Vb.net 需要在Gridview中填充下拉组合框(未绑定列)
在gridview中填充下拉列表时遇到困难。 我已使用以下代码创建了该列:Vb.net 需要在Gridview中填充下拉组合框(未绑定列),vb.net,winforms,datagridview,drop-down-menu,Vb.net,Winforms,Datagridview,Drop Down Menu,在gridview中填充下拉列表时遇到困难。 我已使用以下代码创建了该列: If Not Me.GridViewIsConstructed Then gv.Columns.Add(createComboBoxWithDDL(Me.ddlGPField.Items, "Bank_GP_Field_Name", "GPField")) gv.Columns.Add(createComboBoxWithDDL(Me.ddlBankField.Item
If Not Me.GridViewIsConstructed Then
gv.Columns.Add(createComboBoxWithDDL(Me.ddlGPField.Items, "Bank_GP_Field_Name", "GPField"))
gv.Columns.Add(createComboBoxWithDDL(Me.ddlBankField.Items, "Bank_Bank_Field_Name", "BankField"))
End IF
Private Function createComboBoxWithDDL(ByVal obj As Object, ByVal nDataFieldName As String, ByVal nColName As String) As DataGridViewComboBoxColumn
Dim combo As New DataGridViewComboBoxColumn
combo.DataSource = obj
combo.DataPropertyName = nDataFieldName
combo.Name = nColName
Return combo
End Function
问题是我无法获得格式化句柄,无法用所需的索引填充组合框。这是我对BankField下拉列表的代码尝试
If e.ColumnIndex = gv.Columns("BankField").Index Then
e.FormattingApplied = True
Dim _row = gv.Rows(e.RowIndex)
Dim _cell As New DataGridViewComboBoxColumn
fillGPFieldList(_cell)
_cell.DisplayIndex = 1
_cell.DisplayMember = "Credit"
_cell.ValueMember = "Credit"
_cell.DataSource = _cell.Items
e.Value = _cell
End If
If e.ColumnIndex = gv.Columns("TrxType").Index Then
e.FormattingApplied = True
e.Value = "BAL"
End If
Gridview可以很好地显示下拉对象,它总是设置为索引-1
请帮忙
V***********附录编辑
不幸的是,没有人回答我的问题。所以我解决了整个问题。这很难看,如果有任何反馈,我将不胜感激
我始终无法将组合框绑定到数据源。我什么都试了,直到我脸色发青。所以我开始做一些基本的工作,对所有的自动代码进行编码。我很好奇为什么自动装订不起作用。可能是因为我的gridview数据源是LINQ
这是我如何做到的。我希望有人能从我最后48小时的delima中获益:
首先,要知道我的表单上有两个下拉列表,一个是GPField,另一个是BankField。这些是已填充的静态DDL。所以我用它们来欺骗值,而不是使用枚举
我认为这无关紧要,但以下是我如何填写GPField和BankField:
Sub fillGPFieldListDDL(ByVal obj As Object)
Dim db As New CompanyDataDataContext
Dim myConn As New Connection With {.ConnCls = ConnCls}
myConn.dbConnect(db)
'Setup the GP Field list
obj.Items.Clear()
For Each fld In db.getGPFieldList(Me.ddlImportID.SelectedItem, ddlImportTypes.BNKREC_IMPORTS_WORK)
obj.Items.Add(fld.Trim)
Next
db.Connection.Close()
db.Connection.Dispose()
db.Dispose()
End Sub
Sub fillBankFieldListDDL(ByVal obj As Object)
If String.IsNullOrEmpty(ddlImportID.Text) Then
Return
End If
Dim db As New CompanyDataDataContext
Dim myConn As New Connection With {.ConnCls = ConnCls}
myConn.dbConnect(db)
'Setup the Bank Field list
obj.Items.Clear()
For Each fld In db.getImportIDVirtualFields(Me.ddlImportID.Text, ddlImportTypes.BNKREC_IMPORTS_WORK)
obj.Items.Add(fld.Trim)
Next
db.Connection.Close()
db.Connection.Dispose()
db.Dispose()
End Sub
接下来,根据用户的选择,我使用以下函数填充网格:
Function fillToleranceFieldsGridView(ByVal nTrxType As String) As Integer
Dim myConn As New Connection With {.ConnCls = ConnCls}
Try
Using db As New CompanyDataDataContext
myConn.dbConnect(db)
'Dim _query As IEnumerable(Of TWO_Tolerance_Field) = (From tf In db.getToleranceSetupRecordFields(nTrxType, BankToleranceRecordTypes.MasterRecord) _
