ToolboxItem Konstruktor
Definisi
Penting
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Menginisialisasi instans baru kelas ToolboxItem.
Overload
ToolboxItem() |
Menginisialisasi instans baru kelas ToolboxItem. |
ToolboxItem(Type) |
Menginisialisasi instans ToolboxItem baru kelas yang membuat jenis komponen yang ditentukan. |
Contoh
Contoh kode berikut menunjukkan penggunaan ToolboxItem konstruktor dalam kelas yang berasal dari ToolboxItem untuk implementasi item kotak alat kustom. Contoh kode ini adalah bagian dari contoh yang lebih besar yang disediakan untuk ToolboxItem kelas .
// 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()
Menginisialisasi instans baru kelas ToolboxItem.
public:
ToolboxItem();
public ToolboxItem ();
Public Sub New ()
Contoh
Contoh kode berikut menunjukkan penggunaan ToolboxItem konstruktor dalam kelas yang berasal dari ToolboxItem untuk implementasi item kotak alat kustom. Contoh kode ini adalah bagian dari contoh yang lebih besar yang disediakan untuk ToolboxItem kelas .
// 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
Berlaku untuk
ToolboxItem(Type)
Menginisialisasi instans ToolboxItem baru kelas yang membuat jenis komponen yang ditentukan.
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)
Parameter
- toolType
- Type
Jenis IComponent item kotak alat yang dibuat.
Pengecualian
Pintunya ToolboxItem terkunci.
Contoh
Contoh kode berikut menunjukkan penggunaan ToolboxItem konstruktor dalam kelas yang berasal dari ToolboxItem untuk implementasi item kotak alat kustom. Contoh kode ini adalah bagian dari contoh yang lebih besar yang disediakan untuk ToolboxItem kelas .
// 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
Berlaku untuk
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