c# - 通过页面方法将 HTML 表格导出到 Excel

Question

我在客户端有以下代码，用于从 HTML 表中检索数据，然后通过页面方法将其发送到服务器:

function dtExportToCSV(dataTable) {
    var elements = dtDataToJSON(dataTable);
    var headers = dtHeadersToJSON(tableSelector);

    jQuery.ajax({
        type: "POST",
        url: "Report.aspx/exportToCSV",
        data: "{'elements': " + elements + ", 'headers': " + JSON.stringify(headers) + "}",
        contentType: "application/json; charset=utf-8",
        dataType: "json",

        success: function(msg) {
            if (msg.d) {
            } else {
            }
        },

        error: function(xhr, ajaxOptions, thrownError) {
            alert(xhr.statusText);
        }
    });
}

然后我在服务器端使用以下代码，将检索到的数据导出到 CSV 文件。

/// <summary>
/// 
/// </summary>
/// <param name="elements"></param>
/// <param name="headers"></param>
[WebMethod(EnableSession=true)]
[ScriptMethod(ResponseFormat = ResponseFormat.Json)]
public static bool exportToCSV(List<object> elements, List<string> headers)
{
    try
    {
        string attachmentType = "attachment; filename=ShortageReport.csv";

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

        writeHeadersInfo(headers);

        HttpContext.Current.Response.End();
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
    }

    return false;
}

但我得到了这个异常:无法评估表达式，因为代码已优化或 native 框架位于调用堆栈的顶部。

有谁知道如何处理这个问题？

任何帮助将不胜感激! 提前致谢!

~ Eder Quiñones

Answer 1

    /// <summary>
    /// 
    /// </summary>
    /// <param name="elements"></param>
    /// <param name="headers"></param>
    [WebMethod(EnableSession=true)]
    [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
    public static bool exportToCSV(List<object> elements, List<string> headers)
    {
        try
        {
            string attachmentType = "attachment; filename=Shortage Report.csv";

            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.ClearContent();
            HttpContext.Current.Response.ClearHeaders();

            HttpContext.Current.Response.AddHeader("Content-Disposition", attachmentType);
            HttpContext.Current.Response.ContentType = "text/csv";

            writeHeadersInfo(headers);
            writeBodyInfo(headers, elements);

            HttpContext.Current.ApplicationInstance.CompleteRequest();
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }

        return true;
    }

但它没有显示保存文件对话框...