DataFilter.Value Property

Gets or sets the filter value represented by the current data filter item.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v20.1.dll

Declaration

public virtual object Value { get; set; }
Public Overridable Property Value As Object

Property Value

Type Description
Object

A Object representing the value by which the series data is filtered.

Remarks

The Value property specifies the value by which series data should be filtered. Note that the Value property is tightly associated with the DataFilter.DataType property of a data filter object: the value assigned to the Value property should correspond to the data type set via the DataFilter.DataType property.

In addition to the value and its data type, a filter condition represented by a particular DataFilter object is defined by the DataFilter.Condition and DataFilter.ColumnName properties.

Examples

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});

Implements

DevExpress.Charts.Native.IDataFilter.Value
See Also