C#在DataGridView显示一个进度条列

using System;
using System.Drawing;
using System.Windows.Forms;
using System.ComponentModel;

namespace EFwinformTools.appclass
{
    class DataGridViewProgressColumn : DataGridViewImageColumn
    {
        public DataGridViewProgressColumn()
        {
            this.CellTemplate = new DataGridViewProgressCell();
        }
    }
    class DataGridViewProgressCell : DataGridViewImageCell
    {
        static Image emptyImage;
        static DataGridViewProgressCell()
        {
            emptyImage = new Bitmap(1, 1, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
        }
        public DataGridViewProgressCell()
        {
            this.ValueType = typeof(int);
        }
        public string ShowText { get; set; } //如果要显示独立的文字而不是百分比，设置此属性。
        protected override object GetFormattedValue(object value,
                            int rowIndex, ref DataGridViewCellStyle cellStyle,
                            TypeConverter valueTypeConverter,
                            TypeConverter formattedValueTypeConverter,
                            DataGridViewDataErrorContexts context)
        {
            return emptyImage;
        }

        protected override void Paint(System.Drawing.Graphics g, System.Drawing.Rectangle clipBounds, System.Drawing.Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
        {
            string tValue = value.ToString();
            if (tValue == "") tValue = "0";

            int progressVal; 
            try { progressVal = Convert.ToInt16(tValue); }
            catch
            {
                progressVal = 0;
            }
            float percentage = ((float)progressVal / 100.0f);
            Brush backColorBrush = new SolidBrush(cellStyle.BackColor);
            Brush foreColorBrush = new SolidBrush(cellStyle.ForeColor);
            base.Paint(g, clipBounds, cellBounds,
             rowIndex, cellState, value, formattedValue, errorText,
             cellStyle, advancedBorderStyle, (paintParts & ~DataGridViewPaintParts.ContentForeground));
            
            string DrawStringStr = progressVal.ToString() + "%";
            if (ShowText != "")
            {
                DrawStringStr = ShowText;
            }
            if (percentage > 0.0)
            {
                g.FillRectangle(new SolidBrush(Color.FromArgb(163, 189, 242)), cellBounds.X + 2, cellBounds.Y + 2, Convert.ToInt32((percentage * cellBounds.Width - 4)), cellBounds.Height - 4);
                g.DrawString(DrawStringStr, cellStyle.Font, foreColorBrush, cellBounds.X + 30, cellBounds.Y + 5);
            }
            else
            {
                if (this.DataGridView.CurrentRow.Index == rowIndex)
                    g.DrawString(DrawStringStr, cellStyle.Font, new SolidBrush(cellStyle.SelectionForeColor), cellBounds.X + 30, cellBounds.Y + 5);
                else
                    g.DrawString(DrawStringStr, cellStyle.Font, foreColorBrush, cellBounds.X + 30, cellBounds.Y + 5);
            }
        }
    }
}

ShowText属性，是为了把显示文字可以独立设置。默认是显示百分比。

使用时，直接绑定含有百分比的整型数字即可，绑定时无法独立设置显示的值，下面的方法是独立设置值时的方法

DataGridViewProgressCell ProgressCell= new DataGridViewProgressCell();

                    string fValue = PatentList.Rows[i]["Correlation"].ToString();
                    if (fValue == "") fValue = "0";
                    try
                    {
                        ProgressCell.Value = Convert.ToInt16(fValue) * 10;
                        ProgressCell.ShowText = fValue.ToString();
                    }
                    catch
                    {
                        ProgressCell.Value = 0;
                        ProgressCell.ShowText = "";
                    }
                   // PatentRow.Cells[3] = ProgressCell; //指定单元格为上面定义的ProgressCell

值变化重绘时：

foreach (DataGridViewRow SelectDr in dataGridView2.SelectedRows)
            {
                SelectDr.Cells["Progress"].Value = value;
                ((DataGridViewProgressCell)SelectDr.Cells[3]).ShowText = value.ToString();
            }

上图：