ToolStripDropDownItem.HasDropDownItems 屬性

定義

命名空間:

System.Windows.Forms

組件:

System.Windows.Forms.dll

取得值，指出 ToolStripDropDownItem 是否有關聯的 ToolStripDropDown 控制項。

public:
 virtual property bool HasDropDownItems { bool get(); };

[System.ComponentModel.Browsable(false)]
public virtual bool HasDropDownItems { get; }

[<System.ComponentModel.Browsable(false)>]
member this.HasDropDownItems : bool

Public Overridable ReadOnly Property HasDropDownItems As Boolean

屬性值

Boolean

如果 ToolStripDropDownItem 有 ToolStripDropDown 控制項，則為 true，否則為 false。

屬性

BrowsableAttribute

範例

下列程式碼範例示範如何查詢 HasDropDownItems 屬性，以有條件地顯示 ToolStripDropDownItem 控制項。 此程式碼範例是針對 類別提供的較大範例的 ToolStripDropDownItem 一部分。

// This method shows the drop-down for the first item
// in the form's ToolStrip.
private void showButton_Click(object sender, EventArgs e)
{
    ToolStripDropDownItem item = this.toolStrip1.Items[0] as ToolStripDropDownItem;

    if (item.HasDropDownItems)
    {
        item.ShowDropDown();
    }
}

' This method shows the drop-down for the first item
' in the form's ToolStrip.
 Private Sub showButton_Click( _
 ByVal sender As Object, _
 ByVal e As EventArgs) _
 Handles showButton.Click

     Dim item As ToolStripDropDownItem = CType(Me.toolStrip1.Items(0), ToolStripDropDownItem)

     If item.HasDropDownItems Then
         item.ShowDropDown()
     End If

 End Sub