MemberExpression.cs

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using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Dynamic.Utils;
using System.Reflection;
 
namespace System.Linq.Expressions;
 
[DebuggerTypeProxy(typeof(MemberExpressionProxy))]
public class MemberExpression : Expression
{
    public MemberInfo Member => GetMember();
 
    public Expression? Expression { get; }
 
    public sealed override ExpressionType NodeType => ExpressionType.MemberAccess;
 
    internal MemberExpression(Expression expression)
    {
        Expression = expression;
    }
 
    internal static PropertyExpression Make(Expression expression, PropertyInfo property)
    {
        return new PropertyExpression(expression, property);
    }
 
    internal static FieldExpression Make(Expression expression, FieldInfo field)
    {
        return new FieldExpression(expression, field);
    }
 
    internal static MemberExpression Make(Expression expression, MemberInfo member)
    {
        FieldInfo fieldInfo = member as FieldInfo;
        if (!(fieldInfo == null))
        {
            return Make(expression, fieldInfo);
        }
        return Make(expression, (PropertyInfo)member);
    }
 
    [ExcludeFromCodeCoverage(Justification = "Unreachable")]
    internal virtual MemberInfo GetMember()
    {
        throw ContractUtils.Unreachable;
    }
 
    protected internal override Expression Accept(ExpressionVisitor visitor)
    {
        return visitor.VisitMember(this);
    }
 
    public MemberExpression Update(Expression? expression)
    {
        if (expression == Expression)
        {
            return this;
        }
        return System.Linq.Expressions.Expression.MakeMemberAccess(expression, Member);
    }
}