New Method (Type)

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 constructor without parameters for the specified type.

Exception Condition
ArgumentNullException

type is null.

ArgumentException

The type that type represents does not have a constructor without parameters.

The type parameter must represent a type that has a constructor without parameters.

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 constructor without parameters.

// 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()

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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