Question

我正在尝试将此词典集合绑定到组合框但显示器是不正确的。 displayMember应该是ProvName，ValueMember应该是键。

Private Sub Button8_Click(sender As Object, e As EventArgs) Handles Button8.Click

    Dim Country1 As Dictionary(Of String, Province)

    Country1 = Module1.CreateCountry

    'Display results in combox
    ComboBox3.DataSource = New BindingSource(Country1, Nothing)
    ComboBox2.DisplayMember = "Value"
    ComboBox2.ValueMember = "Key"



End Sub

模块Module1 公共省份作为CollectionBase

Function CreateCountry() As Dictionary(Of String, Province)

    Dim Country As New Dictionary(Of String, Province)

    Dim Prov As Province

    Prov = New Province
    With Prov
        .Abbrv = "Qc"
        .ProvName = "Quebec"
        .Population = "7 500 000"
        .Region = "East"
    End With
    Country.Add(Prov.Abbrv, Prov)

    Prov = New Province
    With Prov
        .Abbrv = "BC"
        .ProvName = "British Columbia"
        .Population = "4 500 000"
        .Region = "West"
    End With
    Country.Add(Prov.Abbrv, Prov)

    Prov = New Province
    With Prov
        .Abbrv = "NS"
        .ProvName = "Nova Scotia"
        .Population = "2 000 000"
        .Region = "Maritimes"
    End With
    Country.Add(Prov.Abbrv, Prov)

    Prov = New Province
    With Prov
        .Abbrv = "AB"
        .ProvName = "Alberta"
        .Population = "5 500 000"
        .Region = "Prairies"
    End With
    Country.Add(Prov.Abbrv, Prov)



    Return Country

End Function

结束模块

Public Class Province
  Public Property Abbrv As String
  Public Property ProvName As String
  Public Property Population As String
  Public Property Region As String

  Public Overrides Function ToString() As String
    Return ProvName
  End Function

End Class

Answer 1

以下是示例源代码：

 'Declare and Fill a generic Dictionary

    Dim dictionary As New Dictionary(Of String, Integer)
    dictionary.Add("one", 1)
    dictionary.Add("two", 2)
    dictionary.Add("three", 3)
    dictionary.Add("four", 4)
    dictionary.Add("five", 5)
    dictionary.Add("six", 6)
    dictionary.Add("seven", 7)
    dictionary.Add("eight", 8)

  'Initialize DisplayMember and ValueMember of an existing combobox to be filled with dictionary values

                    cboCombo.DisplayMember = "Key"
                    cboCombo.ValueMember = "Value"

'Bind the combobox to dictionary

                    cboCombo.DataSource = New BindingSource(dictionary, Nothing)

 'Now I can assign the selected value of combobox with this simple command:

                   cboCombo.SelectedValue = 4

'我还可以使用以下方法检索所选值： value = cboCombo.SelectedValue

如果这有助于您标记为答案

Answer 2

这只是使用字典将数据绑定到组合框的示例。

声明字典对象并使用以下值对其进行初始化：

Dim dcItems As New Dictionary(Of String, Integer)
lstTPAType.Add("Select", -1)
lstTPAType.Add("Item 1", 0)
lstTPAType.Add("Item 2", 1)
lstTPAType.Add("Item ", 2)

cmbMyCombo.DataSource = New BindingSource(dcItems, Nothing)
cmbMyCombo.ValueMember = "Value"
cmbMyCombo.DisplayMember = "Key"

希望这种通用解决方案能够帮助开发人员寻找它。

VB.Net：如何将字典集合绑定到Combobox？

2 个答案: