BaseObjectSpace.FirstOrDefault<ObjectType>(Expression<Func<ObjectType, Boolean>>, Boolean) Method

Searches for the first object that matches the specified lambda expression. The generic parameter determines the object’s type. This method takes uncommitted changes into account.

Namespace: DevExpress.ExpressApp

Assembly: DevExpress.ExpressApp.v23.2.dll

NuGet Package: DevExpress.ExpressApp

Declaration

C#

public virtual ObjectType FirstOrDefault<ObjectType>(
    Expression<Func<ObjectType, bool>> criteriaExpression,
    bool inTransaction
)
    where ObjectType : class

VB.NET

Public Overridable Function FirstOrDefault(Of ObjectType As Class)(
    criteriaExpression As Expression(Of Func(Of ObjectType, Boolean)),
    inTransaction As Boolean
) As ObjectType

Parameters

Name	Type	Description
criteriaExpression	Expression<Func<ObjectType, Boolean>>	A lambda expression to search for an object.
inTransaction	Boolean	true if the method takes unsaved changes into account; otherwise, false.

Type Parameters

Name	Description
ObjectType	The Type of an object to be returned.

Returns

Type	Description
ObjectType	The first object that matches the specified lambda expression.

Remarks

This method does nothing and returns null (Nothing in VB), override it in BaseObjectSpace descendants.

Implements

FirstOrDefault<ObjectType>(Expression<Func<ObjectType, Boolean>>, Boolean)