DataItem.UniqueId Property
Gets or sets the unique data item identifier.
Namespace: DevExpress.DashboardCommon
Assembly: DevExpress.Dashboard.v21.2.Core.dll
Declaration
Property Value
| Type | Description |
|---|---|
| String | A String that specifies the data item identifier. |
Remarks
The UniqueId property returns null for the newly created data item. If you add the created DataItem to a data-bound dashboard item (DataDashboardItem), the UniqueId will return an auto-generated identifier (DataIem0, DataItem1, etc.), which is unique inside a dashboard item.
You can use the value returned by the UniqueId property to identify the data item in the following cases:
- to refer to the specified data item in filter criteria, pass its identifier to the DataDashboardItem.FilterString property;
- to refer to the specified data item in the Expression format condition, pass its identifier to the FormatConditionExpression.Expression property.
Important
If you specified a custom data item identifier, make sure that its value is unique inside a dashboard item. Otherwise, DuplicateDataItemIdException will be thrown.
Example
The following example demonstrates how to create a new dashboard parameter and pass it to a dashboard item filter string.
In this example, the dashboard data source contains two queries - the SalesPerson query is used for data visualization while the Categories query provides values for the dashboard parameter.
After the dashboard parameter is created, it is passed to a dashboard item’s filter strings. So, the dashboard displays data according to the selected values.
using DevExpress.XtraEditors;
using DevExpress.DashboardCommon;
namespace Dashboard_Parameters {
public partial class Form1 : XtraForm {
public Form1() {
InitializeComponent();
Dashboard dashboard = new Dashboard();
dashboard.LoadFromXml(@"..\..\Data\Dashboard.xml");
// Obtain dashboard items and specify identifiers for data items.
GridDashboardItem grid = (GridDashboardItem)dashboard.Items[0];
PieDashboardItem pie = (PieDashboardItem)dashboard.Items[1];
((GridDimensionColumn)grid.Columns[0]).Dimension.UniqueId = "categoryColumn";
pie.SeriesDimensions[0].UniqueId = "categorySeries";
// Obtain the dashboard data source used to provide parameter values.
DashboardSqlDataSource parameterDataSource =
(DashboardSqlDataSource)dashboard.DataSources[0];
// Create a new parameter that obtains its values from the Categories query.
DynamicListLookUpSettings settings = new DynamicListLookUpSettings();
settings.DataSource = parameterDataSource;
settings.DataMember = "Categories";
settings.ValueMember = "CategoryName";
DashboardParameter parameter = new DashboardParameter("categoryParameter",
typeof(string), "Beverages", "Select categories:", true, settings);
// Enable multi-selection for the created parameter.
parameter.AllowMultiselect = true;
// Add the created parameter to a collection of dashboard parameters.
dashboard.Parameters.Add(parameter);
// Include the created parameter in filter strings as an operand value.
grid.FilterString = "categoryColumn in (?categoryParameter)";
pie.FilterString = "categorySeries in (?categoryParameter)";
dashboardViewer1.Dashboard = dashboard;
}
}
}
Related GitHub Examples
The following code snippets (auto-collected from DevExpress Examples) contain references to the UniqueId property.
Note
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