Building Custom Reporting Tools in .NET

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16 Building Custom Reporting Tools
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Building Custom Reporting Tools CD-517
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As mentioned earlier in this chapter, this code is intended to illustrate two different approaches to rendering a report. You can use the URL access method and capture the rendered report as an HttpWebResponse object that you can read into a byte array. Alternatively, you can use the Render() method included in the Reporting Services Web service and capture the rendered report as a byte array. Once you have data in the byte array, you can choose to display it or store it in the file system. 19 Copy the contents of the GetParameterSelectedValueVB.text in the C:\rs2000sbs\chap16 folder below the Button1_Click() method to add the following code:
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Private Function GetParameterSelectedValue(ByVal CurrentListBox As ListBox, ByVal ParameterName As String) As ParameterValue Dim parameter As New ParameterValue parameter.Name = ParameterName parameter.Value = CurrentListBox.SelectedValue Return parameter End Function
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20 Save the file, and then press F5 to test. 21 Select the parameter values as shown in the table below, and then
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click the View Report button.
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Parameter Year
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Value 2002
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Feb Bike
Your screen looks like this:
Building Custom Reporting Tools
response = myReportService.Render(myReport, Format, HistoryID, DeviceInfo, myParameters, _ Credentials, ShowHideToggle, Encoding, MimeType, UsedParameters, Warnings, StreamIDs) Label1.Text = " Label1.Text += encode.GetString(response, 0, response.Length) Catch ex As Exception Label1.Text = Error retrieving page" End Try End If
CD-518 Part 5
Programming Reporting Services
16 Building Custom Reporting Tools
G16PS18.eps
This version of the report is rendered using the URL method. Notice that the URL of the page remains constant. Unlike using the URL method directly in a browser where users can see and change parameter values, you can hide the URL used to access the report and set parameter values by using a Web application to display the page. 22 Select the parameter values as shown in the table below, select Web Service, and then click the View Report button.
Parameter Year
Month Category
Value 2004
Jan Clothing
Your screen looks like this:
16
Building Custom Reporting Tools CD-519
G16PS19.eps
This version of the report is rendered using the Render() method of the Web service. The difference between the two methods used to render the report is transparent to the user. Although using the URL method generally performs better than using the Web service, in this application the difference is negligible because a Reporting Service object has to be instantiated to retrieve the parameter values for display in the ListBox controls. As you learned earlier in this chapter, you can pass the URL to an HttpWebResponse object without instantiating a Reporting Service object when you don t need to access information about the report before displaying it.
Tip You can use security creatively if you want to control access to reports within Report Manager. You can block users from viewing the folder that contains the report in your application so that users can neither see nor open that folder in Report Manager. However, you can grant permission to the report within that folder so that it can be accessed directly by an application. (It can also be accessed directly by URL). This technique is useful when you have reports that you display in a controlled interface, such as the parameter interface implemented here. 23 Close the browser window.
Building Custom Reporting Tools
CD-520 Part 5
Programming Reporting Services
Enabling Multi-Select for Parameters
The list box that displays in the HTML Viewer toolbar when a parameter has a list of available values allows you to select only a single value at a time. If you want to use multiple values for a parameter, you have to design your parameter without available values and allow the user to enter values as string using a specified delimiter (such as a comma) to separate values. Then you can add a user-defined function to parse the string into values that can be used with the IN operator in the SELECT statement for the dataset. However, this technique requires the user to know valid values for the parameter, which might not always be the case. As an alternative approach for handling parameters with multiple values, you can design a Web application that uses the multiple selection mode of a ListBox control and then transform the selected values into a string that can be used with the IN operator in the dataset query. This approach requires you to modify the report by adding a new parameter to contain the string of values selected by the user and by altering the dataset query to use the new parameter. In this procedure, you will modify both the report and the Web application to accept multiple values for the Category parameter.
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