ToolboxItemFilterAttribute Class
 

Specifies the filter string and filter type to use for a toolbox item.

Namespace:   System.ComponentModel
Assembly:  System (in System.dll)

SystemObject
   SystemAttribute
    System.ComponentModelToolboxItemFilterAttribute

[SerializableAttribute]
[AttributeUsageAttribute(AttributeTargets.Class, AllowMultiple = true, 
	Inherited = true)]
public sealed class ToolboxItemFilterAttribute : Attribute
[SerializableAttribute]
[AttributeUsageAttribute(AttributeTargets::Class, AllowMultiple = true, 
	Inherited = true)]
public ref class ToolboxItemFilterAttribute sealed : Attribute
[<Sealed>]
[<SerializableAttribute>]
[<AttributeUsageAttribute(AttributeTargets.Class, AllowMultiple = true,
    Inherited = true)>]
type ToolboxItemFilterAttribute = 
    class
        inherit Attribute
    end
<SerializableAttribute>
<AttributeUsageAttribute(AttributeTargets.Class, AllowMultiple := True,
	Inherited := True)>
Public NotInheritable Class ToolboxItemFilterAttribute
	Inherits Attribute
NameDescription
System_CAPS_pubmethod ToolboxItemFilterAttribute

Initializes a new instance of the ToolboxItemFilterAttribute class using the specified filter string.

System_CAPS_pubmethod ToolboxItemFilterAttribute

Initializes a new instance of the ToolboxItemFilterAttribute class using the specified filter string and type.

NameDescription
System_CAPS_pubproperty

Gets the filter string for the toolbox item.

System_CAPS_pubproperty

Gets the type of the filter.

System_CAPS_pubproperty

Gets the type ID for the attribute.(Overrides .)

NameDescription
System_CAPS_pubmethod Equals

Returns a value that indicates whether this instance is equal to a specified object.(Overrides AttributeEquals.)

System_CAPS_pubmethod GetHashCode

Returns the hash code for this instance.(Overrides AttributeGetHashCode.)

System_CAPS_pubmethod GetType

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethod IsDefaultAttribute

When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)

System_CAPS_pubmethod Match

Indicates whether the specified object has a matching filter string.(Overrides AttributeMatch.)

System_CAPS_pubmethod ToString

Returns a string that represents the current object.(Overrides ObjectToString.)

NameDescription
System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetIDsOfNames

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfo

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeGetTypeInfoCount

Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterface System_CAPS_privmethod _AttributeInvoke

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

ToolboxItemFilterAttribute provides a mechanism by which toolbox items can be marked for use only with designers that have a matching attribute or code that determines whether the item should be enabled or disabled in the toolbox.

A ToolboxItemFilterAttribute can be applied to a ToolboxItem to indicate a filter string and filter type that specify when to enable or disable the item. ToolboxItemFilterAttribute can also be applied to a designer to indicate its requirements for enabling items in the toolbox. This type of attribute can be used to indicate that a toolbox item can only be enabled when a designer with a matching filter string is being used. The type of the filter is indicated in the property by a ToolboxItemFilterType that indicates whether and how a filter string match is used, or whether to use custom code to determine whether to enable an item.

The following code example demonstrates how to apply the ToolboxItemFilterAttribute.

using System;
using System.Collections;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;

// This example contains an IRootDesigner that implements the IToolboxUser interface.
// This example demonstrates how to enable the GetToolSupported method of an IToolboxUser
// designer in order to disable specific toolbox items, and how to respond to the 
// invocation of a ToolboxItem in the ToolPicked method of an IToolboxUser implementation.
namespace IToolboxUserExample
{
    // This example component class demonstrates the associated IRootDesigner which 
    // implements the IToolboxUser interface. When designer view is invoked, Visual 
    // Studio .NET attempts to display a design mode view for the class at the top 
    // of a code file. This can sometimes fail when the class is one of multiple types 
    // in a code file, and has a DesignerAttribute associating it with an IRootDesigner. 
    // Placing a derived class at the top of the code file solves this problem. A 
    // derived class is not typically needed for this reason, except that placing the 
    // RootDesignedComponent class in another file is not a simple solution for a code 
    // example that is packaged in one segment of code.
    public class RootViewSampleComponent : RootDesignedComponent
	{
	}

