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我的第一篇文章，因为我找不到这个问题的答案。

我有一个带有一堆组合框的数据绑定 GridView。它们正确显示基础表中的值，并且正确的值出现在下拉列表中。1 个 Comboboxes 有一个 int .valuemember，一切都很好。另一个 ComboBox 具有字符串 .valuemember，当我在组合框中选择不同的值时，它不会更新到绑定表。

它们使用来自同一个表和同一个网格的相同代码绑定和更新。我专门绑定到 ESRI ArcGIS 文件。它似乎被正确绑定，我已经成功地将它用于其他项目。它会再次显示和更新所有列中的更改，并将接受基于整数的行的更改；因此，我可能愚蠢地排除了这一点。

不知道我需要做什么来更新字符串 .valuemember 值。

我想我错过了一些简单的东西，但我不知道它是什么。这是一些示例代码。

Domain1 As BindingList(Of Domaintype)
Domain2 As BindingList(Of Domaintype)
GridView.DataSource = pBindingSource

'add the columns desired
    GridView.Columns.Add(CreateComboBoxColumn("Column1Value", "Type1", Domain1 , "NonCodedIntValue"))
    GridView.Columns.Add(CreateComboBoxColumn("Column2Value", "Type2", Domain2 , "NonCodedCharValue"))

Private Function CreateComboBoxColumn(ByVal ColumnName As String, ByVal AliasName As String, ByRef DomainName As BindingList(Of Domaintype), ByVal pValueMember As String) As DataGridViewComboBoxColumn
    CreateComboBoxColumn = New DataGridViewComboBoxColumn
    With CreateComboBoxColumn
        .DataPropertyName = ColumnName
        .HeaderText = AliasName
        .ReadOnly = False
    End With
    With CreateComboBoxColumn
        .DataSource = DomainName
        .DisplayMember = "CodedValue"
        .ValueMember = pValueMember
    End With
    Return CreateComboBoxColumn
End Function

Private Sub GridView_CurrentCellDirtyStateChanged(ByVal sender As Object, ByVal e As EventArgs) Handles GridView.CurrentCellDirtyStateChanged
    If GridView.IsCurrentCellDirty Then
        GridView.CommitEdit(DataGridViewDataErrorContexts.Commit)
    End If
End Sub

Public Class Domaintype
    Private CodedValue As String
    Private NonCodedInt As Nullable(Of Short)
    Private NonCodedChar As String

    'adds a new coded value based on a sent non-coded and coded value
    Public Sub New(ByVal SentCodedValue As String, ByVal SentNonCoded As Nullable(Of Short), Optional ByVal SentNonCodedChar As String = Nothing)
        CodedValue = SentCodedValue
        NonCodedInt = SentNonCoded
        NonCodedChar = SentNonCodedChar
    End Sub
    'Gets or sets the coded value of a domain
    Public ReadOnly Property CodedValue() As String
        Get
            Return CodedValue
        End Get
    End Property
    'gets or sets the non-coded value of a domain
    Public ReadOnly Property NonCodedIntValue() As Nullable(Of Short)
        Get
            Return NonCodedInt
        End Get
    End Property

    'gets or sets the non-coded value of a domain
    Public ReadOnly Property NonCodedCharValue() As String
        Get
            Return NonCodedChar
        End Get
    End Property
End Class
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