Adds an item with the specified string to the combo box.

Namespace:  ESRI.ArcGIS.Desktop.AddIns

Assembly:  ESRI.ArcGIS.Desktop.Addins (in ESRI.ArcGIS.Desktop.Addins.dll) Version: 10.0.0.0 (10.0.0.0)

Syntax

C#
protected int Add(
	string str
)
Visual Basic (Declaration)
Protected Function Add ( _
	str As String _
) As Integer
Visual C++
protected:
int Add(
	String^ str
)

Parameters

str
Type: System..::.String

The specified string as the combo box item.

Return Value

The unique cookie that corresponds to the current item.

Remarks

Use the overload function Add(string str, object tag) to associate object with the item.

Examples

The code below shows the implementation of a simple combo box.
CopyC#
public class Combo1 : ESRI.ArcGIS.Desktop.AddIns.ComboBox
{
  public Combo1()
  {
    //Add two items to the combo box.
    Point o1 = new Point();
    o1.PutCoords(0, 0);
    int c1 = this.Add("Item1", o1);

    Point o2 = new Point();
    o2.PutCoords(1, 1);
    int c2 = this.Add("Item2", o2);

    //Add the application's caption.
    ESRI.ArcGIS.Framework.IApplication app = this.Hook as ESRI.ArcGIS.Framework.IApplication;
    this.Add(app.Caption);

    //Add one item then remove
    int c3 = this.Add("Item3");
    this.Remove(c3);

    //Select the second item.
    this.Select(c2);
  }

  protected override void OnSelChange(int cookie)
  {
    if (cookie == -1)
      return;

    //Get the associated object.
    Point tag = this.GetItem(cookie).Tag as Point;
    if (tag != null)
    {
      System.Windows.Forms.MessageBox.Show(tag.X + ", " + tag.Y);
    }
  }

  protected override void OnEnter()
  {
    //Loop through the item collection.
    foreach (ESRI.ArcGIS.Desktop.AddIns.ComboBox.Item item in this.items)
    {
      if (this.Value == item.Caption)
        return;
    }
    this.Add(this.Value);
  }

  protected override void OnEditChange(string editString)
  {
    if (string.Compare(editString, "ABC", true) == 0)
    {
      System.Windows.Forms.MessageBox.Show("editString is " + this.Value);
    }
  }

  protected override void OnFocus(bool set)
  {
    if (set)
      System.Diagnostics.Debug.WriteLine("Get focus.");

    if (!set)
      System.Diagnostics.Debug.WriteLine("Lose focus.");
  }

  protected override void OnUpdate()
  {
    this.Enabled = ArcMap.Application != null;
  }
}
CopyVB.NET
Public Class Combo1
  Inherits ESRI.ArcGIS.Desktop.AddIns.ComboBox
  Public Sub New()
    'Add two items to the combo box. 
    Dim o1 As New Point()
    o1.PutCoords(0, 0)
    Dim c1 As Integer = Me.Add("Item1", o1)

    Dim o2 As New Point()
    o2.PutCoords(1, 1)
    Dim c2 As Integer = Me.Add("Item2", o2)

    'Add the application's caption. 
    Dim app As ESRI.ArcGIS.Framework.IApplication = TryCast(Me.Hook, ESRI.ArcGIS.Framework.IApplication)
    Me.Add(app.Caption)

    'Add one item then remove 
    Dim c3 As Integer = Me.Add("Item3")
    Me.Remove(c3)

    'Select the second item. 
    Me.[Select](c2)
  End Sub

  Protected Overloads Overrides Sub OnSelChange(ByVal cookie As Integer)
    If cookie = -1 Then
      Exit Sub
    End If

    'Get the associated object. 
    Dim tag As Point = TryCast(Me.GetItem(cookie).Tag, Point)
    If tag IsNot Nothing Then
      System.Windows.Forms.MessageBox.Show((tag.X & ", ") + tag.Y)
    End If
  End Sub

  Protected Overloads Overrides Sub OnEnter()
    'Loop through the item collection. 
    For Each item As ESRI.ArcGIS.Desktop.AddIns.ComboBox.Item In Me.items
      If Me.Value = item.Caption Then
        Exit Sub
      End If
    Next
    Me.Add(Me.Value)
  End Sub

  Protected Overloads Overrides Sub OnEditChange(ByVal editString As String)
    If String.Compare(editString, "ABC", True) = 0 Then
      System.Windows.Forms.MessageBox.Show("editString is " & Me.Value)
    End If
  End Sub

  Protected Overloads Overrides Sub OnFocus(ByVal [set] As Boolean)
    If [set] Then
      System.Diagnostics.Debug.WriteLine("Get focus.")
    End If

    If Not [set] Then
      System.Diagnostics.Debug.WriteLine("Lose focus.")
    End If
  End Sub

  Protected Overloads Overrides Sub OnUpdate()
    Me.Enabled = ArcMap.Application IsNot Nothing
  End Sub
End Class

See Also