使用ClosedXML实现Excel导入导出
写在开头
游览Dotnet 基金会中的项目时，发现了这个库,Github 链接，它的性能非常好，详细见下图
话不多说，直接上代码吧！
导出
后端：
public static byte[] Output<T>(List<T> data, string sheetName) {using var workbook = new XLWorkbook();var worksheet = workbook.Worksheets.Add(sheetName);var properties = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);//表头for (int i = 0; i < properties.Length; i++){worksheet.Cell(1, i + 1).Value = properties[i].Name;}//值for (int row = 0; row < data.Count; row++){for (int col = 0; col < properties.Length; col++){var value = properties[col].GetValue(data[row], null);worksheet.Cell(row + 2, col + 1).Value = value?.ToString()??"" ;}}//保存至内存流using var ms = new MemoryStream();workbook.SaveAs(ms);ms.Position = 0;return ms.ToArray();}
[HttpGet("output")]public async Task<IActionResult> Output(){var data =new{字段1=1，字段2=“2”}；return File(ExcelHelper.Output(data,“标题”), "application/octet-stream", "output.xls");}
前端：
export function fileDownAction(url, parameter) {return request({//axiosurl: url,method: 'get',params: parameter,responseType: 'blob'})
}
let timeStamp = Date.parse(new Date()).toString().substring(0, 10)
fileDownAction(url + "/output", params).then((res) => {// 处理返回的文件流let url = window.URL.createObjectURL(new Blob([res]))let link = document.createElement('a')link.style.display = 'none'link.href = urllink.setAttribute('download', fileName + timeStamp + ".xls")document.body.appendChild(link)link.click()})
导入
后端：
public static async Task<IXLWorksheet> CreateTableAsync(IFormFile file){var ms = new MemoryStream();await file.CopyToAsync(ms);ms.Position = 0;var workbook = new XLWorkbook(ms);// 获取第一个工作表return workbook.Worksheet(1);}
//根据位置获取单元格的值
public static string GetCellValue(IXLWorksheet worksheet,string address){return worksheet.Cell(address).Value.ToString();//“B12”//return worksheet.Cell(row,column).Value.ToString(); }
//根据值获取单元格地址
public static IXLAddress GetCellAddress(IXLWorksheet worksheet,string cellName){return worksheet.CellsUsed(a=>a.Value.ToString()==cellName).First().Address;// 以下返回“B12”此类字符串//worksheet.CellsUsed(a=>a.Value.ToString()==cellName).First().ToString();}
前端代码我就不贴了，传入一个file对象即可
写在最后
如果觉得该库好用，可以去github点个star哦！
