DataItem.UniqueId Property
Gets or sets the unique data item identifier.
Namespace: DevExpress.DashboardCommon
Assembly: DevExpress.Dashboard.v24.2.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
- The Categories query supplies values for the dashboard parameter
The dashboard items display data according to the selected values of the dashboard parameter.
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
The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.