MemberInitExpression MemberInitExpression MemberInitExpression MemberInitExpression Class

定義

コンストラクターの呼び出しと、新しいオブジェクトの 1 つまたは複数のメンバーの初期化を表します。Represents calling a constructor and initializing one or more members of the new object.

public ref class MemberInitExpression sealed : System::Linq::Expressions::Expression
public sealed class MemberInitExpression : System.Linq.Expressions.Expression
type MemberInitExpression = class
    inherit Expression
Public NotInheritable Class MemberInitExpression
Inherits Expression
継承
MemberInitExpressionMemberInitExpressionMemberInitExpressionMemberInitExpression

次の例では、作成、MemberInitExpression新しいオブジェクトの 2 つのメンバーの初期化を表します。The following example creates a MemberInitExpression that represents the initialization of two members of a new object.

class Animal
{
    public string Species {get; set;}
    public int Age {get; set;}
}

public static void CreateMemberInitExpression()
{
    System.Linq.Expressions.NewExpression newAnimal =
        System.Linq.Expressions.Expression.New(typeof(Animal));

    System.Reflection.MemberInfo speciesMember =
        typeof(Animal).GetMember("Species")[0];
    System.Reflection.MemberInfo ageMember =
        typeof(Animal).GetMember("Age")[0];

    // Create a MemberBinding object for each member
    // that you want to initialize.
    System.Linq.Expressions.MemberBinding speciesMemberBinding =
        System.Linq.Expressions.Expression.Bind(
            speciesMember,
            System.Linq.Expressions.Expression.Constant("horse"));
    System.Linq.Expressions.MemberBinding ageMemberBinding =
        System.Linq.Expressions.Expression.Bind(
            ageMember,
            System.Linq.Expressions.Expression.Constant(12));

    // Create a MemberInitExpression that represents initializing
    // two members of the 'Animal' class.
    System.Linq.Expressions.MemberInitExpression memberInitExpression =
        System.Linq.Expressions.Expression.MemberInit(
            newAnimal,
            speciesMemberBinding,
            ageMemberBinding);

    Console.WriteLine(memberInitExpression.ToString());

    // This code produces the following output:
    //
    // new Animal() {Species = "horse", Age = 12}
}
Class Animal
    Public Species As String
    Public Age As Integer
End Class

Shared Sub CreateMemberInitExpression()
    Dim newAnimal As System.Linq.Expressions.NewExpression = _
        System.Linq.Expressions.Expression.[New](Type.GetType("ExpressionVB.MemberInitExample+Animal"))

    Dim speciesMember As System.Reflection.MemberInfo = _
        Type.GetType("ExpressionVB.MemberInitExample+Animal").GetMember("Species")(0)
    Dim ageMember As System.Reflection.MemberInfo = _
        Type.GetType("ExpressionVB.MemberInitExample+Animal").GetMember("Age")(0)

    ' Create a MemberBinding object for each member
    ' that you want to initialize.
    Dim speciesMemberBinding As System.Linq.Expressions.MemberBinding = _
        System.Linq.Expressions.Expression.Bind( _
            speciesMember, _
            System.Linq.Expressions.Expression.Constant("horse"))
    Dim ageMemberBinding As System.Linq.Expressions.MemberBinding = _
        System.Linq.Expressions.Expression.Bind( _
            ageMember, _
            System.Linq.Expressions.Expression.Constant(12))

    ' Create a MemberInitExpression that represents initializing
    ' two members of the 'Animal' class.
    Dim memberInitExpression As System.Linq.Expressions.MemberInitExpression = _
        System.Linq.Expressions.Expression.MemberInit( _
            newAnimal, _
            speciesMemberBinding, _
            ageMemberBinding)

    Console.WriteLine(memberInitExpression.ToString())

    ' This code produces the following output:
    '
    ' new Animal() {Species = "horse", Age = 12}
End Sub

注釈

使用して、MemberInit作成するファクトリ メソッドをMemberInitExpressionします。Use the MemberInit factory methods to create a MemberInitExpression.

