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.NET Standard 2.0+
.NET Framework 4.5.2+
.NET Standard 2.0+

Session.CreateObjectTypeRecordsAsync(CancellationToken, Boolean, Assembly[]) Method

Asynchronously stores valid persistent types for all the types which are defined within the specified assemblies.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v20.2.dll

Declaration

public Task CreateObjectTypeRecordsAsync(
    CancellationToken cancellationToken,
    bool createOnlyNecessary,
    params Assembly[] assemblies
)

Parameters

Name Type Description
cancellationToken CancellationToken

A CancellationToken object that delivers a cancellation notice to the running operation.

createOnlyNecessary Boolean

true, to create object type records only for types that require this to function properly, such as types from inheritance chains, or types utilizing deferred deletion; false, to create object type records for all persistent types.

assemblies Assembly[]

An array of assemblies which contain the class types for which the persistent types will be stored in the metadata information.

Returns

Type Description
Task

A Task that stores valid persistent types for all the types which are defined within the specified assemblies.

Remarks

For thread-safe data access layers (see ThreadSafeDataLayer) to function correctly, it's necessary to provide complete metadata information on the persistent objects in a data store before performing any operations with persistent objects. Call the CreateObjectTypeRecordsAsync method and pass persistent class metadata information as the types parameter to store valid persistent types for the corresponding persistent objects. This creates all the necessary records within a special table called XPObjectType which is used to support object polymorphism.

using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using DevExpress.Xpo;
using DevExpress.Xpo.DB;
// ...
public async Task CreateDatabase(string connectionString, params Assembly[] assemblies) {
    using(IDataLayer dal = XpoDefault.GetDataLayer(connectionString, AutoCreateOption.DatabaseAndSchema)) {
        UnitOfWork uow = new UnitOfWork(dal);
        await uow.UpdateSchemaAsync(CancellationToken.None, assemblies);
        await uow.CreateObjectTypeRecordsAsync(CancellationToken.None, true, assemblies);
    }
}
See Also