数据绑定到文本框

Data binding to Textboxes(数据绑定到文本框)

问题描述

   Dim myconn As New SqlConnection("Server=server,Trusted_Connection=True,Database=database")
    'selects from mt table linking the current pc to a row
    Dim sql As String = "SELECT * from idset " & vbcrlf &
    "Where pcname= '" & pcname & "'"
    Dim ds As New DataSet
    Dim da As New SqlDataAdapter(sql, myconn)

    da.Fill(ds, "Setup")


    txtClientID.DataBindings.Add("text", ds.Tables("idset"), "CLID")

我不知道为什么由于某种原因它没有工作它没有填充数据集我是否声明了错误?

I don't know why its not working for some reason its not filling the data set did I declare something wrong?

推荐答案

它不起作用的原因是因为您指定传入的表应映射到名为 Setup 的表.您的数据集不包含名为 Setup 的表，因此传入的表将被命名为......好吧，Setup.

The reason why it don't work is because you specify that the incoming table should be mapped to a table named Setup. Your data set doesn't contain a table named Setup, so the incoming table will be named... well, Setup.

试试这个:

da.Fill(ds, "idset")

另外，我强烈建议你:

Also, I strongly suggest you:

• 在
上设置 选项严格
• 始终使用参数化/准备a> SQL 查询.
• 在处理一次性对象时，始终使用 Using 语句.

• Set option strict on
• Always use parameterized/prepared SQL queries.
• Always use the Using statement when working with disposable objects.

说真的.

调试绑定的最佳方法是使用 BindingSource 并处理 BindingComplete 事件.

The best way to debug bindings is to use a BindingSource and handle the BindingComplete event.

Private bs As BindingSource
Private ds As DataSet

Private Sub Initialize(pcname As String)

    Me.ds = New DataSet()

    Using connection As New SqlConnection("Server=server,Trusted_Connection=True,Database=database")
        connection.Open()
        Using command As New SqlCommand()
            command.Connection = connection
            command.CommandText = "SELECT * from [idset] Where [pcname] = @pcname;"
            command.Parameters.AddWithValue("@pcname", pcname)
            Using adapter As New SqlDataAdapter(command)
                adapter.Fill(Me.ds, "idset")
            End Using
        End Using
    End Using

    Me.bs = New BindingSource(Me.ds, "idset")

    AddHandler bs.BindingComplete, AddressOf Me.HandleBindingCompleted

    Me.txtClientID.DataBindings.Add("Text", Me.bs, "CLID")

End Sub

Private Sub HandleBindingCompleted(sender As Object, e As BindingCompleteEventArgs)
    If (Not e.Exception Is Nothing) Then
        Debug.WriteLine(e.ErrorText)
    End If
End Sub

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