如何使用C#在列表视图列的标题中显示排序箭头？

Question

如何在列表视图中的已排序列的标题中显示排序箭头,该列表视图遵循操作系统的本机外观？

Answer 1

您可以使用以下扩展方法将排序箭头设置为特定列:

[EditorBrowsable(EditorBrowsableState.Never)]
public static class ListViewExtensions
{
    [StructLayout(LayoutKind.Sequential)]
    public struct HDITEM
    {
        public Mask mask;
        public int cxy;
        [MarshalAs(UnmanagedType.LPTStr)] public string pszText;
        public IntPtr hbm;
        public int cchTextMax;
        public Format fmt;
        public IntPtr lParam;
        // _WIN32_IE >= 0x0300 
        public int iImage;
        public int iOrder;
        // _WIN32_IE >= 0x0500
        public uint type;
        public IntPtr pvFilter;
        // _WIN32_WINNT >= 0x0600
        public uint state;

        [Flags]
        public enum Mask
        {
            Format = 0x4,       // HDI_FORMAT
        };

        [Flags]
        public enum Format
        {
            SortDown = 0x200,   // HDF_SORTDOWN
            SortUp = 0x400,     // HDF_SORTUP
        };
    };

    public const int LVM_FIRST = 0x1000;
    public const int LVM_GETHEADER = LVM_FIRST + 31;

    public const int HDM_FIRST = 0x1200;
    public const int HDM_GETITEM = HDM_FIRST + 11;
    public const int HDM_SETITEM = HDM_FIRST + 12;

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern IntPtr SendMessage(IntPtr hWnd, UInt32 msg, IntPtr wParam, IntPtr lParam);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern IntPtr SendMessage(IntPtr hWnd, UInt32 msg, IntPtr wParam, ref HDITEM lParam);

    public static void SetSortIcon(this ListView listViewControl, int columnIndex, SortOrder order)
    {
        IntPtr columnHeader = SendMessage(listViewControl.Handle, LVM_GETHEADER, IntPtr.Zero, IntPtr.Zero);
        for (int columnNumber = 0; columnNumber <= listViewControl.Columns.Count - 1; columnNumber++)
        {
            var columnPtr = new IntPtr(columnNumber);
            var item = new HDITEM
                {
                    mask = HDITEM.Mask.Format
                };

            if (SendMessage(columnHeader, HDM_GETITEM, columnPtr, ref item) == IntPtr.Zero)
            {
                throw new Win32Exception();
            }

            if (order != SortOrder.None && columnNumber == columnIndex)
            {
                switch (order)
                {
                    case SortOrder.Ascending:
                        item.fmt &= ~HDITEM.Format.SortDown;
                        item.fmt |= HDITEM.Format.SortUp;
                        break;
                    case SortOrder.Descending:
                        item.fmt &= ~HDITEM.Format.SortUp;
                        item.fmt |= HDITEM.Format.SortDown;
                        break;
                }
            }
            else
            {
                item.fmt &= ~HDITEM.Format.SortDown & ~HDITEM.Format.SortUp;
            }

            if (SendMessage(columnHeader, HDM_SETITEM, columnPtr, ref item) == IntPtr.Zero)
            {
                throw new Win32Exception();
            }
        }
    }
}

然后,您可以像这样调用扩展方法:

myListView.SetSortIcon(0, SortOrder.Ascending);

它通过使用P/Invoke来工作:

• 使用LVM_GETHEADER消息获取列表视图的标头控件的句柄.
• 使用HDM_GETITEM消息获取有关标题列的信息.
• 然后它修改fmt设置/清除返回的HDITEM结构上的标志HDF_SORTDOWN和HDF_SORTUP标志.
• 最后,它重新设置了HDM_SETITEM消息的信息.

