如何在C＃Win Form应用程序中设置Sub Crystal报表的数据源

Question

I am using this code to load a main report and a subreport inside the main report. The main report is a blank one and just contains subreport.

Here is my code:

MySqlConnection cnn;
string connectionString = null;
string sql = null;

connectionString = "Server = BC; Database = mydb1; Uid = root; Pwd = abc123;";
cnn = new MySqlConnection(connectionString);
cnn.Open();

sql = "SELECT * from mytable1 ";
MySqlDataAdapter dscmd = new MySqlDataAdapter(sql, cnn);
DataSet1 ds = new DataSet1();
dscmd.Fill(ds, "Imagetest");
cnn.Close();

ReportDocument cryRpt = new ReportDocument();
cryRpt.Load("C:/Subreport.rpt");
cryRpt.SetDataSource(ds.Tables[1]);

crystalReportViewer1.ReportSource = "C:/MainReport.rpt";
crystalReportViewer1.Refresh();

When I run the application I just see main report with blank subreport.

Answer 1

ReportDocument cryRpt = new ReportDocument();
cryRpt.Load("C:/MainReport.rpt");
cryRpt.DataSourceConnections.Clear();
cryRpt.SetDataSource(ds.Tables[0]);
cryRpt.Subreports[0].DataSourceConnections.Clear();
cryRpt.Subreports[0].SetDataSource(ds.Tables[0]);
crystalReportViewer1.ReportSource = cryRpt;
crystalReportViewer1.Refresh();

Answer 2

Simply do this:

...
DataSet ds = new DataSet();
dscmd.Fill(ds, "DataTable1");
...

ReportDocument cryRpt = new ReportDocument();
cryRpt.Load("C:/MainReport.rpt");
cryRpt.SetDataSource(ds);

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

Note I'm creating a new DataSet and not a type derived from the DataSet.

In the report/subreport database fields menu, the table must have the same name as the DataTable:

And the Datasource location for reports and subreports must be the same:

This will bind the source tables by name with the .rpt file. Doing in this way you no longer need to set the data for each subreport by code.