您尝试打开的文件的格式与Asp.Net中文件扩展名所指定的格式不同 [英] the file you are trying to open is in a different format than specified by the file extension in Asp.Net

问题描述

这是我的代码，你尝试打开的文件的格式不同于文件扩展名c＃错误中指定的格式。

  public ActionResult Export（string filterBy）
 {
 MemoryStream output = new MemoryStream（）; 
 StreamWriter writer = new StreamWriter（output，Encoding.UTF8）; 
 
 var data = City.GetAll（）。选择（o => new 
 {
 CountryName = o.CountryName，
 StateName = o.StateName，
 o.City.Name，
 Title = o.City.STDCode 
}）。ToList（）; 
 var grid = new GridView {DataSource = data}; 
 grid.DataBind（）; 
 var htw = new HtmlTextWriter（writer）; 
 
 grid.RenderControl（htw）; 
 
 writer.Flush（）; 
 output.Position = 0; 
 
 return File（输出，application / vnd.ms-excel，test.xls）; 
 
} 
  

当我尝试打开excel我得到这个错误

您尝试打开的文件的格式与文件扩展名指定的
不同的格式

单击是后，文件正确打开。但我不希望这个msg出现。

解决方案

我已经使用了 CloseXML 来解决问题。

  public static void ExportToExcel IEnumerable< dynamic> data，string sheetName）
 {
 XLWorkbook wb = new XLWorkbook（）; 
 var ws = wb.Worksheets.Add（sheetName）; 
 ws.Cell（2，1）.InsertTable（data）; 
 HttpContext.Current.Response.Clear（）; 
 HttpContext.Current.Response.ContentType =application / vnd.openxmlformats-officedocument.spreadsheetml.sheet; 
 HttpContext.Current.Response.AddHeader（content-disposition，String.Format（@attachment; filename = {0} .xlsx，sheetName.Replace（，_）））; 
 
使用（MemoryStream memoryStream = new MemoryStream（））
 {
 wb.SaveAs（memoryStream）; 
 memoryStream.WriteTo（HttpContext.Current.Response.OutputStream）; 
 memoryStream.Close（）; 
} 
 
 HttpContext.Current.Response.End（）; 
} 
  

在我的项目中使用 Nuget软件包管理器。

the file you are trying to open is in a different format than specified by the file extension c# error when trying to open file in excel.

Here is my code

public ActionResult Export(string filterBy)
{
    MemoryStream output = new MemoryStream();
    StreamWriter writer = new StreamWriter(output, Encoding.UTF8);

    var data = City.GetAll().Select(o => new
    {
        CountryName = o.CountryName,
        StateName = o.StateName,
        o.City.Name,
        Title = o.City.STDCode
    }).ToList();
    var grid = new GridView { DataSource = data };
    grid.DataBind();
    var htw = new HtmlTextWriter(writer);

    grid.RenderControl(htw);

    writer.Flush();
    output.Position = 0;

    return File(output, "application/vnd.ms-excel", "test.xls");

}

when am trying to open excel i get this error

the file you are trying to open is in a different format than specified by the file extension

After clicking on Yes the file open properly. but i don't want this msg to appear.

解决方案

I have used CloseXML to solve the problem.

public static void ExportToExcel(IEnumerable<dynamic> data, string sheetName)
{
    XLWorkbook wb = new XLWorkbook();
    var ws = wb.Worksheets.Add(sheetName);
    ws.Cell(2, 1).InsertTable(data);
    HttpContext.Current.Response.Clear();
    HttpContext.Current.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
    HttpContext.Current.Response.AddHeader("content-disposition", String.Format(@"attachment;filename={0}.xlsx",sheetName.Replace(" ","_")));

    using (MemoryStream memoryStream = new MemoryStream())
    {
        wb.SaveAs(memoryStream);
        memoryStream.WriteTo(HttpContext.Current.Response.OutputStream);
        memoryStream.Close();
    }

    HttpContext.Current.Response.End();
}

Installed ClosedXML in my project using Nuget Package Manager.

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