Question

我正在尝试用数据库中的数据填充组合框 - 使用sql。我正在尝试使用来自多个字段的信息（名字，姓氏）。我需要程序来连接字段并添加＆＃39; FullName＆＃39;进入组合框。这是我正在使用的代码 - 我得到一个错误，因为名称应该显示在＆＃34; System.Data.DataRowView＆＃34; ：

Private Sub frmViewEmployee_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    con.Open()
    sqlstatement = "SELECT [First Name], [Last Name] FROM [EmployeeAccounts]"
    da = New OleDb.OleDbDataAdapter(sqlstatement, con)
    da.Fill(ds, "EmployeeName")
    Dim x As Short = 0
    Dim FirstName As String
    Dim LastName As String
    Dim MaxRows As Short = ds.Tables("EmployeeName").Rows.Count
    Dim FullName(MaxRows) As String
    x = 0
    While x < MaxRows
        FirstName = ds.Tables("EmployeeName").Rows(x).Item(0)
        LastName = ds.Tables("EmployeeName").Rows(x).Item(1)
        FullName(x) = FirstName & " " & LastName
        x = x + 1
    End While
        comEmployeeName.DataSource = ds.Tables(CStr("EmployeeName"))
        comEmployeeName.DisplayMember = CStr(FullName(x))
        comEmployeeName.ValueMember = CStr(FullName(x))
End Sub

任何答案都应该受到赞赏 - 无论是纠正还是新代码。

Answer 1

也许尝试更改你的sql：

"SELECT [First Name] + ' ' + [Last Name] As Fullname FROM [EmployeeAccounts]"

然后将Fullname设置为您的显示成员。

Answer 2

"SELECT [First Name] & ' ' & [Last Name] As Fullname FROM [EmployeeAccounts]"

将你的加号改为＆amp;因为vb.net喜欢他们+

Answer 3

我会将此列设为隐藏列，然后使用连接字符串生成另一列。

当您在组合框上设置显示成员字段时，它显示在屏幕上，并且您似乎在循环中声明单元格内容后设置该字段。我有根据的猜测是它无法工作。

Answer 4

[未经测试] 根据您正在使用的DBMS，您可以在sql语句中添加一个新字段，该字段将是名字和姓氏的串联。类似的东西：

sqlstatement = "SELECT [First Name] + ' ' + [Last Name] as FullName, [First Name], [Last Name] FROM [EmployeeAccounts]"

' It could be another syntax, it depends on your DBMS
sqlstatement = "SELECT [First Name] || ' ' || [Last Name] as FullName, [First Name], [Last Name] FROM [EmployeeAccounts]"

然后只需将ValueMember和DisplayMember设置为FullName：

comEmployeeName.DisplayMember ="FullName"
comEmployeeName.ValueMember="FullName"

不需要这部分代码：

While x < MaxRows
    FirstName = ds.Tables("EmployeeName").Rows(x).Item(0)
    LastName = ds.Tables("EmployeeName").Rows(x).Item(1)
    FullName(x) = FirstName & " " & LastName
    x = x + 1
End While

使用数据库中的多个数据字段填充组合框

4 个答案: