基于NPOI的Excel导入导出类库

概述

支持多sheet导入导出。导出字段过滤，合并行。特性配置导入验证，非空验证，唯一验证，错误标注等

用于基础配置和普通报表的导入导出，对于复杂需求，比如公式，导出图片等暂不支持

GitHub地址：

https://github.com/Mike-Zrw/ExcelHelper/tree/master

导出配置支持

HeaderStyleAttribute ：列名样式，（颜色，字体，大小，加粗,对齐）
StringFormatterAttribute ：格式化时间
ColumnWidthAttribute：列宽，默认自适应，可通过这个特性配置最小列宽和最大列宽
RowMergedAttribute：合并行，需要配合ExportPrimaryKey使用
ExportTitle：导出标题，标题可选，可设置居中，颜色字体等。
SheetName sheetName不设置默认为sheet1，sheet2等
FilterColumn ：导出指定列。可根据选中的列名或者属性名导出指定的列

导入配置支持

ColumnRegexAttribute：正则判断，正则表达式判断单元格内容
ColumnRequiredAttribute：非空判断，对于不可为空的类型即使没有设置该特性，仍会进行非空判断，所以如果一个可以为空的int类型，请设置字段类型为int?
ColumnUniqueAttribute：唯一判断，若不加此特性，默认对所有列进行重复验证，可选择性的加在某几列上组合验证。通过ImportSheet的NeedUniqueValidation可配置是否开启重复验证，UniqueValidationPrompt设置重复时的提示
ImportSheet.ValidateHandler : 业务逻辑判断，业务逻辑判断在所有判断之后执行，可以通过IsValidated属性判断该行是否通过了其他验证，SetError()用来追加单元格的错误提示
HeaderRowIndex：列名所在行
ImportBook.DataErrorForegroundColor：错误前景色(红)
ImportBook.RepeatedErrorForegroundColor：重复前景色（黄）
ImportBook.DefaultForegroundColor：默认前景色（白），在验证未通过时，颜色处于错误或重复但验证通过的单元格颜色将重置为默认前景色。（即第一次导入错误，修改之后第二次部分导入正确，则正确的颜色会便会默认前景色）

导入结果说明

ImportSuccess ：是否导入成功
GetSummaryErrorMessage() : excel中的所有错误文字展示
GetNotDisplayErrorMessage(): 无法在excel中标注的错误信息，比如sheet格式不正确，excel格式不正确等
outPutStream：错误的单元格添加样式及标注输出到文件流中。如果不需要输出excel流，该参数可不传。

导出示例

 		var students = new List<ExportStudent>();
        var grades = new List<ExportGrade>();
        var schools = new List<ExportSchool>();
        for (int i = 0; i < 100; i++)
        {
            students.Add(new ExportStudent
            {
                Name = i % 6 == 1 ? null : ($"name{i}"),
                Age = i,
                Phone = i % 8 == 1 ? "adsf123" : $"{1}{new Random().Next(100, 999)}{1}{new Random().Next(100, 999)}{2}{new Random().Next(0, 9)}{3}",
                Birthday = i % 13 == 1 ? default(DateTime?) : DateTime.Now.AddDays(i),
                Money = Math.Round(new Random(i).NextDouble(), 2),
                SchoolDate = DateTime.Now.AddDays(i + 1),
            });
            grades.Add(new ExportGrade { Code = $"编码{i}", GradeName = $"{i}年级" });
            schools.Add(new ExportSchool { Name = $"{i}号学校", Address = $"学校地址{i}", Price = Math.Round(new Random().NextDouble(), 2) });
        }
        var exporter = new DefaultExcelExporter();

        var stream = new FileStream("D://export.xlsx", FileMode.Create, FileAccess.Write);
        //var stream = new MemoryStream();
        exporter.Export(new ExportBook()
        {
            Ext =ExtEnum.XLSX,
            Sheets = new List<ExportSheet> {
            new ExportSheet(){  SheetName="测试", Data=students},
            new ExportSheet(){   Data=grades},
            new ExportSheet(){   Data=schools,Title=new  ExportTitle("学校列表",true,18,default,Excel.Enums.HorizontalAlignEnum.Center),  FilterColumn=new List<string>(){ "学校名称","price" } },
            }
        }, stream);

        stream.Dispose();
		
		public class ExportStudent : ExportModel
        {
            [ColumnNameAttribute("名字")]
            public string Name { get; set; }
            [ColumnNameAttribute("年龄")]
            public int Age { get; set; }

