DesignSurface 实现设计器问题?

// 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 = "©";

            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());

        }

    }

}

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");

        }

    }

}