ToolboxItem.CreateComponentsCore 方法

定义

命名空间:

System.Drawing.Design

程序集:

System.Windows.Forms.Design.dll

调用工具箱项时创建组件或者组件数组。

重载

CreateComponentsCore(IDesignerHost)	调用工具箱项时创建组件或者组件数组。
CreateComponentsCore(IDesignerHost, IDictionary)	调用工具箱项时创建组件数组。

CreateComponentsCore(IDesignerHost)

调用工具箱项时创建组件或者组件数组。

protected:
 virtual cli::array <System::ComponentModel::IComponent ^> ^ CreateComponentsCore(System::ComponentModel::Design::IDesignerHost ^ host);

protected virtual System.ComponentModel.IComponent[] CreateComponentsCore (System.ComponentModel.Design.IDesignerHost host);

abstract member CreateComponentsCore : System.ComponentModel.Design.IDesignerHost -> System.ComponentModel.IComponent[]
override this.CreateComponentsCore : System.ComponentModel.Design.IDesignerHost -> System.ComponentModel.IComponent[]

Protected Overridable Function CreateComponentsCore (host As IDesignerHost) As IComponent()

参数

host

IDesignerHost

要承载工具箱项的 IDesignerHost。

返回

IComponent[]

创建的 IComponent 对象数组。

注解

如果 host 不是 null，该方法 CreateComponentsCore 会将新组件添加到设计器。

继承者说明

可以重写 方法以 CreateComponentsCore(IDesignerHost) 返回工具箱项创建的一个或多个组件。

另请参阅

• IDesignerHost

CreateComponentsCore(IDesignerHost, IDictionary)

调用工具箱项时创建组件数组。

protected:
 virtual cli::array <System::ComponentModel::IComponent ^> ^ CreateComponentsCore(System::ComponentModel::Design::IDesignerHost ^ host, System::Collections::IDictionary ^ defaultValues);

protected virtual System.ComponentModel.IComponent[] CreateComponentsCore (System.ComponentModel.Design.IDesignerHost host, System.Collections.IDictionary defaultValues);

abstract member CreateComponentsCore : System.ComponentModel.Design.IDesignerHost * System.Collections.IDictionary -> System.ComponentModel.IComponent[]
override this.CreateComponentsCore : System.ComponentModel.Design.IDesignerHost * System.Collections.IDictionary -> System.ComponentModel.IComponent[]

Protected Overridable Function CreateComponentsCore (host As IDesignerHost, defaultValues As IDictionary) As IComponent()

参数

host

IDesignerHost

创建组件时要使用的设计器宿主。

defaultValues

IDictionary

初始化组件时所用的默认值的属性名称/值对字典。

返回

IComponent[]

创建的 IComponent 对象数组。

示例

下面的代码示例演示如何在派生自 ToolboxItem 的CreateComponentsCore类中对自定义工具箱项实现使用 方法。 此代码示例是为 ToolboxItem 类提供的一个更大示例的一部分。

protected override IComponent[] CreateComponentsCore(
    System.ComponentModel.Design.IDesignerHost host, 
    System.Collections.IDictionary defaultValues)
{
    // Get the string we want to fill in the custom
    // user control.  If the user cancels out of the dialog,
    // return null or an empty array to signify that the 
    // tool creation was canceled.
    using (ToolboxItemDialog d = new ToolboxItemDialog())
    {
        if (d.ShowDialog() == DialogResult.OK)
        {
            string text = d.CreationText;

            IComponent[] comps =
                base.CreateComponentsCore(host, defaultValues);
            // comps will have a single component: our data type.
            ((UserControl1)comps[0]).LabelText = text;
            return comps;
        }
        else
        {
            return null;
        }
    }
}

Protected Overrides Function CreateComponentsCore( _
    ByVal host As System.ComponentModel.Design.IDesignerHost, _
    ByVal defaultValues As System.Collections.IDictionary) _
    As IComponent()
    ' Get the string we want to fill in the custom
    ' user control.  If the user cancels out of the dialog,
    ' return null or an empty array to signify that the 
    ' tool creation was canceled.
    Using d As New ToolboxItemDialog()
        If d.ShowDialog() = DialogResult.OK Then
            Dim [text] As String = d.CreationText
            Dim comps As IComponent() = _
                MyBase.CreateComponentsCore(host, defaultValues)
            ' comps will have a single component: our data type.
            CType(comps(0), UserControl1).LabelText = [text]
            Return comps
        Else
            Return Nothing
        End If
    End Using
End Function

注解

如果 host 不是 null，该方法 CreateComponentsCore 会将新组件添加到设计器。