Expression Tree Tutorial - Knowledge Base (KB)

dynamic query using expression tree

I have a form in which the user will choose the following from dropdown lists:... table_name columnName_to_sort_by columnName_to_search_in ...The user shall enter ...Search_text... in a text box...The form shall draw data from many tables. I want to ...

Querying Entity with LINQ using Dyanmic Field Name

I have created a dynamic search screen in ASP.NET MVC. I retrieved the field names from the entity through reflection so that I could allow the user to choose which fields they wanted to search on instead of displaying all fields in the view....When the ...

Executing DynamicExpression with unknown types

If anyone is very familar with the Linq.Dynamic namespace I could use some help -- couldn't find any indepth resources on the internet....Basically I'm using DynamicExpression.ParseLambda to create an expression where the type is not known at compile time...

Dynamic Linq - Perform a query on an object with members of type "dynamic"

I am trying to use a dynamic linq query to retrieve an IEnumerable<T> from an object collection (Linq to Object), each of the objects in the collection have an internal collection with another set of objects where the data is stored, these values are acce...

How to create dynamic lambda based Linq expression from a string in C#?

I'm having some difficulty creating Lambda-based Linq expressions from a string. Here is my basic case using this sample object/class:...public class MockClass { public string CreateBy { get; set; } } ...Basically I need to convert a string like this...

System.Linq.Dynamic.DynamicExpression parsing expressions with methods

I need to build a system where I have a number of expressions that are stored in a file. These expressions would be read into the program, compiled into linq expressions and evaluated as functions on a number of objects. However, these expressions would c...

Creating dynamic expression for entity framework

I've created a generic expression builder that builds up a predicate based on collection of conditions. I pass the predicate to a generic method in the repository. I think that expression builder works fine and creates the desired predicate although the S...

Entity Framework + DayOfWeek

Using the ...System.Linq.Dynamic... (managed here ...https://github.com/kahanu/System.Linq.Dynamic... ), I am trying to capture the ...DayOfWeek... field found on the ...DateTime... for aggregation purposes using Entity Framework 6 (or greater)....Previou...

C# Dynamic Linq Ternary Operator

I want to make a dynamic check for a null value. I want to make a where clause which will compare only the date part of the date field....It will work for non nullable date fields, but for nullable date fields we need to check for value as using .Date on ...