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

Session.GetObjectsFromSprocParametrizedAsync(CancellationToken, XPClassInfo, LoadDataMemberOrderItem[], String, SprocParameter[]) Method

Executes a stored procedure with named parameters and returns its result set as a collection of non-persistent objects.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v21.1.dll

Declaration

public Task<ICollection> GetObjectsFromSprocParametrizedAsync(
    CancellationToken cancellationToken,
    XPClassInfo classInfo,
    LoadDataMemberOrderItem[] members,
    string sprocName,
    params SprocParameter[] parameters
)

Parameters

Name Type Description
cancellationToken CancellationToken

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

classInfo XPClassInfo

An XPClassInfo object which contains the metadata information on a non-persistent class corresponding to the stored procedure’s result set. The class must be decorated with NonPersistentAttribute.

members LoadDataMemberOrderItem[]

An array of LoadDataMemberOrderItem objects which provide mapping information for classInfo members and the stored procedure’s result set columns.

sprocName String

A String value that specifies the stored procedure’s name.

parameters DevExpress.Xpo.DB.SprocParameter[]

An array of SprocParameter objects specifying parameters to pass to the stored procedure.

Returns

Type Description
Task<ICollection>

A Task<TResult> that returns a collection of non-persistent classInfo objects instantiated with data obtained via the specified stored procedure.

Remarks

XPClassInfo classInfo = session.GetClassInfo<CustOrderHistModel>();
LoadDataMemberOrderItem[] members = new LoadDataMemberOrderItem[] {
    new LoadDataMemberOrderItem(0, nameof(CustOrderHistModel.ProductName)),
    new LoadDataMemberOrderItem(1, nameof(CustOrderHistModel.Total))
};
ICollection sprocResultData = await session.GetObjectsFromSprocParametrizedAsync(CancellationToken.None, classInfo, members, "CustOrderHist", new SprocParameter("CustomerID", "ALFKI"));

This method performs the following:

  • Executes the specified stored procedure with parameters and obtains the result as a result set.
  • Populates a collection with classInfo objects that are instantiated with the result set’s data based on the mapping information passed as the members parameter. Note that classInfo should represent a non-persistent class decorated with a NonPersistentAttribute.

This method takes named parameters. The parameter order is arbitrary. The SprocParameter.Direction property should be set to Output for out parameters. Based on the current ADO.NET provider, the data type (SprocParameter.DbType), scale (SprocParameter.Scale) and precision (SprocParameter.Precision) may be required.

Note

The GetObjectsFromSprocParametrizedAsync method throws an exception if the members list includes any of the following classInfo members:

  • A property that is not defined within the classInfo object.
  • A struct type member.
  • A reference to a class with a struct type member.
  • A collection used in object relations.

To learn more about executing stored procedures in XPO and retrieving objects from the results, refer to Stored Procedures.

See Also