在C＃中将数据导出为ex​​cel时，索引超出了数组的范围

Question

我有ASP.Net网站。以下是我将流写入excel的方法。

public void JsonToExcel(string jsonData, HttpResponseBase response)
    {
        try
        {
            ExcelPackage excel = new ExcelPackage();
            var worksheet = excel.Workbook.Worksheets.Add("Sheet1");
            //below line is throwing the error
            worksheet.Cells[1, 1].LoadFromCollection(jsonData, true);
            using (MemoryStream swObj = new MemoryStream())
            {
                string fileName = DateTime.Now.ToLongDateString() + ".xlsx";
                response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
                response.AddHeader("content-disposition", "attachment;  filename=" + fileName + "");
                excel.SaveAs(swObj);
                swObj.WriteTo(response.OutputStream);
                return;
            }

        }
        catch (Exception ex)
        {
            //handle exception
            return;
        }
        finally
        {
            response.Flush();
            response.End();
        }

在这一行的功能 - worksheet.Cells[1, 1].LoadFromCollection(jsonData, true);

我收到以下异常

  

索引超出了数组的范围

我尝试设置为worksheet.Cells[0,0]

我正在使用 EPPlus 4.1.0 包。

JSON示例： -

        string jsonData = @"jsonData = [
                    {
                        ""DocumentName"": ""Test Document"",
                        ""ActionDate"": ""2015-09-25T16:06:25.083"",
                        ""ActionType"": ""View"",
                        ""ActionPerformedBy"": ""Sreeja SJ""
                    },
                    {
                        ""DocumentName"": ""Test Document"",
                        ""ActionDate"": ""2015-09-25T16:12:02.497"",
                        ""ActionType"": ""View"",
                        ""ActionPerformedBy"": ""Sreeja SJ""
                    },
                    {
                        ""DocumentName"": ""Test Document"",
                        ""ActionDate"": ""2015-09-25T16:13:48.013"",
                        ""ActionType"": ""View"",
                        ""ActionPerformedBy"": ""Sreeja SJ""
                    }]";

Answer 1

我认为它是JSON和EPPlus方法的问题LoadFromCollection内部 LoadFromCollection方法需要一个集合，而不是一个任意字符串或其他东西，所以当我用Newtonsoft.Json将它反序列化为一个合适的类时似乎没问题。

using System;
using System.Collections.Generic;
using System.IO;
using Newtonsoft.Json;
using OfficeOpenXml;

namespace TestC
{
    public class PostData
    {
        public string DocumentName { get; set; }
        public DateTime ActionDate { get; set; }
        public string ActionType { get; set; }
        public string ActionPerformedBy { get; set; }
    }
    class Program
    {
        static void Main(string[] args)
        {
            using (ExcelPackage package = new ExcelPackage()) {
                var worksheet = package.Workbook.Worksheets.Add("Sheet1");
                string jsonData = @"[
                    {
                        ""DocumentName"": ""Test Document"",
                        ""ActionDate"": ""2015-09-25T16:06:25.083"",
                        ""ActionType"": ""View"",
                        ""ActionPerformedBy"": ""Sreeja SJ""
                    },
                    {
                        ""DocumentName"": ""Test Document"",
                        ""ActionDate"": ""2015-09-25T16:12:02.497"",
                        ""ActionType"": ""View"",
                        ""ActionPerformedBy"": ""Sreeja SJ""
                    },
                    {
                        ""DocumentName"": ""Test Document"",
                        ""ActionDate"": ""2015-09-25T16:13:48.013"",
                        ""ActionType"": ""View"",
                        ""ActionPerformedBy"": ""Sreeja SJ""
                    }]";

                List<PostData> dataForExcel = JsonConvert.DeserializeObject<List<PostData>>(jsonData);

                worksheet.Cells[1, 1].LoadFromCollection(dataForExcel, true);

                package.SaveAs(File.Create(@"C:\Users\User\Documents\sample.xlsx"));
            }
        }
    }
}

结果：

要在Excel中输出正确的日期，您应该为第二列（ActionDate）中从第二行到结尾的单元格应用正确的数字格式：

worksheet.Cells[2, 2, worksheet.Dimension.End.Row, 2].Style.Numberformat.Format = "yyyy-mm-ddThh:mm:ss.000";