这真让我抓狂。我正在从菜单屏幕上的 button_click 调用表单。在 Form2 上的 form_load 中途，它正在从菜单屏幕重新调用 button_click 并且没有完成 form_load。它总是发生在第二个组合框的 execute_reader 上。
我已经尝试注释掉第二个组合框的整个代码块并且 form_load 完成但是如果我关闭该表单并再次单击菜单屏幕上的按钮，它会重新调用相同的 button_click 但就在 adapter.Fill(桌子）。
来自 frmMenu 的代码
Private Sub btnManageEquipment_Click(sender As Object, e As EventArgs) Handles_ btnManageEquipment.Click
frmManageEquipment2.Show()
Me.Hide()
End Sub
来自 frmManageEquipment2_Load 的代码
Private Sub frmManageEquipment2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
strString = "Select * from equipment"
adapter = New MySqlDataAdapter(strString, conn)
Dim commandBuilder As New MySqlCommandBuilder(adapter)
table.Locale = System.Globalization.CultureInfo.InvariantCulture
adapter.Fill(table)
bindEquipment.DataSource = table
navEquipment.BindingSource = bindEquipment
Me.txtEqName.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_Name", True))
Me.cboArea.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_area", True))
Me.cboEqSubarea.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_subarea", True))
'Me.cboEqType.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_type", True))
'Me.txtMarca.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_marca", True))
'Me.txtModel.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_model", True))
'Me.txtCapacity.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_capacity", True))
'Me.txtSerieEquipe.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_SerieEquipe", True))
'Me.txtSerieMotor.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_SerieMotor", True))
'Me.txtEngineMarca.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_EngineMarka", True))
'Me.txtEngineModel.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_EngineModel", True))
'Me.txtAirFilter.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_AirFilter", True))
'Me.txtTorqueConversion.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_TorqueConversion", True))
'Me.txtTransmission.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_Transmission", True))
'Me.txtAxle.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_Axle", True))
'Me.txtBrakes.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_Brakes", True))
'Me.txtStarterElecSystem.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_StarterElectSystem", True))
'Me.txtTireSize.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_TireSize", True))
'Me.txtFireSupprSystem.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_FireSupprSystem", True))
'Me.txtCost.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_cost", True))
'Me.txtPurchaseDate.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_PurchaseDate", True))
'Me.txtLifeExpectance.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_LifeExpectancy", True))
'Me.txtSellPrice.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_SellPrice", True))
'Me.dtpSellDate.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_SellDate", True))
''Me.txtEqID.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_ID", True))
'Me.txtEqID.DataBindings.Add(New Binding("Text", Me.bindEquipment, "Eq_ID", True))
cboArea.AutoCompleteMode = AutoCompleteMode.Append
strSQLArea = "Select distinct(eq_Area) from Equipment order by eq_Area"
sqlCommand = New MySqlCommand(strSQLArea, conn)
Dim readerArea As MySqlDataReader = sqlCommand.ExecuteReader()
While readerArea.Read()
cboArea.Items.Add(readerArea.GetString(0))
End While
cboArea.AutoCompleteMode = AutoCompleteMode.Append
cboArea.AutoCompleteSource = AutoCompleteSource.ListItems
cboEqSubarea.AutoCompleteMode = AutoCompleteMode.Append
strSQLSubArea = "Select distinct(eq_SubArea) from Equipment order by eq_SubArea"
sqlCommand = New MySqlCommand(strSQLSubArea, conn)
Dim readerSubArea As MySqlDataReader = sqlCommand.ExecuteReader()
'*****This is where it kicks back to the button click from the menu screen*******
While readerSubArea.Read()
cboEqSubarea.Items.Add(readerSubArea.GetString(0))
End While
cboEqSubarea.AutoCompleteMode = AutoCompleteMode.Append
cboEqSubarea.AutoCompleteSource = AutoCompleteSource.ListItems
End Sub
* * *我已经完全改变了处理这个问题的方式，但仍然遇到同样的问题。现在我正在使用数据适配器并将我的文本框绑定到它们的属性字段中。我真的很想使用自动完成功能
Private Sub frmManageEquipment2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'AssetmgtDataSet.equipment' table. You can move, or remove it, as needed.
Me.EquipmentTableAdapter.Fill(Me.AssetmgtDataSet.equipment)
strSQL = "Select distinct(eq_Area) from Equipment order by eq_Area"
txtArea.AutoCompleteMode = AutoCompleteMode.SuggestAppend
txtArea.AutoCompleteSource = AutoCompleteSource.CustomSource
sqlCommand = New MySqlCommand(strSQL, conn)
Dim readerArea As MySqlDataReader = sqlCommand.ExecuteReader
Dim sStringCollArea As New AutoCompleteStringCollection
While readerArea.Read()
sStringCollArea.AddRange(New String() {readerArea(0)})
End While
readerArea.Close()
txtArea.AutoCompleteCustomSource = sStringCollArea
strSQL = "Select distinct(eq_SubArea) from Equipment order by eq_SubArea"
txtSubarea.AutoCompleteMode = AutoCompleteMode.SuggestAppend
txtSubarea.AutoCompleteSource = AutoCompleteSource.CustomSource
sqlCommand = New MySqlCommand(strSQL, conn)
Dim readerSubArea As MySqlDataReader = sqlCommand.ExecuteReader
Dim sStringCollSubArea As New AutoCompleteStringCollection
While readerSubArea.Read()
****'This is where it goes back to the menu screen now****
sStringCollSubArea.AddRange(New String() {readerSubArea(0)})
End While
readerSubArea.Close()
txtSubarea.AutoCompleteCustomSource = sStringCollSubArea
End Sub