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As usual, add the following code behind Default.aspx.cs: using using using using using using using using using using using using System; System.Data; System.Configuration; System.Collections; System.Web; System.Web.Security; System.Web.UI; System.Web.UI.WebControls; System.Web.UI.WebControls.WebParts; System.Web.UI.HtmlControls; System.Data.SqlClient; Microsoft.Reporting.WebForms;
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public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { // Add a handler for drill-through report ReportViewer1.Drillthrough += new DrillthroughEventHandler(ReportViewer1_Drillthrough); } protected void Button1_Click(object sender, EventArgs e) { // connection string string cnString = @"Data Source=(local);Initial Catalog= RealWorld;Integrated Security=SSPI;"; SqlConnection conReport = new SqlConnection(cnString); SqlCommand cmdReport = new SqlCommand(); SqlDataReader drReport; DataSet dsReport = new dsProductInventory();
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try { // open connection conReport.Open(); cmdReport.CommandType = CommandType.Text; cmdReport.Connection = conReport; // get query string from string builder cmdReport.CommandText = "SELECT * FROM ProductDrilldown ORDER BY ProductNumber; SELECT * FROM InventoryStatus ORDER BY ProductNumber"; // execute query and load result to dataset drReport = cmdReport.ExecuteReader(); dsReport.Load(drReport, LoadOption.OverwriteChanges, dsReport.Tables[1], dsReport.Tables[0]); // close connection drReport.Close(); conReport.Close(); Session["dsProductInventory"] = (DataSet)dsReport; // prepare report for view ReportViewer1.LocalReport.ReportPath = "rptProductInformation.rdlc"; //pass user choice of hiding price list column to //report using the report parameters ReportParameter parHidePriceList = new ReportParameter("parHidePriceList", CheckBox1.Checked "Y" : "N"); ReportViewer1.LocalReport.SetParameters(new ReportParameter[] { parHidePriceList }); ReportDataSource rds = new ReportDataSource(); rds.Name = "dsProductInventory_dtProductInformation"; rds.Value = dsReport.Tables[1]; ReportViewer1.LocalReport.DataSources.Add(rds); } catch (Exception ex) { Response.Write(ex.Message); }
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finally { if (conReport.State == ConnectionState.Open) { conReport.Close(); } } } void ReportViewer1_Drillthrough(object sender, Microsoft.Reporting.WebForms.DrillthroughEventArgs e) { DataSet ds = new DataSet(); ds = (DataSet)Session["dsProductInventory"]; LocalReport InventoryReport = (LocalReport)e.Report; InventoryReport.DataSources.Add(new ReportDataSource ("dsProductInventory_dtInventoryStatus", ds.Tables[0])); } } This code has a few extra special instructions compared with previous examples. First, you ll see that there are page-load and button-click events. In the page-load event, I m taking care of the drill-through event handler; I need to handle this event while the page loads, because when the user clicks the product number a postback happens. Due to this postback event, we need to handle the drill-through event again. With the button-click event, I m doing the bulk of the job. Since we have two tables to fill in this example, I sent two separate SQL SELECT statements to the database: cmdReport.CommandText = "SELECT * FROM ProductDrilldown ORDER BY ProductNumber; SELECT * FROM InventoryStatus ORDER BY ProductNumber"; Next, I load the data from the data reader to the dataset by calling the Load method like this: dsReport.Load(drReport, LoadOption.OverwriteChanges, dsReport.Tables[1], dsReport.Tables[0]); If you notice, I m calling the Load method by passing some extra parameters; the first parameter sets the overwrite condition and the second passes in each table reference to fill from the dataset. You might be wondering how our drill-through report manages to get the data; for that, we have to create a handler, which looks like the following: ReportViewer1.Drillthrough += new DrillthroughEventHandler(ReportViewer1_Drillthrough); With the preceding lines added to code, we add an event handler to the Drillthrough event of the parent report. Next, we add another method, ReportViewer1_Drillthrough, that responds to this event. The code behind our method takes care of getting the data for our child report. The code inside our method looks like this:
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DataSet ds = new DataSet(); ds = (DataSet)Session["dsProductInventory"]; LocalReport InventoryReport = (LocalReport)e.Report; InventoryReport.DataSources.Add(new ReportDataSource ("dsProductInventory_dtInventoryStatus", ds.Tables[0])); You ll also notice that I m making use of a session to hold the dataset content intact for both the parent and drill-through reports. All right, it s time to see the magic of the drillthrough report in action let s move on to building the project.
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Building the Project
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Again, build the project by clicking the small, green play button in the main toolbox or pressing F5. If the program compiles without any errors, you will see the form with the report in preview mode. Please make sure the report looks similar to the ones shown in Figures 5-32 and 5-33 (this report varies depending on what product number you click in the parent report). Recall that we built functionality to let the user decide if the price list should be displayed or not. Let s try this function and see how the report output looks. If you click the Hide List Price check box and click the button to generate the report, your report output should look similar to Figure 5-47. See how the entire price list column is hidden in the report output This kind of dynamic control provides powerful interaction of the GUI and report rendering engine.
Figure 5-47. Report output with the Hide Price List option selected Recall in the first chapter that I showed you a real-world example of a Trial Balance report in Arabic Well, let me show you now how you can create a report that is not in the English language. Further, you ll see how to handle a language that is written from right to left.
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