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Linq dynamic query library 2012
In addition using the dynamic SQL string approach is likely the most efficient since there's no query parsing involved just raw SQL.
The cool thing with this method is that it dynamic works against any type - entities or otherwise.
That's easy enough - for the designer.This looks messy but remember in my situation this goes into the base business object and then never used again directly.With Query syntax, it may look like this: With Method library chaining it may look like this: These two queries look very similar and they will do exactly the same thing.Type Safe Dynamic Sorting, it is common to display a grid of data to a user and allow the user to sort it any way that they want.Where method on the files object the second time we have lost what happened linq to the first call.The code is now generic in that that the business object can apply any type for a Pk (string, dynamic int, guid for example) and still use the simple Load(pk) syntax.Here we will focus our attention on three static methods: Equal(Expression, Expression) LessThanOrEqual(Expression, Expression) GreaterThanOrEqual(Expression, Expression) The other methods available will follow the same pattern of taking two expressions, a Left Expression, a Right Expression, and the method itself defining the binary operator.Choices, Choices, Choices Which choice works best depends on your scenarios.This is personal preference, but I believe that IntelliSense kicks in quicker with Method chaining.Other Posts you might library also like.Expression Trees may seem a little intimidating at first, but dont worry, the expression that we need to build up is very simple, we need to build a property reference expression.With the expression set the Load method on the base business object can now be rewritten like this: public TEntity Load(object Pk) Table TEntity table tTable( typeof(TEntity) ) as Table TEntity return ngleOrDefault(ent FieldExpression Pk And dynamic we're now back to being able to call the.In general, using a lambda expression. ExecuteQuery method and still get an IQueryable T back as a result.
So I give props to forgotten both names.Use stored Lambda Expressions, skip linq and use SQL strings with ExecuteQuery T The sands easiest way - even if very unlinq like - is to game use SQL strings.If you wanted to add additional criteria, you could simply add them to the crack Where section.It also has linq the name of the property hard coded in the logic.Thanks linq to Richard Deeming for pointing out this issue and posting the Expression syntax.Foreach(var criterionPair in xmlCriteria) var value lue; result sands result. As soon as fedora I remove the Dynamic.
Now that we have all of the logic in place, we simply need to convert it to a lambda expression and compile.
Next we specify the only thing that we are going to do in this function, reference a property.
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