Dynamic LINQ - Knowledge Base (KB)
24 results in tag: lambda
lambdas expressions generated dynamically + linq + OrderByDescending
how can I create a dynamic lambda expression to pass to use in my orderby function inside linq?...I basically want transform ...queryResults.OrderByDescending();... in ...queryResults.OrderByDescending(myCustomGeneratedLambdaExp);... where ...myCustomGene...
asked by byte_slave
LINQ Querying an Entity with Dynamic Field Names
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 ...
asked by Scott Lance
Linq: Dynamic Query Construction: the query is constructed on the client side.
I've been following with great interest the converstaion here:...Construct Query with Linq rather than SQL strings...with regards to constructing expression trees where even the table name is dynamic....Toward that end, I've created a Extension method, ad...
asked by donundeen
Using unknown types in DynamicExpression
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...
asked by sean
How can I write an OrderBy Specification using the Dynamic Expression API?
I figured out how to do a predicate from a string supplied by a client based on ...Dynamic Linq... (this is wrapped in a Specification object):...return System.Linq.Dynamic.DynamicExpression.ParseLambda<TE, bool> (filter.ToString(), arguments.ToAr...
asked by Zachary Scott
"Contains" lambda expression
I use a dynamic filter, that filters a collection using object properties, operators and values. Now, if the property is a string, the operator is "contains" and the value is "word", the filtered objects containing the "world" should be filtered according...
asked by serhio
Interval grouping using dynamic linq (DateTime, Numeric)
I search everywhere and didn`t find anwser for this question. I want to group by intervals (DateTime, Numeric) in Dynamic linq (the data will be crated dynamically so i must use dynamic linq)...Lets assume that we have such data:...ID|Date|Price 1|2010-1...
asked by WebDeveloper
Perform a query on an object having members of type "dynamic" using Dynamic Linq.
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...
asked by Darsegura
In C#, how do you make a dynamic lambda-based Linq expression from a string?
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...
asked by jon333
dynamic linq expression using select in .NET
I want to dynamically add .Select statements, but the compiler will only allow me to build these statements inside the current scope. I am aware of linqkit, which could be a solution, but i dont want to add any external functionallity. How do i avoid this...
asked by Zeezer
How to create a property (collection) expression selector from a string?
I wanted to transform the string "...Employee.Orders.OrderID..." in the ...linq expression...: "...employee.Orders.Select(order => order.OrderID)..."....I already know how to do this in simple properties such as "Employee.FirstName" my question is how to ...
asked by Lukian
Dynamic expression parsing in localized environment
So I'm trying to parse a simple arithmetic dynamic expression using System.Linq.Dynamic. This runs fine when executed in an English environment where the CurrentCulture is English-US (and the decimal separator is a plain "." dot). Trying to run the code i...
asked by alrotem
How to resolve Dynamic LINQ ParseException: "Identifier Expected"
I am getting generic error message System.Linq.Dynamic.ParseException: Identifier expected....What should I check in order to resolve it? The error isn't very detailed....I did check the source and the selector params from the ParseLambda method and T-SQL...
asked by mitaka
Add second group by key field to existing Lambda Expression
I have a Group by expression that I am dynamically creating for use in a LINQ query. Currently, to construct the expression, I use the following code: ...var arg = Expression.Parameter(typeof(T), helper.getName()); var prop = Expression.Property(arg, "c...
asked by mjsalinger
Lambda Expressions and Extension methods
So I have an extension method defined like so... public static String FormatString(this String source, String formatString, Object[] parameters) { return String.Format(formatString, parameters); } ...and from investigation, I have come...
asked by Kobojunkie
Get an Entity Object with its child Entity with a condition (using Dynamic Linq)
This question is continuation of ...Getting Count() property in Dynamic Lambda Expression...I had asked if we can put Count() Method in dynamic lambda expression. I could do it using ...Dynamic Expression API.... Answer provided by - xmojmr...But recently...
asked by dPatel1582
Dynamic Lambda condition on nested array
I want to perform a Dynamic Lambda in a collection with an array of strings[] on it:...public class ClassStudentsViewModel { public string[] Disciplines { get; set; } public TeacherName { get; set; } } ...This is what I'm trying:...The ...source..
asked by DontVoteMeDown
Dynamic LINQ: Comparing Nested Data With Parent Property
I've a class with following structure:... public class BestWayContext { public Preference Preference { get; set; } public DateTime DueDate { get; set; } public List<ServiceRate> ServiceRate { get; set; } } public class ServiceRate { publi...
asked by Arun Singh
How to GroupBy a part of DateTime using System.Dynamic.LINQ library
I have tables that contain a lot of rows, each record is excellent by whom and on what date was added. I want to group all records, based on AddedBy and AddedOn fields....The problem is that the dates are in full including the miliseconds and I only want ...
asked by Haim Tabak
Dynamic LINQ query to get Field value from Database
is it possible?...Public String Get_Filed_By_Id(string table_Name,String Field_Name,string PK_val) { string strRes=""; using(mydbcontext db=new mydbcontext()) { var x=db.table_Name.Where(p=>p.Id=PK_val).FirstOrDefault().Field_Name; ...
asked by A_Sk
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