Entity Framework 6 - Knowledge Base (KB)
22 results in tag: dynamic-linq
LINQ Dynamic Group Using Several Columns
I need to translate the following LINQ query to Dynamic LINQ that accepts several grouping columns based on user input. Basically I have a bunch of dropdownlists that apply groupings and I don't want to enumerate every combination of groupings. If Dynamic...
asked by Daniel Coffman
Using the OrElse and AndAlso expression methods, throw an exception.
I am trying to build an expression tree programmatically....I have in my input, a list of condition classes which have the following form:...public class Filter { public string field { get; set; } public string operator { get; set; } public st...
asked by Lorenzo
DbSet<T>.Include() causes SELECT N+1 when used in extension method
I have an extension on IQueryable that allows passing in delimited string of property names which, when used causes query not to construct JOINs and effectively causes SELECT N+1 issue....What I noticed is that if I call native EF extension .Include("prop...
asked by zam6ak
Dynamic LINQ DateTime Comparison String Building - Linq To Entities
I'm using the dynamic LINQ library by Scott Guthrie together with Entity Framework and C#....I have to build my where string into a variable based on several factors and then pass the string variable to the where clause. For some reason, this will work:..
asked by Ricketts
How to execute a LINQ to Entities query, pulling values from an existing resultset variable instead of against the DB
To provide some context, I'm using jqGrid to conduct a server side search on a datetime field, truncating the time portion server side, and then fetching results via a stored procedure. This is being done using System.Dynamic.Linq, which I've modified sli...
asked by RizJa
Dynamic Linq and use of Between
I am having a Dynamic Linq where It should perform comparison between two integers. I tried so many but none of them worked for me....Code...db.Bibs.Where(" Id >= 1 && Id<1000 ") db.Bibs.Where(" Id between 1 && 1000 ") ...How to form this string to make...
asked by DonMax
Using Dynamic LINQ Where in a one-to-many Entity Framework relationship
I am using EF 6 and .net 4.5. I have a "Documents" table with the PK "DocumentId" (Int) and another column, "Title". I have another table called "DocumentFilters" with the columns "DocumentId" (Int) and "DocGUID" (Guid). There is a FK on "Doc Id" between...
asked by Lenny K
EF6 IQueryable dynamic linq Where(predicate, values) with DbFunctions.TruncateTime
In my simplified example i have an object with following properties:...Name (string)...BirthDateTimeStamp (datetime)...I need to ba able to build dynamic queries in the following way...var predicate = "Name = @0"; var values = new object[]{"Ed"}; myIQuery...
asked by JMan
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...
asked by ssmsexe
how to order by a dynamic column name in EntityFramework?
I am trying to get following code working , This was working fine for MSSQL , but since i changed to use mySql it is not working... records.Content = db.areas .Where(x => x.Name.Contains(filter))) .Orde...
asked by Kas
How to fix 'No property or field exists in type' error?
I got this error when trying to sort any columns that are not in the Order table, if I use ...OrderBy("Customer.CompanyName" + " " + sortDir)... the error will gone but all the columns will become unable to sort. The ...OrderBy... method used below come f...
asked by Phantom
Dynamic Linq + Entity Framework: datetime modifications for dynamic select
I am trying to find a way to move UTC time to Local before doing a sql grouping. I am using the System.Linq.Dynamic (managed here ...https://github.com/kahanu/System.Linq.Dynamic... ). It works great for doing dynamic selects without having at compile ti...
asked by TravisWhidden
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...
asked by TravisWhidden
Dynamic LINQ - Entity Framework 6 - Update Records for Dynamic Select
C# rookie. Below is my code, been trying for hours now to get this to update some fields in my DB and tried many different implementations without luck.... // Select all fields to update using (var db = new Entities()) { ...
asked by user3333134
System.Linq.Dynamic: How to declare an array for .Contains?
I am trying to do a simple SQL ...where field in (2,3,4)... with Dynamic Linq. kahanu's rehosted ...Microsoft Dynamic Linq Library... has a ....Contains()... that you can use in Linq like this:...var results = myTable.Where("@0.Contains(outerIt.abc)", new...
asked by Zachary Scott
Using Dynamic Linq to Filter entity by datetimeoffset columns
I am doing a dynamic linq using the DynamicLinq dll where-in I am sending the dynamic filter constructed like the one below..."CreatedDate=System.DateTimeOffset.Parse(\"2017-11-17 22:07:04.9192538 +00:00\")", ...However, i am getting an error that System ...
asked by Saran
Dynamic LINQ with ICollection.Any()
How can I use Dynamic LINQ on navigation properties that are collections?...For example, if I want all the orders with certain no. I could do something like:...var searchTerm = "123456"; var query = context.Orders.Where(o => o.ErpOrderNo.Contains(searchTe...
asked by Adanay MartÃn
Dynamic Projection in linq with List of fieldNames
I wanna do projection on fields of my collection and nested collection in each of entity, I use EntityFramework 6.2 I've do that with dynamic query like bellow code...Students.Select("new (Name,Family,new(Category.Name) as Category)"); ...it was worked b...
asked by Masoud Mirzaei
How to get first day of month/year etc?
I'm using ...Linq.Dynamic... to query a ...SQL Server... database....I have a date field named 'EnteredOn' which I need to convert to first second of that month (or year, minute etc)...I tried basically everything, but everything throws an error...Here ar...
asked by Yisroel M. Olewski
EF Core "InvalidOperationException: Include has been used on non entity queryable" for navigation property even after explicit include
I've created a sample project which uses the following packages - ...GraphQL...GraphQL.EntityFramework...System.Linq.Dynamic.Core...The idea here is to translate the selection done in the GraphQL query and pass that onto EntityFramework in order not to ov...
asked by Soham Dasgupta
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