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PivotGridControl.FilterPopupExcelParseFilterCriteria Event

Allows you to parse the filter criteria applied to data and select the corresponding values in the filter menu.

Namespace: DevExpress.XtraPivotGrid

Assembly: DevExpress.XtraPivotGrid.v20.1.dll

Declaration

[DXCategory("Behavior")]
public event FilterPopupExcelParseFilterCriteriaEventHandler FilterPopupExcelParseFilterCriteria
<DXCategory("Behavior")>
Public Event FilterPopupExcelParseFilterCriteria As FilterPopupExcelParseFilterCriteriaEventHandler

Event Data

The FilterPopupExcelParseFilterCriteria event's data class is FilterPopupExcelParseFilterCriteriaEventArgs. The following properties provide information specific to this event:

Property Description
Field Gets the processed field.
FilterCriteria Gets the applied filter criteria. Inherited from ParseFilterCriteriaEventArgs.
Path Gets the name of the processed data field or the full path to the data field through object relationships. Inherited from ParseFilterCriteriaEventArgs.
PivotGrid Gets the pivot grid that raised the event.
Value Gets an object that specifies the filter menu view model. Inherited from ParseFilterCriteriaEventArgs.

Remarks

The FilterPopupExcelQueryFilterCriteria event allows you to apply a custom filter criteria based on the values selected in a filter menu. This conversion is processed when the user selects a value in the menu/applies the selected values/closes the menu.

If you applied a custom filter criteria based on the selected data values, you should also handle the FilterPopupExcelParseFilterCriteria event to parse the filter criteria and select the corresponding values in the filter menu. This conversion is processed when the user opens the menu.

Examples

A default column filter menu contains data values available in the column. The code below shows how to populate a filter menu with custom values.

NOTE

The example uses the grid control. The vertical grid, tree list, and pivot grid controls provide a similar API.

In this example, the processed column contains comma-separated values that can be treated as individual tokens. The FilterPopupExcelData event allows you to populate the menu with custom tokens instead of the available data values.

readonly static char[] separators = new char[] { ',', ' ' };

void OnFilterPopupExcelData(object sender, FilterPopupExcelDataEventArgs e) {
    // Create a collection of tokens based on data values.
    var tokens = new HashSet<string>();
    for(int i = 0; i < e.Values.Length; i++) {
        var parts = ((string)e.Values[i]).Split(separators, StringSplitOptions.RemoveEmptyEntries);
        for(int j = 0; j < parts.Length; j++)
            tokens.Add(parts[j]);
    }
    // Remove the default data values from the filter menu.
    e.ClearData();
    // Populate the menu with the created tokens.
    foreach(string t in tokens.OrderBy(x => x))
        e.AddData(t, t);
}

If you have populated the menu with custom tokens, you also must handle the following events:

  • FilterPopupExcelQueryFilterCriteria — to convert the selected tokens to the corresponding filter criteria that should be applied to data (direct conversion). This conversion is processed when the user selects a token in the menu/applies the selected tokens/closes the menu.

    void OnFilterPopupExcelQueryFilterCriteria(object sender, FilterPopupExcelQueryFilterCriteriaEventArgs e) {
        var viewModel = e.Value as ICollectionValueViewModel<string>;
        var property = new OperandProperty(e.Path);
        var functions = viewModel.Values
            .Select(x => new FunctionOperator(FunctionOperatorType.Contains, property, x));
        e.FilterCriteria = CriteriaOperator.Or(functions);
    }
    
  • FilterPopupExcelParseFilterCriteria — to convert the applied filter criteria to the corresponding tokens that should be selected in the menu (reverse conversion). This conversion is processed when the user opens the menu.

    void OnFilterPopupExcelParseFilterCriteria(object sender, FilterPopupExcelParseFilterCriteriaEventArgs e) {
        var func = e.FilterCriteria as FunctionOperator;
        if(!ReferenceEquals(func, null))
            e.SetValue(((OperandValue)func.Operands[1]).Value);
        var group = e.FilterCriteria as GroupOperator;
        if(!ReferenceEquals(group, null)) {
            var values = group.Operands
                .OfType<FunctionOperator>()
                .Select(x => ((OperandValue)x.Operands[1]).Value);
            e.SetValues(values.ToArray());
        }
    }
    
See Also