C# 将参数传递给 Crystal 报告错误“缺少参数值”

我一直在将VB应用程序移植到C#。 除此报告外，所有水晶报告都有效。 我已经调试了，验证了参数名称，并遵循了我在此处找到的信息。 无论我尝试了什么，我都会收到错误"缺少参数值"。 当我尝试ExportToStream(ExportFormatType.PortableDocFormat)并另存为 PDF 时发生错误。 参数都是字符串。 当我调试时，6 个未链接的参数中的每一个都在rptParams.ContainsKey(def.name)块内命中。 有 7 个子报表只有链接的参数。

我在设置参数之前设置数据源。

我试过：

ParameterFieldDefinitions parmFields = rpt.DataDefinition.ParameterFields;
ParameterValues pvals = new ParameterValues();
foreach (ParameterFieldDefinition def in parmFields)
{
    if (!def.IsLinked() && rptParams.ContainsKey(def.Name))
    {
        ParameterDiscreteValue pval = new ParameterDiscreteValue();
        pval.Value = rptParams[def.Name];
        pvals.Add(pval);
        def.ApplyCurrentValues(pvals);
    }
}

这是基于原始的VB代码：

Dim paramFieldDefs As ParameterFieldDefinitions
Dim paramFieldDef As ParameterFieldDefinition
Dim paramVal As ParameterDiscreteValue
Dim paramVals As New ParameterValues
Dim colStepRepParams As Hashtable
colStepRepParams = cStep.ReportParams
' CREATE A NEW PARAMETERS COLLECTION
paramFieldDefs = rptReport.DataDefinition.ParameterFields()
For Each paramFieldDef In paramFieldDefs
    ' IF EXCLUDES 'PARAMETERS' WHICH LINK MAIN REPORT TO SUB REPORTS
    If Not paramFieldDef.IsLinked Then
        If colStepRepParams.ContainsKey(paramFieldDef.Name) Then
            paramVal = New CrystalDecisions.Shared.ParameterDiscreteValue
            paramVal.Value = colStepRepParams.Item(paramFieldDef.Name)
            paramVals.Add(paramVal)
            paramFieldDef.ApplyCurrentValues(paramVals)
        End If
    End If
Next paramFieldDef

我也试过：

foreach (ParameterFieldDefinition def in parmFields)
{
    if (!def.IsLinked() && rptParams.ContainsKey(def.Name))
    {
        rpt.SetParameterValue(def.Name, rptParams[def.Name]);
    }
}

事情的顺序如下：

using (SqlCommand cmd = new SqlCommand(job.sproc, con))
{
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.CommandTimeout = 600; //10 min
    foreach (KeyValuePair<string, string> p in sprParams)
    {
        cmd.Parameters.AddWithValue(p.Key, p.Value);
    }
    SqlDataAdapter da = new SqlDataAdapter(cmd);
    DataSet ds = new DataSet();
    da.Fill(ds);
    ReportDocument rpt = new ReportDocument();
    rpt.Load(Path.Combine(RPT_LOCATION, job.repFileName));
    rpt.Database.Tables[0].SetDataSource(ds.Tables[0]);
    int i = 1;
    foreach (string subReport in job.subReports)
    {
        using (ReportDocument srpt = rpt.OpenSubreport(subReport))
        {
            srpt.SetDataSource(ds.Tables[i++]);
        }
    }
    ParameterFieldDefinitions parmFields = rpt.DataDefinition.ParameterFields;
    ParameterValues pvals = new ParameterValues();
    foreach (ParameterFieldDefinition def in parmFields)
    {
        if (!def.IsLinked() && rptParams.ContainsKey(def.Name))
        {
            ParameterDiscreteValue pval = new ParameterDiscreteValue();
            pval.Value = rptParams[def.Name];
            pvals.Add(pval);
            def.ApplyCurrentValues(pvals);
        }
    }
}

///BEFORE setting DB connection 
ParameterFieldDefinitions parmFields = cr.DataDefinition.ParameterFields;
foreach (ParameterFieldDefinition def in parmFields)
{
   if (!def.IsLinked() )
     {
     switch (def.ValueType)
     {
           case CrystalDecisions.Shared.FieldValueType.StringField:
              cr.SetParameterValue(def.Name, "", def.ReportName);
              break;
           case CrystalDecisions.Shared.FieldValueType.NumberField:
              cr.SetParameterValue(def.Name, 0, def.ReportName);
              break;
           default:
              cr.SetParameterValue(def.Name, null, def.ReportName);
              break;
     }
    }
}
///Now set DB connections 
 ...
///Now set all parameters which INDEED HAVE to be set ...
 ...

foreach (ParameterFieldDefinition def in doc.DataDefinition.ParameterFields)
        {
            if (!def.IsLinked())
            {
                switch (def.ValueType)
                {
                    case CrystalDecisions.Shared.FieldValueType.StringField:
                        doc.SetParameterValue(def.Name, "");
                        break;
                    case CrystalDecisions.Shared.FieldValueType.NumberField:
                        doc.SetParameterValue(def.Name, 0);
                        break;
                    default:
                        doc.SetParameterValue(def.Name, null);
                        break;
                }
            }
        }
        doc.SetDataSource(table);
// Set parameters as I wanted from the beginning