            [ColumnNameAttribute("生日")]
            [StringFormatter("yyyy-MM-dd HH:mm:ss")]
            public DateTime? Birthday { get; set; }

            [ColumnStyle(FontName = "华文彩云")]
            [ColumnNameAttribute("入学时间")]
            [StringFormatter("yyyy-MM-dd")]
            public DateTime SchoolDate { get; set; }

            [ColumnStyle(FontColor = 211, IsBold = true)]
            [ColumnNameAttribute("零花钱")]
            public double Money { get; set; }

            [ColumnNameAttribute("电话")]
            public string Phone { get; set; }
        }

合并行导出示例

  public void ExportMergeRow()
    {
        var orders = new List<Order>();
        for (int i = 0; i < 100; i++)
        {
            var index = new Random(i).Next(i + 10, i + 13);
            var orderNumber = $"订单{index}";
            orders.Add(new Order()
            {
                Buyer = $"下单人{index}",
                Price = Math.Round(new Random(i).NextDouble(), 2),
                BuyQty = new Random(i).Next(1, 10),
                ProductName = $"商品{i}",
                OrderNumber = orderNumber,
                OrderNum2 = orderNumber,
                ExportPrimaryKey = orderNumber
            });
        }
        var exporter = new DefaultExcelExporter();

        var stream = new FileStream("D://exportorder.xlsx", FileMode.Create, FileAccess.Write);
        exporter.Export(new ExportBook()
        {
            Ext = ExtEnum.XLSX,
            Sheets = new List<ExportSheet> { new ExportSheet() { SheetName = "订单列表", Data = orders } }
        }, stream);

        stream.Dispose();
    }

导入示例

		var sheet1 = new ImportSheet<ImportStudent>
        {
            UniqueValidationPrompt = "零花钱不可重复",
            HeaderRowIndex = 0,
            SheetIndex = 0,
            ValidateHandler = (list) =>
            {
                foreach (ImportStudent model in list)
                {
                    if (model.IsValidated && model.Name == "name0")
                        model.SetError(nameof(model.Name), "名字不可为0");
                    if (model.IsValidated && model.Money < 0.5)
                        model.SetError(nameof(model.Money), "零花钱不可小于0.5");
                }
            }
        };
        var sheet2 = new ImportSheet<ImportGrade>
        {
            HeaderRowIndex = 0,
            SheetIndex = 1
        };
        var sheet3 = new ImportSheet<ImportSchool>
        {
            HeaderRowIndex = 1,
            SheetIndex = 2,
            ValidateHandler = (list) =>
            {

                foreach (var model in list)
                {
                    if (model.Price > 0.5)
                        model.SetError(nameof(model.Price), "学费不可大于0.5");
                }
            }
        };
        var import = new DefaultExcelImporter();
        using var inputStrem = new FileStream("D://export.xlsx", FileMode.OpenOrCreate, FileAccess.Read);
        using var outStrem = new FileStream("D://error.xlsx", FileMode.Create, FileAccess.Write);
        var bookmodel = new ImportBook();
        bookmodel.SetSheetModels(sheet1, sheet2, sheet3);
        var ret = import.ImportExcel(inputStrem, ExtEnum.XLSX, bookmodel, outStrem);
        var success = ret.ImportSuccess;
        var summaryErrorMsg = ret.GetSummaryErrorMessage();
        var notDisplayMsg = ret.GetNotDisplayErrorMessage();
        Output.WriteLine($"success:{success}");
        Output.WriteLine("summaryErrorMsg------------");
        Output.WriteLine(summaryErrorMsg);
        Output.WriteLine("notDisplayMsg------------");
        Output.WriteLine(notDisplayMsg);

		public class ImportStudent : ImportModel
	    {
	        [ColumnRequired("名字必填")]
	        [ColumnNameAttribute("名字")]
	        public string Name { get; set; }
	        [ColumnNameAttribute("年龄")]
	        public int Age { get; set; }
	
	        [ColumnRequired]
	        [ColumnNameAttribute("生日")]
	        public DateTime Birthday { get; set; }
	
	        [ColumnNameAttribute("入学时间")]
	        public DateTime SchoolDate { get; set; }
	
	        [ColumnUnique]
	        [ColumnNameAttribute("零花钱")]
	        public double Money { get; set; }
	
	        [ColumnNameAttribute("电话")]
	        [ColumnRegex(@"^[1]+[1-9]+\d{9}$", "电话格式不对")]
	        public string Phone { get; set; }
	    }