在Vb.net中設置Datagirdviewcombobox列值

Question

我有兩個datagridviewcombo列的datagrid，一列是動態填充，一列是固定的硬編碼值。 問題是我無法設置動態GridViewComboBox的值，當我嘗試設置它時會產生連續的錯誤。

System.FormateException：DataGridViewComboBoxCell值無效。

我的代碼加載電網

Dim dt As DataTable 
    dt = GetDataTable("Select valuecol,displayCol From mytable") 'GetDataTable gives me datatable 
    cmbAntibiotics.DataSource = dt 
    cmbAntibiotics.DisplayMember = "Antibiotics" 
    cmbAntibiotics.ValueMember = "AntibioticsID" 

Dim Index As Integer 

    Dim dgr As DataGridViewRow 
    For Each dr As DataRow In dtFromDB.Rows 'This datatable is filled with database 
     Index = dtFromDB.Rows.Count - 1 
     GRDAntimicrobials.Rows.Add() 
     GRDAntimicrobials.Rows(Index).Cells("cmbAntibiotics").Value = dr("AntibioticsID").ToString 'At this point it shows value (1,2,3) rather then showing its display members 
     GRDAntimicrobials.Rows(Index).Cells("AntibioticsStatus").Value = dr("AntibioticsStatus").ToString 
    Next 

請幫助我

Answer 1

好像你試圖給任何有賦值而不是實例化駐留在單元中的對象，然後分配其值。我會嘗試這樣的事情：

Dim vComboBoxColumn As DropDownList = DirectCast(GRDAntimicrobials.Rows(index).Cells("cmbAntibiotics")) 
vComboBoxColumn.Value = dr("AntibioticsStatus").ToString