C＃实现给DevExpress中GridView表格指定列添加进度条显示效果——代码实现方式

一、问题描述

    在我们使用Winform配合DevExpress进行开发表格时，表格中的涉及到百分比数据的内容除了显示百分比的数字内容外，还希望搭配显示进度条效果（且低于百分之60的内容用红色表示不合格，高于百分之60的用绿色表示），这样百分比的显示效果更加清晰直观。

 

二、实现方法

2.1、先注册单元格绘制方法

 

2.2、编写给指定单元格绘制进度条的方法

        #region   给表格指定列绘制进度条

        /// <summary>
        /// 给指定列绘制进度条
        /// </summary>
        /// <param name="gridView">GridView控件</param>
        /// <param name="columnFieldName">需绘制进度条列的字段名称</param>
        /// <param name="warningValue">警告值（用于区分不同的颜色）</param>
        /// <param name="beforeWaringValueColor">警告值前的进度条颜色</param>
        /// <param name="afterWaringValueColor">警告值后的进度条颜色</param>
        public static void DrawProgressBarToColumn(DevExpress.XtraGrid.Views.Grid.GridView gridView, string columnFieldName, 
            double warningValue = 60, Brush beforeWaringValueColor = null, Brush afterWaringValueColor = null)
        {
            var column = gridView.Columns[columnFieldName];
            if (column == null) return;
            column.AppearanceCell.Options.UseTextOptions = true;
            //设置该列显示文本内容的位置（这里默认居中）
            column.AppearanceCell.TextOptions.HAlignment = HorzAlignment.Center;
            //绘制事件方法(前提需要先注册才能够接收到参数使用)
            gridView.CustomDrawCell += (s, e) =>
            {
                if (e.Column.FieldName == columnFieldName)
                {
                    DrawProgressBar(e, warningValue, beforeWaringValueColor, afterWaringValueColor);
                    e.Handled = true;
                    DrawEditor(e);
                }
            };
        }

        /// <summary>
        /// 绘制进度条
        /// </summary>
        /// <param name="e">单元格绘制事件参数</param>
        /// <param name="warningValue">警告值（用于区分不同的颜色）</param>
        /// <param name="beforeWaringValueColor">警告值前的进度条颜色</param>
        /// <param name="afterWaringValueColor">警告值后的进度条颜色</param>
        public static void DrawProgressBar(DevExpress.XtraGrid.Views.Base.RowCellCustomDrawEventArgs e, double warningValue = 60,
            Brush beforeWaringValueColor = null, Brush afterWaringValueColor = null)
        {
            string tmpValue = e.CellValue.ToString();
            float percent = 0;
            if (!string.IsNullOrEmpty(tmpValue))
            {
                float.TryParse(tmpValue, out percent);
            }
            int width = 0;
            if (percent >2)
            {
                width = (int)(Math.Abs(percent / 100) * e.Bounds.Width);
            }
            else
            {
                width = (int)(Math.Abs(percent) * e.Bounds.Width);
            }
           
            Rectangle rect = new Rectangle(e.Bounds.X, e.Bounds.Y, width, e.Bounds.Height);

            Brush b = Brushes.Green;
            if (afterWaringValueColor != null)
            {
                b = afterWaringValueColor;
            }
            if (percent < warningValue)
            {
                if (beforeWaringValueColor == null)
                {
                    b = Brushes.Red;
                }
                else
                {
                    b = beforeWaringValueColor;
                }
            }
            e.Graphics.FillRectangle(b, rect);
        }

        /// <summary>
        /// 绘制单元格
        /// </summary>
        /// <param name="e">单元格绘制事件参数</param>
        public static void DrawEditor(DevExpress.XtraGrid.Views.Base.RowCellCustomDrawEventArgs e)
        {
            DevExpress.XtraGrid.Views.Grid.ViewInfo.GridCellInfo cell = e.Cell as DevExpress.XtraGrid.Views.Grid.ViewInfo.GridCellInfo;
            Point offset = cell.CellValueRect.Location;
            DevExpress.XtraEditors.Drawing.BaseEditPainter pb = cell.ViewInfo.Painter as DevExpress.XtraEditors.Drawing.BaseEditPainter;
            AppearanceObject style = cell.ViewInfo.PaintAppearance;
            if (!offset.IsEmpty)
                cell.ViewInfo.Offset(offset.X, offset.Y);
            try
            {
                pb.Draw(new DevExpress.XtraEditors.Drawing.ControlGraphicsInfoArgs(cell.ViewInfo, e.Cache, cell.Bounds));
            }
            finally
            {
                if (!offset.IsEmpty)
                {
                    cell.ViewInfo.Offset(-offset.X, -offset.Y);
                }
            }
        }

