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Expression.ListInit Method (NewExpression, MethodInfo, IEnumerable<Expression>)

Creates a ListInitExpression that uses a specified method to add elements to a collection.

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

public static ListInitExpression ListInit(
	NewExpression newExpression,
	MethodInfo addMethod,
	IEnumerable<Expression> initializers
)

Parameters

newExpression
Type: System.Linq.Expressions.NewExpression

A NewExpression to set the NewExpression property equal to.

addMethod
Type: System.Reflection.MethodInfo

A MethodInfo that represents an instance method named "Add" (case insensitive), that adds an element to a collection.

initializers
Type: System.Collections.Generic.IEnumerable<Expression>

An IEnumerable<T> that contains 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 is null.

ArgumentException

newExpression.Type does not implement IEnumerable.

-or-

addMethod is not null and it does not represent an instance method named "Add" (case insensitive) that takes exactly one argument.

-or-

addMethod is not null and the type represented by the Type property of one or more elements of initializers is not assignable to the argument type of the method that addMethod represents.

InvalidOperationException

addMethod is null and no instance method named "Add" that takes one type-compatible argument exists on newExpression.Type or its base type.

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

If addMethod is null, newExpression.Type or its base type must declare a single method named "Add" (case insensitive) that takes exactly one argument. If addMethod is not null, it must represent an instance method named "Add" (case insensitive) that has exactly one parameter. The type represented by the Type property of each element of initializers must be assignable to the argument type of the add method.

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 is equal to addMethod.

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

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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