使用MVC，C#和jQuery导出为CSV [英] Export to CSV using MVC, C# and jQuery

问题描述

我正在尝试将列表导出到CSV文件. 我完成了所有工作，直到我想将文件写入响应流.这什么也没做.

I am trying to export a list to a CSV file. I got it all working up to the point I want to write to file to the response stream. This doesn't do anything.

这是我的代码:

从页面调用方法.

$('#btn_export').click(function () {
         $.post('NewsLetter/Export');
});

控制器中的代码如下:

[HttpPost]
        public void Export()
        {
            try
            {
                var filter = Session[FilterSessionKey] != null ? Session[FilterSessionKey] as SubscriberFilter : new SubscriberFilter();

                var predicate = _subscriberService.BuildPredicate(filter);
                var compiledPredicate = predicate.Compile();
                var filterRecords = _subscriberService.GetSubscribersInGroup().Where(x => !x.IsDeleted).AsEnumerable().Where(compiledPredicate).GroupBy(s => s.Subscriber.EmailAddress).OrderBy(x => x.Key);

                ExportAsCSV(filterRecords);
            }
            catch (Exception exception)
            {
                Logger.WriteLog(LogLevel.Error, exception);
            }
        }

        private void ExportAsCSV(IEnumerable<IGrouping<String, SubscriberInGroup>> filterRecords)
        {
            var sw = new StringWriter();
            //write the header
            sw.WriteLine(String.Format("{0},{1},{2},{3}", CMSMessages.EmailAddress, CMSMessages.Gender, CMSMessages.FirstName, CMSMessages.LastName));

            //write every subscriber to the file
            var resourceManager = new ResourceManager(typeof(CMSMessages));
            foreach (var record in filterRecords.Select(x => x.First().Subscriber))
            {
                sw.WriteLine(String.Format("{0},{1},{2},{3}", record.EmailAddress, record.Gender.HasValue ? resourceManager.GetString(record.Gender.ToString()) : "", record.FirstName, record.LastName));
            }

            Response.Clear();
            Response.AddHeader("Content-Disposition", "attachment; filename=adressenbestand.csv");
            Response.ContentType = "text/csv";
            Response.Write(sw);
            Response.End();
        }

但是在Response.Write(sw)之后什么也没有发生.甚至可以用这种方式保存文件吗?

But after Response.Write(sw) nothing is happening. Is it even possible to save a file this way?

致谢

修改
单击按钮时看到的响应标题为:

Edit
The response headers I see when I click the button are:

HTTP/1.1 200 OK
Cache-Control: private
Content-Type: text/csv; charset=utf-8
Server: Microsoft-IIS/7.5
X-AspNetMvc-Version: 2.0
Content-Disposition: attachment; filename=adressenbestand.csv
X-Powered-By: ASP.NET
Date: Wed, 12 Jan 2011 13:05:42 GMT
Content-Length: 113

对我来说似乎还可以.

修改
我摆脱了jQuery部分，用超链接代替了它，现在对我来说很好用:

Edit
I got rid of the jQuery part en replaced it by an hyperlink and this is working fine for me now:

<a class="export" href="NewsLetter/Export">exporteren</a>

推荐答案

yan.kun步入正轨，但这要容易得多.

yan.kun was on the right track but this is much much easier.

    public FileContentResult DownloadCSV()
    {
        string csv = "Charlie, Chaplin, Chuckles";
        return File(new System.Text.UTF8Encoding().GetBytes(csv), "text/csv", "Report123.csv");
    }

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