导出模型到excel/csv web api通用方法

 [HttpGet]
        [Route("export")]
        public HttpResponseMessage Export([FromUri] int projectId)
        {
            StringWriter sw = new StringWriter();
            sw.WriteLine("'"KeyId'",'"PageName'",'"KeyType'",'"KeyName'",'"LanguageCode'"," +
                         "'"KeyStatus'",'"KeyValue'",'"DateCreated'",'"DateChanged'",'"UserId'",'"KeysCount'"");
            var export = _projectService.GetExportModel(projectId);
            foreach (var row in export)
            {
                sw.WriteLine(string.Format("'"{0}'",'"{1}'",'"{2}'",'"{3}'",'"{4}'"," +
                                           "'"{5}'",'"{6}'",'"{7}'",'"{8}'",'"{9}'"",
                                           row.KeyId, row.PageName, row.KeyType, row.LanguageCode,
                                           row.KeyStatus,row.KeyValue, row.DateCreated, row.DateChanged,
                                           row.UserId, row.KeysCount));
            }
            var res = Request.CreateResponse(HttpStatusCode.OK);
            res.Content = new StringContent(sw.ToString(), Encoding.UTF8, "text/csv");
            res.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment") { FileName = "Export.csv" };
            return res;
        }

public class ExportExcelModel
    {
        public long KeyId { get; set; }
        public string PageName { get; set; }
        public KeyType KeyType { get; set; }
        public string KeyName { get; set; }
        public string LanguageCode { get; set; }
        public KeyValueStatus KeyStatus { get; set; }
        public string KeyValue { get; set; }
        public DateTime DateCreated { get; set; }
        public DateTime? DateChanged { get; set; }
        public int UserId { get; set; }
        public long KeysCount { get; set; }
    }

我知道我来晚了一点，但我想这可能对别人有帮助。

我使用NPOI包开发了一个excel实用程序，它可以

1. 简单地获取您的数据表或集合
2. 并返回excel，同时保持excel中所有数据表/列表数据类型完整。

Github Code repo。: https://github.com/ansaridawood/.NET-Generic-Excel-Export-Sample/tree/master/GenericExcelExport/ExcelExport

寻找代码解释，你可以在这里找到:https://www.codeproject.com/Articles/1241654/Export-to-Excel-using-NPOI-Csharp-and-WEB-API

它使用NPOI DLL并包含两个cs文件，然后你就可以开始了

下面是第一个可供参考的文件AbstractDataExport.cs:

using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net;
using System.Net.Http;
using System.Net.Http.Headers;
namespace GenericExcelExport.ExcelExport
{
    public interface IAbstractDataExport
    {
        HttpResponseMessage Export(List exportData, string fileName, string sheetName);
    }
    public abstract class AbstractDataExport : IAbstractDataExport
    {
        protected string _sheetName;
        protected string _fileName;
        protected List _headers;
        protected List _type;
        protected IWorkbook _workbook;
        protected ISheet _sheet;
        private const string DefaultSheetName = "Sheet1";
        public HttpResponseMessage Export
              (List exportData, string fileName, string sheetName = DefaultSheetName)
        {
            _fileName = fileName;
            _sheetName = sheetName;
            _workbook = new XSSFWorkbook(); //Creating New Excel object
            _sheet = _workbook.CreateSheet(_sheetName); //Creating New Excel Sheet object
            var headerStyle = _workbook.CreateCellStyle(); //Formatting
            var headerFont = _workbook.CreateFont();
            headerFont.IsBold = true;
            headerStyle.SetFont(headerFont);
            WriteData(exportData); //your list object to NPOI excel conversion happens here
            //Header
            var header = _sheet.CreateRow(0);
            for (var i = 0; i < _headers.Count; i++)
            {
                var cell = header.CreateCell(i);
                cell.SetCellValue(_headers[i]);
                cell.CellStyle = headerStyle;
            }
            for (var i = 0; i < _headers.Count; i++)
            {
                _sheet.AutoSizeColumn(i);
            }
            using (var memoryStream = new MemoryStream()) //creating memoryStream
            {
                _workbook.Write(memoryStream);
                var response = new HttpResponseMessage(HttpStatusCode.OK)
                {
                    Content = new ByteArrayContent(memoryStream.ToArray())
                };
                response.Content.Headers.ContentType = new MediaTypeHeaderValue
                       ("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
                response.Content.Headers.ContentDisposition = 
                       new ContentDispositionHeaderValue("attachment")
                {
                    FileName = $"{_fileName}_{DateTime.Now.ToString("yyyyMMddHHmmss")}.xlsx"
                };
                return response;
            }
        }
        //Generic Definition to handle all types of List
        public abstract void WriteData(List exportData);
    }
}

，这是第二个也是最后一个文件AbstractDataExportBridge.cs:

using NPOI.SS.UserModel;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Text.RegularExpressions;
namespace GenericExcelExport.ExcelExport
{
    public class AbstractDataExportBridge : AbstractDataExport
    {
        public AbstractDataExportBridge()
        {
            _headers = new List<string>();
            _type = new List<string>();
        }
        public override void WriteData<T>(List<T> exportData)
        {
            PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(T));
            DataTable table = new DataTable();
            foreach (PropertyDescriptor prop in properties)
            {
                var type = Nullable.GetUnderlyingType(prop.PropertyType) ?? prop.PropertyType;
                _type.Add(type.Name);
                table.Columns.Add(prop.Name, Nullable.GetUnderlyingType(prop.PropertyType) ?? 
                                  prop.PropertyType);
                string name = Regex.Replace(prop.Name, "([A-Z])", " $1").Trim(); //space separated 
                                                                           //name by caps for header
                _headers.Add(name);
            }
            foreach (T item in exportData)
            {
                DataRow row = table.NewRow();
                foreach (PropertyDescriptor prop in properties)
                    row[prop.Name] = prop.GetValue(item) ?? DBNull.Value;
                table.Rows.Add(row);
            }
            IRow sheetRow = null;
            for (int i = 0; i < table.Rows.Count; i++)
            {
                sheetRow = _sheet.CreateRow(i + 1);
                for (int j = 0; j < table.Columns.Count; j++)
                {
                    ICell Row1 = sheetRow.CreateCell(j);
                    string type = _type[j].ToLower();
                    var currentCellValue = table.Rows[i][j];
                    if (currentCellValue != null && 
                        !string.IsNullOrEmpty(Convert.ToString(currentCellValue)))
                    {
                        if (type == "string")
                        {
                            Row1.SetCellValue(Convert.ToString(currentCellValue));
                        }
                        else if (type == "int32")
                        {
                            Row1.SetCellValue(Convert.ToInt32(currentCellValue));
                        }
                        else if (type == "double")
                        {
                            Row1.SetCellValue(Convert.ToDouble(currentCellValue));
                        }
                    }
                    else
                    {
                        Row1.SetCellValue(string.Empty);
                    }
                }
            }
        }
    }
}

详细说明请参考开头提供的链接