DesignSurface 实现设计器问题?

Question

用DesignSurface对象实现设计的两个问题. DesignSurface surface = new DesignSurface();
 surface.BeginLoad(typeof(System.Windows.Forms.Form));            Control view = (Control)surface.View;
            view.Dock = DockStyle.Fill;
            view.Parent = this.PelMain;
第一个是如何在宿主(view)中实现快捷菜单:如锁定、复制、删除、移到上层等。IDesignerHost idh = (IDesignerHost)surface.GetService(typeof(IDesignerHost));
IComponentChangeService icc = (IComponentChangeService)idh.GetService(typeof(IComponentChangeService));icc.ComponentRemoved += new ComponentEventHandler(icc_ComponentRemoved); 
第二个：虽然可通过这个事件知道要移除的控件，但有些控件不让移除如何做。谢谢！

Answer 1

这是个非常简单的例子，演示了用ISelectionService来获得当前组件，并用PropertyGrid来编辑该组件。
也演示了锁定、复制、删除、移到上层等简单操作，以及在锁定的状态下禁止一些操作。虽然例子本身非常简单，但设计器本身是个非常大的议题，因此代码将分两部分贴出。
有兴趣的朋友们还可以参考：Windows Forms Programming: Design-Time Architecture
using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using System.ComponentModel.Design;
using System.ComponentModel.Design.Serialization;namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        DesignSurface designSurface;
        IDesignerHost formDesignerHost;        public Form1()
        {
            InitializeComponent();
            InitializeDesignerSurface();
            InitializeListBox();            this.propertyGrid1.SelectedObject = this.formDesignerHost.RootComponent;
        }        private void InitializeDesignerSurface()
        {
            this.designSurface = new System.ComponentModel.Design.DesignSurface(typeof(Form));
            Control view =  this.designSurface.View as Control;
            this.tableLayoutPanel1.Controls.Add(view, 0, 0);
            this.tableLayoutPanel1.SetRowSpan(view, 2);
            view.Dock = DockStyle.Fill;            this.formDesignerHost = this.designSurface.GetService(typeof(IDesignerHost)) as IDesignerHost;
            this.formDesignerHost.AddService(typeof(INameCreationService), new MyNameService());
            ISelectionService selectionService = this.formDesignerHost.GetService(typeof(ISelectionService)) as ISelectionService;
            
            selectionService.SelectionChanged += delegate
            {
                System.Collections.ICollection collection = selectionService.GetSelectedComponents();
                object[] selectedObjects = new object[collection.Count];
                collection.CopyTo(selectedObjects, 0);
                this.propertyGrid1.SelectedObjects = selectedObjects;
            };
        }        private void InitializeListBox()
        {
            this.listBox1.DisplayMember = "Name";
            this.listBox1.DataSource = new Type[]
            {
                typeof(Label), typeof(Button), typeof(TextBox), typeof(RadioButton),typeof(CheckBox),
            };            this.listBox1.DoubleClick += delegate
            {
                CreateControl(this.listBox1.SelectedItem as Type);
            };
        }        private void CreateControl(Type controlType)
        {
            if (typeof(Control).IsAssignableFrom(controlType) && !typeof(Form).IsAssignableFrom(controlType))
            {
                Control control = this.formDesignerHost.CreateComponent(controlType) as Control;
                control.Text = control.Name;
                control.Location = new Point(5, System.Environment.TickCount % 200);
                (this.formDesignerHost.RootComponent as Form).Controls.Add(control);
            }
        }        private void btnLock_Click(object sender, EventArgs e)
        {
            foreach (IComponent component in this.propertyGrid1.SelectedObjects)
            {
                PropertyDescriptor lockedProperty = TypeDescriptor.GetProperties(component)["Locked"];
                if (lockedProperty != null)
                {
                    lockedProperty.SetValue(component, true);
                    this.propertyGrid1.Refresh();
                }
            }
        }        private void btnCopy_Click(object sender, EventArgs e)
        {
            Control control = this.propertyGrid1.SelectedObject as Control;
            if (control != null) CreateControl(control.GetType());
        }        private void btnDelete_Click(object sender, EventArgs e)
        {
            foreach (IComponent component in this.propertyGrid1.SelectedObjects)
            {
                if (component is Form == false && !IsLocked(component))
                {
                    this.formDesignerHost.DestroyComponent(component);
                }
            }        }        private void btnBringforward_Click(object sender, EventArgs e)
        {
            Control control = this.propertyGrid1.SelectedObject as Control;
            if (control != null && !IsLocked(control) ) control.BringToFront();
        }        private bool IsLocked(IComponent component)
        {
            PropertyDescriptor lockedProperty = TypeDescriptor.GetProperties(component)["Locked"];
            if (lockedProperty != null) return (bool)lockedProperty.GetValue(component);
            return false;
        }    }    class MyNameService : INameCreationService
    {
        static int s_i = 0;
        public string CreateName(IContainer container, Type dataType)
        {
            return dataType.Name + s_i++;
        }        public bool IsValidName(string name)
        {
            if (string.IsNullOrEmpty(name) == true) return false;
            if (char.IsDigit(name[0])) return false;
            foreach(char ch in name)
            {
                if (char.IsLetterOrDigit(ch) == false && ch != '_') return false;
            }
            return true;
        }        public void ValidateName(string name)
        {
            if (!IsValidName(name)) throw new Exception("Invalid name");
        }
    }
}