	// The following attribute associates the SampleRootDesigner with this example component.
	[DesignerAttribute(typeof(SampleRootDesigner), typeof(IRootDesigner))]
	public class RootDesignedComponent : System.Windows.Forms.Control
	{
	}

    // This example IRootDesigner implements the IToolboxUser interface and provides a 
    // Windows Forms view technology view for its associated component using an internal 
    // Control type.     
    // The following ToolboxItemFilterAttribute enables the GetToolSupported method of this
    // IToolboxUser designer to be queried to check for whether to enable or disable all 
    // ToolboxItems which create any components whose type name begins with "System.Windows.Forms".
    [ToolboxItemFilterAttribute("System.Windows.Forms", ToolboxItemFilterType.Custom)]
    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")] 
    public class SampleRootDesigner : ParentControlDesigner, IRootDesigner, IToolboxUser
    {
        // This field is a custom Control type named RootDesignerView. This field references
        // a control that is shown in the design mode document window.
        private RootDesignerView view;

        // This string array contains type names of components that should not be added to 
        // the component managed by this designer from the Toolbox.  Any ToolboxItems whose 
        // type name matches a type name in this array will be marked disabled according to  
        // the signal returned by the IToolboxUser.GetToolSupported method of this designer.
        private string[] blockedTypeNames =
        {
            "System.Windows.Forms.ListBox",
            "System.Windows.Forms.GroupBox"
        };

        // IRootDesigner.SupportedTechnologies is a required override for an IRootDesigner.
        // This designer provides a display using the Windows Forms view technology.
        ViewTechnology[] IRootDesigner.SupportedTechnologies 
        {
            get { return new ViewTechnology[] {ViewTechnology.Default}; }
        }

        // This method returns an object that provides the view for this root designer. 
        object IRootDesigner.GetView(ViewTechnology technology) 
        {
            // If the design environment requests a view technology other than Windows 
            // Forms, this method throws an Argument Exception.
            if (technology != ViewTechnology.Default)            
                throw new ArgumentException("An unsupported view technology was requested", 
                "Unsupported view technology.");            

            // Creates the view object if it has not yet been initialized.
            if (view == null)                            
                view = new RootDesignerView(this);          

            return view;
        }

        // This method can signal whether to enable or disable the specified
        // ToolboxItem when the component associated with this designer is selected.
        bool IToolboxUser.GetToolSupported(ToolboxItem tool)
        {       
            // Search the blocked type names array for the type name of the tool
            // for which support for is being tested. Return false to indicate the
            // tool should be disabled when the associated component is selected.
            for( int i=0; i<blockedTypeNames.Length; i++ )
                if( tool.TypeName == blockedTypeNames[i] )
                    return false;

            // Return true to indicate support for the tool, if the type name of the
            // tool is not located in the blockedTypeNames string array.
            return true;
        }

        // This method can perform behavior when the specified tool has been invoked.
        // Invocation of a ToolboxItem typically creates a component or components, 
        // and adds any created components to the associated component.
        void IToolboxUser.ToolPicked(ToolboxItem tool)
        {
        }

        // This control provides a Windows Forms view technology view object that 
        // provides a display for the SampleRootDesigner.
        [DesignerAttribute(typeof(ParentControlDesigner), typeof(IDesigner))]
        internal class RootDesignerView : Control
        {
            // This field stores a reference to a designer.
            private IDesigner m_designer;

            public RootDesignerView(IDesigner designer)
            {
                // Perform basic control initialization.
                m_designer = designer;
                BackColor = Color.Blue;
                Font = new Font(Font.FontFamily.Name, 24.0f);                
            }

