/// <summary>
        /// 转换成工作簿
        /// </summary>
        /// <typeparam name="T">实体</typeparam>
        /// <param name="source">数据源</param>
        /// <param name="excelFile">文件路径</param>
        /// <param name="sheetName">工作表名</param>
        /// <returns></returns>
        internal static IWorkbook ToWorkbook <T>(this IEnumerable <T> source, string excelFile, string sheetName)
        {
            // 静态属性还是实例属性
            var properties =
                typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty);
            // 获取Fluent配置
            bool fluentConfigEnabled = false;
            IFluentConfiguration fluentConfig;

            if (Excel.Setting.FluentConfigs.TryGetValue(typeof(T), out fluentConfig))
            {
                fluentConfigEnabled = true;
            }
            // 获取单元格设置
            var cellConfigs = new CellConfig[properties.Length];

            for (var i = 0; i < properties.Length; i++)
            {
                PropertyConfiguration pc;
                var property = properties[i];
                // 优先获取配置(高优先级),没有则获取属性
                if (fluentConfigEnabled && fluentConfig.PropertyConfigs.TryGetValue(property, out pc))
                {
                    cellConfigs[i] = pc.CellConfig;
                }
                else
                {
                    var attrs = property.GetCustomAttributes(typeof(NpoiColumnAttribute), true) as NpoiColumnAttribute[];
                    if (attrs != null && attrs.Length > 0)
                    {
                        cellConfigs[i] = attrs[0].CellConfig;
                    }
                    else
                    {
                        cellConfigs[i] = null;
                    }
                }
            }
            // 初始化工作簿
            var workbook = InitializeWorkbook(excelFile);
            // 创建工作表
            var sheet = workbook.GetOrCreateSheet(sheetName);
            // 缓存单元格样式
            var cellStyles = new Dictionary <int, ICellStyle>();
            // 标题行单元格样式
            var titleStyle = workbook.CreateCellStyle();

            titleStyle.Alignment         = HorizontalAlignment.Center;
            titleStyle.VerticalAlignment = VerticalAlignment.Center;
            //titleStyle.FillPattern=FillPattern.Bricks;
            titleStyle.FillBackgroundColor = HSSFColor.Grey40Percent.Index;
            titleStyle.FillForegroundColor = HSSFColor.White.Index;
            var titleRow = sheet.GetOrCreateRow(0);
            var rowIndex = 1;

            foreach (var item in source)
            {
                var row = sheet.GetOrCreateRow(rowIndex);
                for (int i = 0; i < properties.Length; i++)
                {
                    var property = properties[i];
                    int index    = i;
                    var config   = cellConfigs[i];
                    if (config != null)
                    {
                        if (config.IsIgnored)
                        {
                            continue;
                        }
                        index = config.Index;
                    }
                    // 首次
                    if (rowIndex == 1)
                    {
                        //如果没有标题,则使用属性名称作为标题
                        var title = property.Name;
                        if (config != null)
                        {
                            if (!string.IsNullOrWhiteSpace(config.Title))
                            {
                                title = config.Title;
                            }
                            if (!string.IsNullOrWhiteSpace(config.Formatter))
                            {
                                try
                                {
                                    var style      = workbook.CreateCellStyle();
                                    var dataFormat = workbook.CreateDataFormat();
                                    style.DataFormat = dataFormat.GetFormat(config.Formatter);
                                    cellStyles[i]    = style;
                                }
                                catch (Exception ex)
                                {
                                    System.Diagnostics.Debug.WriteLine(ex.ToString());
                                }
                            }
                            var titleCell = titleRow.GetOrCreateCell(index);
                            titleCell.CellStyle = titleStyle;
                            titleCell.SetCellValue(title);
                        }
                    }
                    var value = property.GetValue(item, null);
                    if (value == null)
                    {
                        continue;
                    }
                    var        cell = row.GetOrCreateCell(index);
                    ICellStyle cellStyle;
                    if (cellStyles.TryGetValue(i, out cellStyle))
                    {
                        cell.CellStyle = cellStyle;
                    }
                    var unwrapType = property.PropertyType.UnwrapNullableType();
                    cell.SetCellValueExt(value, unwrapType, config.CustomEnum, config.Formatter);
                }
                rowIndex++;
            }
            // 合并单元格
            var mergableConfigs = cellConfigs.Where(c => c != null && c.AllowMerge).ToList();

