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.NET Framework 4.5.2+

Session.GetObjectsFromQuery(XPClassInfo, List<XPMemberInfo>, String, QueryParameterCollection) Method

Executes a SQL query and returns its result set as a collection of non-persistent objects.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v22.1.dll


public ICollection GetObjectsFromQuery(
    XPClassInfo classInfo,
    List<XPMemberInfo> members,
    string sql,
    QueryParameterCollection parameters


Name Type Description
classInfo XPClassInfo

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

members List<XPMemberInfo>

Specifies object members mapped to columns in the result set. The order of list elements should correspond to the order of result set columns.

sql String

Specifies an SQL statement.

parameters QueryParameterCollection

Specifies query parameter values.


Type Description

A collection of non-persistent classInfo objects instantiated with data obtained via the specified SQL query.


Use QueryParameterCollection to pass strongly-typed parameters. See examples here: Always Encrypted (SQL Server only).

The connection provider automatically generates sequential parameter names (p0, p1, p2 …). To specify custom parameter names, use the overloaded GetObjectsFromQuery(XPClassInfo, List<XPMemberInfo>, String, String[], QueryParameterCollection) method.

This method does the following:

  • Executes the specified SQL query and obtains the query result.
  • Creates objects using the specified classInfo and populates their properties with the resulting set’s data The members parameter specifies the mapping between columns in the resulting set and object properties. Note that classInfo should represent a non-persistent class decorated with a NonPersistentAttribute.


The GetObjectsFromQuery method throws an exception if the members array 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 SQL statements in XPO, refer to Direct SQL Queries.


The GetObjectsFromQuery method sends statements directly, so the correct statement syntax and parameter names format depends on a particular database server.

See Also