CreateNestedSetExpression.cs

/// <summary>
/// Generates an Expression that can set a nested property
/// </summary>
/// <param name="path">a list of nested properties </param>
/// <returns>the compiled set expression</returns>
public Expression<Action<T, object>> CreateNestedSet(List<string> path)
{
    // target
    var targetParameterExpression = Expression.Parameter(typeof(T), "target");

    // target.nested.path
    var propertyExpression = path.Aggregate<string, Expression>(targetParameterExpression, (c, m) => Expression.Property(c, m));

    //value
    var valueParameterExpression = Expression.Parameter(typeof(object), "value");

    // (type) value;
    var castedValueExpression = Expression.Convert(valueParameterExpression, propertyExpression.Type);

    //target.nested.path = (type) value
    var assignExpression = Expression.Assign(propertyExpression, castedValueExpression);

    // (target, value) => target.nested.path = (type) value;
    var assign = Expression.Lambda<Action<T, object>>(assignExpression,targetParameterExpression, valueParameterExpression);

    return assign;

}