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C#重写DataGridView

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using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Windows.Forms;
using System.Drawing.Drawing2D;
namespace CRD.WinUI.Editors
{
  public class DataGridView : System.Windows.Forms.DataGridView
  {
    private bool _CellColorOnchange=false;
    private Color cell_color = Color.Yellow;
    private bool shifouhuasanjiao = true;
    private Color color_grid = Color.FromArgb(236, 233, 216);
    bool click = false;
    public DataGridView()
    {
      this.SetStyle(ControlStyles.DoubleBuffer | ControlStyles.AllPaintingInWmPaint, true);
    }
    protected override void OnCreateControl()
    {
      this.EnableHeadersVisualStyles = false;
      this.ColumnHeadersDefaultCellStyle.BackColor = Color.FromArgb(236, 233, 216);
      this.ColumnHeadersBorderStyle = DataGridViewHeaderBorderStyle.Raised;
      //this.ColumnHeadersHeight = 20;
      this.ColumnHeadersHeightSizeMode = DataGridViewColumnHeadersHeightSizeMode.DisableResizing;
      this.ColumnHeadersDefaultCellStyle.Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleCenter;
      this.ColumnHeadersDefaultCellStyle.ForeColor = System.Drawing.SystemColors.WindowText;
      this.ColumnHeadersDefaultCellStyle.SelectionBackColor = System.Drawing.SystemColors.Highlight;
      this.ColumnHeadersDefaultCellStyle.SelectionForeColor = System.Drawing.SystemColors.HighlightText;
      this.RowHeadersDefaultCellStyle.Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleLeft;
      this.RowHeadersDefaultCellStyle.BackColor = Color.FromArgb(236, 233, 216);
      this.RowHeadersDefaultCellStyle.ForeColor = System.Drawing.SystemColors.WindowText;
      this.RowHeadersBorderStyle = System.Windows.Forms.DataGridViewHeaderBorderStyle.Raised;
      this.DefaultCellStyle.SelectionBackColor = Color.DarkBlue;
      this.DefaultCellStyle.SelectionForeColor = Color.DarkSlateBlue;
      this.RowHeadersWidthSizeMode = DataGridViewRowHeadersWidthSizeMode.DisableResizing;
      //this.GridColor = Color.Silver;//表格点击后颜色 表格线颜色
      this.BackgroundColor = System.Drawing.SystemColors.Window;
      this.BorderStyle = System.Windows.Forms.BorderStyle.Fixed3D;
      this.AllowUserToOrderColumns = true;
      this.AutoGenerateColumns = true;
      base.OnCreateControl();
    }
    Color defaultcolor;
    //移到单元格时的颜色
    protected override void OnCellMouseMove(DataGridViewCellMouseEventArgs e)
    {
      base.OnCellMouseMove(e);
      try
      {
        if (_CellColorOnchange)
          Rows[e.RowIndex].DefaultCellStyle.BackColor = cell_color;
      }
      catch (Exception)
      {
      }
    }
    //进入单元格时保存当前的颜色
    protected override void OnCellMouseEnter(DataGridViewCellEventArgs e)
    {
      base.OnCellMouseEnter(e);
      try
      {
        if (_CellColorOnchange)
          defaultcolor = Rows[e.RowIndex].DefaultCellStyle.BackColor;
      }
      catch (Exception)
      {
      }
    }
    //离开时还原颜色
    protected override void OnCellMouseLeave(DataGridViewCellEventArgs e)
    {
      base.OnCellMouseLeave(e);
      try
      {
        if (_CellColorOnchange)
          Rows[e.RowIndex].DefaultCellStyle.BackColor = defaultcolor;
      }
      catch (Exception)
      {
      }
    }
    public bool CellColorOnchange
    {
      get
      {
        return _CellColorOnchange;
      }
      set
      {
        _CellColorOnchange = value;
      }
    }
    public Color DefaultcolorSet
    {
      get
      {
        return cell_color;
      }
      set
      {
        cell_color = value;
      }
    }
    public bool Shifouhua_Sanjiao
    {
      get
      {
        return shifouhuasanjiao;
      }
      set
      {
        shifouhuasanjiao = value;
      }
    }
    public Color Content_Grid_color
    {
      get
      {
        return color_grid;
      }
      set
      {
        color_grid = value;
      }
    }
    private void InitializeComponent()
    {
      ((System.ComponentModel.ISupportInitialize)(this)).BeginInit();
      this.SuspendLayout();
      //
      // DataGridView
      //
      //this.RowTemplate.Height = 17;
        
