SAP 晶体报告打印命令不起作用

Question

我是使用Visual Studio 10的SAP Crystal Reports的新手。我使用具有三个参数的存储过程在SAP Crystal Reports中生成了一个报告。报告加载良好，但是当我尝试打印并导出它时，会显示以下错误。

无法使用指定的选项导出。请检查您的选项，然后重试。

我还尝试在控件属性上硬输入ReportSource，但随后弹出登录信息，我需要提供用户名和密码。我想避免这种情况。这是我的代码：

private void loadreport(DateTime dt1, DateTime dt2, int cd)
    {
        ReportDocument reportDocument = new ReportDocument();
        ParameterField paramField = new ParameterField();
        ParameterDiscreteValue paramDiscreteValue = new ParameterDiscreteValue();
        ParameterFields paramFields = new ParameterFields();


        //Set instances for input parameter 1 -  @Dept
        paramField.Name = "@date1";
        //*Remember to reconstruct the paramDiscreteValue and paramField objects
        paramDiscreteValue.Value = dt1;
        paramField.CurrentValues.Add(paramDiscreteValue);
        //Add the paramField to paramFields
        paramFields.Add(paramField);
        ParameterField paramField2 = new ParameterField();
        ParameterDiscreteValue paramDiscreteValue2 = new ParameterDiscreteValue();
        paramField2.Name = "@date2";
        paramDiscreteValue2.Value = dt2;
        paramField2.CurrentValues.Add(paramDiscreteValue2);
        paramFields.Add(paramField2);

        ParameterField paramField3 = new ParameterField();
        ParameterDiscreteValue paramDiscreteValue3 = new ParameterDiscreteValue();
        paramField3.Name = "@cid";
        paramDiscreteValue3.Value = cd;
        paramField3.CurrentValues.Add(paramDiscreteValue3);
        paramFields.Add(paramField3);

        CrystalReportViewer1.ParameterFieldInfo = paramFields;
        reportDocument.Load(Server.MapPath("testreport.rpt"));
        //Load the report by setting the report source
        CrystalReportViewer1.ReportSource = reportDocument;
        CrystalReportViewer1.DisplayGroupTree = false;
        //set the database loggon information.


        reportDocument.SetDatabaseLogon("sa", "12345", @".SQLEXPRESS", "AnivetERP");
    }

Answer 1

    It maybe is because of the post back to make the report disappear. 
    You maybe can store the report into the session. and run it in the post back.
    if(Page.IsPostBack)
    {
    if(session['report'] != null)
{
                this.CrystalReportViewer1.ReportSource = session['report'] as CrystalDecisions.CrystalReports.Engine.ReportDocument;
                this.CrystalReportViewer1.DataBind();
}
    }
    Hope it can help you.