Question

我有一个winforms DataGridView，我希望有一个包含每个记录的组合框的列。每个组合框对于每一行都具有完全不同的值，并且需要在DataGridView的数据绑定期间分配数据源。我可以为所有人分配1个数据源（这很简单），但让每个组合框具有不同的值看起来是不可能的。）

以下是我正在使用的内容 - 注意：DataGridView的数据源是通过从调用表单设置属性以编程方式定义的。

Public Class frmSendToQuickbooksPopup

    Public Property CurrentOrder As OrderICT
    Public Property lineitems As List(Of OrderLineItemICT)

    Private Sub frmSendToQuickbooksPopup_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        'define the combobox (datasource can't be assigned here as each will be different for each row)
        Dim dgvcboMatch As New DataGridViewComboBoxColumn
        dgvcboMatch.DisplayMember = "Name"
        dgvcboMatch.ValueMember = "ListID"
        dgvcboMatch.HeaderText = "Matches"
        dgvcboMatch.Name = "Match"
        dgvcboMatch.Width = 150
        dgvLineItems.Columns.Add(dgvcboMatch)

        Me.dgvLineItems.DataSource = lineitems
    End Sub

    Private Sub dgvLineItems_DataSourceChanged(sender As Object, e As EventArgs) Handles dgvLineItems.DataSourceChanged
        Dim L As New QBI.OrderLineItemICT
        With L
            dgvLineItems.Columns(.col_LineItemBvin).Visible = False
            dgvLineItems.Columns(.col_ProductId).Visible = False
            dgvLineItems.Columns(.col_ProductShortDescription).Visible = False
            dgvLineItems.Columns(.col_ShippingBoxCount).Visible = False
            dgvLineItems.Columns(.col_CustomProperties).Visible = False
            dgvLineItems.Columns(.col_ShippingLength).Visible = False
            dgvLineItems.Columns(.col_ShippingWidth).Visible = False
            dgvLineItems.Columns(.col_ShippingHeight).Visible = False
            dgvLineItems.Columns(.col_ProductName).DisplayIndex = 2
            dgvLineItems.Columns(.col_ProductName).HeaderText = "Product Name"
            dgvLineItems.Columns(.col_ProductName).Width = 170
            dgvLineItems.Columns(.col_ProductSku).HeaderText = "SKU"
            dgvLineItems.Columns(.col_ProductSku).Width = 160
            dgvLineItems.Columns(.col_Quantity).DefaultCellStyle.Format = "n0"
            dgvLineItems.Columns(.col_Quantity).DisplayIndex = 7
            dgvLineItems.Columns(.col_Quantity).DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter
            dgvLineItems.Columns(.col_Quantity).Width = 65
            dgvLineItems.Columns(.col_AdjustedPrice).DefaultCellStyle.Format = "c2"
            dgvLineItems.Columns(.col_AdjustedPrice).HeaderText = "Adj Price"
            dgvLineItems.Columns(.col_AdjustedPrice).DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight
            dgvLineItems.Columns(.col_AdjustedPrice).Width = 80
            dgvLineItems.Columns(.col_BasePrice).DefaultCellStyle.Format = "c2"
            dgvLineItems.Columns(.col_BasePrice).HeaderText = "Base Price"
            dgvLineItems.Columns(.col_BasePrice).DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight
            dgvLineItems.Columns(.col_BasePrice).Width = 85
            dgvLineItems.Columns(.col_Discounts).DefaultCellStyle.Format = "c2"
            dgvLineItems.Columns(.col_Discounts).HeaderText = "Discounts"
            dgvLineItems.Columns(.col_Discounts).DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight
            dgvLineItems.Columns(.col_Discounts).Width = 80
            dgvLineItems.Columns(.col_LineTotal).DefaultCellStyle.Format = "c2"
            dgvLineItems.Columns(.col_LineTotal).HeaderText = "Line Total"
            dgvLineItems.Columns(.col_LineTotal).DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight
            dgvLineItems.Columns(.col_LineTotal).Width = 80
            dgvLineItems.Columns(.col_UOM).DisplayIndex = 9
            dgvLineItems.Columns(.col_UOM).DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter
            dgvLineItems.Columns(.col_UOM).HeaderText = "Units"
            dgvLineItems.Columns(.col_UOM).Width = 55
            dgvLineItems.Columns(.col_ShippingWeight).DisplayIndex = 10
            dgvLineItems.Columns(.col_ShippingWeight).HeaderText = "Unit Wt"
            dgvLineItems.Columns(.col_ShippingWeight).DefaultCellStyle.Format = "N1"
            dgvLineItems.Columns(.col_ShippingWeight).DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight
            dgvLineItems.Columns(.col_ShippingWeight).Width = 70
        End With
    End Sub

