给datagridview添加一个数字类型列

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;

namespace winclient
{
    class numEdit:NumericUpDown,IDataGridViewEditingControl
    {
        private DataGridView grid;
        private bool valuechanged = false;
        private int rowindex;

        public void ApplyCellStyleToEditingControl(DataGridViewCellStyle dataGridViewCellStyle)
        {
            this.Font = dataGridViewCellStyle.Font;
            this.ForeColor = dataGridViewCellStyle.ForeColor;
            this.BackColor = dataGridViewCellStyle.BackColor;
        }

        public DataGridView EditingControlDataGridView
        {
            get
            {
                return grid;
            }
            set
            {
                grid = value;
            }
        }

        public object EditingControlFormattedValue
        {
            get
            {
                return this.Value;
            }
            set
            {
                if (value != null)
                    this.Value = Convert.ToDecimal(value);
            }
        }

        public int EditingControlRowIndex
        {
            get
            {
                return rowindex;
            }
            set
            {
                rowindex = value;
            }
        }

        public bool EditingControlValueChanged
        {
            get
            {
                return valuechanged;
            }
            set
            {
                valuechanged = value;
            }
        }

        public bool EditingControlWantsInputKey(Keys keyData, bool dataGridViewWantsInputKey)
        {
            switch (keyData & Keys.KeyCode)
            {
                case Keys.Left:
                case Keys.Up:
                case Keys.Down:
                case Keys.Right:
                case Keys.Home:
                case Keys.End:
                case Keys.PageDown:
                case Keys.PageUp:
                    return true;
                default:
                    return false;
            }
        }

        public Cursor EditingPanelCursor
        {
            get { return base.Cursor; }
        }

        public object GetEditingControlFormattedValue(DataGridViewDataErrorContexts context)
        {
            return EditingControlFormattedValue;
        }

        public void PrepareEditingControlForEdit(bool selectAll)
        {
            
        }

        public bool RepositionEditingControlOnValueChange
        {
            get { return false; }
        }

        protected override void OnValueChanged(EventArgs eventargs)
        {
            valuechanged = true;
            this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
            base.OnValueChanged(eventargs);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;

namespace winclient
{
    class numcell:DataGridViewTextBoxCell
    {
        private numEdit ne;
        public numcell() : base() { }
        private int pointnum;

        public int Pointnum
        {
            get { return pointnum; }
            set 
            {
                if (value < 0)
                {
                    throw new ArgumentOutOfRangeException("输入的数字必须为0以上的整数");
                }
                if (this.pointnum != value)
                {
                    pointnum = value;
                }
            }
        }

        private bool thousands=false;

        public bool Thousands
        {
            get { return thousands; }
            set { thousands = value; }
        }
        
        private decimal max=10000000;
        
        public decimal Max
        {
            get { return max; }
            set
            {
                if (value <= 0)
                {
                    throw new ArgumentOutOfRangeException("输入的数字必须为大于0的整数");
                }
                if (this.max != value)
                {
                    max = value;
                }
            }
        }

        public override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
        {
            base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);
            ne = DataGridView.EditingControl as numEdit;
            ne.Value = Convert.ToDecimal(this.Value);
            ne.DecimalPlaces = pointnum;
            if (ne != null)
            {
                ne.Size = this.Size;
                ne.DecimalPlaces = pointnum;
                ne.Maximum = max;
                ne.ThousandsSeparator = thousands;
            }
        }

        public override Type EditType
        {
            get
            {
                return typeof(numEdit);
            }
        }

        public override Type ValueType
        {
            get
            {
                Type valueType = base.ValueType;
                if (valueType != null)
                {
                    return valueType;
                }
                return ValueType;
            }
        }

        protected override object GetValue(int rowIndex)
        {
            return base.GetValue(rowIndex);
        }

        public override object DefaultNewRowValue
        {
            get
            {
                return decimal.One;
            }
        }

        public override object ParseFormattedValue(object formattedValue, DataGridViewCellStyle cellStyle, System.ComponentModel.TypeConverter formattedValueTypeConverter, System.ComponentModel.TypeConverter valueTypeConverter)
        {
            return base.ParseFormattedValue(formattedValue.ToString(), cellStyle, formattedValueTypeConverter, valueTypeConverter);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;

namespace winclient
{
    class numcolumn:DataGridViewColumn
    {
        public numcolumn() : base(new numcell()) { }

        public override DataGridViewCell CellTemplate
        {
            get
            {
                return base.CellTemplate;
            }
            set
            {
                if (value != null && !value.GetType().IsAssignableFrom(typeof(numcell)))
                    throw new InvalidCastException("列中只能使用数字单元格");
                base.CellTemplate = value;
            }
        }
    }
}