继承DataGridView

 public partial class DataGridViewEx : DataGridView
    {
        public delegate void ProcessEnterDeletegate();
        private event ProcessEnterDeletegate ProcessEnterDeletegateHandler;

        public DataGridViewEx()
        {
            InitializeComponent();
        }
        //public DataGridViewEx(ProcessEnterDeletegate del)
        //{
        //    InitializeComponent();
        //    ProcessEnterDeletegateHandler = del;
        //}

        public void SetHandler(ProcessEnterDeletegate del)
        {
            ProcessEnterDeletegateHandler = del;
        }

        protected override bool ProcessDialogKey(Keys keyData)
        {
            //是回车键
            if (keyData == (System.Windows.Forms.Keys.LButton | System.Windows.Forms.Keys.MButton | System.Windows.Forms.Keys.Back))
            {
                if (ProcessEnterDeletegateHandler != null) {                    
                    ProcessEnterDeletegateHandler();
                }
                return true;
            }
            return base.ProcessDialogKey(keyData);
        }

    }



/////////////// 调用页面///////////////////////

 public void SendKey()
        {
            SendKeys.Send("{TAB}");
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.dataGridViewEx1.SetHandler(SendKey);   //绑定处理程序
            this.dataGridViewEx1.Focus();
            this.f_sjzdTableAdapter.Fill(this.fSZJCM0420DataSet.F_sjzd);
        }

//msdn的例子

public class CustomDataGridView : DataGridView
{
    [System.Security.Permissions.UIPermission(
        System.Security.Permissions.SecurityAction.LinkDemand,
        Window = System.Security.Permissions.UIPermissionWindow.AllWindows)]
    protected override bool ProcessDialogKey(Keys keyData)
    {
        // Extract the key code from the key value. 
        Keys key = (keyData & Keys.KeyCode);

        // Handle the ENTER key as if it were a RIGHT ARROW key. 
        if (key == Keys.Enter)
        {
            return this.ProcessRightKey(keyData);
        }
        return base.ProcessDialogKey(keyData);
    }

    [System.Security.Permissions.SecurityPermission(
        System.Security.Permissions.SecurityAction.LinkDemand, Flags = 
        System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode)]
    protected override bool ProcessDataGridViewKey(KeyEventArgs e)
    {
        // Handle the ENTER key as if it were a RIGHT ARROW key. 
        if (e.KeyCode == Keys.Enter)
        {
            return this.ProcessRightKey(e.KeyData);
        }
        return base.ProcessDataGridViewKey(e);
    }