如何在ListView中对整数列进行排序
c#,.net 2.0,Winform
System.Windows.Forms.ListView
这是我完成对多个列进行排序以及对每个列按数字或文本排序的方法:
首先使用以下类:
class Sorter : System.Collections.IComparer
{
public int Column = 0;
public System.Windows.Forms.SortOrder Order = SortOrder.Ascending;
public int Compare(object x, object y) // IComparer Member
{
if (!(x is ListViewItem))
return (0);
if (!(y is ListViewItem))
return (0);
ListViewItem l1 = (ListViewItem)x;
ListViewItem l2 = (ListViewItem)y;
if (l1.ListView.Columns[Column].Tag == null)
{
l1.ListView.Columns[Column].Tag = "Text";
}
if (l1.ListView.Columns[Column].Tag.ToString() == "Numeric")
{
float fl1 = float.Parse(l1.SubItems[Column].Text);
float fl2 = float.Parse(l2.SubItems[Column].Text);
if (Order == SortOrder.Ascending)
{
return fl1.CompareTo(fl2);
}
else
{
return fl2.CompareTo(fl1);
}
}
else
{
string str1 = l1.SubItems[Column].Text;
string str2 = l2.SubItems[Column].Text;
if (Order == SortOrder.Ascending)
{
return str1.CompareTo(str2);
}
else
{
return str2.CompareTo(str1);
}
}
}
}
在你的表单构造函数中,像这样设置排序器:
lvSeries.ListViewItemSorter = new Sorter();
然后像这样处理您的列表视图控件的ColumnClick事件:
private void lvSeries_ColumnClick(object sender, ColumnClickEventArgs e)
{
Sorter s = (Sorter)lvSeries.ListViewItemSorter;
s.Column = e.Column;
if (s.Order == System.Windows.Forms.SortOrder.Ascending)
{
s.Order = System.Windows.Forms.SortOrder.Descending;
}
else
{
s.Order = System.Windows.Forms.SortOrder.Ascending;
}
lvSeries.Sort();
}
这完全取决于每列的标签属性是否设置为“Numeric”,以便排序器知道如何排序。
在上面的示例中,当数字时,我将值强制转换为浮点数,您可能希望将其更改为整数。
if (l1.ListView.Columns[Column].Tag.ToString() == "Numeric")
更改为 if (l1.ListView.Columns[Column]..Text.ToUpper.IndexOf("ID") > -1
。
这个方法可行。感谢分享! - HATCHA您需要创建一个实现IComparer
接口(非泛型版本)的类。在该类中,您需要读取正确子项的Text
属性,将其转换为整数,并进行比较:
public class IntegerComparer : IComparer
{
private int _colIndex;
public IntegerComparer(int colIndex)
{
_colIndex = colIndex;
}
public int Compare(object x, object y)
{
int nx = int.Parse((x as ListViewItem).SubItems[_colIndex].Text);
int ny = int.Parse((y as ListViewItem).SubItems[_colIndex].Text);
return nx.CompareTo(ny);
}
}
// create a comparer for column index 1 and assign it to the control, and sort
myListView.ListViewItemSorter = new IntegerComparer(1);
myListView.Sort();
我使用了Neil-N的类,但将if语句更改为测试Type属性而不是Tag属性。对于每个具有整数值的列,我将其设置为Type Number(而不是Text)。排序效果很好。
if (l1.ListView.Columns[Column].Type.ToString() == "Number")
Public Class Form1
Private Sub btnSortListView_Click(sender As Object, e As EventArgs) Handles btnSortListView.Click
If btnSortListView.Text = "Sort Ascending" Then
ListViewGar.ListViewItemSorter = New IntegerComparer(1)
ListViewGar.Sort()
btnSortListView.Text = "Not Sort"
Else
ListViewGar.ListViewItemSorter = New IntegerComparer(0)
btnSortListView.Text = "Sort Ascending"
End If
End Sub
End Class
Public Class IntegerComparer
Implements System.Collections.IComparer
Private _colIndex As Integer
Public Sub New(ByVal colIndex As Integer)
MyBase.New
Me._colIndex = colIndex
End Sub
'Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer
' Dim nx As Integer = Integer.Parse(CType(x, ListViewItem).SubItems(Me._colIndex).Text)
' Dim ny As Integer = Integer.Parse(CType(y, ListViewItem).SubItems(Me._colIndex).Text)
' Return nx.CompareTo(ny)
'End Function
Private Function IComparer_Compare(x As Object, y As Object) As Integer Implements IComparer.Compare
Dim nx As Integer = Integer.Parse(CType(x, ListViewItem).SubItems(Me._colIndex).Text)
Dim ny As Integer = Integer.Parse(CType(y,ListViewItem).SubItems(Me._colIndex).Text)
Dim colIndPlus As Integer = Me._colIndex
Do While nx.CompareTo(ny) = 0
colIndPlus = colIndPlus + 1
nx = Integer.Parse(CType(x, ListViewItem).SubItems(colIndPlus).Text)
ny = Integer.Parse(CType(y, ListViewItem).SubItems(colIndPlus).Text)
Loop
Return nx.CompareTo(ny)
End Function
End Class
class ListViewAutoSorter : System.Collections.IComparer
{
private int Column = 0;
private System.Windows.Forms.SortOrder Order = SortOrder.Ascending;
public ListViewAutoSorter(int Column, SortOrder Order)
{
this.Column = Column;
this.Order = Order;
}
public int Compare(object x, object y) // IComparer Member
{
if (!(x is ListViewItem))
return (0);
if (!(y is ListViewItem))
return (0);
var l1 = (ListViewItem)x;
var l2 = (ListViewItem)y;
var value1 = 0.0;
var value2 = 0.0;
if (Double.TryParse(l1.SubItems[Column].Text, out value1) &&
Double.TryParse(l2.SubItems[Column].Text, out value2))
{
if (Order == SortOrder.Ascending)
{
return value1.CompareTo(value2);
}
else
{
return value2.CompareTo(value1);
}
}
else
{
var str1 = l1.SubItems[Column].Text;
var str2 = l2.SubItems[Column].Text;
if (Order == SortOrder.Ascending)
{
return str1.CompareTo(str2);
}
else
{
return str2.CompareTo(str1);
}
}
}
}