将参数从 C# 传递到 Crystal Reports

Question

我在将参数从 C# 表单传递到我的报告时遇到问题。 我在 sql server 数据库 MoM 中有 3 个存储过程，它们需要 @MoM_ID。 起初，当我设置我的报告时，我将这些程序添加到其中并给它们值 339 (@MoM_ID = 339)。仅有的两个选项是添加该值或将其设置为 NULL 以继续。

设置报告后，我将以下代码添加到我的 C# 表单中，该代码在单击按钮时发生。代码应将参数传递给存储过程，并将报告输出为 pdf 文件，其中包含报告中的新值。但是，当我这样做时，我总是在报告中得到相同的默认值，其中@MoM_ID 等于 339。

这是代码：

ReportDocument reportDocument = new ReportDocument();
ParameterField paramField = new ParameterField();
ParameterFields paramFields = new ParameterFields();
ParameterDiscreteValue paramDiscreteValue = new ParameterDiscreteValue();

//Set instances for input parameter 1 -  @Dept
paramField.Name = "@MoM_ID(Action_Items)";
            //*Remember to reconstruct the paramDiscreteValue and paramField objects
paramDiscreteValue.Value = "337";
paramField.CurrentValues.Add(paramDiscreteValue);
//Add the paramField to paramFields
paramFields.Add(paramField);
crystalReportViewer1.ParameterFieldInfo = paramFields;

reportDocument.Load(@"C:\Users\nbousaba\Documents\Visual Studio 2013\Projects\WindowsFormsApplication4\WindowsFormsApplication4\Report1.rpt");
//Load the report by setting the report source
crystalReportViewer1.ReportSource = reportDocument;
crystalReportViewer1.Refresh();

//set the database loggon information. 
reportDocument.SetDatabaseLogon("//USERNAME", "//PW", "//IP", "MoM");

//Creating a PDF file from the Crystal Report
try
{
    ExportOptions CrExportOptions ;
    DiskFileDestinationOptions CrDiskFileDestinationOptions = new DiskFileDestinationOptions();
    PdfRtfWordFormatOptions CrFormatTypeOptions = new PdfRtfWordFormatOptions();
    CrDiskFileDestinationOptions.DiskFileName = "c:\\testing123.pdf";
    CrExportOptions = reportDocument.ExportOptions;
    {
        CrExportOptions.ExportDestinationType = ExportDestinationType.DiskFile;
        CrExportOptions.ExportFormatType = ExportFormatType.PortableDocFormat;
        CrExportOptions.DestinationOptions = CrDiskFileDestinationOptions;
        CrExportOptions.FormatOptions = CrFormatTypeOptions;
    }
    reportDocument.Export();
}
catch (Exception ex)
{
    MessageBox.Show(ex.ToString());
}

谢谢

Answer 1

问题通过以下代码解决，不要忘记将子报表链接到主报表以更新参数。

    ReportDocument cryRpt = new ReportDocument();

    TableLogOnInfos crtableLogoninfos = new TableLogOnInfos();
    TableLogOnInfo crtableLogoninfo = new TableLogOnInfo();
    ConnectionInfo crConnectionInfo = new ConnectionInfo();
    Tables CrTables;

    string path = "C:/Users/nbousaba/Documents/Visual Studio 2013/Projects/WindowsFormsApplication4/WindowsFormsApplication4/Report1.rpt";
    cryRpt.Load(path);

    cryRpt.SetParameterValue("@MoM_ID", x);

    crConnectionInfo.ServerName = ".";
    crConnectionInfo.DatabaseName = "MoM";
    crConnectionInfo.UserID = "sa";
    crConnectionInfo.Password = "123456";

    CrTables = cryRpt.Database.Tables;
    foreach (CrystalDecisions.CrystalReports.Engine.Table CrTable in CrTables)
    {
        crtableLogoninfo = CrTable.LogOnInfo;
        crtableLogoninfo.ConnectionInfo = crConnectionInfo;
        CrTable.ApplyLogOnInfo(crtableLogoninfo);
    }

    crystalReportViewer1.ReportSource = cryRpt;
    crystalReportViewer1.Refresh();


    //Creating a PDF file from Crystal Report
    try
    {
        ExportOptions CrExportOptions;
        DiskFileDestinationOptions CrDiskFileDestinationOptions = new DiskFileDestinationOptions();
        PdfRtfWordFormatOptions CrFormatTypeOptions = new PdfRtfWordFormatOptions();
        CrDiskFileDestinationOptions.DiskFileName = "c:\\MoM_Form"+x+".pdf";
        CrExportOptions = cryRpt.ExportOptions;
        {
            CrExportOptions.ExportDestinationType = ExportDestinationType.DiskFile;
            CrExportOptions.ExportFormatType = ExportFormatType.PortableDocFormat;
            CrExportOptions.DestinationOptions = CrDiskFileDestinationOptions;
            CrExportOptions.FormatOptions = CrFormatTypeOptions;
        }

        cryRpt.Export();