            // This method is called to draw the view for the SampleRootDesigner.
            protected override void OnPaint(PaintEventArgs pe)
            {
                base.OnPaint(pe);
                // Draw the name of the component in large letters.
                pe.Graphics.DrawString(m_designer.Component.Site.Name, Font, Brushes.Yellow, ClientRectangle);
            }
        }
    }
}
Imports System
Imports System.Collections
Imports System.ComponentModel
Imports System.ComponentModel.Design
Imports System.Diagnostics
Imports System.Drawing
Imports System.Drawing.Design
Imports System.Windows.Forms
Imports System.Windows.Forms.Design

' This example contains an IRootDesigner that implements the IToolboxUser interface.
' This example demonstrates how to enable the GetToolSupported method of an IToolboxUser
' designer in order to disable specific toolbox items, and how to respond to the 
' invocation of a ToolboxItem in the ToolPicked method of an IToolboxUser implementation.
' This example component class demonstrates the associated IRootDesigner which 
' implements the IToolboxUser interface. When designer view is invoked, Visual 
' Studio .NET attempts to display a design mode view for the class at the top 
' of a code file. This can sometimes fail when the class is one of multiple types 
' in a code file, and has a DesignerAttribute associating it with an IRootDesigner. 
' Placing a derived class at the top of the code file solves this problem. A 
' derived class is not typically needed for this reason, except that placing the 
' RootDesignedComponent class in another file is not a simple solution for a code 
' example that is packaged in one segment of code.

Public Class RootViewSampleComponent
    Inherits RootDesignedComponent
End Class

' The following attribute associates the SampleRootDesigner with this example component.
<DesignerAttribute(GetType(SampleRootDesigner), GetType(IRootDesigner))> _
Public Class RootDesignedComponent
    Inherits System.Windows.Forms.Control
End Class

' This example IRootDesigner implements the IToolboxUser interface and provides a 
' Windows Forms view technology view for its associated component using an internal 
' Control type.     
' The following ToolboxItemFilterAttribute enables the GetToolSupported method of this
' IToolboxUser designer to be queried to check for whether to enable or disable all 
' ToolboxItems which create any components whose type name begins with "System.Windows.Forms".
<ToolboxItemFilterAttribute("System.Windows.Forms", ToolboxItemFilterType.Custom)> _
<System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
Public Class SampleRootDesigner
    Inherits ParentControlDesigner
    Implements IRootDesigner, IToolboxUser

    ' Member field of custom type RootDesignerView, a control that is shown in the 
    ' design mode document window. This member is cached to reduce processing needed 
    ' to recreate the view control on each call to GetView().
    Private m_view As RootDesignerView

    ' This string array contains type names of components that should not be added to 
    ' the component managed by this designer from the Toolbox.  Any ToolboxItems whose 
    ' type name matches a type name in this array will be marked disabled according to  
    ' the signal returned by the IToolboxUser.GetToolSupported method of this designer.
    Private blockedTypeNames As String() = {"System.Windows.Forms.ListBox", "System.Windows.Forms.GroupBox"}

    ' IRootDesigner.SupportedTechnologies is a required override for an IRootDesigner.
    ' This designer provides a display using the Windows Forms view technology.
    ReadOnly Property SupportedTechnologies() As ViewTechnology() Implements IRootDesigner.SupportedTechnologies
        Get
            Return New ViewTechnology() {ViewTechnology.Default}
        End Get
    End Property

    ' This method returns an object that provides the view for this root designer. 
    Function GetView(ByVal technology As ViewTechnology) As Object Implements IRootDesigner.GetView
        ' If the design environment requests a view technology other than Windows 
        ' Forms, this method throws an Argument Exception.
        If technology <> ViewTechnology.Default Then
            Throw New ArgumentException("An unsupported view technology was requested", "Unsupported view technology.")
        End If

        ' Creates the view object if it has not yet been initialized.
        If m_view Is Nothing Then
            m_view = New RootDesignerView(Me)
        End If
        Return m_view
    End Function