' Select tf)
'Dim _query2 As IEnumerable(Of TWO_Tolerance_Field) = db.getToleranceSetupRecordFields(nTrxType, BankToleranceRecordTypes.MasterRecord)
Dim _query3 = (From t In db.TWO_Tolerance_Fields _
Where t.TRXTYPESTRING = nTrxType And t.RCRDTYPE = BankToleranceRecordTypes.MasterRecord _
Select t.Bank_Bank_Field_Number, t.Bank_GP_Field_Name, t.TRXTYPESTRING)
Dim gv = Me.DataGridViewX1
gv.AutoGenerateColumns = False
gv.AllowUserToAddRows = False
gv.AllowUserToDeleteRows = False
gv.AllowUserToResizeRows = False
gv.AutoSize = True
gv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells
'gv.DataSource = _query3
If Not Me.GridViewIsConstructed Then
'Add in the combo box for GPField Names
Dim _comboCol As DataGridViewComboBoxColumn
_comboCol = CreateComboBoxColumn(Me.ddlGPField.Items, _
ColumnNameData.Bank_GP_Field_Name.ToString, _
FieldNames.GPField.ToString)
gv.Columns.Add(_comboCol)
_comboCol = CreateComboBoxColumn(Me.ddlBankField.Items, _
ColumnNameData.Bank_Bank_Field_Number.ToString, _
FieldNames.BankField.ToString)
gv.Columns.Add(_comboCol)
Dim col As DataGridViewColumn = _
New DataGridViewTextBoxColumn()
Dim _cell = New DataGridViewTextBoxCell
Dim _coll = New DataGridViewColumn(_cell)
Dim _colIndex As Integer = 0
''Bind to an existing column Left in for easy access for a simple text box
'_coll = New DataGridViewColumn(_cell)
'_coll.Name = ColumnNameData.Bank_GP_Field_Name.ToString
'_coll.ReadOnly = True
'_coll.HeaderText = ColumnNameData.Bank_GP_Field_Name.ToString
'_colIndex = gv.Columns.Add(_coll)
'gv.Columns(_colIndex).DataPropertyName = ColumnNameData.Bank_GP_Field_Name.ToString
Me.GridViewIsConstructed = True
End If
gv.Rows.Clear()
Dim ri As Integer = 0
For Each r In _query3
Dim _row As New DataGridViewRow
_row.CreateCells(gv)
_row.Cells(FieldNames.GPField).Value = r.Bank_GP_Field_Name.ToString.Trim
_row.Cells(FieldNames.BankField).Value = ddlBankField.Items(r.Bank_Bank_Field_Number - 1).ToString.Trim
gv.Rows.Add(_row)
ri += 1
Next
db.Connection.Close()
db.Connection.Dispose()
End Using
Return 0
Catch ex As Exception
Throw ex
Finally
myConn.Dispose()
End Try
End Function
因此,未回答的问题是:
1). 我不能使用_query或_query2作为gridview的数据源,但是_query3可以用于简单的文本框。
2). 如果使用_query3作为gv.datasource,为什么在执行gv.Columns.Add(_comboCol)时,我的组合框会抛出“bank\u gp\u field\u name”not found错误
3). 我理解我无法将gv绑定到_query3的原因,因为Bank_Bank_字段_number中的数据是一个整数,并且DDL值在整数和字符串值之间没有转换。但我指出,该字段期望GPField在标准绑定上运行。我仍然发现gv.Columns.Add(\u comboCol)上不存在名为“Bank\u GP\u Field\u Name”的字段
总之,为什么下面的代码不能工作而上面的代码却可以
Function fillToleranceFieldsGridView(ByVal nTrxType As String) As Integer
Dim myConn As New Connection With {.ConnCls = ConnCls}
Try
Using db As New CompanyDataDataContext
myConn.dbConnect(db)
'Dim _query As IEnumerable(Of TWO_Tolerance_Field) = (From tf In db.getToleranceSetupRecordFields(nTrxType, BankToleranceRecordTypes.MasterRecord) _
' Select tf)
'Dim _query2 As IEnumerable(Of TWO_Tolerance_Field) = db.getToleranceSetupRecordFields(nTrxType, BankToleranceRecordTypes.MasterRecord)
