

                ((ListView)sender).Sort();
            }

        public class ListViewItemComparer : System.Collections.IComparer
            {

                private int col;
                public SortOrder sortOrder = SortOrder.Ascending;

                public ListViewItemComparer()
                {
                    col = 0;
                }

                public ListViewItemComparer(int column, SortOrder sort)
                {
                    col = column;
                    sortOrder = sort;
                }

                public int Compare(object x, object y)
                {
                    if (sortOrder == System.Windows.Forms.SortOrder.Ascending)
                    {
                        return String.Compare(((ListViewItem)x).SubItems[col].Text, ((ListViewItem)y).SubItems[col].Text);
                    }
                    else if (sortOrder == System.Windows.Forms.SortOrder.Descending)
                    {
                        return -1 * String.Compare(((ListViewItem)x).SubItems[col].Text, ((ListViewItem)y).SubItems[col].Text);
                    }
                    else
                    {
                        return 0;
                    }
                }
            }

        } 
    }

这样再点击列标题看看是不是排序改变了呢？

[cononlove]

ListView_ColumnClick是不是改写成listView1_ColumnClick啊？
要不然提示有错啊...

[xiaoqiuwyh]

根据你自己的程序中实际的名称来写,参数名index指的是一个索引值,也就是下标.

[cononlove]

多谢wzuomin
已经实现了排序，但是还有个小问题，就是排序时是按照逐个字符去比较大小的，比如说1，11，12，2，22，3，4，5 这几个数是这样排列的
1
11
12
2
22
3
4
5

如果我想按照
1
2
3
4
5
11
12
22
来排列该怎么做呢？
再次感谢！

[wzuomin]

[Quote=引用 16 楼 cononlove 的回复:]
多谢wzuomin
已经实现了排序，但是还有个小问题，就是排序时是按照逐个字符去比较大小的，比如说1，11，12，2，22，3，4，5 这几个数是这样排列的
1
11
12
2
22
3
4
5

如果我想按照
1
2
3
4
5
11
12
22
来排列该怎么做呢？
再次感谢！
[/Quote]

修改 Compare 中的两者比较方法即可。

[net0003]

这么多贴，问你下，你要根据什么排序，第一列，第二列，还是什么，说明白了就好做了

[cononlove]

[Quote=引用 1 楼 net0003 的回复:]
就是当你点击哪一列的时候 就根据这列进行排序...


这么多贴，问你下，你要根据什么排序，第一列，第二列，还是什么，说明白了就好做了
[/Quote]

[net0003]

我有个笨方法

获得列号，也就是SubItems[i]的i的值，在用for循环CompareTo SubItems[i] 和SubItems[i+1]应该就行了

[wzuomin]

我有段代码是这么用的，lz可以试试看。

Private Sub ListView_ColumnClick(ByVal sender As Object, ByVal e As System.Windows.Forms.ColumnClickEventArgs) Handles ListView.ColumnClick
        ListView.ListViewItemSorter = New ListViewItemComparer(e.Column)
        ListView.Sort()
    End Sub

    Class ListViewItemComparer
        Implements IComparer

        Private col As Integer

        Public Sub New()
            col = 0
        End Sub

        Public Sub New(ByVal column As Integer)
            col = column
        End Sub

        Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer Implements IComparer.Compare
            Return [String].Compare(CType(x, ListViewItem).SubItems(col).Text, CType(y, ListViewItem).SubItems(col).Text)
        End Function
    End Class

[wzuomin]

自动转成的c#代码如下（没测试，呵呵）

private void ListView_ColumnClick(object sender, System.Windows.Forms.ColumnClickEventArgs e) 
{ 
    ListView.ListViewItemSorter = new ListViewItemComparer(e.Column); 
    ListView.Sort(); 
} 
class ListViewItemComparer : IComparer 
{ 
    
    
    private int col; 
    
    public ListViewItemComparer() 
    { 
        col = 0; 
    } 
    
    public ListViewItemComparer(int column) 
    { 
        col = column; 
    } 
    
    public int IComparer.Compare(object x, object y) 
    { 
        return String.Compare(((ListViewItem)x).SubItems(col).Text, ((ListViewItem)y).SubItems(col).Text); 
    } 
} 

[zhnzzy]

if (columnsort.bAscending)
{
listView1.Sorting = SortOrder.Descending; //降序
}
else
{
listView1.Sorting = SortOrder.Ascending; //升序
}

[cononlove]

错误提示是这样的：
InvalidArgument=“4”的值对于“index”无效。
参数名: index
不明白是什么意思...

[wzuomin]

刚才自动转换的C#代码有问题，不能运行。
下面这个是可以运行的

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, System.EventArgs e)
        {
            for (int i = 0; i <= 10; i++)
            {
                ListViewItem item = new ListViewItem("Item" + i.ToString());
                item.SubItems.Add("TestItem");
                this.listView1.Items.Add(item);
            }
        }

        private void ListView_ColumnClick(object sender, System.Windows.Forms.ColumnClickEventArgs e)
        {
            this .listView1 .ListViewItemSorter  = new ListViewItemComparer(e.Column);
            this.listView1.Sort();
        }
        public class ListViewItemComparer : System.Collections.IComparer
        {            
            private int col;
            public bool bAscending = true  ; //用于设置升序或降序

            public ListViewItemComparer()
            {
                col = 0;
            }

            public ListViewItemComparer(int column)
            {
                col = column;
            }

            public int Compare(object x, object y)
            {
                if (bAscending )
                    return String.Compare(((ListViewItem)x).SubItems[col].Text, ((ListViewItem)y).SubItems[col].Text);
                else
                    return -1 * String.Compare(((ListViewItem)x).SubItems[col].Text, ((ListViewItem)y).SubItems[col].Text);
            }
        } 
    }
}

[Houkey]

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