    ' This method can signal whether to enable or disable the specified
    ' ToolboxItem when the component associated with this designer is selected.
    Function GetToolSupported(ByVal tool As ToolboxItem) As Boolean Implements IToolboxUser.GetToolSupported
        ' Search the blocked type names array for the type name of the tool
        ' for which support for is being tested. Return false to indicate the
        ' tool should be disabled when the associated component is selected.
        Dim i As Integer
        For i = 0 To blockedTypeNames.Length - 1
            If tool.TypeName = blockedTypeNames(i) Then
                Return False
            End If
        Next i ' Return true to indicate support for the tool, if the type name of the
        ' tool is not located in the blockedTypeNames string array.
        Return True
    End Function

    ' This method can perform behavior when the specified tool has been invoked.
    ' Invocation of a ToolboxItem typically creates a component or components, 
    ' and adds any created components to the associated component.
    Sub ToolPicked(ByVal tool As ToolboxItem) Implements IToolboxUser.ToolPicked
    End Sub

    ' This control provides a Windows Forms view technology view object that 
    ' provides a display for the SampleRootDesigner.
    <DesignerAttribute(GetType(ParentControlDesigner), GetType(IDesigner))> _
    Friend Class RootDesignerView
        Inherits Control
        ' This field stores a reference to a designer.
        Private m_designer As IDesigner

        Public Sub New(ByVal designer As IDesigner)
            ' Performs basic control initialization.
            m_designer = designer
            BackColor = Color.Blue
            Font = New Font(Font.FontFamily.Name, 24.0F)
        End Sub

        ' This method is called to draw the view for the SampleRootDesigner.
        Protected Overrides Sub OnPaint(ByVal pe As PaintEventArgs)
            MyBase.OnPaint(pe)
            ' Draws the name of the component in large letters.
            pe.Graphics.DrawString(m_designer.Component.Site.Name, Font, Brushes.Yellow, New RectangleF(ClientRectangle.X, ClientRectangle.Y, ClientRectangle.Width, ClientRectangle.Height))
        End Sub
    End Class
End Class
#using <System.Drawing.dll>
#using <System.dll>
#using <System.Design.dll>
#using <System.Windows.Forms.dll>

using namespace System;
using namespace System::Collections;
using namespace System::ComponentModel;
using namespace System::ComponentModel::Design;
using namespace System::Diagnostics;
using namespace System::Drawing;
using namespace System::Drawing::Design;
using namespace System::Windows::Forms;
using namespace System::Windows::Forms::Design;

// This example contains an IRootDesigner that implements the IToolboxUser interface.
// This example demonstrates how to enable the GetToolSupported method of an IToolboxUser
// designer in order to disable specific toolbox items, and how to respond to the 
// invocation of a ToolboxItem in the ToolPicked method of an IToolboxUser implementation.
public ref class SampleRootDesigner;

// The following attribute associates the SampleRootDesigner with this example component.

[DesignerAttribute(__typeof(SampleRootDesigner),__typeof(IRootDesigner))]
public ref class RootDesignedComponent: public Control{};


// This example component class demonstrates the associated IRootDesigner which 
// implements the IToolboxUser interface. When designer view is invoked, Visual 
// Studio .NET attempts to display a design mode view for the class at the top 
// of a code file. This can sometimes fail when the class is one of multiple types 
// in a code file, and has a DesignerAttribute associating it with an IRootDesigner. 
// Placing a derived class at the top of the code file solves this problem. A 
// derived class is not typically needed for this reason, except that placing the 
// RootDesignedComponent class in another file is not a simple solution for a code 
// example that is packaged in one segment of code.
public ref class RootViewSampleComponent: public RootDesignedComponent{};


// This example IRootDesigner implements the IToolboxUser interface and provides a 
// Windows Forms view technology view for its associated component using an internal 
// Control type.     
// The following ToolboxItemFilterAttribute enables the GetToolSupported method of this
// IToolboxUser designer to be queried to check for whether to enable or disable all 
// ToolboxItems which create any components whose type name begins with "System.Windows.Forms".

