winform datagridview 刷新数据不需要重新绑定

winform datagridview 刷新数据不需要重新绑定以及添加COMBOX方法

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DatagridviewTest
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.dataGridView1.SelectionMode = System.Windows.Forms.DataGridViewSelectionMode.CellSelect;
            BindCombox();
            BindDatasources();
        }

        int vscroll = 0, hscroll = 0;

        #region datagridview 绑定数据自动刷新、添加、删除等

        /// <summary>
        /// datagridview 数据源
        /// 必须使用BindingList， 如果使用LIST，无法实现更改，添加、删除数据源自动更新datagridview
        /// </summary>
        BindingList<Studect> studentLst = new BindingList<Studect>();

        void BindDatasources()
        {
            studentLst.Add(new Studect() { Name = "A", Age = 10, UpdateTime = DateTime.Now.ToString(), Sex = 1 });
            studentLst.Add(new Studect() { Name = "B", Age = 10, UpdateTime = DateTime.Now.ToString(), Sex = 1 });
            studentLst.Add(new Studect() { Name = "C", Age = 10, UpdateTime = DateTime.Now.ToString(), Sex = 1 });
            studentLst.Add(new Studect() { Name = "D", Age = 10, UpdateTime = DateTime.Now.ToString(), Sex = 1 });
            studentLst.Add(new Studect() { Name = "E", Age = 10, UpdateTime = DateTime.Now.ToString(), Sex = 0 });

            this.dataGridView1.DataSource = studentLst;
            dataGridView1.FirstDisplayedScrollingRowIndex = vscroll;
            dataGridView1.HorizontalScrollingOffset = hscroll;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            studentLst.Add(new Studect() { Name = DateTime.Now.ToString(), Age = 10, UpdateTime = DateTime.Now.ToString() });
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (dataGridView1.SelectedRows != null)
            {
                Studect s = dataGridView1.CurrentRow.DataBoundItem as Studect;
                if (s != null)
                    studentLst.Remove(s);

            }
        }


        #endregion


        #region datagridview 添加combox下拉框

        ComboBox sexCmb = new ComboBox();
        private void BindCombox()
        {
            List<ContainerType<int>> SexLst = new List<ContainerType<int>>()
            {
                new ContainerType<int>(){ Value = 0,Describle="男"},
                new ContainerType<int>(){ Value = 1,Describle="女"},
            };


            #region 方法一

            //sexCmb.DisplayMember = "Describle";
            //sexCmb.ValueMember = "Value";
            //sexCmb.DataSource = SexLst;
            //sexCmb.DropDownStyle = ComboBoxStyle.DropDownList;
            //sexCmb.DrawMode = DrawMode.OwnerDrawFixed;
            //sexCmb.DrawItem += SexCmb_DrawItem;

            //// 设置下拉列表框不可见
            //sexCmb.Visible = false;

            //// 添加下拉列表框事件
            //sexCmb.SelectedIndexChanged += new EventHandler(cmb_Temp_SelectedIndexChanged);


            //dataGridView1.Scroll += dataGridView1_Scroll;
            //dataGridView1.ColumnWidthChanged += dataGridView1_ColumnWidthChanged;
            //dataGridView1.CurrentCellChanged += dataGridView1_CurrentCellChanged;
            ////dataGridView1.DataBindingComplete += DataGridView1_DataBindingComplete;

            //// 将下拉列表框加入到DataGridView控件中
            //this.dataGridView1.Controls.Add(sexCmb);

            #endregion


            #region 方法二


            DataGridViewTextBoxColumn c1 = new DataGridViewTextBoxColumn();
            c1.DataPropertyName = "Name";
            c1.HeaderText = "名字";
            dataGridView1.Columns.Add(c1);

            DataGridViewComboBoxColumn dgvCmb = new DataGridViewComboBoxColumn();
            dgvCmb.DisplayMember = "Describle";
            dgvCmb.ValueMember = "Value";
            dgvCmb.DataSource = SexLst;
            dgvCmb.DataPropertyName = "Sex";
            dgvCmb.HeaderText = "性别";
            //dgvCmb.FlatStyle = FlatStyle.Flat;
            dgvCmb.DisplayStyle = DataGridViewComboBoxDisplayStyle.Nothing;
            //dgvCmb.

            dataGridView1.Columns.Add(dgvCmb);
            //dataGridView1.CellEnter += DataGridView1_CellEnter;
            dataGridView1.EditingControlShowing += DataGridView1_EditingControlShowing;
            dataGridView1.CellEndEdit += DataGridView1_CellEndEdit;
            //dataGridView1.e
            #endregion






        }

        private void DataGridView1_CellEnter(object sender, DataGridViewCellEventArgs e)
        {
            //实现单击一次显示下拉列表框
            if (dataGridView1.Columns[e.ColumnIndex] is DataGridViewComboBoxColumn && e.RowIndex != -1)
            {
                SendKeys.SendWait("{F4}");
            }
        }

        private void DataGridView1_CellEndEdit(object sender, DataGridViewCellEventArgs e)
        {
            if (sexCmb != null)
            {
                sexCmb.DrawItem -= Cmb_DrawItem;
                //sexCmb.Dispose();
                sexCmb = null;
            }
        }

        private void DataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
        {
            if (e.Control.GetType() == typeof(DataGridViewComboBoxEditingControl))
            {
                sexCmb = e.Control as ComboBox;
                sexCmb.DrawMode = DrawMode.OwnerDrawFixed;

                sexCmb.DrawItem += Cmb_DrawItem;
            }
        }

        private void Cmb_DrawItem(object sender, DrawItemEventArgs e)
        {
            ComboBox combox = sender as ComboBox;
            Pen fColor = new Pen(Color.Black);
            Pen bColor = new Pen(Color.White);
            var a = combox.Items[e.Index] as ContainerType<int>;

            if (a.Value == 0)
            {
                fColor = new Pen(Color.Green);
            }
            else
            {
                fColor = new Pen(Color.Red);
            }
            if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
            {
                bColor = new Pen(Color.Blue);
                fColor = new Pen(Color.White);
            }

            e.Graphics.FillRectangle(bColor.Brush, e.Bounds);

            e.Graphics.DrawString(a.Describle, this.Font, fColor.Brush, e.Bounds);