Public Function GetComboboxData(ProductNameToMatch As String, ProductSKUToMatch As String) As List(Of WPM_Item)
    'this function returns a list of returned matches for a given row's ProductName or SKU
    'this function will be the datasource for a given combobox
    Dim itms As New List(Of WPM_Item)
    itms = WPM_Data.FindWPM_ItemMatch(ProductNameToMatch, ProductSKUToMatch)
    Return itms
End Function



End Class

如果有某种方法可以拦截DataGridView的数据绑定，那么我可以从另一个单元格中获取一个值（调用另一个过程），然后使用返回数据填充每一行的组合框。这很简单w / webforms，但我没有看到winforms版本的事件。

我尝试过的另一件事，但不起作用（组合框数据源只是消失了！）

Private Sub dgvLineItems_DataBindingComplete(sender As Object, e As DataGridViewBindingCompleteEventArgs) Handles dgvLineItems.DataBindingComplete
    For Each row As DataGridViewRow In Me.dgvLineItems.Rows
        Dim dr = DirectCast(row.DataBoundItem, OrderLineItemICT)
        If dr Is Nothing Then
            Return
        End If

        Dim name As String = row.Cells(dr.col_ProductName).Value.ToString
        Dim SKU As String = row.Cells(dr.col_ProductSku).Value.ToString

        Dim cell As DataGridViewComboBoxCell = TryCast(row.Cells("Match"), DataGridViewComboBoxCell)
        cell.DisplayStyle = DataGridViewComboBoxDisplayStyle.ComboBox

        Dim wpm_items As List(Of WPM_Item) = GetComboboxData(name, SKU)
        If cell.DataSource Is Nothing Then
            cell.DataSource = wpm_items 'this forgets the datasource, why?
            cell.DisplayMember = "Name"
            cell.ValueMember = "ListID"
            cell.Value = wpm_items.Item(0).Name 'this always throws an error "DataGridViewComboBoxCell value is not valid."
        End If

    Next

End Sub

这是同一作业的另一个版本，这次使用add方法填充组合框。（STILL不记得这些值）我基本上遵循了另一个论坛的想法 - 也许DotNet 4.5 DataGridView有一个错误。

Private Sub dgvLineItems_DataBindingComplete(sender As Object, e As DataGridViewBindingCompleteEventArgs) Handles dgvLineItems.DataBindingComplete
    For Each row As DataGridViewRow In Me.dgvLineItems.Rows
        Dim dr = DirectCast(row.DataBoundItem, OrderLineItemICT)
        If dr Is Nothing Then
            Return
        End If

        Dim name As String = row.Cells(dr.col_ProductName).Value.ToString
        Dim SKU As String = row.Cells(dr.col_ProductSku).Value.ToString

        Dim cell As DataGridViewComboBoxCell = DirectCast(row.Cells("Match"), DataGridViewComboBoxCell)
        cell.DisplayStyle = DataGridViewComboBoxDisplayStyle.ComboBox

        Dim wpm_items As List(Of WPM_Item) = GetComboboxData(name, SKU)

        'THIS DOES NOT WORK EITHER!! 
        cell.DisplayMember = "Name"
        cell.ValueMember = "ListID"
        For Each wItm As WPM_Item In wpm_items
            Dim c As New comboboxitem
            c.Text = wItm.Name
            c.Value = wItm.ListID
            cell.Items.Add(c)
        Next
    Next
End Sub
Public Class ComboboxItem
    Public Property Text() As String
    Public Property Value() As Object

    Public Overrides Function ToString() As String
        Return Text
    End Function
End Class

Answer 1

以下是C＃中有关DataGridViewComboBoxColumn DataGridView与Types不同的示例。

public static class ComboColumnDemo {

    public static DataGridView CreateSampleDGV() {

        DataTable table = new DataTable();
        table.Columns.Add("VariableType", typeof(String));
        table.Columns.Add("VariableId", typeof(int));
        table.Columns.Add("Custom", typeof(Object));
        table.Columns.Add("Default", typeof(Object));
        table.Columns.Add("Date", typeof(DateTime));
        table.Rows.Add(new Object[] { "int", 0, null, null, DateTime.MinValue });
        table.Rows.Add(new Object[] { "decimal", 0, null, null, DateTime.MinValue });
        table.Rows.Add(new Object[] { "enum", 0, null, null, DateTime.Now });
        table.Rows.Add(new Object[] { "date", 0, null, null, DateTime.UtcNow });
        table.Rows.Add(new Object[] { "person", 0, null, null, DateTime.Today });
        table.Rows.Add(new Object[] { "String", 0, null, null, DateTime.MaxValue });

