更改組合框中的一個項目的文本

Question

我有一個組合框，其中包含一個名稱列表：LastName + ", " + FirstName。

當選擇一個名稱時，它將分別填充兩個文本框，分別爲名字和姓氏。

我想要做的是，如果名稱在文本框中更改，我希望將更改更新爲ComboBox，而無需重新加載整個事物。我的組合框不直接從數據庫中加載，所以我不能使用RefreshItem()

這是否可能？

Answer 1

您可以實現INotifyPropertyChanged接口並使用BindingSource作爲ComboBox的DataContext。請參考下面的示例代碼。

Person.cs：

public class Person : INotifyPropertyChanged 
{ 
    private string _firstName; 
    public string FirstName 
    { 
     get { return _firstName; } 
     set { _firstName = value; NotifyPropertyChanged(); } 
    } 

    private string _lastName; 
    public string LastName 
    { 
     get { return _lastName; } 
     set { _lastName = value; NotifyPropertyChanged(); } 
    } 

    public string FullName { get { return LastName + ", " + FirstName; } } 

    public event PropertyChangedEventHandler PropertyChanged; 
    private void NotifyPropertyChanged([CallerMemberName] String propertyName = "") 
    { 
     if (PropertyChanged != null) 
      PropertyChanged(this, new PropertyChangedEventArgs(propertyName)); 
    } 
} 

Form1.cs中：

public partial class Form1 : Form 
{ 
    public Form1() 
    { 
     InitializeComponent(); 

     List<Person> people = new List<Person>() 
      { 
       new Person() { FirstName = "Donald", LastName = "Duck" }, 
       new Person() { FirstName = "Mickey", LastName = "Mouse" } 
      }; 
     BindingSource bs = new BindingSource(); 
     bs.DataSource = people; 
     comboBox1.DataSource = bs; 
     comboBox1.DisplayMember = "FullName"; 

     textBox1.DataBindings.Add(new Binding("Text", bs, "FirstName", false, DataSourceUpdateMode.OnPropertyChanged)); 
     textBox2.DataBindings.Add(new Binding("Text", bs, "LastName", false, DataSourceUpdateMode.OnPropertyChanged)); 

    } 
}