DataFilter.ColumnName Property
Gets or sets the name of the data field which the filter condition is applied to.
Namespace: DevExpress.XtraCharts
Assembly: DevExpress.XtraCharts.v24.2.dll
Declaration
Property Value
| Type | Description |
|---|---|
| String | A String value that specifies the name of the corresponding data field. |
Remarks
Use the ColumnName property to specify the data field whose values are taken in account when applying the filter condition defined by the current filter item. The ColumnName property specifies the name of the required data field from the data source which the corresponding series is bound to. Note that the series should be bound to the specified field (either via its SeriesBase.ArgumentDataMember or SeriesBase.ValueDataMembers property) in order for the applied filtering to take effect.
Example
The following example demonstrates how to create DataFilter objects, and apply their conditions to a series at runtime. For more information, refer to Filtering Data.
For this example to work correctly, a chart should contain at least one series, which is bound to the “Categories” data table in the Northwind Traders database (nwind.mdb file shipped with the XtraCharts demo). Please refer to the following tutorial to see how to bind a series to data: How to: Bind Individual Chart Series to Data (Runtime Sample).
The code below creates and applies the following filter to series data: “CategoryID = 1 or CategoryID = 4 or CategoryID = 7”
using DevExpress.XtraCharts;
// ...
// Create new data filters and specify conditions for them.
DataFilter dataFilter1 = new DataFilter("CategoryID", "System.Int32", DataFilterCondition.Equal, 1);
DataFilter dataFilter2 = new DataFilter("CategoryID", "System.Int32", DataFilterCondition.Equal, 4);
DataFilter dataFilter3 = new DataFilter("CategoryID", "System.Int32", DataFilterCondition.Equal, 7);
// Obtain the first series of the chart.
Series series1 = chartControl1.Series[0];
// Set the logical operator used to combine individual data filter conditions for this series.
series1.DataFiltersConjunctionMode = ConjunctionTypes.Or;
// Remove all other filters.
series1.DataFilters.Clear();
// Add new filters to apply to the series data.
series1.DataFilters.AddRange(new DataFilter[] {dataFilter1, dataFilter2, dataFilter3});