这就是它的样子:

Answer 2

安德鲁很好的回答.如果有人在这里寻找VB.net等价物,它是:

Public Module ListViewExtensions
    Public Enum SortOrder
        None
        Ascending
        Descending
    End Enum

    <StructLayout(LayoutKind.Sequential)>
    Public Structure HDITEM
        Public theMask As Mask
        Public cxy As Integer
        <MarshalAs(UnmanagedType.LPTStr)>
        Public pszText As String
        Public hbm As IntPtr
        Public cchTextMax As Integer
        Public fmt As Format
        Public lParam As IntPtr
        ' _WIN32_IE >= 0x0300 
        Public iImage As Integer
        Public iOrder As Integer
        ' _WIN32_IE >= 0x0500
        Public type As UInteger
        Public pvFilter As IntPtr
        ' _WIN32_WINNT >= 0x0600
        Public state As UInteger

        <Flags()>
        Public Enum Mask
            Format = &H4       ' HDI_FORMAT
        End Enum


        <Flags()>
        Public Enum Format
            SortDown = &H200 ' HDF_SORTDOWN
            SortUp = &H400     ' HDF_SORTUP
        End Enum
    End Structure

    Public Const LVM_FIRST As Integer = &H1000
    Public Const LVM_GETHEADER As Integer = LVM_FIRST + 31

    Public Const HDM_FIRST As Integer = &H1200
    Public Const HDM_GETITEM As Integer = HDM_FIRST + 11
    Public Const HDM_SETITEM As Integer = HDM_FIRST + 12

    <DllImport("user32.dll", CharSet:=CharSet.Auto, SetLastError:=True)>
    Public Function SendMessage(hWnd As IntPtr, msg As UInt32, wParam As IntPtr, lParam As IntPtr) As IntPtr
    End Function

    <DllImport("user32.dll", CharSet:=CharSet.Auto, SetLastError:=True)>
    Public Function SendMessage(hWnd As IntPtr, msg As UInt32, wParam As IntPtr, ByRef lParam As HDITEM) As IntPtr
    End Function

    <Extension()>
    Public Sub SetSortIcon(listViewControl As ListView, columnIndex As Integer, order As SortOrder)
        Dim columnHeader As IntPtr = SendMessage(listViewControl.Handle, LVM_GETHEADER, IntPtr.Zero, IntPtr.Zero)
        For columnNumber As Integer = 0 To listViewControl.Columns.Count - 1

            Dim columnPtr As New IntPtr(columnNumber)
            Dim item As New HDITEM

            item.theMask = HDITEM.Mask.Format

            If SendMessage(columnHeader, HDM_GETITEM, columnPtr, item) = IntPtr.Zero Then Throw New Win32Exception

            If order <> SortOrder.None AndAlso columnNumber = columnIndex Then
                Select Case order
                    Case SortOrder.Ascending
                        item.fmt = item.fmt And Not HDITEM.Format.SortDown
                        item.fmt = item.fmt Or HDITEM.Format.SortUp
                    Case SortOrder.Descending
                        item.fmt = item.fmt And Not HDITEM.Format.SortUp
                        item.fmt = item.fmt Or HDITEM.Format.SortDown
                End Select
            Else
                item.fmt = item.fmt And Not HDITEM.Format.SortDown And Not HDITEM.Format.SortUp
            End If

            If SendMessage(columnHeader, HDM_SETITEM, columnPtr, item) = IntPtr.Zero Then Throw New Win32Exception
        Next
    End Sub
End Module

Answer 3

您可以妥协并使用看起来像箭头的字符（我使用 chammap 选择它们），而不是弄乱 Windows API

\n\n

private void SetSortArrow(ColumnHeader head, SortOrder order)\n{\n    const string ascArrow = " \xe2\x96\xb2";\n    const string descArrow = " \xe2\x96\xbc";\n\n    // remove arrow\n    if(head.Text.EndsWith(ascArrow) || head.Text.EndsWith(descArrow))\n        head.Text = head.Text.Substring(0, head.Text.Length-2);\n\n    // add arrow\n    switch (order)\n    {\n        case SortOrder.Ascending: head.Text += ascArrow; break;\n        case  SortOrder.Descending: head.Text += descArrow; break;\n    }\n}\n\nSetSortArrow(listView1.Columns[0], SortOrder.None);       // remove arrow from first column if present\nSetSortArrow(listView1.Columns[1], SortOrder.Ascending);  // set second column arrow to ascending\nSetSortArrow(listView1.Columns[1], SortOrder.Descending); // set second column arrow to descending\n

\n