编辑：版本：4.0.30319.42000
我在想最简单的办法。
我有一个表单与多种控件类型。在窗体加载之前，我有一个例程从设置文件加载窗体控件的值。然后我使用Application调用窗体打开。
我有一个on_change例程，它知道任何表单控件的值何时更改，并显示一个CANCEL按钮。
我希望能够让用户按下这个取消按钮，并恢复到每个控件的原始值（在下面的代码示例中，我的盒子）。而不关闭表单（并失去其可见性）。
我不想再重新加载表格。我希望我能用FormState做些什么，但我不确定这将如何工作。
下面是一些示例代码：

public class Settings
{
     public static string MYPathFile_M = "";
}

public class MYClass
{
     [STAThread]
     public void main()
     {
          if(!fileExists())  //  Verifies setting file exists and reads in to variables
          {
               Application.EnableVisualStyles();
               Application.Run(new MYFORM_FORM());
          }
     }

     public bool fileExists()  // SIMPLIFIED FOR SPACE...
     {
          // if(!File.Exists ....
          // Open and read settings file
          // Load settings from file into public class Settings variables
          return true;
     }
}

public class MYFORM_FORM : Form
{
     public string result = null;

     public MYFORM_FORM()
     {
          // MY FORM SETTINGS
          this.ClientSize = new Size(1452, 577);
          this.Font = new Font("Arial", 12F, FontStyle.Regular, GraphicsUnit.Point, ((byte)(0)));
          this.Margin = new Padding(2, 4, 2, 4);
          this.FormBorderStyle = FormBorderStyle.FixedDialog;
          this.MaximizeBox = false;
          this.MinimizeBox = false;
          this.ControlBox = false;
          this.StartPosition = FormStartPosition.CenterScreen;
          this.MinimumSize = new Size(this.Width, this.Height);
          this.MaximumSize = new Size(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
          int FontSize = 12;
          int ControlSpacing = 15;
          this.FormClosing += new FormClosingEventHandler((sender, e) => MYFORM_FORM_FormClosing(sender, e));
          this.Load += new System.EventHandler((sender, e) => MYFORM_FORM_Load(sender, e));
          this.Name = "MYFORM_FORM";
          this.Text = "My Form Settings"; 

          // MY BOX SETTINGS
          RichTextBox MYBox = new RichTextBox();
          MYBox.Location = new Point(12, 313);
          MYBox.Name = "MYBox";
          MYBox.ReadOnly = false;
          MYBox.ScrollBars = RichTextBoxScrollBars.Vertical;
          MYBox.ShortcutsEnabled = false;
          MYBox.Size = new System.Drawing.Size(938, 56);
          MYBox.TabIndex = 10;
          MYBox.Text = Settings.MYPathFile_M;  // Is a file path variable from public class Settings
          this.Controls.Add(MYBox);
          MYBox.BringToFront();

          // MY CANCEL BUTTON SETTINGS
          Button Cancel_Button = new Button();
          Cancel_Button.AutoEllipsis = true;
          Cancel_Button.BackgroundImageLayout = System.Windows.Forms.ImageLayout.Stretch;
          Cancel_Button.FlatAppearance.MouseOverBackColor = System.Drawing.Color.Gray;
          Cancel_Button.ForeColor = System.Drawing.SystemColors.ActiveCaptionText;
          Cancel_Button.Location = new Point(1035, 517);
          Cancel_Button.Name = "Cancel_Button";
          Cancel_Button.Text = "CANCEL";
          Cancel_Button.Size = new Size(200, 48);
          Cancel_Button.Visible = false;  // Will be made true when there's a change on the form
          Cancel_Button.TabIndex = 20;
          Cancel_Button.UseVisualStyleBackColor = true;
          Cancel_Button.Click += new EventHandler((sender, e) => Cancel_Button_Clicked(sender, e));
          this.Controls.Add(Cancel_Button);

          Functions.ShowForm(this);
     }
     
     private void Cancel_Button_Clicked(object sender, EventArgs e)
     {
          if(Global.SaveChanges)  // Returns TRUE if there were changes on the form
          {
               DialogResult dr = MessageBox.Show("Are you sure you wish to cancel changes?","", MessageBoxButtons.YesNo);
               switch(dr)
               {
                    case DialogResult.Yes:
                    this.Controls["Cancel_Button"].Visible = false;
                    //  WHAT CODE COULD BE PLACED HERE TO ACCOMPLISH WHAT I'M TRYING TO DO??  //
                    //  FORM ORIGINAL VALUES SHOULD BE REINSTATED AND CANCEL BUTTON DISAPPEARS //
                    break;
                    case DialogResult.No:
                    break;
               }
     }
     else { this.Close(); }
     }
}

public class Functions
{
     public static void ShowForm(Form f)
     {
          IntPtr myHandle = f.Handle;
          SetForegroundWindow(myHandle.ToInt32());
     }

     [DllImport("User32.dll")]
     public static extern Int32 SetForegroundWindow(int hWnd);
}

希望可以在Cancel Button例程中放置一些相对简单的东西，以便能够将窗体的控件恢复为开始时加载的初始值。
我不确定最好的方法。