ComboBox.Text Свойство

Определение

Возвращает или задает текст, связанный с этим элементом управления.Gets or sets the text associated with this control.

public:
 virtual property System::String ^ Text { System::String ^ get(); void set(System::String ^ value); };
[System.ComponentModel.Bindable(true)]
public override string Text { get; set; }
member this.Text : string with get, set
Public Overrides Property Text As String

Значение свойства

Текст, связанный с этим элементом управления.The text associated with this control.

Атрибуты

Примеры

В следующем примере кода показано, как инициализировать элемент управления ComboBox путем установки свойства Text и использования метода AddRange для заполнения ComboBox.The following code example demonstrates how to initialize a ComboBox control by setting the Text property and using the AddRange method to populate the ComboBox. Также демонстрируется обработка события DropDown.It also demonstrates handling the DropDown event. Чтобы выполнить пример, вставьте следующий код в форму и вызовите метод InitializeComboBox в конструкторе формы или Load событии.To run the example, paste the following code in a form and call the InitializeComboBox method in the form's constructor or Load event.

internal:
   // Declare ComboBox1
   System::Windows::Forms::ComboBox^ ComboBox1;

private:
   // Initialize ComboBox1.
   void InitializeComboBox()
   {
      this->ComboBox1 = gcnew ComboBox;
      this->ComboBox1->Location = System::Drawing::Point( 128, 48 );
      this->ComboBox1->Name = "ComboBox1";
      this->ComboBox1->Size = System::Drawing::Size( 100, 21 );
      this->ComboBox1->TabIndex = 0;
      this->ComboBox1->Text = "Typical";
      array<String^>^ installs = {"Typical","Compact","Custom"};
      ComboBox1->Items->AddRange( installs );
      this->Controls->Add( this->ComboBox1 );
      
      // Hook up the event handler.
      this->ComboBox1->DropDown += gcnew System::EventHandler(
         this, &Form1::ComboBox1_DropDown );
   }

   // Handles the ComboBox1 DropDown event. If the user expands the  
   // drop-down box, a message box will appear, recommending the
   // typical installation.
   void ComboBox1_DropDown( Object^ sender, System::EventArgs^ e )
   {
      MessageBox::Show( "Typical installation is strongly recommended.",
         "Install information", MessageBoxButtons::OK,
         MessageBoxIcon::Information );
   }

// Declare ComboBox1.
internal System.Windows.Forms.ComboBox ComboBox1;

// Initialize ComboBox1.
private void InitializeComboBox()
{
    this.ComboBox1 = new ComboBox();
    this.ComboBox1.Location = new System.Drawing.Point(128, 48);
    this.ComboBox1.Name = "ComboBox1";
    this.ComboBox1.Size = new System.Drawing.Size(100, 21);
    this.ComboBox1.TabIndex = 0;
    this.ComboBox1.Text	= "Typical";
    string[] installs = new string[]{"Typical", "Compact", "Custom"};
    ComboBox1.Items.AddRange(installs);
    this.Controls.Add(this.ComboBox1);
    
    // Hook up the event handler.
    this.ComboBox1.DropDown +=  
        new System.EventHandler(ComboBox1_DropDown);
}

// Handles the ComboBox1 DropDown event. If the user expands the  
// drop-down box, a message box will appear, recommending the
// typical installation.
private void ComboBox1_DropDown(object sender, System.EventArgs e)
{
    MessageBox.Show("Typical installation is strongly recommended.", 
    "Install information", MessageBoxButtons.OK, 
        MessageBoxIcon.Information);
}

' Declare ComboBox1.
Friend WithEvents ComboBox1 As System.Windows.Forms.ComboBox

' Initialize ComboBox1.
Private Sub InitializeComboBox()
    Me.ComboBox1 = New ComboBox
    Me.ComboBox1.Location = New System.Drawing.Point(128, 48)
    Me.ComboBox1.Name = "ComboBox1"
    Me.ComboBox1.Size = New System.Drawing.Size(100, 21)
    Me.ComboBox1.TabIndex = 0
    Me.ComboBox1.Text = "Typical"
    Dim installs() As String = New String() _
        {"Typical", "Compact", "Custom"}
    ComboBox1.Items.AddRange(installs)
    Me.Controls.Add(Me.ComboBox1)
End Sub

' Handles the ComboBox1 DropDown event. If the user expands the  
' drop-down box, a message box will appear, recommending the
' typical installation.
Private Sub ComboBox1_DropDown _ 
    (ByVal sender As Object, ByVal e As System.EventArgs) _ 
    Handles ComboBox1.DropDown
    MessageBox.Show("Typical installation is strongly recommended.", _
    "Install information", MessageBoxButtons.OK, MessageBoxIcon.Information)
End Sub

Комментарии

Присвоение свойству Text значения null или пустой строке ("") задает для SelectedIndex значение-1.Setting the Text property to null or an empty string ("") sets the SelectedIndex to -1. Присвоение свойству Text значения, которое находится в коллекции Items, задает для SelectedIndex индекс этого элемента.Setting the Text property to a value that is in the Items collection sets the SelectedIndex to the index of that item. Присвоение свойству Text значения, не находящийся в коллекции, оставляет SelectedIndex неизменной.Setting the Text property to a value that is not in the collection leaves the SelectedIndex unchanged.

Применяется к