Matthieu MEZIL - All Comments

Un pattern şi trei implementări (partea 2)

Tudor Turcu - blog — Sun, 15 Nov 2009 14:27:50 GMT

După *** spuneam în postul precedent , fiecare O/RM are propria metodă de a descrie graful de obiecte

re: Entity Framework: Undo Redo v2

wiktor256 — Sat, 14 Nov 2009 04:41:50 GMT

Hi,

I've been trying to get it to work, and I am getting closer, but it's not pretty. I have to resort to using reflection to access unexposed .NET methods and properties. I know, that's bad, but I want to see if it is possible to make it work. The main reason for using the reflection is that there doesn't seem to be a way to undelete an entity. After poking through .NET code, I found that ObjectStateEntry.RevertDelete() does the trick.

Working with Large Databases in Entity Framework

Gil Fink on .Net — Fri, 13 Nov 2009 12:32:54 GMT

Working with Large Databases in Entity Framework Yesterday I was asked by a colleague a very good EF

re: Entity Framework: Undo Redo v2

Matthieu MEZIL — Thu, 12 Nov 2009 13:43:47 GMT

In RelatedEnd class, you have an AssociationChanged event so I think that you can use it to extend my code.

re: Entity Framework: Undo Redo v2

wiktor256 — Thu, 12 Nov 2009 01:39:20 GMT

I see that this approach works for undo/redo of simple property changes. Am I missing something?

Is there a way to also undo/redo changes in relationships between entities? For example, when a new Order is added to the Customer->Orders collection?

re: Entity Framework: Undo Redo v2

Matthieu MEZIL — Sun, 08 Nov 2009 15:54:13 GMT

It's just a POC guys.

So it's possible that there is some bugs. Sorry for it but I am too busy to fix them.

Matthieu

re: Entity Framework Include with Func next

Matthieu MEZIL — Sun, 08 Nov 2009 15:08:40 GMT

Try with DirectCast instead of TryCast. It was stupid in my case to use the as operator instead a direct cast.

re: How to use LINQ extension methods on non generic IEnumerable?

Matthieu MEZIL — Sun, 08 Nov 2009 15:02:22 GMT

I did it for a colleague who works with Sharepoint and who were very happy with this.

re: Bug with IQueryable and yield syntax: System.BadImageFormatException "An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)"

Matthieu MEZIL — Sun, 08 Nov 2009 14:46:10 GMT

This bug is now fixed (with VS 2010 Beta)

re: EDM can save your hair :-)

Matthieu MEZIL — Sun, 08 Nov 2009 14:42:29 GMT

In the SSDL, you have an attribute StoreGeneratedPattern per column. Set it to Identity.

re: POO is so pretty with C#

Matthieu MEZIL — Sun, 08 Nov 2009 14:28:37 GMT

I don't know what happens. I updated the link. It should be good now.

Sorry for the delay but I changed of my laptop and I didn't keep this project.

re: Entity Framework: Undo Redo v2

wiktor256 — Thu, 05 Nov 2009 15:37:07 GMT

Great code. I use it to undo all changes when the user clicks on a "Cancel" button.

I think I stumbled on a small bug though. The undo list becomes empty after doing group undo. Then making a change to an entity causes an IndexOfOutOfBounds exception to be thrown in the line below.

if (MultipleActions)

_undo[0].Add(undoRedoAction);

re: How to use LINQ extension methods on non generic IEnumerable?

Smartass — Sun, 01 Nov 2009 01:10:43 GMT

You just put in a ton of effort to get rid of 4 characters per invocation. Usually lazy is good, but that doesn't seem like the smart kind of lazy.

It'll probably take you years of writing .Cast<T>.LINQ() before you catch up to the amount of effort you just put into this.

I don't know how many places in your code use non-generics, but it seems like the best thing to do would have been to wrap those references to non-generics with something that'll do the .Cast<T> for you. Then it'd work for anything outside LINQ too.

re: Bug with IQueryable and yield syntax: System.BadImageFormatException "An attempt was made to load a program with an incorrect format. (Exception from HRESULT: 0x8007000B)"

Jonathan (SMT) — Wed, 28 Oct 2009 20:47:33 GMT

Has this bug been resolved yet? I am still getting it now with VS 2008 and Win7.

re: Entity Framework: Undo Redo v2

Ivan — Wed, 28 Oct 2009 10:04:21 GMT

This doesn't work. I tested it in my application and doesn't work.

Generate a WCF service from an edmx with T4 v2

Matthieu MEZIL — Tue, 27 Oct 2009 09:49:02 GMT

I recently published a T4 template to generate a WCF service . I updated it to be able to load its relationships

dynamic and indexer

Matthieu MEZIL — Thu, 22 Oct 2009 16:21:12 GMT

Remember one year ago, I wrote a post on how to use reflection with dynamic keyword . At this moment

re: Entity Framework Include with Func next

Ralf — Thu, 22 Oct 2009 08:50:48 GMT

Hello,

Thanks a lot for this code.

I was looking for something like that since I do not want to have strings for names sitting there too.

Now, I only have a strange problem: When I build a query and .Include it passes the data to the FuncToString routine as a ExpressionType.Convert (10) and not one of the three defined to work with.

I added another line to the case section, like this

Case ExpressionType.Convert

Return TryCast(TryCast(TryCast(selector, UnaryExpression).Operand, MemberExpression).Member, Reflection.PropertyInfo).Name (VB Syntax)

which is exactly the same as the .MemberAccess case except for another TryCase selector to UnaryExpression first.

I have no idea what I am doing there, how why what when, but it seems to work. Has anybody a hint why this change is needed, or what I was doing wrong in the first place? Why do I end up with ExpressionType Convert??

I have a second far harder question too: If you have two entities mapped m:n and the middle table of the database does not appear in your entity model (I like that...) I cannot get the function to work at all.

Any hint on that?

Thanks a lot!

Ralf

re: EDM can save your hair :-)

Evan Smith — Tue, 13 Oct 2009 07:44:23 GMT

Actually, I am pulling my hair out. How do I in the EDM Modeling tool in Visual Studio 2008, tell the entity to allow the db to let the db generate the newsequentialid?

Evan Smith

Evan@ecsweb.com

re: POO is so pretty with C#

Morshed Anwar — Fri, 09 Oct 2009 04:54:10 GMT

Sir , Can you please re-upload the your sample code. I cant download your code.thanx :).