Using the Level Function in .NET

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Using the Level Function
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The Level function is used with recursive hierarchies to identify the relationship of the current row to the top of the hierarchy. The syntax of this function is Level(Scope) where Scope is the name of a grouping, data region, or dataset. If you omit Scope, the current scope of the expression is used. The function returns an integer value that starts at 0 for the top of the hierarchy and increments by 1 for each subsequent level. The most common use of this function is to change style properties for different levels of a hierarchy.
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Click =Fields!ParentEmployeeKey.Value from the Parent group so that the Details Grouping dialog box now looks like this:
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In this procedure, you will use the Level function to display the current level of the hierarchy and to format cells by level.
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Use the Level function in an expression
Click the Layout tab, right-click the Level cell in the detail row, and then click Expression. Type the following expression:
=Level("RecursiveGroup")
The scope of the function is RecursiveGroup, which is the employee grouping you created in the previous procedure. Click the OK button. Save, and then preview the report, which should now look like this:
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Now you can see the employee groupings more easily, but formatting would make the groups stand out even better. Click the Layout tab, and then click the first cell in the detail row. In the Properties window, expand the Padding category, and then click <Expression in the Left property list box. > Replace the default expression with the following:
=2 + (Level("RecursiveGroup") * 20) & "pt"
This expression increases the padding used to indent the detail row as the level number increases. 8 Click the OK button. 9 Click the detail row handle in the table. 10 In the Properties window, expand the Font property, and then click <Expression in the FontWeight property list box. > 11 Replace the default expression with the following:
=IIf(Level ("RecursiveGroup")=0, "Bold", "Normal")
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Using the Recursive Keyword
The Recursive keyword acts as a modifier to any aggregate function with the purpose of returning a value that includes not only the detail rows, but also the value of the parent row in a group. The keyword must be placed after the Scope argument in an aggregate function. In this procedure, you will use the Recursive keyword with the aggregate functions Count and Sum.
Use Recursive aggregate functions
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=Count(Fields!EmployeeKey.Value,"RecursiveGroup",Recursive)
Click the OK button. Right-click the Total Salary cell in the detail row, and then click Expression. Modify the expression so that it looks like this:
=Sum(Fields!Salary.Value,"RecursiveGroup",Recursive)
This expression calculates the total salaries for the employees in levels below the current row and includes the salary for the current row.
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Click the Layout tab, right-click the Employee Count cell in the detail row, and then click Expression. Enter the following expression:
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This expression uses boldface text when rendering the highest level employees in the report. 12 Click the OK button. 13 Save, and then preview the report, which should now look like this:
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Right-click the Salary of Reports cell in the detail row, and then click Expression. Change the expression so that it looks like this:
=Sum(Fields!Salary.Value,"RecursiveGroup",Recursive)Sum(Fields!Salary.Value)
This expression subtracts the salary of the current employee from the recursive aggregation so that only the value of the employees underneath the current employee is returned. Click the OK button. Save, and then preview the report using a zoom factor of 75 percent to confirm that the top of the report now looks like this:
Compare the difference in the results of the Total Salary column and the Salary of Reports column. If you want a parent row s value aggregated with the lower levels, simply use an aggregation with the Recursive keyword to get a result like the Total Salary column. If you don t want the parent row s value included, you ll need to subtract out the current row to get results as shown in the Salary of Reports column.
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