Comments on: Dynamic Linq with Expression Trees http://www.marcuswhitworth.com/2009/12/dynamic-linq-with-expression-trees/ Marcus Whitworth's tech blog – .NET, C#, Silverlight, WPF, Flex…etc, etc Wed, 02 Dec 2009 23:28:05 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: Marcus http://www.marcuswhitworth.com/2009/12/dynamic-linq-with-expression-trees/comment-page-1/#comment-10 Marcus Wed, 02 Dec 2009 23:28:05 +0000 http://www.marcuswhitworth.com/?p=106#comment-10 <blockquote><em>In the UI you show, how do you select both London & NY. That doesn’t seem to work the code either.</em></blockquote> That's not yet a requirement, but if/when it is, I'd need to introduce some logic like PredicateBuilder in the back end, and some optional rule grouping by 'OR/AND' in the client UI to enable it.

In the UI you show, how do you select both London & NY. That doesn’t seem to work the code either.

That’s not yet a requirement, but if/when it is, I’d need to introduce some logic like PredicateBuilder in the back end, and some optional rule grouping by ‘OR/AND’ in the client UI to enable it.

]]> By: Aaron Goldman http://www.marcuswhitworth.com/2009/12/dynamic-linq-with-expression-trees/comment-page-1/#comment-9 Aaron Goldman Wed, 02 Dec 2009 20:36:12 +0000 http://www.marcuswhitworth.com/?p=106#comment-9 This is a cool demonstration of expression tree building. I have to do this sometime. I have almost the exact same requirement in my current project. My data is in arrays, so in a way its more straightforward. I created 2 filter types - 1 for enums and 1 for range filtering. Everything is bound to a WPF UI so when the user selects the field, they're also selecting the index into the array (as a property of the Field type). Also, the user selects in a slider for ranges and a list for enums. In the UI you show, how do you select both London & NY. That doesn't seem to work the code either. In the end, my filtering in Linq looks very similar to yours and the whole system is nearly logically identical. This is a cool demonstration of expression tree building. I have to do this sometime.

I have almost the exact same requirement in my current project. My data is in arrays, so in a way its more straightforward.

I created 2 filter types – 1 for enums and 1 for range filtering. Everything is bound to a WPF UI so when the user selects the field, they’re also selecting the index into the array (as a property of the Field type). Also, the user selects in a slider for ranges and a list for enums. In the UI you show, how do you select both London & NY. That doesn’t seem to work the code either.

In the end, my filtering in Linq looks very similar to yours and the whole system is nearly logically identical.

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