// Create a MemberExpression that accesses the "Name" property of an object var memberExpression = Expression.Property(Expression.Constant(obj), "Name");
// Create a MemberExpression that accesses the "Id" field of an object var memberExpression = Expression.Field(Expression.Constant(obj), "Id");In both of these examples, the MemberExpression is created by calling the static methods of the Expression class. The first argument of each method is an Expression that represents the object that contains the property or field being accessed. The second argument is a string that represents the name of the property or field being accessed. The System.Linq.Expressions namespace is the package library where the MemberExpression class resides. It provides a set of classes and interfaces that can be used to build expressions dynamically. These classes and interfaces are used extensively by LINQ and other query languages in C#.