Question sur la liste déroulante et les étiquettes

Question

J'ai une liste déroulante qui contient 5 éléments. J'ai une étiquette sur la fenêtre. Ce que je voudrais faire est quand un utilisateur clique sur l'un des éléments de la liste déroulante, le texte remplira cette étiquette. Je souhaite afficher des informations sur l'élément sélectionné (adresse IP, etc.). Toute aide est appréciée. Merci.

code:

private void cmbGroups_SelectionChanged(object sender, SelectionChangedEventArgs e) 
{ 
    //Combo box selection changed. Re-bind data 
    string selectedGroup = (string)cmbGroups.SelectedItem; 
    BindGrid(selectedGroup); 
} 

code:

private void BindGrid(string selectedGroup) 
    { 
     //Re-bind the grid 
     dgPortStatus.DataContext = _dicPortStatus[selectedGroup].Portstatus.DefaultView; 

     InitializeColumns(); 
    } 

code:

private void _UpdatePortStatus() 
    { 
     string[] files = Directory.GetFiles(System.Configuration.ConfigurationSettings.AppSettings["portStatusDir"], "PortStatus.*"); 

     foreach (string file in files) 
     { 

      PortStatus ps = new PortStatus(); 
      ps.ReadXml(new StreamReader(file)); 
      //ps.ReadXml(new FileStream(file, FileMode.Open, FileAccess.Read)); 

      if (!_dicPortStatus.ContainsKey(ps.General[0].Group)) 
      { 
       _dicPortStatus.Add(ps.General[0].Group, ps); 
      } 

      PortStatus psOrig = _dicPortStatus[ps.General[0].Group]; 

      foreach (PortStatus.PortstatusRow psr in ps.Portstatus.Rows) 
      { 
       DataRow[] drs = psOrig.Portstatus.Select("PortNumber = '" + psr.PortNumber + "'"); 

       if (drs.Length == 1) 
       { 
        DateTime curDt = DateTime.Parse(drs[0]["LastUpdateDateTimeUTC"].ToString()); 
        DateTime newDt = psr.LastUpdateDateTimeUTC; 

        if (newDt > curDt) 
        { 
         drs[0]["LastUpdateDateTimeUTC"] = newDt; 
        } 
       } 
       else if (drs.Length == 0) 
       { 
        psOrig.Portstatus.ImportRow(psr); 
       } 
       else 
       { 
        throw new Exception("More than one of the same portnumber on PortStatus file: " + file); 
       } 
      } 
     } 

     foreach (string groupName in _dicPortStatus.Keys) 
     { 
      if (!cmbGroups.Items.Contains(groupName)) 
      { 
       cmbGroups.Items.Add(groupName); 
       cmbGroups.SelectedItem = groupName; 
      } 
     } 

code:

private Dictionary<string, PortStatus> _dicPortStatus = new Dictionary<string, PortStatus>() 

Answer 1

<ComboBox Name="ComboBox1"> 
... 
<ComboBox /> 

<Label Text="{Binding ElementName=ComboBox1, Path=SelectedItem}" /> 

--EDIT--

Exemple étendu:

<StackPanel> 
     <ComboBox Name="ComboBox1" 
        DisplayMemberPath="FirstName"></ComboBox> 
     <StackPanel DataContext="{Binding ElementName=ComboBox1, Path=SelectedValue}"> 
      <Label Content="{Binding FirstName}" /> 
      <Label Content="{Binding LastName}" /> 
      <Label Content="{Binding Age}" /> 
     </StackPanel> 
    </StackPanel> 

la morue e:

 InitializeComponent(); 

     ObservableCollection<Person> persons = new ObservableCollection<Person>() { 
      new Person(){ FirstName = "John", LastName = "Doe", Age = 25 }, 
      new Person(){ FirstName = "John", LastName = "Smith", Age = 35 }, 
      new Person(){ FirstName = "Susan", LastName = "Smith", Age = 31 }, 
      new Person(){ FirstName = "Anthony", LastName = "Jones", Age = 31 }, 
     }; 

     ComboBox1.ItemsSource = persons; 

Classe:

public class Person 
{ 
    public String FirstName { get; set; } 
    public String LastName { get; set; } 
    public Int32 Age { get; set; } 
} 

--edit: 2--

Créer une nouvelle classe:

class GroupInfo 
{ 
    public String GroupName { get; set; } 
    public String IP { get; set; } 
} 

et modifiez votre code suivant:

foreach (string groupName in _dicPortStatus.Keys) 
    { 
     if (!cmbGroups.Items.Contains(groupName)) 
     { 
      cmbGroups.Items.Add(new GroupInfo(){ GroupName = groupName, IP = <Write Code to get IP>); 
      cmbGroups.SelectedItem = groupName; 
     } 
    } 

changement XAML à suivre:

<ComboBox Name="ComboBox1" DisplayMemberPath="GroupName"> 
    ... 
<ComboBox /> 

<Label Text="{Binding ElementName=ComboBox1, Path=SelectedItem.IP}" /> 

Answer 2

Salut, vous pouvez essayer quelque chose comme ça

private void ComboBox1_SelectedIndexChanged(object sender, 
    System.EventArgs e) 
{ 

    ComboBox comboBox = (ComboBox) sender; 

    string myItemText = (string) ComboBox1.SelectedItem; 

    // populate 
    MyTextBox.Text = myItemText; 

} 

Answer 3

dans Win Forms:

comboBox.SelectedIndexChanged += onSelectedIndexChanged; 

private void onSelectedIndexChanged(object sender, EventArgs e) 
{ 
    object item = comboBox.SelectedItem; 
    string text = //get text from item 
    label.Text = text; 
}