C＃中datagridview使用技巧系列谈（－）让输入焦点从左到右收藏

 问题的提出

      经常使用的datagridview控件，当你利用它来输入数据时，如果你按下Enter 时，系统默认的是将输入焦点移动至当前列的下一行，但按中国人日常的习惯，我们希望它从左到右进行输入，怎么办呢？

  这里我们就要修改系统的两个默认键盘时间，以实现我们自如的控制datagridview埪件对回车Press事件的处理方式，具体怎么操作呢？

   新建一用户控件－该用户埪件继承于datagridview，在该埪件的代码中重写ProcessDialogKey， ProcessDataGridViewKey两个事件，让将该用户控件添加到你的项目中就可以应用了。

 

Code
  1  public partial class MyDataGridView : DataGridView
  2     {
  3         private string _startEditColumnName = "";
  4         /// <summary>
  5         /// 开始编辑列的名称
  6         /// </summary>
  7         public string StartEditColumnName
  8         {
  9             get { return _startEditColumnName; }
 10             set { _startEditColumnName = value; }
 11         }
 12         private LJFWCommon.ConstEnum.OperateStateEnum _operateState = LJFWCommon.ConstEnum.OperateStateEnum.New;
 13         /// <summary>
 14         /// 操作状态
 15         /// </summary>
 16         public LJFWCommon.ConstEnum.OperateStateEnum OperateState
 17         {
 18             get { return _operateState; }
 19             set { _operateState = value; }
 20         }
 21 
 22         public MyDataGridView()
 23         {
 24             InitializeComponent();
 25         }
 26 
 27         public MyDataGridView(IContainer container)
 28         {
 29             container.Add(this);
 30 
 31             InitializeComponent();
 32         }
 33 
 34         protected override void OnScroll(ScrollEventArgs e)
 35         {
 36             //this.Invalidate();
 37             base.OnScroll(e);
 38         }
 39 
 40         protected override void OnRowEnter(DataGridViewCellEventArgs e)
 41         {
 42             //this.Invalidate();
 43 
 44             base.OnRowEnter(e);
 45         }
 46 
 47         protected override void OnPaint(PaintEventArgs e)
 48         {
 49             base.OnPaint(e);
 50         }
 51 
 52         protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
 53         {
 54             //if (keyData == Keys.Enter)
 55             //{
 56             //    SendKeys.Send("{tab}");
 57             //    return true;
 58             //}
 59 
 60             return base.ProcessCmdKey(ref msg, keyData);
 61         }
 62 
 63         protected override bool ProcessDialogKey(Keys keyData)
 64         {
 65             Keys k = keyData & Keys.KeyCode;
 66             if (k == Keys.Enter)
 67             {
 68                 return this.ProcessRightKey(keyData );
 69             }
 70 
 71             return base.ProcessDialogKey(keyData);
 72         }
 73 
 74         protected override bool ProcessDataGridViewKey(KeyEventArgs e)
 75         {
 76             if (e.KeyCode == Keys.Enter)
 77             {
 78                 return this.ProcessRightKey(e.KeyCode);
 79             }
 80 
 81             return base.ProcessDataGridViewKey(e);
 82         }
 83 
 84         protected new bool ProcessRightKey(Keys keyData)
 85         {
 86             Keys k = Keys.KeyCode & keyData;
 87             if (k == Keys.Enter)
 88             {
 89                 //如果dgv中输入焦点在最后一行最后一列则新增行，并将输入交代那移到新增行，首列
 90                 if ((base.CurrentCell.ColumnIndex == (base.ColumnCount - 1)) && (base.CurrentCell.RowIndex == (base.RowCount - 1)))
 91                 {
 92                     if (_operateState == LJFWCommon.ConstEnum.OperateStateEnum.New)
 93                     {
 94                         base.Rows.Add(1);
 95                     }
 96                     base.CurrentCell = base.Rows[base.RowCount - 1].Cells[""+ _startEditColumnName +""];
 97 
 98                     return true;
 99                 }
100                 if ((base.CurrentCell.ColumnIndex == (base.ColumnCount - 1)) && (base.CurrentCell.RowIndex + 1 != base.NewRowIndex))
101                 {
102                     base.CurrentCell = base.Rows[base.CurrentCell.RowIndex + 1].Cells[""+ _startEditColumnName +""];
103                     return true;
104                 }
105                 return base.ProcessRightKey(keyData);
106             }
107 
108             return base.ProcessRightKey(keyData);
109         }
110     }

 

（二）DataGridView上移下移当前行

public DataGridView _Dgv = null;
        /// <summary>
        /// 设置上移下移操作的数据源控件
        /// </summary>
        public DataGridView Dgv
        {
            get { return _Dgv; }
            set { _Dgv = value; }
        }

 protected virtual void First()
        {
            if (_Dgv == null) return;
            CurrencyManager cm = this.BindingContext[_Dgv.DataSource] as CurrencyManager;
            if (cm != null)
            {
                cm.Position = 0;
            }
        }

        public virtual void Previous()
        {
            if (_Dgv == null) return;

            CurrencyManager cm = this.BindingContext[_Dgv.DataSource] as CurrencyManager;
            if (cm != null)
            {
                cm.Position--;
            }
        }

        protected virtual void Next()
        {
            if (_Dgv == null) return;

            CurrencyManager cm = this.BindingContext[_Dgv.DataSource] as CurrencyManager;
            if (cm != null)
            {
                cm.Position++;
            }
        }

        protected virtual void Last()
        {
            if (_Dgv == null) return;

            CurrencyManager cm = this.BindingContext[_Dgv.DataSource] as CurrencyManager;
            if (cm != null)
            {
                cm.Position = cm.Count;
            }
        }