[ToolboxItemFilterAttribute(S"System.Windows.Forms",ToolboxItemFilterType::Custom)]
public ref class SampleRootDesigner: public ParentControlDesigner, public IRootDesigner, public IToolboxUser
{
public private:
   ref class RootDesignerView;

private:

   // This field is a custom Control type named RootDesignerView. This field references
   // a control that is shown in the design mode document window.
   RootDesignerView^ view;

   // This string array contains type names of components that should not be added to 
   // the component managed by this designer from the Toolbox.  Any ToolboxItems whose 
   // type name matches a type name in this array will be marked disabled according to  
   // the signal returned by the IToolboxUser.GetToolSupported method of this designer.
   array<String^>^blockedTypeNames;

public:
   SampleRootDesigner()
   {
      array<String^>^tempTypeNames = {"System.Windows.Forms.ListBox","System.Windows.Forms.GroupBox"};
      blockedTypeNames = tempTypeNames;
   }


private:

   property array<ViewTechnology>^ SupportedTechnologies 
   {

      // IRootDesigner.SupportedTechnologies is a required override for an IRootDesigner.
      // This designer provides a display using the Windows Forms view technology.
      array<ViewTechnology>^ IRootDesigner::get()
      {
         ViewTechnology temp0[] = {ViewTechnology::WindowsForms};
         return temp0;
      }

   }

   // This method returns an object that provides the view for this root designer. 
   Object^ IRootDesigner::GetView( ViewTechnology technology )
   {

      // If the design environment requests a view technology other than Windows 
      // Forms, this method throws an Argument Exception.
      if ( technology != ViewTechnology::WindowsForms )
            throw gcnew ArgumentException( "An unsupported view technology was requested","Unsupported view technology." );


      // Creates the view object if it has not yet been initialized.
      if ( view == nullptr )
            view = gcnew RootDesignerView( this );

      return view;
   }


   // This method can signal whether to enable or disable the specified
   // ToolboxItem when the component associated with this designer is selected.
   bool IToolboxUser::GetToolSupported( ToolboxItem^ tool )
   {

      // Search the blocked type names array for the type name of the tool
      // for which support for is being tested. Return false to indicate the
      // tool should be disabled when the associated component is selected.
      for ( int i = 0; i < blockedTypeNames->Length; i++ )
         if ( tool->TypeName == blockedTypeNames[ i ] )
                  return false;


      // Return true to indicate support for the tool, if the type name of the
      // tool is not located in the blockedTypeNames string array.
      return true;
   }


   // This method can perform behavior when the specified tool has been invoked.
   // Invocation of a ToolboxItem typically creates a component or components, 
   // and adds any created components to the associated component.
   void IToolboxUser::ToolPicked( ToolboxItem^ /*tool*/ ){}


public private:

   // This control provides a Windows Forms view technology view object that 
   // provides a display for the SampleRootDesigner.

   [DesignerAttribute(__typeof(ParentControlDesigner),__typeof(IDesigner))]
   ref class RootDesignerView: public Control
   {
   private:

      // This field stores a reference to a designer.
      IDesigner^ m_designer;

   public:
      RootDesignerView( IDesigner^ designer )
      {

         // Perform basic control initialization.
         m_designer = designer;
         BackColor = Color::Blue;
         Font = gcnew System::Drawing::Font( Font->FontFamily->Name,24.0f );
      }


   protected:

      // This method is called to draw the view for the SampleRootDesigner.
      void OnPaint( PaintEventArgs^ pe )
      {
         Control::OnPaint( pe );

         // Draw the name of the component in large letters.
         pe->Graphics->DrawString( m_designer->Component->Site->Name, Font, Brushes::Yellow, ClientRectangle );
      }

   };


};
.NET Framework
Available since 1.1

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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