      ((System.ComponentModel.ISupportInitialize)(this)).EndInit();
      this.ResumeLayout(false);
    }
    //RowPostPaint
    protected override void OnRowPostPaint(DataGridViewRowPostPaintEventArgs e)
    {
       
      if (shifouhuasanjiao)
      {
        using (SolidBrush b = new SolidBrush(Color.Black))
        {
          Image image = global::CRD.WinUI.Properties.Resources.未标题_1;
          //e.Graphics.DrawString("►", e.InheritedRowStyle.Font, b, e.RowBounds.Location.X + 5, e.RowBounds.Location.Y + 4);
          //e.Graphics.DrawImageUnscaled(image, e.RowBounds.Location.X + 1, e.RowBounds.Location.Y + 2, 8, 13);
          if (click)
          if (e.RowIndex == this.CurrentRow.Index) {
            e.Graphics.DrawImageUnscaled(image, e.RowBounds.Location.X + 1, e.RowBounds.Location.Y + 2, 8, 13);
          }
            
        }
      }
        
        
      base.OnRowPostPaint(e);
    }
     
     
    protected override void OnRowPrePaint(DataGridViewRowPrePaintEventArgs e)
    {
      if (shifouhuasanjiao)
      {
        using (SolidBrush b = new SolidBrush(Color.Black))
        {
          Image image = global::CRD.WinUI.Properties.Resources.未标题_1;
          //e.Graphics.DrawString("►", e.InheritedRowStyle.Font, b, e.RowBounds.Location.X + 5, e.RowBounds.Location.Y + 4);
           //e.Graphics.DrawImageUnscaled(image, e.RowBounds.Location.X + 1, e.RowBounds.Location.Y + 2, 8, 13);
        }
      }
      base.OnRowPrePaint(e);
    }
    protected override void OnCellClick(DataGridViewCellEventArgs e)
    {
      if (e.RowIndex > -1&&this.CurrentRow.Index == e.RowIndex )
      {
        click = true;
      }
      base.OnCellClick(e);
    }
    protected override void OnCellPainting(DataGridViewCellPaintingEventArgs e)
    {
      base.OnCellPainting(e);
        
      SolidBrush b = new SolidBrush(Color.FromArgb(236, 233, 216));
      Pen whitePen = new Pen(color_grid, 1);
      if (e.ColumnIndex == -1 && e.RowIndex == -1)
      {
        using (LinearGradientBrush brush = new LinearGradientBrush(e.CellBounds, Color.Gray,
          Color.Gray, LinearGradientMode.ForwardDiagonal))
        {
          e.Graphics.FillRectangle(b, e.CellBounds);
          Rectangle border = e.CellBounds;
          border.Offset(new Point(-1, -1));
          e.Graphics.DrawRectangle(Pens.Gray, border);
        }
        e.PaintContent(e.CellBounds);
        e.Handled = true;
      }
      else if (e.RowIndex == -1)
      {
        //标题行
        using (LinearGradientBrush brush = new LinearGradientBrush(e.CellBounds, Color.Silver,
          Color.Silver, LinearGradientMode.Vertical))
        {
          e.Graphics.FillRectangle(b, e.CellBounds);
          Rectangle border = e.CellBounds;
          border.Offset(new Point(-1, -1));
          e.Graphics.DrawRectangle(Pens.Silver, border);
          //e.Graphics.DrawRectangle(Pens.Black, border.X + 1, border.Y + 1, border.Width - 1, border.Height - 1);
        }
        e.PaintContent(e.CellBounds);
        e.Handled = true;
      }
      else if (e.ColumnIndex == -1)
      {
        //标题列
        using (LinearGradientBrush brush = new LinearGradientBrush(e.CellBounds, Color.Silver,
          Color.Silver, LinearGradientMode.Horizontal))
        {
            
          e.Graphics.FillRectangle(b, e.CellBounds);
          Rectangle border = e.CellBounds;
          border.Offset(new Point(-1, -1));
          e.Graphics.DrawRectangle(Pens.Silver, border);
          //e.Graphics.DrawRectangle(Pens.Black, border.X+1,border.Y+1,border.Width-1,border.Height-1);
          e.Graphics.DrawString("△", Font,b,e.CellBounds.X,e.CellBounds.Y);
        }
        e.PaintContent(e.CellBounds);
        e.Handled = true;
      }
      else
      {
        //Color.FromArgb(193, 193, 193)
        Rectangle border = e.CellBounds;
        border.Offset(new Point(-1, -1));
  
        e.Graphics.DrawRectangle(whitePen, border);
      }
    }
  }
}

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