Question

我使用此代碼以打印從DataGridView &選定行我接收此錯誤（不能執行上System.Int32和System.String「=」操作。）

Me.salesTableAdapter.Fill(Me.ordersDataSet.sales) 
    Me.ordersDataSet.sales.DefaultView.RowFilter = "id='" & 
    Form1.SalesDataGridView.Item(1, Form1.SalesDataGridView.CurrentRow.Index).Value & 
    "'" 
    salesBindingSource.DataSource = Me.ordersDataSet.sales.DefaultView 
    Me.ReportViewer1.RefreshReport() 

Answer 1

掉落''。

Me.ordersDataSet.sales.DefaultView.RowFilter = String.Format("id={0}", Form1.SalesDataGridView.Item(1, Form1.SalesDataGridView.CurrentRow.Index).Value) 

如果列/字段爲空，你可以這樣做：

Dim value As Object = Me.SalesDataGridView.Item(1, Me.SalesDataGridView.CurrentRow.Index).Value 

If ((value Is Nothing) OrElse ((TypeOf value Is DBNull) OrElse ((TypeOf value Is System.Data.SqlTypes.INullable) AndAlso DirectCast(value, System.Data.SqlTypes.INullable).IsNull))) Then 
    Me.ordersDataSet.sales.DefaultView.RowFilter = "[id] IS NULL" 
Else 
    Dim id As Integer = System.Convert.ToInt32(value) 
    Me.ordersDataSet.sales.DefaultView.RowFilter = String.Format("[id]={0}", id) 
End If