値、NodeTypeのプロパティをMemberInitExpressionMemberInitします。The value of the NodeType property of a MemberInitExpression is MemberInit.

プロパティ

Bindings Bindings Bindings Bindings

新しく作成されたオブジェクトのメンバーを初期化する方法を記述するバインディングを取得します。Gets the bindings that describe how to initialize the members of the newly created object.

CanReduce CanReduce CanReduce CanReduce

式ツリー ノードを縮小できるかどうかを示す値を取得します。Gets a value that indicates whether the expression tree node can be reduced.

NewExpression NewExpression NewExpression NewExpression

コンストラクター呼び出しを表す式を取得します。Gets the expression that represents the constructor call.

NodeType NodeType NodeType NodeType

この式のノード型を返します。Returns the node type of this Expression. 拡張ノードは、このメソッドをオーバーライドする際に Extension を返す必要があります。Extension nodes should return Extension when overriding this method.

Type Type Type Type

この Expression が表す式の静的な型を取得します。Gets the static type of the expression that this Expression represents.

メソッド

Accept(ExpressionVisitor) Accept(ExpressionVisitor) Accept(ExpressionVisitor) Accept(ExpressionVisitor)

このノード型の特定の Visit メソッドにデスパッチします。Dispatches to the specific visit method for this node type. たとえば、MethodCallExpressionVisitMethodCall(MethodCallExpression) を呼び出します。For example, MethodCallExpression calls the VisitMethodCall(MethodCallExpression).

(Inherited from Expression)
Equals(Object) Equals(Object) Equals(Object) Equals(Object)

指定したオブジェクトが、現在のオブジェクトと等しいかどうかを判断します。Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

既定のハッシュ関数として機能します。Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

現在のインスタンスの Type を取得します。Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

現在の Object の簡易コピーを作成します。Creates a shallow copy of the current Object.

(Inherited from Object)
Reduce() Reduce() Reduce() Reduce()

MemberInitExpression をより単純な式へと変形します。Reduces the MemberInitExpression to a simpler expression.

ReduceAndCheck() ReduceAndCheck() ReduceAndCheck() ReduceAndCheck()

このノードをより単純な式に変形します。Reduces this node to a simpler expression. CanReduce が true を返す場合、これは有効な式を返します。If CanReduce returns true, this should return a valid expression. このメソッドは、それ自体も単純化する必要がある別のノードを返す場合があります。This method can return another node which itself must be reduced.

(Inherited from Expression)
ReduceExtensions() ReduceExtensions() ReduceExtensions() ReduceExtensions()

式を既知のノード型 (拡張ノードではない型) に単純化し、それが既に既知の型である場合は単に式を返します。Reduces the expression to a known node type (that is not an Extension node) or just returns the expression if it is already a known type.

(Inherited from Expression)
ToString() ToString() ToString() ToString()

Expression のテキスト表現を返します。Returns a textual representation of the Expression.

(Inherited from Expression)
Update(NewExpression, IEnumerable<MemberBinding>) Update(NewExpression, IEnumerable<MemberBinding>) Update(NewExpression, IEnumerable<MemberBinding>) Update(NewExpression, IEnumerable<MemberBinding>)

この式に似た新しい式を作成しますが、指定された子を使用します。Creates a new expression that is like this one, but using the supplied children. すべての子が同じであれば、この式が返されます。If all of the children are the same, it will return this expression.

VisitChildren(ExpressionVisitor) VisitChildren(ExpressionVisitor) VisitChildren(ExpressionVisitor) VisitChildren(ExpressionVisitor)

ノードを単純化し、単純化された式の visitor デリゲートを呼び出します。Reduces the node and then calls the visitor delegate on the reduced expression. ノードを単純化できない場合、このメソッドは例外をスローします。The method throws an exception if the node is not reducible.

(Inherited from Expression)

適用対象