        #endregion 

 2.3、使用给指定单元格绘制进度条方法

    注意：在使用给指定单元格绘制进度条方法时（如果数字都是小于1的那么警告值也是需要小于1；如果是大于1的则按照需要设置即可）。

           
--使用方法语法
DrawProgressBarToColumn(gridView组件名称, 需要绘制进度条的单元格字段, 警告值,警告值前的进度条颜色,警告值后的进度条颜色);

--示例1
DrawProgressBarToColumn(gridView1, "Age", 0.6,Brushes.OrangeRed,Brushes.LawnGreen);


--示例2
DrawProgressBarToColumn(gridView1, "Age", 0.6, new SolidBrush(Color.FromArgb(236, 65, 65)), new SolidBrush(Color.FromArgb(45, 115, 186)));

三、相关内容

3.1、给单元格设置百分比

        /// <summary>
        /// 设置表格指定单元格都使用百分比
        /// </summary>
        /// <param name="gridView">gridView组件</param>
        /// <param name="columnName">列名称</param>
        public static void SetPercentage(GridView gridView, string columnName)
        {
            if (gridView != null && gridView.Columns.Count > 0 && !string.IsNullOrEmpty(columnName))
            {
                gridView.Columns[columnName].DisplayFormat.FormatType = FormatType.Numeric;
                gridView.Columns[columnName].DisplayFormat.FormatString = "P2";
            }
        }

上面这个代码实现的是将小数转为百分比显示【比如将小数(0.3)使用后就转为（30%）显示】 

        /// <summary>
        /// 给表格指定单元格都保留2位小数后添加%号
        /// </summary>
        /// <param name="gridView"></param>
        /// <param name="startColumnIndex"></param>
        /// <param name="endColumnIndex"></param>
        public static void SetResreserveTwoBitAndPercentageChar(GridView gridView, int startColumnIndex, int endColumnIndex)
        {
            if (gridView != null && gridView.Columns.Count > 0 &&
               startColumnIndex > 0 && endColumnIndex > 0 &&
               endColumnIndex <= gridView.Columns.Count)
            {
                for (int i = startColumnIndex; i <= endColumnIndex; i++)
                {
                    gridView.Columns[i].DisplayFormat.FormatType = FormatType.Numeric;
                    gridView.Columns[i].DisplayFormat.FormatString = $"{0:N2}'%'";

                }
            }
        }

 上面这个代码实现的是给数字添加百分号符号显示【比如将小数(86.2356)使用后就转为（86.24%）显示】 

3.2、相关资料

GridView Class | WinForms Controls | DevExpress Documentationhttps://docs.devexpress.com/WindowsForms/DevExpress.XtraGrid.Views.Grid.GridView

GridView.CustomDrawCell Event | WinForms Controls | DevExpress Documentationhttps://docs.devexpress.com/WindowsForms/DevExpress.XtraGrid.Views.Grid.GridView.CustomDrawCell

RowCellCustomDrawEventArgs Class | WinForms Controls | DevExpress Documentationhttps://docs.devexpress.com/WindowsForms/DevExpress.XtraGrid.Views.Base.RowCellCustomDrawEventArgsBrush 类 (System.Drawing) | Microsoft Docshttps://docs.microsoft.com/zh-cn/dotnet/api/system.drawing.brush?view=dotnet-plat-ext-6.0Graphics.DrawEllipse 方法 (System.Drawing) | Microsoft Docshttps://docs.microsoft.com/zh-cn/dotnet/api/system.drawing.graphics.drawellipse?view=dotnet-plat-ext-6.0SolidBrush 类 (System.Drawing) | Microsoft Docshttps://docs.microsoft.com/zh-cn/dotnet/api/system.drawing.solidbrush?view=dotnet-plat-ext-6.0