ViewTechnology 枚举

定义

命名空间:

System.ComponentModel.Design

程序集:

System.ComponentModel.TypeConverter.dll

定义设计器宿主所支持的技术集的标识符。

C#

public enum ViewTechnology

继承

Object

ValueType

Enum

ViewTechnology

字段

名称	值	说明
Default	2	指定默认的视图技术支持。 根设计器可以返回任何类型的对象，但该对象必须与用于宿主技术的适配器兼容。 诸如 Visual Studio 之类的托管环境提供了一种插入新视图技术适配器的方法。 Windows 窗体设计器的默认视图对象是 Control 实例。
Passthrough	0	表示将视图对象直接传递给开发环境的模式。 视图对象必须实现开发环境所需的任何接口。 Visual Studio 开发环境支持以下视图对象：ActiveX 控件、活动文档，或实现 IVsWindowPane 接口的对象，该接口通过 Visual Studio VSI（Visual Studio 集成）程序提供。 Visual Studio 开发环境为此视图技术提供支持。 并非所有开发环境都支持此视图技术。
WindowsForms	1	表示由 Windows 窗体控件对象为根设计器提供显示的模式。 设计器宿主使用 Windows 窗体控件填充开发环境文档窗口。

示例

以下示例演示如何 ViewTechnology.Default 在设计器中使用 。 此示例是为 接口提供的更大示例的 GetView 一部分。

C#

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

namespace SampleRootDesigner
{	
    // This sample demonstrates how to provide the root designer view, or
    // design mode background view, by overriding IRootDesigner.GetView().

    // This sample component inherits from RootDesignedComponent which 
    // uses the SampleRootDesigner.
    public class RootViewSampleComponent : RootDesignedComponent
    {
        public RootViewSampleComponent()
        {
        }
    }

    // The following attribute associates the SampleRootDesigner designer 
    // with the SampleComponent component.
    [Designer(typeof(SampleRootDesigner), typeof(IRootDesigner))]
    public class RootDesignedComponent : Component
    {
        public RootDesignedComponent()
        {
        }
    }

    public class SampleRootDesigner : ComponentDesigner, IRootDesigner
    {
        // Member field of custom type RootDesignerView, a control that 
        // will be shown in the Forms designer view. This member is 
        // cached to reduce processing needed to recreate the 
        // view control on each call to GetView().
        private RootDesignerView m_view;			

        // This method returns an instance of the view for this root
        // designer. The "view" is the user interface that is presented
        // in a document window for the user to manipulate. 
        object IRootDesigner.GetView(ViewTechnology technology) 
        {
            if (technology != ViewTechnology.Default)
            {
                throw new ArgumentException("Not a supported view technology", "technology");
            }
            if (m_view == null)
            {
                   // Some type of displayable Form or control is required 
                   // for a root designer that overrides GetView(). In this 
                   // example, a Control of type RootDesignerView is used.
                   // Any class that inherits from Control will work.
                m_view = new RootDesignerView(this);
            }
            return m_view;
        }

        // IRootDesigner.SupportedTechnologies is a required override for an
        // IRootDesigner. Default is the view technology used by this designer.  
        ViewTechnology[] IRootDesigner.SupportedTechnologies 
        {
            get
            {
                return new ViewTechnology[] {ViewTechnology.Default};
            }
        }

        // RootDesignerView is a simple control that will be displayed 
        // in the designer window.
        private class RootDesignerView : Control 
        {
            private SampleRootDesigner m_designer;

            public RootDesignerView(SampleRootDesigner designer)
            {
                m_designer = designer;
                BackColor = Color.Blue;
                Font = new Font(Font.FontFamily.Name, 24.0f);
            }

            protected override void OnPaint(PaintEventArgs pe)
            {
                base.OnPaint(pe);

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

以下示例演示如何在设计器中使用“ViewTechnology> 枚举”。 此示例是为 类提供的更大示例的一 LocalizationExtenderProvider 部分。

C#

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

// This example demonstrates adding localization support to a component hierarchy from a 
// custom IRootDesigner using the LocalizationExtenderProvider class.
namespace LocalizationExtenderProviderExample
{	
    // RootViewDesignerComponent is a component associated with the SampleRootDesigner
    // IRootDesigner that provides LocalizationExtenderProvider localization support.
    // This derived class is included at the top of this example to enable 
    // easy launching of designer view without having to put the class in its own file.
    public class RootViewDesignerComponent : RootDesignedComponent
    {  
        public RootViewDesignerComponent()
        {            
        }
    }

    // The following attribute associates the RootDesignedComponent with the RootDesignedComponent component.
    [Designer(typeof(SampleRootDesigner), typeof(IRootDesigner))]
    public class RootDesignedComponent : Component
    {
        public RootDesignedComponent()
        {
        }    
    }

    // Example IRootDesigner implementation demonstrates LocalizationExtenderProvider support.
    internal class SampleRootDesigner : IRootDesigner
    {
        // RootDesignerView Control provides a full region designer view for this root designer's associated component.
        private RootDesignerView m_view;			
        // Stores reference to the LocalizationExtenderProvider this designer adds, in order to remove it on Dispose.
        private LocalizationExtenderProvider extender;        
        // Internally stores the IDesigner's component reference
        private IComponent component;                
        
