我需要能够DataGridViewImageColumn
通过单击它的标题来对它进行排序。我在设计器中将排序模式设置为自动,但是当我单击标题时没有任何反应。
这些列是否可排序?
如果是这样,我需要做什么?
谢谢!
我需要能够DataGridViewImageColumn
通过单击它的标题来对它进行排序。我在设计器中将排序模式设置为自动,但是当我单击标题时没有任何反应。
这些列是否可排序?
如果是这样,我需要做什么?
谢谢!
我做了一个示例,展示了如何使用自定义比较器类对 dataGridView 进行排序。正如@Andrew Morton 发布的那样,网上有一些资源,这可能会有所帮助
我个人研究了 1./3。和 4. 将它们全部结合起来,我们就到了。我用两张图片(100x100 和 200x200px)对其进行了测试,并按宽度排序。当然,您可以将其更改为您想要的任何内容。
首先我创建了一个表格frmImateColumnSort.vb
Dim colName As New DataGridViewTextBoxColumn
Dim colImage As New DataGridViewImageColumn
Private Sub frmImageColumnSort_Load(sender As Object, e As EventArgs) Handles MyBase.Load
' create columns (or create them with designer)
colName.Name = "colName"
colName.HeaderText = "Name"
DataGridView1.Columns.Add(colName)
colImage.Name = "colImage"
colImage.HeaderText = "Image"
' we are going to set sortMode in source
' so we can show a sortGlyph
colImage.SortMode = DataGridViewColumnSortMode.Programmatic
DataGridView1.Columns.Add(colImage)
' add some demo data
DataGridView1.Rows.Add("imageA", Image.FromFile("imageA.jpg"))
DataGridView1.Rows.Add("imageB", Image.FromFile("imageB.jpg"))
End Sub
Private Sub DataGridView1_ColumnHeaderMouseClick(sender As Object, e As DataGridViewCellMouseEventArgs) Handles DataGridView1.ColumnHeaderMouseClick
' in case imageColumnHeader is clicked
If DataGridView1.Columns(e.ColumnIndex).Name = colImage.Name Then
' show correct sortingGlyph
Dim currentSortOrder = DataGridView1.Columns(e.ColumnIndex).HeaderCell.SortGlyphDirection
If currentSortOrder = SortOrder.None OrElse currentSortOrder = SortOrder.Descending Then
currentSortOrder = SortOrder.Ascending
Else
currentSortOrder = SortOrder.Descending
End If
DataGridView1.Columns(e.ColumnIndex).HeaderCell.SortGlyphDirection = currentSortOrder
' use a custom comparerClass to provide sorting abilities for images
DataGridView1.Sort(New ImageComparer(currentSortOrder))
End If
End Sub
之后我创建了一个ImageComparer.vb
类并实现了IComparer
.
Public Class ImageComparer
Implements System.Collections.IComparer
Private sortOrderModifier As Integer = 1
Public Sub New(ByVal sortOrder As SortOrder)
If sortOrder = sortOrder.Descending Then
sortOrderModifier = -1
ElseIf sortOrder = sortOrder.Ascending Then
sortOrderModifier = 1
End If
End Sub
Public Function Compare(ByVal x As Object, ByVal y As Object) As Integer _
Implements System.Collections.IComparer.Compare
Dim DataGridViewRow1 As DataGridViewRow = CType(x, DataGridViewRow)
Dim DataGridViewRow2 As DataGridViewRow = CType(y, DataGridViewRow)
' sort according to eg. Width by accessing column 1 - containing the image
' you may access any cell here. You might even sort imageColumn on any other colum
Dim img1 As Image = CType(DataGridViewRow1.Cells(1).Value, Image)
Dim img2 As Image = CType(DataGridViewRow2.Cells(1).Value, Image)
Dim CompareResult As Integer = img1.Width.CompareTo(img2.Width)
Return CompareResult * sortOrderModifier
End Function
End Class
这导致以下屏幕截图
如果您正在使用绑定到 dataGridView 的数据源,则必须对数据源进行排序!例如。对数据表图像列进行排序 q&a
hth
在这里提问之前,您应该做一些研究(例如在 google 上搜索)。
你会发现像http://www.vbforums.com/showthread.php?559639-RESOLVED-Sorting-a-DataGridView-image-column这样的东西。