Answer 2

// Form1.Designer.cs
namespace WindowsFormsApplication1
{
    partial class Form1
    {
        private System.ComponentModel.IContainer components = null;        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }        #region Windows Form Designer generated code
        private void InitializeComponent()
        {
            this.tableLayoutPanel1 = new System.Windows.Forms.TableLayoutPanel();
            this.propertyGrid1 = new System.Windows.Forms.PropertyGrid();
            this.groupBox1 = new System.Windows.Forms.GroupBox();
            this.btnBringforward = new System.Windows.Forms.Button();
            this.btnDelete = new System.Windows.Forms.Button();
            this.btnCopy = new System.Windows.Forms.Button();
            this.btnLock = new System.Windows.Forms.Button();
            this.listBox1 = new System.Windows.Forms.ListBox();
            this.tableLayoutPanel1.SuspendLayout();
            this.groupBox1.SuspendLayout();
            this.SuspendLayout();
            // 
            // tableLayoutPanel1
            // 
            this.tableLayoutPanel1.ColumnCount = 2;
            this.tableLayoutPanel1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Percent, 100F));
            this.tableLayoutPanel1.ColumnStyles.Add(new System.Windows.Forms.ColumnStyle(System.Windows.Forms.SizeType.Absolute, 300F));
            this.tableLayoutPanel1.Controls.Add(this.propertyGrid1, 1, 0);
            this.tableLayoutPanel1.Controls.Add(this.groupBox1, 1, 1);
            this.tableLayoutPanel1.Dock = System.Windows.Forms.DockStyle.Fill;
            this.tableLayoutPanel1.RowCount = 2;
            this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 70F));
            this.tableLayoutPanel1.RowStyles.Add(new System.Windows.Forms.RowStyle(System.Windows.Forms.SizeType.Percent, 30F));
            // 
            // propertyGrid1
            // 
            this.propertyGrid1.Dock = System.Windows.Forms.DockStyle.Fill;
            // 
            // groupBox1
            // 
            this.groupBox1.Controls.Add(this.listBox1);
            this.groupBox1.Controls.Add(this.btnBringforward);
            this.groupBox1.Controls.Add(this.btnDelete);
            this.groupBox1.Controls.Add(this.btnCopy);
            this.groupBox1.Controls.Add(this.btnLock);
            this.groupBox1.Dock = System.Windows.Forms.DockStyle.Fill;
            this.groupBox1.TabStop = false;
            this.groupBox1.Text = "Double click the listbox to add control";
            // 
            // btnBringforward
            // 
            this.btnBringforward.Location = new System.Drawing.Point(6, 138);
            this.btnBringforward.Size = new System.Drawing.Size(136, 35);
            this.btnBringforward.TabIndex = 1;
            this.btnBringforward.Text = "&Bring Forward";
            this.btnBringforward.Click += new System.EventHandler(this.btnBringforward_Click);
            // 
            // btnDelete
            // 
            this.btnDelete.Location = new System.Drawing.Point(6, 100);
            this.btnDelete.Size = new System.Drawing.Size(136, 35);
            this.btnDelete.TabIndex = 2;
            this.btnDelete.Text = "&Delete";
            this.btnDelete.Click += new System.EventHandler(this.btnDelete_Click);
            // 
            // btnCopy
            // 
            this.btnCopy.Location = new System.Drawing.Point(7, 62);
            this.btnCopy.Size = new System.Drawing.Size(135, 35);
            this.btnCopy.TabIndex = 3;
            this.btnCopy.Text = "&Copy";
            this.btnCopy.Click += new System.EventHandler(this.btnCopy_Click);
            // 
            // btnLock
            // 
            this.btnLock.Location = new System.Drawing.Point(7, 21);
            this.btnLock.Size = new System.Drawing.Size(135, 35);
            this.btnLock.TabIndex = 4;
            this.btnLock.Text = "&Lock";
            this.btnLock.Click += new System.EventHandler(this.btnLock_Click);
            // 
            // listBox1
            // 
            this.listBox1.FormattingEnabled = true;
            this.listBox1.ItemHeight = 16;
            this.listBox1.Location = new System.Drawing.Point(149, 22);
            this.listBox1.Size = new System.Drawing.Size(139, 148);
            this.listBox1.TabIndex = 2;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 16F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(963, 616);
            this.Controls.Add(this.tableLayoutPanel1);
            this.Name = "Form1";
            this.Text = "Designer Host";
            this.tableLayoutPanel1.ResumeLayout(false);
            this.groupBox1.ResumeLayout(false);
            this.ResumeLayout(false);        }        #endregion        private System.Windows.Forms.TableLayoutPanel tableLayoutPanel1;
        private System.Windows.Forms.PropertyGrid propertyGrid1;
        private System.Windows.Forms.GroupBox groupBox1;
        private System.Windows.Forms.Button btnBringforward;
        private System.Windows.Forms.Button btnDelete;
        private System.Windows.Forms.Button btnCopy;
        private System.Windows.Forms.Button btnLock;
        private System.Windows.Forms.ListBox listBox1;
    }
}// Program.cs
using System;
using System.Windows.Forms;namespace WindowsFormsApplication1
{
    static class Program
    {
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}