如何將列表綁定到組合框？ （的WinForms）

Question

我想連接綁定源類對象的列表，然後對象的值組合框任何人都可以建議如何做到這一點

public class Country 
    { 
     public string Name { get; set; } 
     public IList<City> Cities { get; set; } 

     public Country() 
     { 
      Cities = new List<City>(); 
     } 
    } 

是我的課，我想結合它的名字場綁定源它是用組合框，然後進行相關的

Answer 1

當你指的是一個組合框，我假設你不希望使用2路數據綁定（如果是這樣，看看使用BindingList）

public class Country 
{ 
    public string Name { get; set; } 
    public IList<City> Cities { get; set; } 
    public Country(string _name) 
    { 
     Cities = new List<City>(); 
     Name = _name; 
    } 
} 

List<Country> countries = new List<Country> { new Country("UK"), 
            new Country("Australia"), 
            new Country("France") }; 

bindingSource1.DataSource = countries; 

comboBox1.DataSource = bindingSource1.DataSource; 

comboBox1.DisplayMember = "Name"; 
comboBox1.ValueMember = "Name"; 

Answer 2

嘗試這樣：

yourControl.DataSource = countryInstance.Cities; 

如果您使用的WebForms，您將需要添加此行：

yourControl.DataBind(); 

Answer 3

對於一個背景介紹，有2種方式使用ComboBox/ListBox中

1）增加國家的OBJ影響項目屬性並將國家檢索爲Selecteditem。要使用這個，你應該重寫國家的ToString。

2）使用數據綁定，設置數據源的IList的（名單<>），並使用DisplayMember，ValueMember和的SelectedValue

對於2），就需要先

// not tested, schematic: 
List<Country> countries = ...; 
...; // fill 

comboBox1.DataSource = countries; 
comboBox1.DisplayMember="Name"; 
comboBox1.ValueMember="Cities"; 

國家的列表，然後在的SelectionChanged，

if (comboBox1.Selecteditem != null) 
{ 
    comboBox2.DataSource=comboBox1.SelectedValue; 

} 

Answer 4

public class Country 
    { 
     public string Name { get; set; } 
     public IList<City> Cities { get; set; } 

     public Country() 
     { 
      Cities = new List<City>(); 
     } 
    } 

    public class City { public string Name { get; set; } } 

List<Country> Countries = new List<Country> 
     { 
      new Country 
      { 
       Name = "Germany", 
       Cities = 
       { 
        new City {Name = "Berlin"}, 
        new City {Name = "Hamburg"} 
       } 
      }, 
      new Country 
      { 
       Name = "England", 
       Cities = 
       { 
        new City {Name = "London"}, 
        new City {Name = "Birmingham"} 
       } 
      } 
     }; 

     bindingSource1.DataSource = Countries; 
     member_CountryComboBox.DataSource = bindingSource1.DataSource; 
     member_CountryComboBox.DisplayMember = "Name"; 
     member_CountryComboBox.ValueMember = "Name"; 

這是代碼我現在使用

Answer 5

public MainWindow(){ 
    List<person> personList = new List<person>(); 

    personList.Add(new person { name = "rob", age = 32 }); 
    personList.Add(new person { name = "annie", age = 24 }); 
    personList.Add(new person { name = "paul", age = 19 }); 

    comboBox1.DataSource = personList; 
    comboBox1.DisplayMember = "name"; 

    comboBox1.SelectionChanged += new SelectionChangedEventHandler(comboBox1_SelectionChanged); 
} 


void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e) 
{ 
    person selectedPerson = comboBox1.SelectedItem as person; 
    messageBox.Show(selectedPerson.name, "caption goes here"); 
} 

繁榮。

Answer 6

如果您使用的是ToolStripComboBox控件沒有暴露的數據源（.NET 4.0）：

List<string> someList = new List<string>(); 
someList.Add("value"); 
someList.Add("value"); 
someList.Add("value"); 

toolStripComboBox1.Items.AddRange(someList.ToArray());