如何对ListView中的整数列进行排序
c#,。net 2.0,Winform
System.Windows.Forms.ListView
答案 0 :(得分:19)
这就是我完成对多列进行排序,并能够将每列排序为数字或文本的方法。
首先使用这个类:
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);
}
}
}
}
在表单的构造函数中,将分类器设置为:
lvSeries.ListViewItemSorter = new Sorter();
然后像这样处理ListClick甚至是listview控件:
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Tag属性是否设置为“Numeric”,因此分拣机知道如何排序。
在上面的示例中,我将数值转换为浮点值,您可能希望将其更改为int。
答案 1 :(得分:5)
如果您开始使用ListView,那么如果您使用ObjectListView,您的生活将会轻松得多。 ObjectListView是一个围绕.NET WinForms ListView的开源包装器,它解决了所有这些烦人的小问题,这些问题通常使得使用ListView非常令人沮丧。例如,它会自动对int进行排序,以便在'3'之后出现'100'(DateTimes,bools,以及其他所有其他排序也正确)。
说真的,在使用ObjectListView之后,你永远不会想要回到普通的ListView。
是的,我是作者 - 但这并不意味着我有偏见......好吧,也许它确实如此:)看看here其他人的意见。
答案 2 :(得分:3)
您需要创建一个实现IComparer
接口的类(非通用接口)。在该类中,您从正确的子项中读取Text
属性,将其转换为int,然后进行比较:
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);
}
}
然后将这样的比较器分配给ListViewItemSorter属性并调用ListView控件的sort方法:
// create a comparer for column index 1 and assign it to the control, and sort
myListView.ListViewItemSorter = new IntegerComparer(1);
myListView.Sort();
答案 3 :(得分:0)
我会在数据源(模型)而不是视图中执行此操作。在那里排序它应该通过数据绑定在视图中更新它。
答案 4 :(得分:0)
我使用了Neil-N的类,但更改了if语句以测试Type属性而不是Tag属性。我将每列设置为Type Number(而不是Text),其中包含整数值。排序效果很好。
if (l1.ListView.Columns[Column].Type.ToString() == "Number")
答案 5 :(得分:0)
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);
}
}
}
}
答案 6 :(得分:0)
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