XpoDefault.DataLayer Property

Gets or sets the default data access layer which is used by Session objects by default, to access a data store.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v19.2.dll

Declaration

C#

public static IDataLayer DataLayer { get; set; }

VB.NET

Public Shared Property DataLayer As IDataLayer

Property Value

Type	Description
IDataLayer	An object which implements the IDataLayer interface; null - in this case, every new session will create and use its own data layer.

Example

This example demonstrates how to create a data layer that will be used by all Session objects.

The XpoDefault.DataLayer property’s value is null by default. XPO creates a new data layer for each session when the session is connected to a data store.

In this example, a data layer (represented by the SimpleDataLayer class object) is created and assigned to the XpoDefault.DataLayer property using the XpoDefault.GetDataLayer method.

In this case, newly created sessions will use this data layer. The sessions’ Session.Connection and Session.ConnectionString properties are not initialized.

C#

using DevExpress.Data.DB;
using DevExpress.Xpo;

string forcedConnectionString = ...;
XpoDefault.DataLayer = XpoDefault.GetDataLayer(forcedConnectionString, 
    AutoCreateOption.DatabaseAndSchema);

VB.NET

Imports DevExpress.Data.DB
Imports DevExpress.Xpo

Dim forcedConnectionString As String = ...
XpoDefault.DataLayer = XpoDefault.GetDataLayer(forcedConnectionString, _
    AutoCreateOption.DatabaseAndSchema)

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the DataLayer 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.

C#

XPO_how-to-make-user-friendly-object-identifiers-e825/CS/Program.cs#L17

static void Main(string[] args) {
    XpoDefault.DataLayer = XpoDefault.GetDataLayer(AutoCreateOption.DatabaseAndSchema);
    Do("A");

XAF_how-to-create-a-recurring-appointment-via-code-e1283/CS/Program.cs#L17

IDataStore store = XpoDefault.GetConnectionProvider(connectionString, AutoCreateOption.DatabaseAndSchema);
XpoDefault.DataLayer = new SimpleDataLayer(dict, store);
XpoDefault.Session = null;

Create-a-Report-Bound-To-XPObjectSource/CS/Create a Report Bound to XPObjectSource/ORMDataModel1Code/ConnectionHelper.cs#L33

    dictionary.GetDataStoreSchema(persistentTypes);
    XpoDefault.DataLayer = new ThreadSafeDataLayer(dictionary, provider);
}

XPO_how-to-bind-data-to-winforms-controls-using-xpservermodeview-or-xpinstantfeedbackview/CS/XPServerModeViewDemo/DataAccess/ConnectionHelper.cs#L16

public static void Connect(bool threadSafe = true) {
    XpoDefault.DataLayer = CreateDataLayer(threadSafe);
}

XPO_how-to-bind-data-to-wpf-controls-using-xpservermodeview-or-xpinstantfeedbackview/CS/WpfApplication/DataAccess/ConnectionHelper.cs#L16

public static void Connect(bool threadSafe = true) {
    XpoDefault.DataLayer = CreateDataLayer(threadSafe);
}

VB.NET

XPO_how-to-make-user-friendly-object-identifiers-e825/VB/Program.vb#L18

Shared Sub Main(ByVal args() As String)
    XpoDefault.DataLayer = XpoDefault.GetDataLayer(AutoCreateOption.DatabaseAndSchema)
    [Do]("A")

XAF_how-to-create-a-recurring-appointment-via-code-e1283/VB/Program.vb#L17

Dim store As IDataStore = XpoDefault.GetConnectionProvider(connectionString, AutoCreateOption.DatabaseAndSchema)
XpoDefault.DataLayer = New SimpleDataLayer(dict, store)
XpoDefault.Session = Nothing

Create-a-Report-Bound-To-XPObjectSource/VB/Create a Report Bound to XPObjectSource/ORMDataModel1Code/ConnectionHelper.vb#L38

    dictionary.GetDataStoreSchema(persistentTypes)
    XpoDefault.DataLayer = New ThreadSafeDataLayer(dictionary, provider)
Else

XPO_how-to-bind-data-to-winforms-controls-using-xpservermodeview-or-xpinstantfeedbackview/VB/XPServerModeViewDemo/DataAccess/ConnectionHelper.vb#L13

Public Sub Connect(Optional ByVal threadSafe As Boolean = True)
    XpoDefault.DataLayer = CreateDataLayer(threadSafe)
End Sub

XPO_how-to-implement-custom-aggregates/VB/XpoCustomAggregate/DataAccess/ConnectionHelper.vb#L13

Public Sub Connect(Optional ByVal threadSafe As Boolean = True)
    XpoDefault.DataLayer = CreateDataLayer(threadSafe)
End Sub