Question

我有2个组合框，它们都使用相同的数据源。每当我更改其中一个组合框时，另一个更改为完全相同的值。

似乎要解决这个问题，我需要使用数据绑定。

我尝试过很多东西，但似乎没什么用。我的组合框名为comboBox1和comboBox2。下面是我试图用来使combobox2独立于comboBox1的源代码。任何帮助将不胜感激。

    BindingSource bs = new BindingSource(this.claimTypeBindingSource, null);
    BindingContext bc = new BindingContext();
    comboBox2.BindingContext = bc;
    comboBox2.DataSource = bs.DataSource;
    comboBox2.DisplayMember = "ClaimType";

EDIT 我刚刚从comboBox1中获取了dataSource赋值并使用代码进行了分配 - 代码现在看起来像这样。

    private void Form1_Activated(object sender, EventArgs e)
    {
        BindingSource bs1 = new BindingSource(this.claimTypeBindingSource, null);
        BindingContext bc1 = new BindingContext();
        comboBox1.BindingContext = bc1;
        comboBox1.DataSource = bs1.DataSource;
        comboBox1.DisplayMember = "ClaimType";

        BindingSource bs2 = new BindingSource(this.claimTypeBindingSource, null);
        BindingContext bc2 = new BindingContext();
        comboBox2.BindingContext = bc2;
        comboBox2.DataSource = bs2.DataSource;
        comboBox2.DisplayMember = "ClaimType";
    }

这还没有解决问题。如果我改变1个comboBox，那么另一个也会改变。

Answer 1

我刚刚解决了它:-) 这是有效的 - 我已将它放入我的真实项目中并且完美运行。

private void Form1_Activated(object sender, EventArgs e)
    {
        comboBox1.DataSource = new BindingSource(this.claimTypeBindingSource, null);
        comboBox1.DisplayMember = "ClaimType";

        comboBox2.DataSource = new BindingSource(this.claimTypeBindingSource, null);
        comboBox2.DisplayMember = "ClaimType";
    }

Answer 2

这是我用来填充两个组合框的简单代码从第一个组合框更改值不会更改其他值的值。

Public Class Form1

    Dim data As New List(Of Product)

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

        Dim bs1 As New BindingSource(data, Nothing)
        Dim bc1 As New BindingContext()
        ComboBox1.BindingContext = bc1
        ComboBox1.DataSource = bs1.DataSource
        ComboBox1.DisplayMember = "ProductName"

        Dim bs2 As New BindingSource(data, Nothing)
        Dim bc2 As New BindingContext()
        ComboBox2.BindingContext = bc2
        ComboBox2.DataSource = bs2.DataSource
        ComboBox2.DisplayMember = "ProductName"

    End Sub

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        For intCounter As Integer = 1 To 10
            data.Add(New Product(intCounter, intCounter.ToString))
        Next

    End Sub
End Class


Public Class Product

    Public Property ProductID As Integer = 0
    Public Property ProductName As String = String.Empty

    Public Sub New(ID As Integer, Name As String)

        Me.ProductID = ID
        Me.ProductName = Name
    End Sub

End Class

在C＃窗体中绑定Comboboxes

2 个答案: