尚未指定运行报告所需的一个或多个参数

我正在尝试直接打印RDLC文件而不显示Microsoft Report Viewer,我已经按照MSDN的示例进行了操作但是现在,每次我调用LocalReport类实例的"Render"方法时,它都会抛出"所需的一个或多个参数"运行报告尚未指定." 例外.

谁能告诉我哪些参数是我错过的？或者如何找到有关此例外的更多详细信息？

        LocalReport report = new LocalReport();
        report.ReportPath = System.Windows.Forms.Application.StartupPath + "\\" + rdlcFileName;
        report.EnableExternalImages = true;

        ReportParameter[] reportParams = new ReportParameter[]
        {
            new ReportParameter("LogoAddress", settings.LogoFileName),
            new ReportParameter("FooterValue", settings.InvoicesFooter)
        };
        report.SetParameters(reportParams);

        report.DataSources.Add(new ReportDataSource("Invoice", new PrintableInvoice[] { invoice }));
        report.DataSources.Add(new ReportDataSource("InvoiceItem", invoiceItems));

        Warning[] warnings;
        try
        {
            string deviceInfo =
                "" +
                "  EMF" +
                "  8.5in" +
                "  11in" +
                "  0.25in" +
                "  0.25in" +
                "  0.25in" +
                "  0.25in" +
                "";

            m_streams = new List();
            report.Render("Image", deviceInfo, _CreateStream, out warnings);

            foreach( Stream stream in m_streams )
                stream.Position = 0;
        }
        catch( Exception ex )
        {
            System.Diagnostics.Debug.WriteLine(ex.Message);
        }

并且_CreateStream是:

    private Stream _CreateStream(string name, string fileNameExtension, Encoding encoding, string mimeType, bool willSeek)
    {
        Stream stream = new FileStream(name + "." + fileNameExtension, FileMode.Create);
        m_streams.Add(stream);
        return stream;
    }

Gerrie Preto.. 15

我刚刚发现如果你将参数值作为空字符串传递,如参数="",它会给你这个错误

我花了一段时间

我刚刚发现如果你将参数值作为空字符串传递,如参数="",它会给你这个错误

我花了一段时间

在参数属性中允许null将解决此问题.