Expression Tree Tutorial - Knowledge Base (KB)

How do I dynamically construct a predicate method from an expression tree?

Here's the scenario: Silverlight 4.0, DataGrid, PagedCollectionView itemssource. The objective is to apply a Filter to the PCV. The filter needs to be a ...Predicate<object>(Method)... - where Method implements some logic against the object and returns t...

How to create linq predicate with multiple nested "ands" and "ors"

I am trying to dynamically create a linq expression at runtime using PredicateBuilder from ...http://www.albahari.com/nutshell/predicatebuilder.aspx.......I currently have a method that takes a list of criteria objects, and then parses those into multiple...

Unable to refactor using LINQ to Entities and LinqKit / PredicateBuilder

I have been trying to refactor a LINQ expression into a method, and have been running into both the "...Internal .NET Framework Data Provider error 1025...." and "...The parameter 'xyz' was not bound in the specified LINQ to Entities query expression...."...

How does PredicateBuilder work

C# in a Nutshell has a free class called PredicateBuilder which constructs LINQ predicates piece by piece available ...here.... Here's an extract of the method which adds a new expression to the predicate. Could someone explain it? (I have seen ...this...

Using PredicateBuilder to build query searching across multiple columns of Entity

I have a list of field names. I am trying to build a predicate to look in the fields to see if they contain the search term. I have gone done the path listed in this ...original question... but do not understand how to do a ...Contains... instead of a ...