        DataGridView dgv = new DataGridView();
        dgv.Dock = DockStyle.Fill;
        dgv.DataSource = table;
        dgv.EditMode = DataGridViewEditMode.EditOnEnter;
        dgv.AutoGenerateColumns = false;
        dgv.AllowUserToAddRows = false;

        DataGridViewComboBoxColumn colComboDefault = new DataGridViewComboBoxColumn { DataPropertyName = "Default", MaxDropDownItems = 20 };
        //col2.DisplayStyle = DataGridViewComboBoxDisplayStyle.Nothing; //.DropDownButton;
        colComboDefault.AutoComplete = true;
        colComboDefault.ValueType = typeof(Object);

        dgv.Columns.Add(new DataGridViewTextBoxColumn() { DataPropertyName = "VariableType" });
        dgv.Columns.Add(new DataGridViewTextBoxColumn() { DataPropertyName = "VariableId" });
        dgv.Columns.Add(colComboDefault);
        dgv.Columns.Add(new CalendarColumn { DataPropertyName = "Date" });

        foreach (DataGridViewColumn c in dgv.Columns)
            c.HeaderText = c.DataPropertyName;

        List<Object> strings = new List<Object>(new [] { "a", "b", "c" });
        var ints = new List<Object>(new Object[] { DBNull.Value, 1, 2, 3 });
        var decimals = new List<Object>(new Object[] { 1111111m, 2222222m, 3333333m });
        List<Object> dates = new List<Object>(new Object[] { DBNull.Value, DateTime.Today });
        List<Object> enums = new List<object>();
        enums.Add(DBNull.Value);
        enums.AddRange(Enum.GetValues(typeof(DayOfWeek)).Cast<Object>().ToArray());

        DataTable enumsTable = Opulos.Core.Utils.EnumUtil<DayOfWeek>.ToDataTable();

        List<Person> persons = new List<Person>();

        dgv.CellFormatting += (sender, e) => {
            var drv = (DataRowView) dgv.Rows[e.RowIndex].DataBoundItem;
            if (drv == null)
                return;

            DataRow dr = drv.Row;
            //String colName = dgv.Columns[col2].DataPropertyName;

            String vt = (String) dr["VariableType"]; //table.Rows[row][0].ToString();
            if (vt == "decimal" && e.ColumnIndex == 2) {
                if (e.Value is decimal) {
                    e.Value = ((decimal) e.Value).ToString("n0");
                    e.FormattingApplied = true;
                }
            }
        };

        dgv.CellBeginEdit += (sender, e) => {
        //dgv.EditingControlShowing += delegate {
            int rowIndex = e.RowIndex;//dgv.CurrentCell.RowIndex;
            int colIndex = e.ColumnIndex; //dgv.CurrentCell.ColumnIndex;
            DataGridViewColumn col = dgv.Columns[colIndex];

            try {
                var drv = (DataRowView) dgv.Rows[rowIndex].DataBoundItem;
                if (drv == null)
                    return;

                DataRow dr = drv.Row;
                //String colName = dgv.Columns[col2].DataPropertyName;

                String vt = (String) dr["VariableType"]; //table.Rows[row][0].ToString();
                //String vt = vm.VariableType;

                Object items = null;
                ComboBoxStyle? style = null;
                Type valueType = null;
                String formatString = null;
                String displayMember = null;
                String valueMember = null;

                if (vt == "String") {
                    items = strings;
                    valueType = typeof(String);
                }
                else if (vt == "int") {
                    items = ints;
                    valueType = typeof(int);
                }
                else if (vt == "decimal") {
                    items = decimals;
                    formatString = "n0";
                    valueType = typeof(decimal);
                }
                else if (vt == "date") {
                    items = dates;
                    valueType = typeof(DateTime);
                }
                else if (vt == "enum") {
                    if (col == colComboDefault) {
                        items = enumsTable;
                        displayMember = "Display";
                        valueMember = "Value";
                    }
                    else
                        items = enums;
                    style = ComboBoxStyle.DropDownList;
                    valueType = typeof(DayOfWeek);
                }
                else if (vt == "person") {
                    items = persons;
                    valueType = typeof(Person);
                }

                if (col == colComboDefault) {
                    var cell2 = (DataGridViewComboBoxCell) dgv.Rows[rowIndex].Cells[colIndex];
                    cell2.DataSource = items;
                    cell2.ValueType = valueType;
                    cell2.DisplayMember = displayMember;
                    cell2.ValueMember = valueMember;
                }

