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WcfInstantFeedbackSource.GetSource Event

Occurs when the WcfInstantFeedbackSource needs a queryable source, to retrieve objects from the WCF data service.

Namespace: DevExpress.Data.WcfLinq

Assembly: DevExpress.Data.v18.2.dll

Declaration

public event EventHandler<GetSourceEventArgs> GetSource
Public Event GetSource As EventHandler(Of GetSourceEventArgs)

Event Data

The GetSource event's data class is GetSourceEventArgs. The following properties provide information specific to this event:

Property Description
AreSourceRowsThreadSafe Specifies whether elements retrieved by the WcfInstantFeedbackSource's queryable source are thread-safe.
Extender This property is intended for internal use.
KeyExpression Gets or sets the name of the key property.
Query Specifies the query request to the WCF data service.
Tag Gets or sets an arbitrary object associated with a queryable source.

Remarks

Handle this event, to supply a queryable source connected to the required WCF data service. The GetSourceEventArgs class exposes the GetSourceEventArgs.Tag property, which you can use to specify an arbitrary object. This object will be passed along with the GetSourceEventArgs.Query property to the WcfInstantFeedbackSource.DismissSource event handler.


public partial class Form1 : Form {
    private void Form1_Load(object sender, EventArgs e) {
        wcfInstantFeedbackSource1.KeyExpression = "CustomerID";
        wcfInstantFeedbackSource1.GetQueryable += wcfInstantFeedbackSource1_GetSource;
        gridControl1.DataSource = wcfInstantFeedbackSource1;
    }
    void wcfInstantFeedbackSource1_GetSource(object sender, GetSourceEventArgs e) {
        // DataServiceContext myDataServiceContext = ...
        e.Query = myDataServiceContext.Customers;
    }
}
See Also