我使用此代码在vb.net:VB.net改变ComboBox中选定值,显示
Function GetBillingMonthsGrouped() As List(Of BillingMonthsGrouped)
Dim conn = New MySqlConnection()
Dim conn2 = New MySqlConnection()
Dim myCommand, myCommand2 As New MySqlCommand
Dim reader, reader2 As MySqlDataReader
Dim SQL As String
conn.ConnectionString = "server=" + global_variables.web_server_ip + "; user id=" + global_variables.web_server_username + "; password=" + global_variables.web_server_password + "; database=" + global_variables.web_server_database + "; "
conn2.ConnectionString = "server=" + global_variables.web_server_ip + "; user id=" + global_variables.web_server_username + "; password=" + global_variables.web_server_password + "; database=" + global_variables.web_server_database + "; "
Dim billingMonthsGrouped = New List(Of BillingMonthsGrouped)
'customers
conn.Open()
SQL = "select MONTH(timestamp) from billing group by MONTH(timestamp) order by MONTH(timestamp) ASC "
myCommand.Connection = conn
myCommand.CommandText = SQL
reader = myCommand.ExecuteReader
While reader.Read()
billingMonthsGrouped.Add(New BillingMonthsGrouped(reader.GetString(0), MonthName(reader.GetString(0))))
End While
conn.Close()
Return billingMonthsGrouped
End Function
Public Class BillingMonthsGrouped
Public Sub New(ByVal id As String, ByVal name As String)
mID = id
mName = name
End Sub
Private mID As String
Public Property ID() As String
Get
Return mID
End Get
Set(ByVal value As String)
mID = value
End Set
End Property
Private mName As String
Public Property Name() As String
Get
Return mName
End Get
Set(ByVal value As String)
mName = value
End Set
End Property
End Class
,然后这部分:
ComboBox3.DataSource = GetBillingMonthsGrouped()
ComboBox3.DisplayMember = "Name"
ComboBox3.ValueMember = "ID"
ComboBox3.SelectedIndex = 0
,我会需要什么样的代码用来改变的ComboBox3
选择的值是当前月份
我尝试使用:
ComboBox3.SelectedValue = DateTime.Now.ToString("MM")
但这并不会改变选定的值。我需要将月份数值和月份显示为月份名称
你使用之前'ComboBox3。 SelectedValue = DateTime.Now.ToString(“MM”)',组合框中的可用值是多少?请在尝试更改SelectedValue之前指定所有可用的键/值对。另外,当时'DateTime.Now.ToString(“MM”)'的值是多少? – Neolisk 2014-11-03 13:19:35