            } catch (Exception ex) {
                MessageBox.Show(dgv.FindForm(), ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        };

        return dgv;
    }
}

internal class Person {
    public String name;
    public override string ToString() {
        return name;
    }

    public override bool Equals(object obj) {
        if (obj is Person)
            return String.Compare(name, ((Person) obj).name, false) == 0;
        return false;
    }

    public override int GetHashCode() {
        return name.GetHashCode();
    }
}

Answer 2

Allrighty然后！这是一个有效的解决方案。我发现你必须以编程方式创建DataGridView（繁琐，是的！）并关闭列的自动生成（绝对必须） - 这可以防止dataGridView事件的多次触发。它还可以防止丢失组合框的数据源。使用DataBindingComplete事件并解析其中的行是最好的方法（CellFormatting事件是矫枉过正的，并且每次鼠标移动，单击，调整大小等都称为）。对于我们这些使用对象而不是数据表的人，我希望这个解决方案是可用的。

代码：

Imports QBI
Imports QBI.QBI
Imports QBI.AppCore.Xutilities

Public Class TestDGV1

    Public dgv1 As DataGridView

    Private Sub TestDGV1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        Dim ordlineitems As List(Of OrderLineItemICT)
        ordlineitems = Order_DataICT.GetNewOrderLineItemsICT("26073bff-3a08-4bc2-8da9-79c75534bd6b")
        dgv1 = Me.CreateDGV(ordlineitems) 'create the DataGridView and save it as "dgv1" (which must be publically accessible)

        Me.SplitContainer1.Panel2.Controls.Add(dgv1) 'NOTE, the datagridview is inside a SplitContainer
    End Sub

    Public Function CreateDGV(dsItems As List(Of OrderLineItemICT)) As DataGridView
        Dim dgv As New DataGridView()
        dgv.Dock = DockStyle.Fill
        dgv.DataSource = dsItems
        dgv.EditMode = DataGridViewEditMode.EditOnEnter
        dgv.AutoGenerateColumns = False
        dgv.AllowUserToAddRows = False

        Dim L As New QBI.OrderLineItemICT 'only using this reference for my column names defined elsewhere

        Dim col0 As New DataGridViewComboBoxColumn With {.Name = "Match", .DataPropertyName = "NameMatch", .DisplayMember = "Name", .ValueMember = "ListID", .HeaderText = "Matches", .AutoComplete = True}
        col0.DisplayIndex = 0

        Dim col1 As New DataGridViewTextBoxColumn With {.Name = L.col_LineItemBvin, .DataPropertyName = L.col_LineItemBvin, .Visible = False, .ReadOnly = True, .HeaderText = L.col_LineItemBvin}
        col1.DisplayIndex = 1

        Dim col2 As New DataGridViewTextBoxColumn With {.Name = L.col_ProductId, .DataPropertyName = L.col_ProductId, .Visible = False, .ReadOnly = True, .HeaderText = L.col_ProductId}
        col2.DisplayIndex = 2

        Dim col3 As New DataGridViewTextBoxColumn With {.Name = L.col_ProductSku, .DataPropertyName = L.col_ProductSku, .Visible = True, .ReadOnly = True, .HeaderText = "SKU"}
        col3.DisplayIndex = 3
        col3.Width = 160
        Dim col4 As New DataGridViewTextBoxColumn With {.Name = L.col_Quantity, .DataPropertyName = L.col_Quantity, .Visible = True, .ReadOnly = True, .HeaderText = "QTY"}
        col4.DisplayIndex = 9
        col4.Width = 65
        col4.DefaultCellStyle.Format = "n0"
        col4.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter

        Dim col5 As New DataGridViewTextBoxColumn With {.Name = L.col_BasePrice, .DataPropertyName = L.col_BasePrice, .Visible = True, .ReadOnly = True, .HeaderText = "Base Price"}
        col5.DisplayIndex = 6
        col5.DefaultCellStyle.Format = "c2"
        col5.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight
        col5.Width = 85

