Class DataItem

Inheritance
System.Object
ReportObject
ReportItemBase
ReportItem
DataItem
Chart
Graph
LinearGauge
Map
RadialGauge
Table
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
Namespace: Telerik.Reporting
Assembly: Telerik.Reporting.dll

Syntax

public abstract class DataItem : ReportItem, IReportItem, IComponent, IDisposable, IToggleVisibilityTarget, IActionTarget, IDesignTimeStyleEditable, IDesignTimeSelectable, IDataItem, IDataFlow, IDataSourceContainer, INamedObject, ISupportsNeedDataSource

Constructors

DataItem()

Declaration
public DataItem()

Properties

DataSource

Gets or sets the data source that the DataItem (e.g., Table, Graph, Map) is displaying data for.

Declaration
public object DataSource { get; set; }
Property Value
System.Object

An object that functions as a data source.

Implements
Remarks

Telerik Reporting includes dedicated data source components that enable retrieving and feeding all data items from various sources. See all the available data source components at: https://docs.telerik.com/reporting/designing-reports/connecting-to-data/data-source-components/overview

For convenience, all the objects applicable to the DataSource property can be directly assigned to this DataSource property. At runtime, the report engine will wrap them in an ObjectDataSource to resolve the actual data.

Filters

Gets a FilterCollection that defines the filter expression(s) for the Table

Declaration
public FilterCollection Filters { get; }
Property Value
FilterCollection

FilterCollection that contains the Filter objects for the Table
Remarks

Filter expressions limit the data that is displayed to the user after the data is retrieved from the data source.

NoDataMessage

Gets or sets the current data item no data message.

Declaration
public string NoDataMessage { get; set; }
Property Value
System.String

A System.String that starts with "=" is interpreted as expression to calculate the no data message; otherwise - literal string. Supports embedded expressions also.

NoDataStyle

Gets a Style object specifying the appearance of the no data message.

Declaration
public Style NoDataStyle { get; }
Property Value
Style

A Style object specifying the items's style.

Sorting

Declaration
[Obsolete("Please use Sortings property instead.")]
public SortingCollection Sorting { get; }
Property Value
SortingCollection

Sortings

Gets a SortingCollection that defines the sort column(s), and their type and order for the Table

Declaration
public SortingCollection Sortings { get; }
Property Value
SortingCollection

A SortingCollection that contains the Sorting objects for the Table
Remarks

Sort expressions sort the data that is displayed to the user after the data is retrieved from the data source.

Methods

OnNeedDataSource(Object, EventArgs)

Declaration
protected virtual void OnNeedDataSource(object sender, EventArgs e)
Parameters
System.Object sender

System.EventArgs e

Events

NeedDataSource

Occurs when the processing of the data item processing instance (i.e., DataItem instance) begins and this instance has no DataSource property set.

Declaration
public event EventHandler NeedDataSource
Event Type
System.EventHandler

Remarks

The event is hooked on the definition DataItem instance, but the sender object in the event handler is the processing DataItem instance. The processing instance of the data item inherits its DataSource from the definition instance, but if neither has DataSource set, this event is raised.

Examples

The following example demonstrates how to implement a NeedDataSource event handler:

void table1_NeedDataSource(object sender, EventArgs e)
{
    Telerik.Reporting.Processing.DataItem processingDataItem = (Telerik.Reporting.Processing.DataItem)sender;
    Telerik.Reporting.Processing.Report processingReport = processingDataItem.Report;
    object processingParameterValue = processingReport.Parameters["parameter1"].Value;
    processingDataItem.DataSource = GetData(processingParameterValue);
}

static object GetData(object value)
{
    // Implement your custom data retrieval logic instead
    return new string[] { "Sofia", "London", "Tokyo" };
}

Private Sub table1_NeedDataSource(sender As Object, e As EventArgs)
    Dim processingDataItem As Telerik.Reporting.Processing.DataItem = DirectCast(sender, Telerik.Reporting.Processing.DataItem)
    Dim processingReport As Telerik.Reporting.Processing.Report = processingDataItem.Report
    Dim processingParameterValue As Object = processingReport.Parameters("parameter1").Value
    processingDataItem.DataSource = GetData(processingParameterValue)
End Sub

Private Shared Function GetData(value As Object) As Object
    ' Implement your custom data retrieval logic instead
    Return New String() {"Sofia", "London", "Tokyo"}
End Function

Explicit Interface Implementations

IDataFlow.Filters

Declaration
IList<Filter> IDataFlow.Filters { get; }
Returns
System.Collections.Generic.IList<Filter>

Implements

IDataFlow.Sortings

Declaration
IList<Sorting> IDataFlow.Sortings { get; }
Returns
System.Collections.Generic.IList<Sorting>

Implements