        // Adds a LocalizationExtenderProvider for the component this designer is initialized to support.
        public void Initialize(System.ComponentModel.IComponent component)
        {
           this.component = component;
            
            // If no extender from this designer is active...
            if( extender == null )
            {
                // Adds a LocalizationExtenderProvider that provides localization support properties to the specified component.
                extender = new LocalizationExtenderProvider(this.component.Site, this.component);
            }
        }

        // Provides a RootDesignerView object that supports ViewTechnology.WindowsForms.
        object IRootDesigner.GetView(ViewTechnology technology) 
        {
            if (technology != ViewTechnology.WindowsForms)
            {
                throw new ArgumentException("Not a supported view technology", "technology");
            }
            if (m_view == null )
            {
                // Create the view control. In this example, a Control of type RootDesignerView is used.
                // A WindowsForms ViewTechnology view provider requires a class that inherits from Control.
                m_view = new RootDesignerView(this, this.Component);
            }
            return m_view;
        }

        // This designer supports the WindowsForms view technology.
        ViewTechnology[] IRootDesigner.SupportedTechnologies 
        {
            get
            {
                return new ViewTechnology[] {ViewTechnology.WindowsForms};
            }
        }
        
        // If a LocalizationExtenderProvider has been added, removes the extender provider.
        protected void Dispose(bool disposing)
        {            
            // If an extender has been added, remove it
            if( extender != null  )  
            {
                // Disposes of the extender provider.  The extender 
                // provider removes itself from the extender provider
                // service when it is disposed.
                extender.Dispose();
                extender = null;                
            }            
        }

        // Empty IDesigner interface property and method implementations
        public System.ComponentModel.Design.DesignerVerbCollection Verbs
        {
            get
            {
                return null;
            }
        }

        public System.ComponentModel.IComponent Component
        {
            get
            {
                return this.component;
            }
        }

        public void DoDefaultAction()
        {            
        }

        public void Dispose()
        {        
        }
        
        // RootDesignerView is a simple control that will be displayed in the designer window.
        private class RootDesignerView : Control
        {
            private SampleRootDesigner m_designer;   
            private IComponent comp;
            
            public RootDesignerView(SampleRootDesigner designer, IComponent component)
            {
                m_designer = designer;                        
                this.comp = component;      
                BackColor = Color.Blue;
                Font = new Font(FontFamily.GenericMonospace, 12);
            }

            // Displays the name of the component and the name of the assembly of the component 
            // that this root designer is providing support for.
            protected override void OnPaint(PaintEventArgs pe)
            {
                base.OnPaint(pe);

                if( m_designer != null && comp != null )
                {
                    // Draws the name of the component in large letters.
                    pe.Graphics.DrawString("Root Designer View", Font, Brushes.Yellow, 8, 4);                    
                    pe.Graphics.DrawString("Design Name  : "+comp.Site.Name, new Font("Arial", 10), Brushes.Yellow, 8, 28);                    
                    pe.Graphics.DrawString("Assembly    : "+comp.GetType().AssemblyQualifiedName, new Font("Arial", 10), Brushes.Yellow, new Rectangle(new Point(8, 44), new Size(ClientRectangle.Width-8, ClientRectangle.Height-44)));                   

                    // Uses the site of the component to acquire an ISelectionService and sets the property grid focus to the component.
                    ISelectionService selectionService = (ISelectionService)comp.Site.GetService(typeof(ISelectionService));
                    if( selectionService != null )                
                        selectionService.SetSelectedComponents( new IComponent[] { m_designer.component } );             
                }
            }
        }
    }
}

注解

视图适配器模型将替换功能并将其添加到 ViewTechnology 功能;但是，如果愿意， ViewTechnology 将保留该功能以供向后兼容性和将来使用。

ViewTechnology 定义可以指示用于控制设计器托管文档显示模式的标识符。

应仅在设计器托管环境中使用 Default 值。 在早期版本的 .NET Framework 中ViewTechnology， 枚举指定了根设计器支持的 UI 模型类型。 由于此模型不可扩展，因此应改用 视图适配器 模型。 视图适配器是一种使一种类型的对象适应另一种类型的类型。

例如，HTML 设计器可能会返回树 DemoDOM 作为其视图。 HTML 设计器返回 的 Default视图技术。 Windows 窗体宿主环境将有一个或多个可用的视图适配器类。 如果一个此类可以将 转换为DemoDOMWindows 窗体控件，则宿主应用程序可以支持这种类型的设计器。 如果没有适配器可以处理从设计器的 方法返回的 GetView 数据类型，设计器的加载将失败，并且用户将看到错误。

Visual Studio 具有一个可扩展的方案，用于提供视图适配器，因此它可以适应任何 UI 技术。 第三方技术提供商还可以提供适当的视图适配器，其对象模型可立即使用。

适用于