DomainUpDown.DomainUpDownItemCollection.Add(Object) 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
將指定的物件加入至集合的尾端。
public:
override int Add(System::Object ^ item);public override int Add (object item);override this.Add : obj -> intPublic Overrides Function Add (item As Object) As Integer參數
傳回
加入集合之 Object 以零為起始的索引值。
範例
下列範例會建立並初始化 DomainUpDown 控制項。 此範例可讓您設定其部分屬性，並建立字串集合以顯示在上下控制項中。 程式碼假設 TextBox 已在表單上具現化 、 CheckBox 和 Button 。 此範例也假設您在類別層級宣告為名為 myCounter 的 32 位帶正負號整數的成員變數。 您可以在文字方塊中輸入字串，並在按一下按鈕時將其新增至 Items 集合。 按一下核取方塊，您可以切換 屬性， Sorted 並觀察向上控制項中專案集合的差異。
protected:
DomainUpDown^ domainUpDown1;
private:
void InitializeMyDomainUpDown()
{
// Create and initialize the DomainUpDown control.
domainUpDown1 = gcnew DomainUpDown;
// Add the DomainUpDown control to the form.
Controls->Add( domainUpDown1 );
}
void button1_Click( Object^ sender,
EventArgs^ e )
{
// Add the text box contents and initial location in the collection
// to the DomainUpDown control.
domainUpDown1->Items->Add( String::Concat(
(textBox1->Text->Trim()), " - ", myCounter ) );
// Increment the counter variable.
myCounter = myCounter + 1;
// Clear the TextBox.
textBox1->Text = "";
}
void checkBox1_Click( Object^ sender,
EventArgs^ e )
{
// If Sorted is set to true, set it to false;
// otherwise set it to true.
domainUpDown1->Sorted = !domainUpDown1->Sorted;
}
void domainUpDown1_SelectedItemChanged( Object^ sender,
EventArgs^ e )
{
// Display the SelectedIndex and
// SelectedItem property values in a MessageBox.
MessageBox::Show( String::Concat( "SelectedIndex: ", domainUpDown1->SelectedIndex,
"\nSelectedItem: ", domainUpDown1->SelectedItem ) );
}
protected DomainUpDown domainUpDown1;
private void InitializeMyDomainUpDown()
{
// Create and initialize the DomainUpDown control.
domainUpDown1 = new DomainUpDown();
// Add the DomainUpDown control to the form.
Controls.Add(domainUpDown1);
}
private void button1_Click(Object sender,
EventArgs e)
{
// Add the text box contents and initial location in the collection
// to the DomainUpDown control.
domainUpDown1.Items.Add((textBox1.Text.Trim()) + " - " + myCounter);
// Increment the counter variable.
myCounter = myCounter + 1;
// Clear the TextBox.
textBox1.Text = "";
}
private void checkBox1_Click(Object sender,
EventArgs e)
{
// If Sorted is set to true, set it to false;
// otherwise set it to true.
if (domainUpDown1.Sorted)
{
domainUpDown1.Sorted = false;
}
else
{
domainUpDown1.Sorted = true;
}
}
private void domainUpDown1_SelectedItemChanged(Object sender,
EventArgs e)
{
// Display the SelectedIndex and
// SelectedItem property values in a MessageBox.
MessageBox.Show("SelectedIndex: " + domainUpDown1.SelectedIndex.ToString()
+ "\n" + "SelectedItem: " + domainUpDown1.SelectedItem.ToString());
}
Protected domainUpDown1 As DomainUpDown
Private Sub InitializeMyDomainUpDown()
' Create and initialize the DomainUpDown control.
domainUpDown1 = New DomainUpDown()
' Add the DomainUpDown control to the form.
Controls.Add(domainUpDown1)
End Sub
Private Sub button1_Click(sender As Object, e As EventArgs)
' Add the text box contents and initial location in the collection
' to the DomainUpDown control.
domainUpDown1.Items.Add((textBox1.Text.Trim() & " - " & myCounter))
' Increment the counter variable.
myCounter = myCounter + 1
' Clear the TextBox.
textBox1.Text = ""
End Sub
Private Sub checkBox1_Click(sender As Object, e As EventArgs)
' If Sorted is set to true, set it to false;
' otherwise set it to true.
If domainUpDown1.Sorted Then
domainUpDown1.Sorted = False
Else
domainUpDown1.Sorted = True
End If
End Sub
Private Sub domainUpDown1_SelectedItemChanged _
(sender As Object, e As EventArgs)
' Display the SelectedIndex and
' SelectedItem property values in a MessageBox.
MessageBox.Show(("SelectedIndex: " & domainUpDown1.SelectedIndex.ToString() & _
ControlChars.Cr & "SelectedItem: " & domainUpDown1.SelectedItem.ToString()))
End Sub
備註
您也可以使用 Insert 方法，將新的 Object 新增至集合。
若要移除您先前新增的 Object ，請使用 Remove 或 RemoveAt 方法。
