Question

我有一个datagridview，其数据源包含多对多的关系 Bin {ID，Name，BinGradeID}，BinGradeID {BinID，GradeID，GradeName}，等级{ID，Name}

我正在尝试在CheckedListBoxColumn中公开Grades，现在我似乎无法将任何内容放入checkedlistboxcolumn

我已经以编程方式将CheckedListBoxColumn添加到DataGridView。我不知道如何将其绑定到数据源，我在这里尝试了两个示例Add multiple checkedListbox to columns of datagrid View

我已经尝试了杰里米·汤普森发布的两个示例代码 - 我希望他的例子看起来不错，但我没有得到任何像这样的弹出/输出：

我使用checkedlistboxcolumn尝试了另一个，但这也无效。

以下是我将Column添加到DataGridView

的代码

Dim dgvChkCol As CheckedListBoxColumn = New CheckedListBoxColumn()
dgvChkCol.DataPropertyName = "GradeID"
dgvChkCol.Name = "GradesCheckBox"
dgvChkCol.Visible = True
dgvChkCol.HeaderText = "GradesCheckBox"
DataGridView1.Columns.Add(dgvChkCol)

VB或C＃中的任何代码都适合我 - 我可以轻松转换 - 我只是缺少CheckedListBox以及如何在DataGridView中执行此操作

如果有人想查看我的checkedlistbox代码 - 这是C＃转换为VBNET

Public Class CheckedListBoxColumn
    Inherits DataGridViewColumn
    Public Sub New()
        MyBase.New(New CheckedListBoxCell())
    End Sub

    Public Overrides Property CellTemplate() As DataGridViewCell
        Get
            Return MyBase.CellTemplate
        End Get
        Set(value As DataGridViewCell)
            If value IsNot Nothing AndAlso Not value.[GetType]().IsAssignableFrom(GetType(CheckedListBoxCell)) Then
                Throw New InvalidCastException("Must be a CheckedListBoxCell")
            End If
            MyBase.CellTemplate = value
        End Set
    End Property
End Class

Public Class CheckedListBoxCell
    Inherits DataGridViewCell
    Public Sub New()

        MyBase.New()
    End Sub

    Public Overrides Sub InitializeEditingControl(rowIndex As Integer, initialFormattedValue As Object, dataGridViewCellStyle As DataGridViewCellStyle)
        ' Set the value of the editing control to the current cell value.  
        MyBase.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle)
        Dim ctl As CheckedListBoxEditingControl = TryCast(DataGridView.EditingControl, CheckedListBoxEditingControl)
        InitializeCheckedListBox(ctl, DirectCast(Me.FormattedValue, ICollection))
    End Sub
    Private Sub InitializeCheckedListBox(ctrl As CheckedListBox, value As ICollection)
        ctrl.Items.Clear()
        For Each obj As Object In value
            ctrl.Items.Add(obj.ToString())
        Next
        ctrl.Tag = Me.Value
    End Sub
    Public Overrides ReadOnly Property EditType() As Type
        Get
            Return GetType(CheckedListBoxEditingControl)
        End Get
    End Property
    Protected Overrides Function GetFormattedValue(value As Object, rowIndex As Integer, ByRef cellStyle As DataGridViewCellStyle, valueTypeConverter As System.ComponentModel.TypeConverter, formattedValueTypeConverter As System.ComponentModel.TypeConverter, context As DataGridViewDataErrorContexts) As Object
        If value Is Nothing Then
            Return New List(Of Object)()
        End If
        Return MyBase.GetFormattedValue(value, rowIndex, cellStyle, valueTypeConverter, formattedValueTypeConverter, context)
    End Function
    Public Overrides ReadOnly Property FormattedValueType() As Type
        Get
            Return GetType(ICollection)
        End Get
    End Property
    Public Overrides Property ValueType() As Type
        Get
            Return GetType(ICollection)
        End Get
        Set(value As Type)

        End Set
    End Property
    Private internalControl As CheckedListBox

    Protected Overrides Sub Paint(graphics As System.Drawing.Graphics, clipBounds As System.Drawing.Rectangle, cellBounds As System.Drawing.Rectangle, rowIndex As Integer, cellState As DataGridViewElementStates, value As Object, _
        formattedValue As Object, errorText As String, cellStyle As DataGridViewCellStyle, advancedBorderStyle As DataGridViewAdvancedBorderStyle, paintParts As DataGridViewPaintParts)
        MyBase.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value, _
            formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts)
        graphics.FillRectangle(New SolidBrush(cellStyle.BackColor), cellBounds)

        If internalControl Is Nothing Then
            internalControl = New CheckedListBox()
        End If
        internalControl.Items.Clear()
        Dim collection As ICollection = TryCast(value, ICollection)
        If collection IsNot Nothing Then
            For Each obj As Object In collection
                internalControl.Items.Add(obj)
            Next
            Dim bmp As New Bitmap(cellBounds.Width, cellBounds.Height)
            internalControl.DrawToBitmap(bmp, New Rectangle(0, 0, bmp.Width, bmp.Height))
            graphics.DrawImage(bmp, cellBounds, New Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel)
        End If
    End Sub
    Protected Overrides Sub OnClick(e As DataGridViewCellEventArgs)
        Me.DataGridView.BeginEdit(False)
        MyBase.OnClick(e)
    End Sub

