Expression.MemberInit Method (NewExpression, IEnumerable<MemberBinding>)

Represents an expression that creates a new object and initializes a property of the object.

Namespace:  System.Linq.Expressions
Assembly:  System.Core (in System.Core.dll)

public static MemberInitExpression MemberInit(
	NewExpression newExpression,
	IEnumerable<MemberBinding> bindings
)

Parameters

newExpression
Type: System.Linq.Expressions.NewExpression

A NewExpression to set the NewExpression property equal to.

bindings
Type: System.Collections.Generic.IEnumerable<MemberBinding>

An IEnumerable<T> that contains MemberBinding objects to use to populate the Bindings collection.

Return Value

Type: System.Linq.Expressions.MemberInitExpression
A MemberInitExpression that has the NodeType property equal to MemberInit and the NewExpression and Bindings properties set to the specified values.

ExceptionCondition
ArgumentNullException

newExpression or bindings is null.

ArgumentException

The Member property of an element of bindings does not represent a member of the type that newExpression.Type represents.

The Type property of the resulting MemberInitExpression is equal to the Type property of newExpression.

The following example demonstrates an expression that creates a new object and initializes a property of the object.


// Add the following directive to your file: 
// using System.Linq.Expressions;   

class TestMemberInitClass
{
    public int sample { get; set; }
}

static void MemberInit()
{   
    // This expression creates a new TestMemberInitClass object 
    // and assigns 10 to its sample property.
    Expression testExpr = Expression.MemberInit(
        Expression.New(typeof(TestMemberInitClass)),
        new List<MemberBinding>() {
            Expression.Bind(typeof(TestMemberInitClass).GetMember("sample")[0], Expression.Constant(10))
        }
    );

    // The following statement first creates an expression tree, 
    // then compiles it, and then runs it. 
    var test = Expression.Lambda<Func<TestMemberInitClass>>(testExpr).Compile()();
    Console.WriteLine(test.sample);
}

// This code example produces the following output: 
// 
// 10

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Was this page helpful?
(1500 characters remaining)
Thank you for your feedback
Show:
© 2014 Microsoft