        Dim col6 As New DataGridViewTextBoxColumn With {.Name = L.col_Discounts, .DataPropertyName = L.col_Discounts, .Visible = True, .ReadOnly = True, .HeaderText = "Discounts"}
        col6.DisplayIndex = 7
        col6.DefaultCellStyle.Format = "c2"
        col6.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight
        col6.Width = 80

        Dim col7 As New DataGridViewTextBoxColumn With {.Name = L.col_AdjustedPrice, .DataPropertyName = L.col_AdjustedPrice, .Visible = True, .ReadOnly = True, .HeaderText = "Adj Price"}
        col7.DisplayIndex = 8
        col7.DefaultCellStyle.Format = "c2"
        col7.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight
        col7.Width = 80

        Dim col8 As New DataGridViewTextBoxColumn With {.Name = L.col_LineTotal, .DataPropertyName = L.col_LineTotal, .Visible = True, .ReadOnly = True, .HeaderText = "Line Total"}
        col8.DisplayIndex = 11
        col8.DefaultCellStyle.Format = "c2"
        col8.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight
        col8.Width = 80

        Dim col9 As New DataGridViewTextBoxColumn With {.Name = L.col_ProductName, .DataPropertyName = L.col_ProductName, .Visible = True, .ReadOnly = True, .HeaderText = "Product Name"}
        col9.DisplayIndex = 4
        col9.Width = 170

        Dim col10 As New DataGridViewTextBoxColumn With {.Name = L.col_ProductShortDescription, .DataPropertyName = L.col_ProductShortDescription, .Visible = False, .ReadOnly = True, .HeaderText = L.col_ProductShortDescription}
        col10.DisplayIndex = 5

        Dim col11 As New DataGridViewTextBoxColumn With {.Name = L.col_ShippingWeight, .DataPropertyName = L.col_ShippingWeight, .Visible = True, .ReadOnly = True, .HeaderText = "Unit Wt"}
        col11.DisplayIndex = 12
        col11.DefaultCellStyle.Format = "N1"
        col11.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleRight
        col11.Width = 70
        Dim col12 As New DataGridViewTextBoxColumn With {.Name = L.col_ShippingWidth, .DataPropertyName = L.col_ShippingWidth, .Visible = False, .ReadOnly = True, .HeaderText = L.col_ShippingWidth}
        col12.DisplayIndex = 13

        Dim col13 As New DataGridViewTextBoxColumn With {.Name = L.col_ShippingHeight, .DataPropertyName = L.col_ShippingHeight, .Visible = False, .ReadOnly = True, .HeaderText = L.col_ShippingHeight}
        col13.DisplayIndex = 14

        Dim col14 As New DataGridViewTextBoxColumn With {.Name = L.col_ShippingBoxCount, .DataPropertyName = L.col_ShippingBoxCount, .Visible = False, .ReadOnly = True, .HeaderText = L.col_ShippingBoxCount}
        col14.DisplayIndex = 15

        Dim col15 As New DataGridViewTextBoxColumn With {.Name = L.col_CustomProperties, .DataPropertyName = L.col_CustomProperties, .Visible = False, .ReadOnly = True, .HeaderText = L.col_CustomProperties}
        col15.DisplayIndex = 16

        Dim col16 As New DataGridViewTextBoxColumn With {.Name = L.col_UOM, .DataPropertyName = L.col_UOM, .Visible = True, .ReadOnly = True, .HeaderText = "Units"}
        col16.DisplayIndex = 10
        col16.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter
        col16.Width = 55

        dgv.Columns.AddRange({col0, col1, col2, col3, col4, col5, col6, col7, col8, col9, col10, col11, col12, col13, col14, col15, col16})

        AddHandler dgv.DataBindingComplete, AddressOf dgvLineItems_DataBindingComplete

        Return dgv
    End Function

    Private Sub dgvLineItems_DataBindingComplete(sender As Object, e As DataGridViewBindingCompleteEventArgs)
        For Each row As DataGridViewRow In Me.dgv1.Rows
            Dim dr = DirectCast(row.DataBoundItem, OrderLineItemICT)
            If dr Is Nothing Then
                Return
            End If

            Dim name As String = row.Cells(dr.col_ProductName).Value.ToString
            Dim SKU As String = row.Cells(dr.col_ProductSku).Value.ToString
            Dim cell As DataGridViewComboBoxCell = DirectCast(row.Cells("Match"), DataGridViewComboBoxCell)
            Dim wpm_items As List(Of WPM_Item) = GetComboboxData(name, SKU) 'function inside
            If cell.DataSource Is Nothing Then
                cell.DataSource = wpm_items 
                cell.DisplayMember = "Name"
                cell.ValueMember = "ListID"
                cell.Value = cell.Items(0).ListID
            End If
        Next
    End Sub

