Expression.Field 메서드

Source:

MemberExpression.cs

Source:

MemberExpression.cs

Source:

MemberExpression.cs

public:
 static System::Linq::Expressions::MemberExpression ^ Field(System::Linq::Expressions::Expression ^ expression, System::Reflection::FieldInfo ^ field);

public static System.Linq.Expressions.MemberExpression Field (System.Linq.Expressions.Expression expression, System.Reflection.FieldInfo field);

public static System.Linq.Expressions.MemberExpression Field (System.Linq.Expressions.Expression? expression, System.Reflection.FieldInfo field);

static member Field : System.Linq.Expressions.Expression * System.Reflection.FieldInfo -> System.Linq.Expressions.MemberExpression

Public Shared Function Field (expression As Expression, field As FieldInfo) As MemberExpression

매개 변수

반환

MemberExpression 속성이 NodeType이고 MemberAccess 및 Expression 속성이 지정된 값으로 설정된 Member입니다.

예외

설명

Type 결과 MemberExpression 의 속성은 의 field속성과 FieldType 같습니다.

Source:

MemberExpression.cs

Source:

MemberExpression.cs

Source:

MemberExpression.cs

public:
 static System::Linq::Expressions::MemberExpression ^ Field(System::Linq::Expressions::Expression ^ expression, System::String ^ fieldName);

public static System.Linq.Expressions.MemberExpression Field (System.Linq.Expressions.Expression expression, string fieldName);

static member Field : System.Linq.Expressions.Expression * string -> System.Linq.Expressions.MemberExpression

Public Shared Function Field (expression As Expression, fieldName As String) As MemberExpression

매개 변수

반환

MemberExpression 속성이 NodeType이고 MemberAccess 속성이 Expression으로 설정되고 expression 속성이 Member이 가리키는 필드를 나타내는 FieldInfo로 설정된 fieldName입니다.

예외

예제

다음 코드 예제에서는 필드에 액세스를 나타내는 식을 만드는 방법을 보여 줍니다.

// Add the following directive to your file:
// using System.Linq.Expressions;

class TestFieldClass
{
    int sample = 40;
}

static void TestField()
{
    TestFieldClass obj = new TestFieldClass();

    // This expression represents accessing a field.
    // For static fields, the first parameter must be null.
    Expression fieldExpr = Expression.Field(
        Expression.Constant(obj),
        "sample"
    );

    // The following statement first creates an expression tree,
    // then compiles it, and then runs it.
    Console.WriteLine(Expression.Lambda<Func<int>>(fieldExpr).Compile()());
}

// This code example produces the following output:
//
// 40

' Add the following directive to your file:
' Imports System.Linq.Expressions

Class TestFieldClass
    Dim sample As Integer = 40
End Class

Sub TestField()

    Dim obj As New TestFieldClass()

    ' This expression represents accessing a field.
    ' For static fields, the first parameter must be Nothing.
    Dim fieldExpr As Expression = Expression.Field(
          Expression.Constant(obj),
          "sample"
      )

    ' The following statement first creates an expression tree,
    ' then compiles it, and then runs it.
    Console.WriteLine(Expression.Lambda(Of Func(Of Integer))(fieldExpr).Compile()())
End Sub

' This code example produces the following output:
'
' 40

설명

Type 결과 MemberExpression 의 속성은 로 표시된 필드를 나타내는 의 FieldInfo 속성과 fieldName같습니다FieldType.

이 메서드는 를 검색합니다 expression. 이름이 fieldName인 필드에 대한 및 해당 기본 형식을 입력합니다. 공용 필드는 공용이 아닌 필드에 대해 기본 설정이 지정됩니다. 일치하는 필드를 찾은 경우 이 메서드는 해당 필드를 나타내는 및 FieldInfo 을 에 Field전달 expression 합니다.

Source:

MemberExpression.cs

Source:

MemberExpression.cs

Source:

MemberExpression.cs

public:
 static System::Linq::Expressions::MemberExpression ^ Field(System::Linq::Expressions::Expression ^ expression, Type ^ type, System::String ^ fieldName);

public static System.Linq.Expressions.MemberExpression Field (System.Linq.Expressions.Expression expression, Type type, string fieldName);

public static System.Linq.Expressions.MemberExpression Field (System.Linq.Expressions.Expression? expression, Type type, string fieldName);

static member Field : System.Linq.Expressions.Expression * Type * string -> System.Linq.Expressions.MemberExpression

Public Shared Function Field (expression As Expression, type As Type, fieldName As String) As MemberExpression

매개 변수

반환

만든 MemberExpression입니다.