VB.Net:如何将字典集合绑定到组合框? [英] VB.Net : How do you bind a dictionary collection to a Combobox?

问题描述

我正在尝试将此字典集合绑定到组合框，但显示是不正确的.displayMember 应该是 ProvName，ValueMember 应该是键.

I am trying to bind this dictionary collection to a combobox but the display is not correct. The displayMember should be the ProvName and the ValueMember should be the key.

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公共省份作为收藏库

Module Module1 Public provinces As 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

推荐答案

示例源代码如下:

 '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

'我还可以通过以下方式检索选定的值:值 = cboCombo.SelectedValue

'I can also retrive the selected value with: value = cboCombo.SelectedValue

如果这有助于您标记为答案

If this help you mark as answer

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