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

Searches for the first object that matches the specified lambda expression. The generic parameter determines the object’s type.

Namespace: DevExpress.ExpressApp

Assembly: DevExpress.ExpressApp.v23.2.dll

NuGet Package: DevExpress.ExpressApp

Declaration

C#

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

VB.NET

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

Parameters

Name	Type	Description
criteriaExpression	Expression<Func<ObjectType, Boolean>>	A lambda expression to search for an object.

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 invokes the public virtual FirstOrDefault<ObjectType>(Expression<Func<ObjectType, Boolean>>, Boolean) method that does nothing and returns null (Nothing in VB). Override this virtual method in a BaseObjectSpace descendant to implement an object search.

Implements

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