VB下拉列表框的选择项改变事件

[nyxuem]

以下是我的某个窗体的加载和下拉框列表选择项改变事件
不写下拉框列表选择项改变事件时一切正常，省份正确读取并绑定到下拉框列表中，但
写了下拉框列表选择项改变事件后，就报错了，错误：从类型“DataRowView”到类型“Integer”的转换无效。对应红色字体

Private Sub ProviceCityForm_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)
Dim conStr As String
conStr = "Data Source=.;Initial Catalog=MyTestDB;Integrated Security=True"
Dim con As New SqlConnection(conStr)

'查询所有省份
Dim sql As String
sql = "SELECT * FROM [MyTestDB].[dbo].[provinceCity] WHERE ParentId = 0"
Dim adapter As New SqlDataAdapter(sql, con)
Dim ds As New DataSet()
adapter.Fill(ds)
'绑定所有省份下拉列表框
Me.cboProvice.DataSource = ds.Tables(0)
Me.cboProvice.DisplayMember = "Name"
Me.cboProvice.ValueMember = "ID"
End Sub

Private Sub cboProvice_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cboProvice.SelectedIndexChanged
Dim conStr As String
conStr = "Data Source=.;Initial Catalog=MyTestDB;Integrated Security=True"
Dim con As New SqlConnection(conStr)

'查询所有省份
Dim pId As Integer
pId = Me.cboProvice.SelectedValue
Dim sql As String
sql = "SELECT * FROM [MyTestDB].[dbo].[provinceCity] WHERE ParentId = " & pId
Dim adapter As New SqlDataAdapter(sql, con)
Dim ds As New DataSet()
adapter.Fill(ds)
'绑定所有省份下拉列表框
Me.cboCity.DataSource = ds.Tables(0)
Me.cboCity.DisplayMember = "Name"
Me.cboCity.ValueMember = "ID"
End Sub

[BossProgrammer]

Me.cboProvice.SelectedValue,这是你下拉框中选中的数据吧，是数字吗？

[swinda009]

改为Me.cboProvice.text

[swinda009]

搞错了,没仔细看改为

[nyxuem]

嗯，是的，是从数据库读出来的ID值。

[nyxuem]

调试时，发现经过Load事件的这句话就跳到红色字体。

[nyxuem]

图片指： '绑定所有省份下拉列表框 下面的那句话：Me.cboProvice.DataSource = ds.Tables(0)

[ChataoCoding]

下拉框用绑定的话读出来的项类型是DataRowView.

Dim pId As Integer
Dim rv As DataRowView
rv = Me.cboProvice.SelectedValue
pId = rv("列名")

[hmc108]

在load的事件中，开始的地方删除cboProvice_SelectedIndexChanged的监听，在结束处在添加上

[nyxuem]

谁知道怎么弄？

[nyxuem]

已解决，受ChataoCoding启发。谢谢大家。

[nyxuem]

回复ChataoCoding:这样写过后，执行到 Me.cboProvice.ValueMember = "ID"时，跳到
rv = Me.cboProvice.SelectedValue这句话，还是报错：无法将int32类型强制转换成DataRowView类型

回复hmc108：怎么删除cboProvice_SelectedIndexChanged的监听？具体代码有吗？