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Expression.New Method (Type)

Creates a NewExpression that represents calling the parameterless constructor of the specified type.

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

public static NewExpression New(
	Type type
)

Parameters

type
Type: System.Type

A Type that has a constructor that takes no arguments.

Return Value

Type: System.Linq.Expressions.NewExpression
A NewExpression that has the NodeType property equal to New and the Constructor property set to the ConstructorInfo that represents the parameterless constructor of the specified type.

ExceptionCondition
ArgumentNullException

type is null.

ArgumentException

The type that type represents does not have a parameterless constructor.

The type parameter must represent a type that has a parameterless constructor.

The Arguments and Members properties of the resulting NewExpression are empty collections. The Type property is equal to type.

The following example demonstrates how to use the New(Type) method to create a NewExpression that represents constructing a new instance of a dictionary object by calling the parameterless constructor.

// Create a NewExpression that represents constructing 
// a new instance of Dictionary<int, string>.
System.Linq.Expressions.NewExpression newDictionaryExpression =
    System.Linq.Expressions.Expression.New(typeof(Dictionary<int, string>));

Console.WriteLine(newDictionaryExpression.ToString());

// This code produces the following output: 
// 
// new Dictionary`2()

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

.NET Framework

Supported in: 3.5
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