ToolboxItem 构造函数

参考

定义

命名空间:: System.Drawing.Design

程序集:: System.Drawing.dll

程序集:: System.Windows.Forms.Design.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

初始化 ToolboxItem 类的新实例。

重载

ToolboxItem()	初始化 ToolboxItem 类的新实例。
ToolboxItem(Type)	初始化 ToolboxItem 类的新实例，它将创建组件的指定类型。

示例

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

// Toolbox items must be serializable.
[Serializable]
class MyToolboxItem : ToolboxItem
{
    // The add components dialog in Visual Studio looks for a public
    // constructor that takes a type.
    public MyToolboxItem(Type toolType)
        : base(toolType)
    {
    }

    // And you must provide this special constructor for serialization.
    // If you add additional data to MyToolboxItem that you
    // want to serialize, you may override Deserialize and
    // Serialize methods to add that data.  
    MyToolboxItem(SerializationInfo info, StreamingContext context)
    {
        Deserialize(info, context);
    }

    // Let's override the creation code and pop up a dialog.
    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;
            }
        }
    }
}

<Serializable()> _
Class MyToolboxItem
    Inherits ToolboxItem

    ' The add components dialog in Visual Studio looks for a public
    ' constructor that takes a type.
    Public Sub New(ByVal toolType As Type)
        MyBase.New(toolType)
    End Sub


    ' And you must provide this special constructor for serialization.
    ' If you add additional data to MyToolboxItem that you
    ' want to serialize, you may override Deserialize and
    ' Serialize methods to add that data.  
    Sub New(ByVal info As SerializationInfo, _
        ByVal context As StreamingContext)
        Deserialize(info, context)
    End Sub


    ' Let's override the creation code and pop up a dialog.
    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
End Class

ToolboxItem()

初始化 ToolboxItem 类的新实例。

public:
 ToolboxItem();

public ToolboxItem ();

Public Sub New ()

示例

// Toolbox items must be serializable.
[Serializable]
class MyToolboxItem : ToolboxItem
{
    // The add components dialog in Visual Studio looks for a public
    // constructor that takes a type.
    public MyToolboxItem(Type toolType)
        : base(toolType)
    {
    }

    // And you must provide this special constructor for serialization.
    // If you add additional data to MyToolboxItem that you
    // want to serialize, you may override Deserialize and
    // Serialize methods to add that data.  
    MyToolboxItem(SerializationInfo info, StreamingContext context)
    {
        Deserialize(info, context);
    }

    // Let's override the creation code and pop up a dialog.
    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;
            }
        }
    }
}

<Serializable()> _
Class MyToolboxItem
    Inherits ToolboxItem

    ' The add components dialog in Visual Studio looks for a public
    ' constructor that takes a type.
    Public Sub New(ByVal toolType As Type)
        MyBase.New(toolType)
    End Sub


    ' And you must provide this special constructor for serialization.
    ' If you add additional data to MyToolboxItem that you
    ' want to serialize, you may override Deserialize and
    ' Serialize methods to add that data.  
    Sub New(ByVal info As SerializationInfo, _
        ByVal context As StreamingContext)
        Deserialize(info, context)
    End Sub


    ' Let's override the creation code and pop up a dialog.
    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
End Class

适用于

ToolboxItem(Type)

初始化 ToolboxItem 类的新实例，它将创建组件的指定类型。

public:
 ToolboxItem(Type ^ toolType);

public ToolboxItem (Type toolType);

public ToolboxItem (Type? toolType);

new System.Drawing.Design.ToolboxItem : Type -> System.Drawing.Design.ToolboxItem

Public Sub New (toolType As Type)

参数

toolType: Type

工具箱项创建的 IComponent 的类型。

例外

InvalidOperationException

ToolboxItem 已被锁定。

示例

// Toolbox items must be serializable.
[Serializable]
class MyToolboxItem : ToolboxItem
{
    // The add components dialog in Visual Studio looks for a public
    // constructor that takes a type.
    public MyToolboxItem(Type toolType)
        : base(toolType)
    {
    }

    // And you must provide this special constructor for serialization.
    // If you add additional data to MyToolboxItem that you
    // want to serialize, you may override Deserialize and
    // Serialize methods to add that data.  
    MyToolboxItem(SerializationInfo info, StreamingContext context)
    {
        Deserialize(info, context);
    }

    // Let's override the creation code and pop up a dialog.
    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;
            }
        }
    }
}

<Serializable()> _
Class MyToolboxItem
    Inherits ToolboxItem

    ' The add components dialog in Visual Studio looks for a public
    ' constructor that takes a type.
    Public Sub New(ByVal toolType As Type)
        MyBase.New(toolType)
    End Sub


    ' And you must provide this special constructor for serialization.
    ' If you add additional data to MyToolboxItem that you
    ' want to serialize, you may override Deserialize and
    ' Serialize methods to add that data.  
    Sub New(ByVal info As SerializationInfo, _
        ByVal context As StreamingContext)
        Deserialize(info, context)
    End Sub


    ' Let's override the creation code and pop up a dialog.
    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
End Class

适用于

通过

ToolboxItem 构造函数

定义

重载

示例

ToolboxItem()

示例

适用于

ToolboxItem(Type)

参数

例外

示例

适用于

其他资源