C# 显示“错误”的本地RDLC报告，其中应显示报告参数

我正在使用RDLC VS2010在网页MVC3上将一个简单的装运标签呈现为PDF。我有一个参数需要传递给RDLC ShipmentId。我传递了该参数，并且报告正确呈现，除了应该显示我传递的参数的文本框

RDLC上的文本框的值设置为“=参数！”！ShipmentId.Value'

我的代码是这样的：

    shipment.ShipmentId = "123TEST";

    Warning[] warnings;
    string mimeType;
    string[] streamids;
    string encoding;
    string filenameExtension;

    LocalReport report = new LocalReport();
    report.ReportPath = @"Labels\ShippingLabel.rdlc";
    report.Refresh();

    report.EnableExternalImages = true;

    ReportParameter param = new ReportParameter("ShipmentId", shipment.ShipmentId, true);
    report.SetParameters(param);

    report.Refresh();

    byte[] bytes = report.Render("PDF", null, out mimeType, out encoding, out filenameExtension, out streamids, out warnings);

    return new FileContentResult(bytes, mimeType);

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问题是ReportViewer在使用ProcessingMode.Local时不能有ReportParameters。相反，我将代码改为使用数据源而不是参数

        Warning[] warnings;
        string mimeType;
        string[] streamids;
        string encoding;
        string filenameExtension;

        var viewer = new ReportViewer();
        viewer.ProcessingMode = ProcessingMode.Local;

        viewer.LocalReport.ReportPath = @"Labels\ShippingLabel.rdlc";
        viewer.LocalReport.EnableExternalImages = true;

        var shipLabel = new ShippingLabel { ShipmentId = shipment.ShipmentId, Barcode = GetBarcode(shipment.ShipmentId) };

        viewer.LocalReport.DataSources.Add(new ReportDataSource("ShippingLabel", new List<ShippingLabel> { shipLabel }));
        viewer.LocalReport.Refresh();

        var bytes = viewer.LocalReport.Render("PDF", null, out mimeType, out encoding, out filenameExtension, out streamids, out warnings);