DataGridView功能扩展

• 添加了ProgressBar列功能
• Row标题添加DataGridView行序号
• 奇偶行间变
• 控件编辑状态下立即提交
• 选中行变色功能

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

namespace TestDataGridView
{
    class MyDataGridView:System.Windows.Forms.DataGridView
    {
        SolidBrush solidBrush;
        //Button saveButton;
        //Button openButton;

        public MyDataGridView()
        {
            solidBrush = new SolidBrush(this.RowHeadersDefaultCellStyle.ForeColor);

            this.ColumnHeadersVisible = true;
            //saveButton = new Button();
            //saveButton.Size = new Size(this.ColumnHeadersHeight - 2, 18);
            //saveButton.Location = new Point(0, 1);
            //this.Controls.Add(saveButton);

            //openButton = new Button();
            //openButton.Size = new Size(this.ColumnHeadersHeight - 2, 18);
            //openButton.Location = new Point(20, 1);
            //this.Controls.Add(openButton);

        }
        protected override void OnCellClick(DataGridViewCellEventArgs e)
        {
            base.OnCellClick(e);
            for (int i = 0; i < this.Rows.Count; )
            {
                if (i == e.RowIndex)
                {
                    this.Rows[e.RowIndex].DefaultCellStyle.BackColor = System.Drawing.Color.LightGreen;
                }
                else
                {
                    if (i % 2 == 0)
                        this.Rows[i].DefaultCellStyle.BackColor = System.Drawing.Color.FromArgb(234, 254, 255);
                    else
                        this.Rows[i].DefaultCellStyle.BackColor = System.Drawing.Color.White;
                }
                i += 1;

            }

        }
        protected override void OnRowsAdded(DataGridViewRowsAddedEventArgs e)
        {
            base.OnRowsAdded(e);
            //颜色渐变
            for (int i = 0; i < this.Rows.Count; )
            {
                if (i % 2 == 0)
                    this.Rows[i].DefaultCellStyle.BackColor = System.Drawing.Color.FromArgb(234, 254, 255);
                else
                    this.Rows[i].DefaultCellStyle.BackColor = System.Drawing.Color.White;
                i += 1;
            }

        }
        protected override void OnCurrentCellDirtyStateChanged(EventArgs e)
        {
            base.OnCurrentCellDirtyStateChanged(e);
            if (this.IsCurrentCellDirty)
            {
                this.CommitEdit(DataGridViewDataErrorContexts.Commit);
            }
        }
        protected override void OnRowPostPaint(DataGridViewRowPostPaintEventArgs e)
        {
            base.OnRowPostPaint(e);
            e.Graphics.DrawString((e.RowIndex + 1).ToString(), e.InheritedRowStyle.Font, solidBrush, e.RowBounds.Location.X + 15, e.RowBounds.Location.Y + 5);
        }
    }
}
//---------------------------------------------------------------------
//THIS CODE AND INFORMATION ARE PROVIDED AS IS WITHOUT WARRANTY OF ANY
//KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
//IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
//PARTICULAR PURPOSE.
//---------------------------------------------------------------------
namespace DataGridViewProgress
{
    public class DataGridViewProgressColumn : DataGridViewImageColumn
    {
        public DataGridViewProgressColumn()
        {
            CellTemplate = new DataGridViewProgressCell();
        }
    }
}
namespace DataGridViewProgress
{
    class DataGridViewProgressCell : DataGridViewImageCell
    {
        // Used to make custom cell consistent with a DataGridViewImageCell
        static Image emptyImage;
        static DataGridViewProgressCell()
        {
            emptyImage = new Bitmap(1, 1, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
        }
        public DataGridViewProgressCell()
        {
            this.ValueType = typeof(int);
        }
        // Method required to make the Progress Cell consistent with the default Image Cell. 
        // The default Image Cell assumes an Image as a value, although the value of the Progress Cell is an int.
        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)
        {
            int progressVal;
            if (value != null)
                progressVal = (int)value;
            else
                progressVal = 0; 


            float percentage = ((float)progressVal / 100.0f); // Need to convert to float before division; otherwise C# returns int which is 0 for anything but 100%.
            Brush backColorBrush = new SolidBrush(cellStyle.BackColor);
            Brush foreColorBrush = new SolidBrush(cellStyle.ForeColor);
            // Draws the cell grid
            base.Paint(g, clipBounds, cellBounds,
             rowIndex, cellState, value, formattedValue, errorText,
             cellStyle, advancedBorderStyle, (paintParts & ~DataGridViewPaintParts.ContentForeground));
            if (percentage > 0.0 || System.Math.Abs( percentage-0.0)<float.Epsilon)
            {
                // Draw the progress bar and the text
                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(progressVal.ToString() + "%", cellStyle.Font, foreColorBrush, cellBounds.X + 6, cellBounds.Y + 2);
            }
            else
            {
                // draw the text
                //if (this.DataGridView.CurrentRow.Index == rowIndex)
                //    g.DrawString(progressVal.ToString() + "%", cellStyle.Font, new SolidBrush(cellStyle.SelectionForeColor), cellBounds.X + 6, cellBounds.Y + 2);
                //else
                    g.DrawString(progressVal.ToString() + "%", cellStyle.Font, foreColorBrush, cellBounds.X + 6, cellBounds.Y + 2);
            }
        }
    }
}