MemberExpression 類別

定義

代表存取欄位或屬性。Represents accessing a field or property.

public ref class MemberExpression : System::Linq::Expressions::Expression
public ref class MemberExpression sealed : System::Linq::Expressions::Expression
public class MemberExpression : System.Linq.Expressions.Expression
public sealed class MemberExpression : System.Linq.Expressions.Expression
type MemberExpression = class
    inherit Expression
Public Class MemberExpression
Inherits Expression
Public NotInheritable Class MemberExpression
Inherits Expression
繼承
MemberExpression

範例

下列範例 MemberExpression 會建立,表示取得欄位成員的值。The following example creates a MemberExpression that represents getting the value of a field member.

class Animal
{
    public string species;
}

public static void CreateFieldExpression()
{
    Animal horse = new Animal();

    // Create a MemberExpression that represents getting
    // the value of the 'species' field of class 'Animal'.
    System.Linq.Expressions.MemberExpression memberExpression =
        System.Linq.Expressions.Expression.Field(
            System.Linq.Expressions.Expression.Constant(horse),
            "species");

    Console.WriteLine(memberExpression.ToString());

    // This code produces the following output:
    //
    // value(CodeSnippets.FieldExample+Animal).species
}
Class Animal
    Dim species As String
End Class

Shared Sub CreateFieldExpression()
    Dim horse As New Animal

    ' Create a MemberExpression that represents getting
    ' the value of the 'species' field of class 'Animal'.
    Dim memberExpression As System.Linq.Expressions.MemberExpression = _
        System.Linq.Expressions.Expression.Field( _
            System.Linq.Expressions.Expression.Constant(horse), _
            "species")

    Console.WriteLine(memberExpression.ToString())

    ' This code produces the following output:
    '
    ' value(ExpressionVB.FieldExample+Animal).species
End Sub

備註

使用 Field PropertyPropertyOrField factory 方法來建立 MemberExpressionUse the Field, Property or PropertyOrField factory methods to create a MemberExpression.

NodeType 屬性值 MemberExpressionMemberAccessThe value of the NodeType property of a MemberExpression is MemberAccess.

屬性

CanReduce

表示節點可精簡為更簡單的節點。Indicates that the node can be reduced to a simpler node. 如果傳回 true,則可呼叫 Reduce() 以產生精簡的形式。If this returns true, Reduce() can be called to produce the reduced form.

(繼承來源 Expression)
Expression

取得欄位或屬性的包含物件。Gets the containing object of the field or property.

Member

取得要存取的欄位或屬性。Gets the field or property to be accessed.

NodeType

傳回這個 Expression 的節點類型。Returns the node type of this Expression.

NodeType

取得這個 Expression 的節點類型。Gets the node type of this Expression.

(繼承來源 Expression)
Type

取得此 Expression 代表之運算式的靜態類型。Gets the static type of the expression that this Expression represents.

(繼承來源 Expression)

方法

Accept(ExpressionVisitor)

分派給這個節點類型的特定造訪方法。Dispatches to the specific visit method for this node type. 例如,MethodCallExpression 會呼叫 VisitMethodCall(MethodCallExpression)For example, MethodCallExpression calls the VisitMethodCall(MethodCallExpression).

Accept(ExpressionVisitor)

分派給這個節點類型的特定造訪方法。Dispatches to the specific visit method for this node type. 例如,MethodCallExpression 會呼叫 VisitMethodCall(MethodCallExpression)For example, MethodCallExpression calls the VisitMethodCall(MethodCallExpression).

(繼承來源 Expression)
Equals(Object)

判斷指定的物件是否等於目前的物件。Determines whether the specified object is equal to the current object.

(繼承來源 Object)
GetHashCode()

做為預設雜湊函式。Serves as the default hash function.

(繼承來源 Object)
GetType()

取得目前執行個體的 TypeGets the Type of the current instance.

(繼承來源 Object)
MemberwiseClone()

建立目前 Object 的淺層複製。Creates a shallow copy of the current Object.

(繼承來源 Object)
Reduce()

將這個節點精簡為更簡單的運算式。Reduces this node to a simpler expression. 如果 CanReduce 傳回 true,則應該傳回有效的運算式。If CanReduce returns true, this should return a valid expression. 這個方法可以傳回其他本身必須精簡的節點。This method can return another node which itself must be reduced.

(繼承來源 Expression)
ReduceAndCheck()

將這個節點精簡為更簡單的運算式。Reduces this node to a simpler expression. 如果 CanReduce 傳回 true,則應該傳回有效的運算式。If CanReduce returns true, this should return a valid expression. 這個方法可以傳回其他本身必須精簡的節點。This method can return another node which itself must be reduced.

(繼承來源 Expression)
ReduceExtensions()

將運算式精簡為已知的節點類型 (不是 Extension 節點),如果已經是已知的類型,則僅傳回運算式。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.

(繼承來源 Expression)
ToString()

傳回 Expression 的文字表示。Returns a textual representation of the Expression.

(繼承來源 Expression)
Update(Expression)

建立類似這個運算式的新運算式,但使用提供的子系。Creates a new expression that is like this one, but using the supplied children. 如果所有子系都相同,則會傳回這個運算式。If all of the children are the same, it will return this expression.

VisitChildren(ExpressionVisitor)

精簡節點,然後呼叫精簡後的運算式上的訪問項委派。Reduces the node and then calls the visitor delegate on the reduced expression. 如果節點無法縮減,此方法會擲回例外狀況。The method throws an exception if the node is not reducible.

(繼承來源 Expression)

適用於