Use the Level() function to create recursive hierarchy reports. in C#.NET

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Use the Level() function to create recursive hierarchy reports.
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The trick to creating a recursive hierarchy report with RS is to configure the Parent Group setting on the region Grouping and Sorting Properties dialog, as shown in figure 5.15. In our case, we set the Parent Group to the employee s manager. Once this is done, RS walks recursively through the employee data, starting with the top manager and going all the way down. To offset the table region rows in accordance with the employee hierarchical level, we used the following expression for the left padding setting of the Employee Name textbox (txtName):
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=Convert.ToString(2 + (Level()*10)) & "pt", 2pt, 2pt, 2pt
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The Level function returns an integer value indicating the hierarchical level of a row. Thus, for the top manager, Level returns 0; its subordinates have a level of 1, and so on. We simply use the return value from the Level function to offset the text accordingly. To give the user an option to switch between employees and managers, we added the Filter parameter with two available values, Employee and Manager, respectively. Then, we based the report dataset query on an expression that appends the appropriate WHERE clause accordingly.
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Figure 5.15 Use the Parent Group setting to establish the parent-child relationship.
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USING EXPRESSIONS AND FUNCTIONS
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Using the Previous function to implement the percentage increase
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Implementing data differentials The Previous() function is useful to return the previous aggregate value from the current or another scope. For example, we can enhance the Monthly Sales by Product Category and add a % Change column to show the change in percentage from one month to the next. Figure 5.16 shows the new version of the report. Looking at the report, the user can see that, for example, the sales were up 71 percent from July to August. We used to the following expression for the value of the txtPerChange textbox:
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=Iif(Previous(Fields!Sales.Value)>0, _ (Fields!Sales.Value - Previous(Fields!Sales.Value)) _ /Previous(Fields!Sales.Value), "N/A")
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First, this expression checks to see whether we have data from the previous month. If not, N/A is displayed. Otherwise, we use the Previous function to get the sales amount for the previous month and calculate the difference. Now that we know how to use expressions and functions, we can make our reports more interactive by taking advantage of the navigational features that RS provides.
DESIGNING REPORTS
WITH NAVIGATIONAL FEATURES
With Reporting Services you can add navigational features to your reports in the form of hyperlinks and document maps. By using these features, you can give the report user the option to jump quickly to a specific area of a large report or navigate to an external URL-addressable resource.
DESIGNING REPORTS WITH NAVIGATIONAL FEATURES
Reports with hyperlinks All data regions (including the chart region) support hyperlinks. Hyperlinks in reports can be used to allow the user to navigate to Another report A bookmark inside a report, similarly to the way you can use bookmarks in Microsoft Word documents A URL address The currently supported options are mailto, http, https, news, and ftp. The URL address can be defined as static text or produced by an expression. For example, in a report that shows a list of vendors, the vendor name hyperlink could navigate the user to the vendor s web site.
NOTE
Unfortunately, to prevent executing client-side malicious code, Reporting Services currently doesn t support calling JavaScript functions from hyperlinks. Microsoft hints that a future version may allow the administrator to configure RS to allow additional protocols.
One common use of hyperlinks is to navigate the user to a URL address. Using hyperlinks to send e-mail The Territory Sales Drillthrough report (shown in figure 5.17) demonstrates how you can incorporate navigation capabilities in your reports with hyperlinks. Now the report displays the salesperson s name as a hyperlink, so the user can conveniently click it to send the salesperson an e-mail message. You can define hyperlinks for textbox and image report items from the Navigation tab of the item s Advanced Properties dialog, as shown in figure 5.18. In this case, we defined the following expression for the Jump to URL hyperlink action property:
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