            //combox.DrawItem -= Cmb_DrawItem;

        }

        private void Combox_SelectedIndexChanged(object sender, EventArgs e)
        {
            ComboBox combox = sender as ComboBox;
            


            combox.SelectedIndexChanged -= Combox_SelectedIndexChanged;
        }

        private void SexCmb_DrawItem(object sender, DrawItemEventArgs e)
        {
            //初始化字体和背景色
            Pen fColor = new Pen(Color.Black);
            Pen bColor = new Pen(Color.White);
            //if (e.Index < 0) return;
            var a = sexCmb.Items[e.Index] as ContainerType<int>;
            
            if (a.Value == 0)
            {
                fColor = new Pen(Color.Green);
            }
            else
            {
                fColor = new Pen(Color.Red);
            }
            e.Graphics.FillRectangle(bColor.Brush, e.Bounds);
            
            e.Graphics.DrawString(a.Describle, this.Font, fColor.Brush, e.Bounds);
        }

        private void DataGridView1_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
        {
            for (int i = 0; i < this.dataGridView1.Rows.Count; i++)
            {
                //for (int c = 0; c < dataGridView1.Columns.Count; c++)
                //{

                //}
                if (dataGridView1.Rows[i].Cells[2].Value != null)
                {
                    if (dataGridView1.Rows[i].Cells[2].Value.ToString().Trim() == "1")
                    {
                        dataGridView1.Rows[i].Cells[2].Value = "女";
                    }
                    else if(dataGridView1.Rows[i].Cells[2].Value.ToString().Trim() == "0")
                    {
                        dataGridView1.Rows[i].Cells[2].Value = "男";
                    }
                }
            }
        }


        // 当用户移动到性别这一列时单元格显示下拉列表框
        private void dataGridView1_CurrentCellChanged(object sender, EventArgs e)
        {
            DataGridViewCell CurrnetCell = dataGridView1.CurrentCell;
            if (CurrnetCell != null && CurrnetCell.OwningColumn.HeaderText == "性别")
            {
                Rectangle TmpRect = dataGridView1.GetCellDisplayRectangle(CurrnetCell.ColumnIndex, CurrnetCell.RowIndex, false);
                sexCmb.SelectedValue = CurrnetCell.Value;
                //sexCmb.Text = CurrnetCell.Value.ToString();
                sexCmb.Size = TmpRect.Size;
                sexCmb.Top = TmpRect.Top;
                sexCmb.Left = TmpRect.Left;
                sexCmb.Visible = true;
            }
            else
            {
                sexCmb.Visible = false;
            }
        }

     

        // 滚动DataGridView时将下拉列表框设为不可见
        private void dataGridView1_Scroll(object sender, ScrollEventArgs e)
        {
            if (e.ScrollOrientation == ScrollOrientation.HorizontalScroll)
            {
                hscroll = e.NewValue;
            }
            else if (e.ScrollOrientation == ScrollOrientation.VerticalScroll)
            {
                vscroll = e.NewValue;
            }
            this.sexCmb.Visible = false;
        }


        // 改变DataGridView列宽时将下拉列表框设为不可见
        private void dataGridView1_ColumnWidthChanged(object sender, DataGridViewColumnEventArgs e)
        {
            this.sexCmb.Visible = false;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (dataGridView1.SelectedRows != null)
            {
                Studect s = dataGridView1.CurrentRow.DataBoundItem as Studect;
                if (s != null)
                {
                    s.Name = DateTime.Now.ToString();//修改名称，界面自动更新
                }

            }
        }

        // 当用户选择下拉列表框时改变DataGridView单元格的内容
        private void cmb_Temp_SelectedIndexChanged(object sender, EventArgs e)
        {
            dataGridView1.CurrentCell.Value = ((ComboBox)sender).SelectedValue;
        }
        
        //sexComb

        #endregion

    }


    /// <summary>
    /// 
    /// </summary>
    public class Studect : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        private void NotifyPropertyChanged(String info)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(info));
        }

        string _name;
        [DisplayName("你的名字")]  // 这是显示的列名称哦
        public string Name
        {
            get { return _name; }
            set
            {
                if (_name != value)
                {
                    _name = value;
                    NotifyPropertyChanged("Name");
                }
            }
        }

        // 2) 在属性改变时引发事件
        int _age;
        [DisplayName("他的年纪")]
        public int Age
        {
            get { return _age; }
            set
            {
                if (_age != value)
                {
                    _age = value;
                }
            }
        }

        int _sex;
        [DisplayName("性别")]
        public int Sex
        {
            get { return _sex; }
            set { _sex = value; }
        }

        //List<ContainerType<int>> _sexlst;
        //[DisplayName("性别")]
        //public List<ContainerType<int>> SexLst
        //{
        //    get { return _sexlst; }
        //    set { _sexlst = value; }
        //}


        string _updateTime;
        [DisplayName("更新时间")]
        public string UpdateTime
        {
            get { return _updateTime; }
            set
            {
                if (_updateTime != value)
                {
                    _updateTime = value;
                }
            }
        }



    }


    public class ContainerType<T>
    {
        public T Value { get; set; }

        public string Describle { get; set; }


    }
}