为什么取不到dropdownlist的值 - 编程论坛

#2

冰镇柠檬汁儿2010-12-01 21:47

你设断点跟一下程序，告诉我DropDownList1.SelectedIndex和DropDownList1.SelectedItem.Text的值是什么？

#3

kiska30889152010-12-01 21:56

回复 2楼冰镇柠檬汁儿

报告头，看了一下，值都是“please choose”

#4

冰镇柠檬汁儿2010-12-01 22:35

值都知道了，还不明白问题出在什么地方了吗？

#5

kiska30889152010-12-01 22:50

回复 4楼冰镇柠檬汁儿

额，真不明白，问题是我调试时的确选择了出生年月啊，所以照理来说selectedindex不应该为0的，但是点submit的时候就是没把选中的数据读进去啊，我也不知道是怎么回事，求指教

#6

冰镇柠檬汁儿2010-12-01 22:59

submit按钮是.NET的控件吗？还是html的控件？能把submit响应的方法的代码发上来吗，让大家帮你看看

#7

kiska30889152010-12-01 23:19

回复 6楼冰镇柠檬汁儿

是.net控件
附上代码，麻烦诸位了

    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim logname As String
        Dim logpsw As String
        Dim username As String
        Dim email As String
        Dim address As String
        Dim birthday As String = ""
        Dim birthdayyear As String = ""
        Dim birthdaymonth As String = ""
        Dim birthdayday As String = ""
        logname = TextBoxlogname.Text
        logpsw = TextBoxlogpassword.Text
        username = TextBoxusername.Text
        email = TextBoxemail.Text
        address = TextBoxaddress.Text
        Dim connect As System.Data.OleDb.OleDbConnection = New System.Data.OleDb.OleDbConnection
        connect.ConnectionString = ("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("App_Data/database/shopping system of ultra electronics website.mdb"))
        Dim cmd As System.Data.OleDb.OleDbCommand = New System.Data.OleDb.OleDbCommand
        cmd.Connection = connect
         = "select logname from userinfo where logname=" + "'" + logname + "'"
        Dim result As String


        If DropDownList1.SelectedIndex <> 0 Then
            birthdayyear = DropDownList1.SelectedItem.Text
        End If
        If DropDownList2.SelectedIndex <> 0 Then
            birthdaymonth = DropDownList2.SelectedItem.Text
        End If
        If DropDownList3.SelectedIndex <> 0 Then
            birthdayday = DropDownList3.SelectedItem.Text
        End If
        birthday = birthdayyear + "/" + birthdaymonth + "/" + birthdayday

        Try
            connect.Open()
            result = cmd.ExecuteScalar
            If result = logname Then
                Response.Write("The logname is existed")
            Else
                = "insert into userinfo (logname,[password],username,gender,address,email,birthday) values ('" + logname + "','" + logpsw + "','" + username + "','" + gender + "','" + address + "','" + email + "','" + birthday + "')"
                cmd.ExecuteNonQuery()
                Response.Redirect("Registrationsuccessful.aspx?logname=" + logname)
            End If
        Catch ex As Exception
            Response.Write(ex.Message)
        End Try
        connect.Close()

    End Sub

#8

kiska30889152010-12-02 10:18

我自己查了一下，好像是说要判定ispostback，但我不知道加哪，望大虾指教

#9

kiska30889152010-12-02 10:28

终于搞定了，在pageload里初始化赋值给dropdownlist前，先判定一下ispostback是否为false就行了