c# - 写入 CSV 然后保存或编辑

Question

我有一个问题。我在运行时创建一个 CSV，然后让用户能够保存或打开它，但它对我没有任何作用，我做错了什么？有人可以帮助我吗？

public void WriteToCSV(List<mifid2_vpc_monitored_detail_view> list, string filename)
    {
        string attachment = "attachment; filename=" + filename;

        HttpContext.Current.Response.Clear();
        HttpContext.Current.Response.ClearHeaders();
        HttpContext.Current.Response.ClearContent();
        HttpContext.Current.Response.AddHeader("content-disposition", attachment);
        HttpContext.Current.Response.ContentType = "text/csv";
        HttpContext.Current.Response.AddHeader("Pragma", "public");
        HttpContext.Current.Response.ContentEncoding = Encoding.UTF8;


        WriteHeader();
        StringBuilder csv = new StringBuilder();

        string _uti, _counterparty;
        DateTime _maturity, _date;
        decimal _volume;

        var newLine = "";

        for (int i = 0; i < list.Count; i++)
        {
            if (list[i].uti_cd == null) _uti = "-"; else _uti = list[i].uti_cd;
            if (list[i].namecounterparty == null) _counterparty = "-"; else _counterparty = list[i].namecounterparty;
            if (list[i].maturity == null) _maturity = DateTime.MinValue.Date; else _maturity = list[i].maturity;
            if (list[i].contract_volume == 0) _volume = 0; else _volume = list[i].contract_volume;
            if (list[i].evaluation_date == null) _date = DateTime.MinValue.Date; else _date = list[i].evaluation_date;

            newLine = string.Format("{0},{1},{2},{3},{4}", _uti, _counterparty, _maturity, _volume, _date);
            csv.AppendLine(newLine);
        }

        HttpContext.Current.Response.Write(csv.ToString());
        HttpContext.Current.Response.End();
    }

    private void WriteHeader()
    {
        string columnNames = "UTI code, Counterparty, Maturity, Volume, Evaluation Date";
        HttpContext.Current.Response.Write(columnNames);
        HttpContext.Current.Response.Write(Environment.NewLine);
    }

Answer 1

代码对我来说工作得很好。但是浏览器下载没有扩展名的文件。

filename 是否包含文件扩展名？

如果没有，试试这个

string attachment = "attachment; filename=" + filename + ".csv";