Access the value of a member expression

by

You can compile and invoke a lambda expression whose body is the member access:

private object GetValue(MemberExpression member)
{
    var objectMember = Expression.Convert(member, typeof(object));

    var getterLambda = Expression.Lambda<Func<object>>(objectMember);

    var getter = getterLambda.Compile();

    return getter();
}

Local evaluation is a common technique when parsing expression trees. LINQ to SQL does this exact thing in quite a few places.

More Related Contents:

  1. Retrieving Property name from lambda expression
  2. Mutating the expression tree of a predicate to target another type
  3. How do I dynamically create an Expression predicate?
  4. Linq – Where().Where() is AND or OR?
  5. System.Linq.Expression.Compile error
  6. How to LINQ List and flatten it using SelectMany?
  7. Combining two expressions (Expression)
  8. Why would you use Expression rather than Func?
  9. Join/Where with LINQ and Lambda
  10. How to create LINQ Expression Tree to select an anonymous type
  11. How do I apply OrderBy on an IQueryable using a string column name within a generic extension method?
  12. How to perform Join between multiple tables in LINQ lambda
  13. How can I get every nth item from a List?
  14. How do I invoke an extension method using reflection?
  15. Pass expression parameter as argument to another expression
  16. Expression.Lambda and query generation at runtime, simplest “Where” example
  17. What is the Efficiency and Performance of LINQ and Lambda Expression in .Net?
  18. How to convert an expression tree to a partial SQL query?
  19. Generate EF orderby expression by string [duplicate]
  20. C# Pass Lambda Expression as Method Parameter
  21. Cannot convert lambda expression to type ‘string’ because it is not a delegate type [duplicate]
  22. LINQ – Query syntax vs method chains & lambda [closed]
  23. LINQ identity function
  24. LINQ Expression to return Property value?
  25. How do I dynamically create an Expression predicate from Expression?
  26. String.IsNullOrWhiteSpace in LINQ Expression
  27. Max return value if empty query
  28. How do I translate an expression tree of one type to a different expression type?
  29. Getting the object out of a MemberExpression?
  30. Convert DataTable to Generic List in C#

Leave a Comment