FlexPivot for WPF | ComponentOne
Data Blending / Filtering / Top N Filter
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    Top N Filter
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    FlexPivot allows you to sort and filter the pivot data to show the top N records. This is useful to filter out smaller sections of the data and add clarity to the analysis. The Top N Filter is the best option when you want to filter elements that have the highest values from a random list and the Bottom N Filter is great when it comes to filter elements with the lowest values. For example, you can use the Top N or Bottom N filtering is to display the top-selling or bottom-selling products for analyzing the sales performance.

    Top N Filtering with Code

    In FlexPivot, you can apply Top N Filters programmatically using the C1FlexPivotFilter class, which provides the TopNValueField property to select a value field, the TopNRule enumeration to choose between the top N or bottom N elements, and the TopN or BottomN properties to assign the number of elements to be filtered.

    Copy Code
    //Apply Top N Filter to show top 3 selling products in every country
    C1.FlexPivot.C1FlexPivotFilter topNfilter = fpEngine.Fields["Salesperson"].Filter;
    topNfilter.TopNValueField = fpEngine.Fields["ExtendedPrice"];
    topNfilter.TopNRule = C1.FlexPivot.TopNRule.TopN;
    topNfilter.TopN = 2;

    Top N Filtering at Runtime

    To display top N filtering at runtime:

    1. Right click a field name. Click the Field Settings option to open the Field Settings dialog. This invokes the Field Settings dialog.
    2. Select the Top N option in the filter dropdown menu.
    3. In the TopN dialog, you can choose between TopN or BottomN and assign the number of elements to be filtered. You can also assign a value field in the by value option.