Dim _query3 = (From t In db.TWO_Tolerance_Fields _
Where t.TRXTYPESTRING = nTrxType And t.RCRDTYPE = BankToleranceRecordTypes.MasterRecord _
Select t.Bank_Bank_Field_Number, t.Bank_GP_Field_Name, t.TRXTYPESTRING)
Dim gv = Me.DataGridViewX1
gv.AutoGenerateColumns = False
gv.AllowUserToAddRows = False
gv.AllowUserToDeleteRows = False
gv.AllowUserToResizeRows = False
gv.AutoSize = True
gv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells
gv.DataSource = _query3
If Not Me.GridViewIsConstructed Then
'Add in the combo box for GPField Names
Dim _comboCol As DataGridViewComboBoxColumn
_comboCol = CreateComboBoxColumn(Me.ddlGPField.Items, _
ColumnNameData.Bank_GP_Field_Name.ToString, _
FieldNames.GPField.ToString)
gv.Columns.Add(_comboCol)
'_comboCol = CreateComboBoxColumn(Me.ddlBankField.Items, _
' ColumnNameData.Bank_Bank_Field_Number.ToString, _
' FieldNames.BankField.ToString)
'gv.Columns.Add(_comboCol)
Dim col As DataGridViewColumn = _
New DataGridViewTextBoxColumn()
Dim _cell = New DataGridViewTextBoxCell
Dim _coll = New DataGridViewColumn(_cell)
Dim _colIndex As Integer = 0
''Bind to an existing column Left in for easy access for a simple text box
'_coll = New DataGridViewColumn(_cell)
'_coll.Name = ColumnNameData.Bank_GP_Field_Name.ToString
'_coll.ReadOnly = True
'_coll.HeaderText = ColumnNameData.Bank_GP_Field_Name.ToString
'_colIndex = gv.Columns.Add(_coll)
'gv.Columns(_colIndex).DataPropertyName = ColumnNameData.Bank_GP_Field_Name.ToString
Me.GridViewIsConstructed = True
End If
'gv.Rows.Clear()
'Dim ri As Integer = 0
'For Each r In _query3
' Dim _row As New DataGridViewRow
' _row.CreateCells(gv)
' _row.Cells(FieldNames.GPField).Value = r.Bank_GP_Field_Name.ToString.Trim
' _row.Cells(FieldNames.BankField).Value = ddlBankField.Items(r.Bank_Bank_Field_Number - 1).ToString.Trim
' gv.Rows.Add(_row)
' ri += 1
'Next
db.Connection.Close()
db.Connection.Dispose()
End Using
Return 0
Catch ex As Exception
Throw ex
Finally
myConn.Dispose()
End Try
End Function
Private Function CreateComboBoxColumn(ByVal obj As ComboBox.ObjectCollection, ByVal nDataFieldName As String, ByVal nColName As String) _
As DataGridViewComboBoxColumn
Dim column As New DataGridViewComboBoxColumn()
With (column)
.HeaderText = nColName
.DropDownWidth = 160
.Width = 90
.MaxDropDownItems = 3
.FlatStyle = FlatStyle.Flat
.DataSource = obj
.DataPropertyName = nDataFieldName
.Name = nColName
.ValueMember = nDataFieldName
.DisplayMember = .ValueMember
End With
Return column
End Function
很抱歉,如果我误解或过度简化了这一点,但据我所知,combox绑定良好,您不能将索引设置为1?这是因为该单元格没有基础数据吗 您是否尝试过设置列的默认值?据我所知,DataGridViewComboxColumn没有单元格默认值,但可以使用列默认值
Columns(“ColumName”).DefaultValue=1
您也可以尝试处理所需的defaultvalues
Private Sub gv_DefaultValuesNeeded(ByVal sender As Object, _
ByVal e As System.Windows.Forms.DataGridViewRowEventArgs) _
Handles gv.DefaultValuesNeeded
With e.Row
.Cells("GPField") = 1
.Cells("BankField") = 1
End With
End Sub