    Public ReadOnly Property CheckedItems() As ICollection 'Implements IDataGridViewEditingControl.
        Get
            If internalControl Is Nothing Then
                Return Nothing
            Else
                If internalControl IsNot Nothing Then
                    If internalControl.CheckedItems.Count > 0 Then
                        Return internalControl.CheckedItems
                    Else
                        If DirectCast(Me.dataGridView.Rows(rowIndex).Cells(ColumnIndex).DataGridView.EditingControl, CheckedListBox) IsNot Nothing Then
                            Dim checks As CheckedListBox = DirectCast(Me.dataGridView.Rows(rowIndex).Cells(ColumnIndex).DataGridView.EditingControl, CheckedListBox)
                            If checks.CheckedItems.Count > 0 Then
                                Return checks.CheckedItems
                            Else
                                Return Nothing
                            End If
                        Else
                            Return Nothing
                        End If
                    End If
                Else
                    Return Nothing
                End If
            End If
        End Get
    End Property

End Class

Class CheckedListBoxEditingControl
    Inherits CheckedListBox
    Implements IDataGridViewEditingControl
    Private dataGridView As DataGridView
    Private valueChanged As Boolean = False
    Private rowIndex As Integer


    Public Sub New()
    End Sub

    ' Implements the IDataGridViewEditingControl.EditingControlFormattedValue   
    ' property.  
    Public Property EditingControlFormattedValue() As Object Implements IDataGridViewEditingControl.EditingControlFormattedValue
        Get
            Return Me.Tag
        End Get
        '  this.Tag = value;  
        Set(value As Object)
        End Set
    End Property

    ' Implements the   
    ' IDataGridViewEditingControl.GetEditingControlFormattedValue method.  
    Public Function GetEditingControlFormattedValue(context As DataGridViewDataErrorContexts) As Object Implements IDataGridViewEditingControl.GetEditingControlFormattedValue
        Return EditingControlFormattedValue
    End Function

    ' Implements the   
    ' IDataGridViewEditingControl.ApplyCellStyleToEditingControl method.  
    Public Sub ApplyCellStyleToEditingControl(dataGridViewCellStyle As DataGridViewCellStyle) Implements IDataGridViewEditingControl.ApplyCellStyleToEditingControl
        Me.Font = dataGridViewCellStyle.Font
        Me.ForeColor = dataGridViewCellStyle.ForeColor
        Me.BackColor = dataGridViewCellStyle.BackColor
    End Sub

    ' Implements the IDataGridViewEditingControl.EditingControlRowIndex   
    ' property.  
    Public Property EditingControlRowIndex() As Integer Implements IDataGridViewEditingControl.EditingControlRowIndex
        Get
            Return rowIndex
        End Get
        Set(value As Integer)
            rowIndex = value
        End Set
    End Property

    ' Implements the IDataGridViewEditingControl.EditingControlWantsInputKey   
    ' method.  
    Public Function EditingControlWantsInputKey(key As Keys, dataGridViewWantsInputKey As Boolean) As Boolean Implements IDataGridViewEditingControl.EditingControlWantsInputKey
        ' Let the DateTimePicker handle the keys listed.  
        Select Case key And Keys.KeyCode
            Case Keys.Left, Keys.Up, Keys.Down, Keys.Right, Keys.Home, Keys.[End], _
                Keys.PageDown, Keys.PageUp
                Return True
            Case Else
                Return Not dataGridViewWantsInputKey
        End Select
    End Function

    ' Implements the IDataGridViewEditingControl.PrepareEditingControlForEdit   
    ' method.  
    Public Sub PrepareEditingControlForEdit(selectAll As Boolean) Implements IDataGridViewEditingControl.PrepareEditingControlForEdit
        ' No preparation needs to be done.  
    End Sub

    ' Implements the IDataGridViewEditingControl  
    ' .RepositionEditingControlOnValueChange property.  
    Public ReadOnly Property RepositionEditingControlOnValueChange() As Boolean Implements IDataGridViewEditingControl.RepositionEditingControlOnValueChange
        Get
            Return False
        End Get
    End Property

    ' Implements the IDataGridViewEditingControl  
    ' .EditingControlDataGridView property.  
    Public Property EditingControlDataGridView() As DataGridView Implements IDataGridViewEditingControl.EditingControlDataGridView
        Get
            Return dataGridView
        End Get
        Set(value As DataGridView)
            dataGridView = value
        End Set
    End Property

    ' Implements the IDataGridViewEditingControl  
    ' .EditingControlValueChanged property.  
    Public Property EditingControlValueChanged() As Boolean Implements IDataGridViewEditingControl.EditingControlValueChanged
        Get
            Return valueChanged
        End Get
        Set(value As Boolean)
            valueChanged = value
        End Set
    End Property

    ' Implements the IDataGridViewEditingControl  
    ' .EditingPanelCursor property.  
    Public ReadOnly Property EditingPanelCursor() As Cursor Implements IDataGridViewEditingControl.EditingPanelCursor
        Get
            Return MyBase.Cursor
        End Get
    End Property
End Class

DataGridview中的CheckedListBox Winforms VB NET

0 个答案: