VB LINQ to SQL作为变量

Question

我到处搜索，找不到答案。每个示例都有一个datagridview或在Select处停止。我需要将DataContext结果存储为VB中的变量。在前面的代码中，我使用下拉列表中的客户名称填充ComobBox。然后，当用户从Combbox列表中选择客户名称时，我想：

Private Sub ComboBox1_SelectedIndexChanged(sender As System.Object, e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged

Dim dbmanex As New Manex_LINQDataContext
Dim dbPhone = From c In dbmanex.CUSTOMERs
Where c.CUSTNAME = Me.ComboBox1.Text
Select c.PHONE
Me.PhoneTextBox.Text = dbPhone
End Sub

PhoneTextBox.Text只是空白。任何见解将不胜感激。

Kirill Bestemyanov解决：

Private Sub ComboBox1_SelectedIndexChanged(sender As System.Object, e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged

Dim dbmanex As New Manex_LINQDataContext
Dim dbPhone = From c In dbmanex.CUSTOMERs
Select c.PHONE
Me.PhoneTextBox.Text = dbPhone.Single()
End Sub

Answer 1

您应该具体化您的查询。

Me.PhoneTextBox.Text=dbPhone.Single();

当您调用Single（）时，您的查询将调用db并从中获取值。