            if (mergableConfigs.Any())
            {
                // 合并单元格样式
                var vStyle = workbook.CreateCellStyle();
                vStyle.VerticalAlignment = VerticalAlignment.Center;
                foreach (var config in mergableConfigs)
                {
                    object previous = null;
                    int    rowspan = 0, row = 1;
                    for (row = 1; row < rowIndex; row++)
                    {
                        var value = sheet.GetRow(row).GetCellValue(config.Index);
                        if (object.Equals(previous, value) && value != null)
                        {
                            rowspan++;
                        }
                        else
                        {
                            if (rowspan > 1)
                            {
                                sheet.GetRow(row - rowspan).Cells[config.Index].CellStyle = vStyle;
                                sheet.AddMergedRegion(new CellRangeAddress(row - rowspan, row - 1, config.Index,
                                                                           config.Index));
                            }
                            rowspan  = 1;
                            previous = value;
                        }
                    }
                    // 什么情况下——>所有行都需要合并
                    if (rowspan > 1)
                    {
                        sheet.GetRow(row - rowspan).Cells[config.Index].CellStyle = vStyle;
                        sheet.MergeCell(row - rowspan, row - 1, config.Index, config.Index);
                    }
                }
            }
            if (rowIndex > 1)
            {
                var statisticsConfigs = new List <StatisticsConfig>();
                var filterConfigs     = new List <FilterConfig>();
                var freezeConfigs     = new List <FreezeConfig>();
                if (fluentConfigEnabled)
                {
                    statisticsConfigs.AddRange(fluentConfig.StatisticsConfigs);
                    filterConfigs.AddRange(fluentConfig.FilterConfigs);
                    freezeConfigs.AddRange(fluentConfig.FreezeConfigs);
                }
                else
                {
                    var statistics =
                        typeof(T).GetCustomAttributes(typeof(NpoiStatisticsAttribute), true) as NpoiStatisticsAttribute[];
                    if (statistics != null && statistics.Length > 0)
                    {
                        foreach (var item in statistics)
                        {
                            statisticsConfigs.Add(item.StatisticsConfig);
                        }
                    }
                    var freezes =
                        typeof(T).GetCustomAttributes(typeof(NpoiFreezeAttribute), true) as NpoiFreezeAttribute[];
                    if (freezes != null && freezes.Length > 0)
                    {
                        foreach (var item in freezes)
                        {
                            freezeConfigs.Add(item.FreezeConfig);
                        }
                    }
                    var filters =
                        typeof(T).GetCustomAttributes(typeof(NpoiFilterAttribute), true) as NpoiFilterAttribute[];
                    if (filters != null && filters.Length > 0)
                    {
                        foreach (var item in filters)
                        {
                            filterConfigs.Add(item.FilterConfig);
                        }
                    }
                }
                // 统计行
                foreach (var item in statisticsConfigs)
                {
                    var lastRow = sheet.CreateRow(rowIndex);
                    var cell    = lastRow.CreateCell(0);
                    cell.SetCellValue(item.Name);
                    foreach (var column in item.Columns)
                    {
                        cell             = lastRow.CreateCell(column);
                        cell.CellFormula =
                            $"{item.Formula}({GetCellPosition(1, column)}:{GetCellPosition(rowIndex - 1, column)})";
                    }
                    rowIndex++;
                }
                // 设置冻结窗格
                foreach (var item in freezeConfigs)
                {
                    sheet.CreateFreezePane(item.ColSplit, item.RowSplit, item.LeftMostColumn, item.TopRow);
                }
                // 设置自动筛选
                foreach (var item in filterConfigs)
                {
                    sheet.SetAutoFilter(new CellRangeAddress(item.FirstRow, item.LastRow ?? rowIndex, item.FirstCol,
                                                             item.LastCol));
                }
            }
            // 自动调整所有列
            for (int i = 0; i < properties.Length; i++)
            {
                sheet.AutoSizeColumn(i);
            }
            return(workbook);
        }
Esempio n. 2
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 /// <summary>
 /// 初始化一个<see cref="NpoiColumnAttribute"/>类型的实例
 /// </summary>
 public NpoiColumnAttribute()
 {
     CellConfig = new CellConfig();
 }