    Public Function GetComboboxData(ProductNameToMatch As String, ProductSKUToMatch As String) As List(Of WPM_Item)
        'this function returns a list of returned matches for a given row's ProductName or SKU
        'this function will be the datasource for a given combobox
        Dim itms As New List(Of WPM_Item)
        itms = WPM_Data.FindWPM_ItemMatch(ProductNameToMatch, ProductSKUToMatch)
        Return itms
    End Function

End Class

Answer 3

<强>解决方案

使用DataBindingComplete事件处理程序遍历行并为每个DataGridViewComboBoxCell设置源。

示例

以下是我如何做到这一点的一个例子。您需要添加DataGridView和ComboBox（有两个选项，即＆＃34;选项1和＃34;以及＆＃34;选项2＆＃34;，用于切换DataGridView.DataSource。Form。{/ p>
Public Class Form1 Public Property Groups As List(Of Group) Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load Me.Groups = Me.InitializeGroups() Dim cbc As New DataGridViewComboBoxColumn() cbc.DisplayMember = "Name" cbc.ValueMember = "ID" cbc.HeaderText = "Matches" cbc.Name = "Match" cbc.Width = 150 Me.DataGridView1.Columns.Add(cbc) Me.ComboBox1.SelectedIndex = 0 End Sub Private Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged Dim examples As New List(Of Example)() If Me.ComboBox1.SelectedIndex = 0 Then examples.Add(New Example("Me", "blah")) examples.Add(New Example("You", "blah")) Else examples.Add(New Example("Him", "blah")) examples.Add(New Example("Her", "blah")) examples.Add(New Example("It", "blah")) End If Me.DataGridView1.DataSource = examples End Sub Private Sub DataGridView1_DataBindingComplete(sender As Object, e As DataGridViewBindingCompleteEventArgs) Handles DataGridView1.DataBindingComplete For Each row As DataGridViewRow In Me.DataGridView1.Rows Dim cell As DataGridViewComboBoxCell = TryCast(row.Cells("Match"), DataGridViewComboBoxCell) cell.DataSource = Me.Groups.Where(Function(g) g.Members.Contains(row.Cells("Foo").Value.ToString())).ToList() cell.Value = cell.Items(0).ID ' Same property as combocell.ValueMember Next End Sub Private Function InitializeGroups() As List(Of Group) Dim groups = New List(Of Group)() From { _ New Group() With { _ .ID = 1, _ .Name = "All", _ .Members = New List(Of String)() From { _ "Me", _ "You", _ "Him", _ "Her", _ "It" _ } _ }, _ New Group() With { _ .ID = 2, _ .Name = "Them", _ .Members = New List(Of String)() From { _ "Him", _ "Her", _ "It" _ } _ }, _ New Group() With { _ .ID = 3, _ .Name = "Us", _ .Members = New List(Of String)() From { _ "Me", _ "You" _ } _ }, _ New Group() With { _ .ID = 4, _ .Name = "Me", _ .Members = New List(Of String)() From { _ "Me" _ } _ }, _ New Group() With { _ .ID = 5, _ .Name = "Human", _ .Members = New List(Of String)() From { _ "Me", _ "You", _ "Him", _ "Her" _ } _ }, _ New Group() With { _ .ID = 6, _ .Name = "Non-human", _ .Members = New List(Of String)() From { _ "It" _ } _ } _ } Return groups End Function End Class Public Class Example Public Sub New(foo__1 As String, bar__2 As String) Foo = foo__1 Bar = bar__2 End Sub Public Property Foo() As String Get Return m_Foo End Get Set(value As String) m_Foo = Value End Set End Property Private m_Foo As String Public Property Bar() As String Get Return m_Bar End Get Set(value As String) m_Bar = Value End Set End Property Private m_Bar As String End Class Public Class Group Public Sub New() Me.Members = New List(Of String)() End Sub Public Property ID() As Integer Get Return m_Id End Get Set(value As Integer) m_Id = value End Set End Property Private m_Id As String Public Property Name() As String Get Return m_Name End Get Set(value As String) m_Name = Value End Set End Property Private m_Name As String Public Property Members() As List(Of String) Get Return m_Members End Get Set(value As List(Of String)) m_Members = Value End Set End Property Private m_Members As List(Of String) End Class

如何为每条记录分配DataGridViewComboBox的不同数据源？

3 个答案: