Question

我正在尝试将列表导出为CSV文件。我完成了所有工作，我想写入文件到响应流。这没有任何作用。

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();
        }

但在Response.Write(sw)之后什么也没发生。甚至可以这样保存文件吗？

问候

修改
单击按钮时看到的响应标题是：

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

对我来说似乎没问题。

修改
我摆脱了jQuery部分用一个超链接替换它，现在这对我来说很好用：

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

Answer 1

yan.kun走在正确的轨道上，但这要容易得多。

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

Answer 2

使用MVC，您只需返回如下文件：

public ActionResult ExportData()
{
    System.IO.FileInfo exportFile = //create your ExportFile
    return File(exportFile.FullName, "text/csv", string.Format("Export-{0}.csv", DateTime.Now.ToString("yyyyMMdd-HHmmss")));
}

Answer 3

除了Biff MaGriff的回答。要使用JQuery导出文件，请将用户重定向到新页面。

$('#btn_export').click(function () {
    window.location.href = 'NewsLetter/Export';
});

Answer 4

如果你摆脱了字符串编写器会发生什么：

        Response.Clear();
        Response.AddHeader("Content-Disposition", "attachment; filename=adressenbestand.csv");
        Response.ContentType = "text/csv";
        //write the header
        Response.Write(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))
        {
            Response.Write(String.Format("{0},{1},{2},{3}", record.EmailAddress, record.Gender.HasValue ? resourceManager.GetString(record.Gender.ToString()) : "", record.FirstName, record.LastName));
        }

        Response.End();

Answer 5

尊重Biff，这里有一些调整让我使用该方法从jQuery / Post对服务器反弹CSV并作为CSV提示返回给用户。

    [Themed(false)]
    public FileContentResult DownloadCSV()
    {

        var csvStringData = new StreamReader(Request.InputStream).ReadToEnd();

        csvStringData = Uri.UnescapeDataString(csvStringData.Replace("mydata=", ""));

        return File(new System.Text.UTF8Encoding().GetBytes(csvStringData), "text/csv", "report.csv");
    }

如果您从包含以下代码的表单中获取此内容，则需要使用unescape行

    var input = $("<input>").attr("type", "hidden").attr("name", "mydata").val(data);
    $('#downloadForm').append($(input));
    $("#downloadForm").submit();

Answer 6

从视图中的按钮调用.click（调用一些java脚本）。从那里通过window.location.href =＆＃39; Controller / Method＆＃39 ;;

调用控制器方法

在控制器中执行数据库调用并获取数据表或调用某个方法将数据库表中的数据获取到数据表然后执行以下操作，

using (DataTable dt = new DataTable())
                        {
                            sda.Fill(dt);
                            //Build the CSV file data as a Comma separated string.
                            string csv = string.Empty;
                            foreach (DataColumn column in dt.Columns)
                            {
                                //Add the Header row for CSV file.
                                csv += column.ColumnName + ',';
                            }
                            //Add new line.
                            csv += "\r\n";
                            foreach (DataRow row in dt.Rows)
                            {
                                foreach (DataColumn column in dt.Columns)
                                {
                                    //Add the Data rows.
                                    csv += row[column.ColumnName].ToString().Replace(",", ";") + ',';
                                }
                                //Add new line.
                                csv += "\r\n";
                             }
                             //Download the CSV file.
                             Response.Clear();
                             Response.Buffer = true;
                             Response.AddHeader("content-disposition", "attachment;filename=SqlExport"+DateTime.Now+".csv");
                             Response.Charset = "";
                             //Response.ContentType = "application/text";
                             Response.ContentType = "application/x-msexcel";
                             Response.Output.Write(csv);
                             Response.Flush();
                             Response.End();
                           }

Answer 7

即使您已经解决了问题，也可以尝试使用mvc导出csv。

return new FileStreamResult(fileStream, "text/csv") { FileDownloadName = fileDownloadName };

Answer 8

我认为你忘了使用

  Response.Flush();

下的

  Response.Write(sw);

请检查

Answer 9

简单的excel文件在mvc 4中创建

公共ActionResult结果（） { return File（new System.Text.UTF8Encoding（）。GetBytes（＆＃34; string data＆＃34;），＆＃34; application / csv＆＃34;，＆＃34; filename.csv＆＃34;）; }

使用MVC，C＃和jQuery导出到CSV

9 个答案: