Expression.ListInit Method (NewExpression, Expression[])

Creates a ListInitExpression that uses a method named "Add" to add elements to a collection.

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

public static ListInitExpression ListInit(
	NewExpression newExpression,
	params Expression[] initializers
)

Parameters

newExpression
Type: System.Linq.Expressions.NewExpression

A NewExpression to set the NewExpression property equal to.

initializers
Type: System.Linq.Expressions.Expression[]

An array of Expression objects to use to populate the Initializers collection.

Return Value

Type: System.Linq.Expressions.ListInitExpression
A ListInitExpression that has the NodeType property equal to ListInit and the NewExpression property set to the specified value.

ExceptionCondition
ArgumentNullException

newExpression or initializers is null.

-or-

One or more elements of initializers are null.

ArgumentException

newExpression.Type does not implement IEnumerable.

InvalidOperationException

There is no instance method named "Add" (case insensitive) declared in newExpression.Type or its base type.

-or-

The add method on newExpression.Type or its base type does not take exactly one argument.

-or-

The type represented by the Type property of the first element of initializers is not assignable to the argument type of the add method on newExpression.Type or its base type.

-or-

More than one argument-compatible method named "Add" (case-insensitive) exists on newExpression.Type and/or its base type.

The Type property of newExpression must represent a type that implements IEnumerable.

In order to use this overload of ListInit(NewExpression, Expression[]), newExpression.Type or its base type must declare a single method named "Add" (case insensitive) that takes exactly one argument. The type of the argument must be assignable from the type represented by the Type property of the first element of initializers.

The Initializers property of the returned ListInitExpression contains one element of type ElementInit for each element of initializers. The Arguments property of each element of Initializers is a singleton collection that contains the corresponding element of initializers. The AddMethod property of each element of Initializers represents the add method that was discovered on newExpression.Type or its base type.

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

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

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

Portable Class Library

Supported in: Portable Class Library
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