Entity Framework 5.0 Generic Repository classes for CRUD operation with complex LINQ expression. Microsoft Visual Studio Test Tools Unit Testing - CodeProject
In both we would be having same kind of methods like Add, Update, Delete, FindAll, FindById and SearchByparam with overloaded methods for Add and Delete etc. Here we would be having two different generic classes one for simple customer type of entities and other for complex entities like customer Model class
LINQ Introduction Part 1 Of 3 - CodeProject
It then enumerates the source sequence, repeatedly computing the next accumulator value by invoking the specified function with the current accumulator value as the first argument and the current sequence element as the second argument. Also if we had some complicated nested, joined, aggregate (SUM, COUNT) type operators as part of the query, it might be quite a complex type that we have to declare as a return type
What sort of impact will this have on the use of obfuscators such as DotFuscator? Will we need to exclude all ORM classes from obfuscation? Clayton Powell - Monday, August 27, 2007 11:45:43 PM I was wondering if you could give some advice on some practical aspects for building a good business logic layer. At the very basic, while working on a multi tier application you fetch the data and pass it on to front end (In this process we lose the datacontext and associated tracking)
-Fahad Fahad - Tuesday, April 22, 2008 10:14:20 AM Not sure, why you need it, i am curious to know what is your objective that can not be accomplished with existing solution. Hope this helps, mehfuzh - Friday, February 15, 2008 7:32:06 PM Hi Mehfuz, Is there any way to generate expression for LINQ on objects??, my app is full of objects which i would process it thru reflection, the LINQ to SQL works like a charm for me, but i would also like to add this feature in my app with LINQ on objects
Given this code, the library function calls (like Where and Select in case of LINQ) can consume that expression tree to analyze the code the user wrote, extracting the intent and turning it into execution in whatever way is right for the task at hand (e.g. Typical sample is the use of expression trees in LINQ where nonsense queries can be written, in a sense they cannot be remoted to the target query language
DOT NET TRICKS: Use of Expression Trees in .NET for Lambda Decomposition
To learn more about LINQ please have a quick pick on my article on LINQ and Lambda Expressions.But if you have already read about the basics of LINQ, it is not all that is needed. The Expression is the main class that holds any expression in it and it lets us to divide the whole body of the Expression into smaller individual units
example....I have seen this solution before, but, in the first place, how was Int...but data grid view i can.t add rows and i can.t edit in any cells? ...This broke down when I tried to use it in multiple places
The query has an arbitrary 'where' clause, passed in as a parameter, orders the selected cities descending by population, and selects the first 'numDesired'. By the end of this post, you'll understand why! So how do we come up with an Expression for our 'where' parameter? The easiest way is to assign it from an Expression Lambda
If you have not read the previous posts you probably have a life beyond the keyboard, but if you don't then follow the link below to find oodles more to help fill your meaningless existence. This is an expression evaluated against the server's state and can be used to implement optimistic concurrency by basically checking to see if the server's state is still the same as you remembered it
IQueryable Vs. IEnumerable in terms of LINQ to SQL queries
i.e Extension methods defined for IQueryable take Expression objects instead of Func objects (which is what IEnumerable uses)., meaning the delegate it receives is an expression tree instead of a method to invoke. When I explore further I fond following difference between both ? The major difference is that IEnumerable will enumerate all elements, while IQueryable will enumerate elements, or even do other things, based on a query
Because each outer IQueryable is reaching into the expression exposed by the inner IQueryable, it's only the outermost one -- Count in our example -- that causes the execution (foreach would also do it, as would ToList() or ToArray()). The way it works is that we stack one IQueryable implementation onto another, in our case Count works on the Where which works on the ObjectSet returned from the Posts property on the object context (ObjectSet itself is an IQueryable)
The provider is going to basically do two things; 1) translate the query into a SQL command text and 2) translate the result of executing the command into objects
When and why would you use this? From the LINQ expressions I've seen that have them, they just seem to wrap existing expressions without adding any value
Duncan Ady Admin 565 posts Posted 13 Sep 2011 Link to this post Hello Duncan, It seems that like u.UserGroups is a single object and the from clause expects a sequence of objects
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