嵌入水晶报表页脚的子报表不显示数据答案

【问题标题】：Sub Report embedded in footer of Crystal report not showing data嵌入水晶报表页脚的子报表不显示数据
【发布时间】：2014-09-03 23:31:35
【问题描述】：

我有一个水晶报表，它的页脚中嵌入了一个子报表。这些报告单独工作正常，但是当我一起运行时，我没有在子报告中获得数据。我已验证数据存在于我的 2 个数据集中，并且我获得了主报告的数据，但没有获得子报告的数据。我错过了什么？（VS 2008 4.0 .NET 框架）

// check whether the dataset is manual; if so add the subreport queries
        if (AARpt.HasSubreports)
        {
            string srName;
            string sProc;
            using (AAData dc = new AAData(AAApp, true))
            {
                for (int i = 0; i < cRpt.ReportDefinition.ReportObjects.Count; i++)
                {
                    ReportObject CurrentObject = cRpt.ReportDefinition.ReportObjects[i];
                    if (CurrentObject.Kind == CrystalDecisions.Shared.ReportObjectKind.SubreportObject)
                    {
                        SubreportObject sr = (SubreportObject)CurrentObject;
                        rd = sr.OpenSubreport(sr.SubreportName );
                        srName = sr.SubreportName;

                        if (AARpt.SubReps.TryGetValue(srName, out sProc))
                        {
                            dsSubRept = dc.LoadSet(sProc);

                            if (dsSubRept != null)
                            {
                                DataTable dt1 = ds.Tables["MyTable"];
                                rd.SetDataSource(dt1);
                                rd.VerifyDatabase();

                            }
                            else
                            {
                                MessageBox.Show("We're sorry, but an error was encountered attempting to create this report","Utility", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                                return false;
                            }
                        }
                    }
                 }
            }
        }

    public DataSet LoadSet(SqlCommand _cmd)
    {
        // returns table "MyTable"
        SqlDataAdapter DA;
        DataSet DS = new DataSet();

        _cmd.CommandType = CommandType.StoredProcedure;
        _cmd.Connection = _Conn;

        DA = new SqlDataAdapter(_cmd);
        DA.Fill(DS, "MyTable");

        return DS;

    }

【问题讨论】：

标签： c# crystal-reports

【解决方案1】：

我为子报表使用了错误的数据集....否则它是完美的。下面更新了代码。

// check whether the dataset is manual; if so add the subreport queries
        if (AARpt.HasSubreports)
        {
            string srName;
            string sProc;
            using (AAData dc = new AAData(AAApp, true))
            {
                for (int i = 0; i < cRpt.ReportDefinition.ReportObjects.Count; i++)
                {
                    ReportObject CurrentObject = cRpt.ReportDefinition.ReportObjects[i];
                    if (CurrentObject.Kind == CrystalDecisions.Shared.ReportObjectKind.SubreportObject)
                    {
                        SubreportObject sr = (SubreportObject)CurrentObject;
                        rd = sr.OpenSubreport(sr.SubreportName );
                        srName = sr.SubreportName;

                        if (AARpt.SubReps.TryGetValue(srName, out sProc))
                        {
                            dsSubRept = dc.LoadSet(sProc);

                            if (dsSubRept != null)
                            {
                                // Following line added (not sure if needed, but was suggested in several spots)
                                rd.DataSourceConnections.Clear();
                                // The datasource in the following line changed - this was my real issue
                                DataTable dt1 = dsSubRept.Tables["MyTable"];
                                rd.SetDataSource(dt1);
                                rd.VerifyDatabase();

                            }
                            else
                            {
                                MessageBox.Show("We're sorry, but an error was encountered attempting to create this report","Utility", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
                                return false;
                            }
                        }
                    }
                 }
            }
        }
    // The following is part of a class for loading data, but it is straightforward otherwise
    // I just included so you know that it returns a DataSet with a table named "MyTable"
    public DataSet LoadSet(SqlCommand _cmd)
    {
        // returns table "MyTable"
        SqlDataAdapter DA;
        DataSet DS = new DataSet();

        _cmd.CommandType = CommandType.StoredProcedure;
        _cmd.Connection = _Conn;

        DA = new SqlDataAdapter(_cmd);
        DA.Fill(DS, "MyTable");

        return DS;

    }

【讨论】：