Snippets

dynamic-select.cs

public Func<T,T> AsProjections<T>(string fields) where T: class
{
    var xParameter = Expression.Parameter(typeof(T), "o");

    var xNew = Expression.New(typeof(T));

    var bindings = fields.Split('.')
        .Select(o => o.Trim())
        .Select(o => 
          {
            var mi = typeof(T).GetProperty(o);

            var xOriginal = Expression.Property(xParameter, mi);

            return Expression.Bind(mi, xOriginal);
          }
        );

    var xInit = Expression.MemberInit(xNew, bindings);

    var lambda = Expression.Lambda<Func<T,T>>(xInit, xParameter);

    return lambda.Compile();
}