C# 如何在列表视图中对整数进行排序
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原文地址: http://stackoverflow.com/questions/1214289/
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StackOverFlow
how do I sort Integers in a listview
提问by Brad
How do I sort columns of integers in a ListView
如何对 ListView 中的整数列进行排序
c#, .net 2.0, Winform
C#、.net 2.0、Winform
System.Windows.Forms.ListView
系统.Windows.Forms.ListView
采纳答案by Neil N
This is how I accomplished being able to sort on multiple columns, and being able to sort each column as a number, or as text.
这就是我如何实现能够对多列进行排序，并且能够将每一列作为数字或文本进行排序。
First use this class:
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);
}
}
}
}
In your form's constructor, set the sorter like this:
在表单的构造函数中，像这样设置排序器：
lvSeries.ListViewItemSorter = new Sorter();
Then handle the ColumnClick even of your listview control like this:
然后像这样处理 ColumnClick 甚至你的列表视图控件：
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();
}
This is all dependent on the Tag property of each column either being set to "Numeric" or not, so the sorter knows how to sort.
这完全取决于每列的 Tag 属性是否设置为“Numeric”，因此排序器知道如何排序。
In the above example I cast the values as floats when numeric, you may want to change that to int.
在上面的示例中，我将数值转换为浮点数，您可能希望将其更改为 int。
回答by Jimmy Chandra
I'd do it in the data source (model) instead of the view. Sort it there and it should update it in the view through databinding.
我会在数据源（模型）而不是视图中进行。在那里对它进行排序，它应该通过数据绑定在视图中更新它。
回答by Fredrik M?rk
You will need to create a class that implements the IComparerinterface (the non-generic one). In that class you read the Textproperty from the correct sub-item, convert it to int, and do the comparison:
您将需要创建一个实现IComparer接口的类（非通用类）。在该类中，您Text从正确的子项中读取属性，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);
}
}
Then you assign such a comparer to the ListViewItemSorter property and invoke the sort method of the ListView control:
然后将这样的比较器分配给 ListViewItemSorter 属性并调用 ListView 控件的排序方法：
// create a comparer for column index 1 and assign it to the control, and sort
myListView.ListViewItemSorter = new IntegerComparer(1);
myListView.Sort();
回答by Grammarian
If you are getting started with a ListView, your life will be much much easier if you use an ObjectListViewinstead. ObjectListView is an open source wrapper around .NET WinForms ListView, and it solves all these annoying little problems that normally make working with a ListView so frustrating. For example, it automatically sorts ints so that '100' comes after '3' (DateTimes, bools, and everything else sorts correctly too).
如果您刚开始使用 ListView，如果您改用ObjectListView，您的生活会容易得多。ObjectListView 是一个围绕 .NET WinForms ListView 的开源包装器，它解决了所有这些恼人的小问题，这些小问题通常会使使用 ListView 变得如此令人沮丧。例如，它会自动对整数进行排序，以便“100”排在“3”之后（DateTimes、bools 和其他所有内容也都正确排序）。
Seriously, you will never want to go back to a plain ListView after using an ObjectListView.
说真的，在使用 ObjectListView 之后，您将永远不想回到普通的 ListView。
Yes, I am the author -- but that doesn't mean I'm biased... OK, well maybe it does :) Look herefor some other people's opinions.
是的，我是作者——但这并不意味着我有偏见......好吧，也许确实如此:)在这里看看其他人的意见。
回答by VicF
I used Neil-N's class but changed the if statement to test the Type property instead of the Tag property. I set each column to Type Number (instead of Text) that had an integer value in it. Sort works great.
我使用了 Neil-N 的类，但更改了 if 语句来测试 Type 属性而不是 Tag 属性。我将每一列设置为类型编号（而不是文本），其中包含一个整数值。排序效果很好。
if (l1.ListView.Columns[Column].Type.ToString() == "Number")
回答by Martin.Martinsson
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);
}
}
}
}
回答by YourFriend
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
