XPQuery<T>.TransformExpression(Expression<Func<T, Boolean>>) Method

Converts a lambda expression into an instance of the CriteriaOperator class descendant.

Assembly : DevExpress.Xpo.v25.2.dll

Declaration

C#
VB.NET

csharp

public CriteriaOperator TransformExpression(
    Expression<Func<T, bool>> expression
)

Public Function TransformExpression(
    expression As Expression(Of Func(Of T, Boolean))
) As CriteriaOperator

Parameters

Name	Type	Description
expression	Expression<Func<T, Boolean>>

A lambda expression.

Returns

Type	Description
CriteriaOperator

An instance of the CriteriaOperator class descendant that represents the lambda expression.

Example

In the following code snippet the customers collection will contain only the customers named “Bob”:

C#
VB.NET

csharp

using DevExpress.Xpo;
using DevExpress.Data.Filtering;

//...

Session MainSession = new Session();
XPQuery<Customer> customersQuery = new XPQuery<Customer>(MainSession);

CriteriaOperator criteria = customersQuery.TransformExpression(c => c.Name == "Bob");

XPCollection<Customer> customers = new XPCollection<Customer>(MainSession);
customers.Criteria = criteria;

Imports DevExpress.Xpo
Imports DevExpress.Data.Filtering

'...

Dim MainSession As New Session()
Dim customersQuery As XPQuery(Of Customer) = New XPQuery(Of Customer)(MainSession)

Dim criteria As CriteriaOperator = customersQuery.TransformExpression(Function(c) c.Name = "Bob")

Dim customers As XPCollection(Of Customer) = New XPCollection(Of Customer)(MainSession)
customers.Criteria = criteria