Passing Parameters

[Maher]

I am working on an ASPX page where the user enters some information. When the user click the save button I want to save the entered data then call Telerik’s report passing to it the record_id of the new saved data. I cannot find any information on how to pass parameter to a report. Could someone help me on this issue?

 

Thanks

Maher

[Maher]

Here what I AM doing

in the ASPX page I have the following code in the onclick button event witch shows the report in reportviewer

 protected void Button1_Click(object sender, EventArgs e)
        {
            DocumentFax.Report1 report = new DocumentFax.Report1();           
            report.ReportParameters.Add("id", Telerik.Reporting.ReportParameterType.String, "1");
            ReportViewer1.Report = report;
        }
The DLL for report is called DocumentFax.DLL. the code I have in the Report1.cs is

public Report1()
        {
            /// <summary>
            /// Required for telerik Reporting designer support
            /// </summary>
            InitializeComponent();
            string strID = this.ReportParameters["id"].Value.ToString();
            more code here
        }

when I click on the button to view the report I get the error shown below

Object reference not set to an instance of an object.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

Line 19: /// </summary> Line 20: InitializeComponent(); Line 21: string strID = this.ReportParameters["id"].Value.ToString();

Could someone explain to me how to initialize the parameter so I do not get this error?

Thanks
Maher

[Steve]

Hi Maher,

You should have an existing report parameter in your report, which you can access through your aspx page and pass a value to in the following manner:

this.ReportViewer1.Report.ReportParameters["MyParam"].Value = <your_value>;

Sincerely yours,
Steve
the Telerik team

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[K N]

I used the following code:
reportViewer1.Report.ReportParameters["StudentID"].Value = ID;

but got this error:
Error   1   Cannot apply indexing with [] to an expression of type 'System.Collections.Generic.IEnumerable<Telerik.Reporting.ReportParameter>'

[Steve]

Hi K N,

It depends on what Telerik Reporting version you're using. From Q1 2009 we've made some changes to the ReportViewer.Report property (more info in ReportViewer.Report property is now of type Telerik.Reporting.IReportDocument). You can try the following code instead:

Telerik.Reporting.Report report = (Telerik.Reporting.Report)this.ReportViewer1.Report;
report.ReportParameters["StudentID"].Value = ID;

or directly instantiate the report like so:

MyReport myReport = new MyReport();  
myReport.ReportParameters["StudentID"].Value = ID;
 
this.ReportViewer1.Report = myReport;

Kind regards,
Steve
the Telerik team

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[Divya]

I am working on an ASPX page where the user select some information.
When the user click the submit button I want to show the entered data related information then
call Telerik’s report. I cannot find any information on how to pass parameter to a
report.report header is visible but datafield not showing
 Could someone help me on this issue?

[Stef]

Hi Divya,

This is  a quote from my post in your support ticket #806737  on the same question:

"This can be achieved through the Report Source object that wraps the report. The ReportSource.Parameters collection (key-value pairs) is mapped to the underlying Report.ReportParameters collection by key. Using this approach you can pass also Session variable, as long as they are from the supported by the report parameters types: String, Integer, Float, Datetime, Boolean. You can also reassign the ReportViewer.ReportSource to other Report Source object."

In the ticket you can find more links to our documentation and a demo project. If you need any further help, please use our support ticketing system and address your issue in a single thread to avoid splitting information. The thread can be found after logging into your account and checking Your Support tickets.

Thank you for your understanding.

Regards,
Stef
Telerik