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Start/Stop RDS Instances on Schedule

by Ivan Perevernykhata

How to start/stop RDS instances on schedule with aws-sdk, nodeJs Lambda function and CloudWatch

functionExtensions Techniques 1: Throwable Functional Interfaces

by JIANGWilliam

This is the first of three episodes to introduce considerations and techniques used for the throwable functional interfaces defined in my open-sourced library functionExtensions.

Dynamically creating a predicate delegate

by Randy Kroeger

Created a POC that dynamically builds a predicate using Expression and Reflection.

Northwind Database with NoSQL DBreeze

by Pradip Koli

Using NoSQL DBreeze database with ASP.NET on SQL Northwind Database.

Latest Articles

Working with AWS Lambda C++ Runtime as Lambda layer

by P. Erward

How to put the AWS Lambda C++ Runtime into a Lambda layer and how to use it

Five Minute Cloud Lamdba Function

by egoebelbecker

Create an AWS Lambda in five minutes

How to Access Private S3 Objects with AWS Cognito

by Necmettin Demir

To provide a URL link to access objects in private S3 bucket through AWS Cognito User Pool (using hosted UI), Authorized API Gateway and Lambda in a Secure Way.

Running PHP in Lambda on a Homebrew MVC Framework

by PaulKukiel

Build a Custom PHP MVC in 30 mins and deploy to AWS lambda

All Articles

Lambda

Start/Stop RDS Instances on Schedule

5 Jun 2017 by Ivan Perevernykhata

How to start/stop RDS instances on schedule with aws-sdk, nodeJs Lambda function and CloudWatch

functionExtensions Techniques 1: Throwable Functional Interfaces

8 May 2018 by JIANGWilliam

This is the first of three episodes to introduce considerations and techniques used for the throwable functional interfaces defined in my open-sourced library functionExtensions.

Dynamically creating a predicate delegate

29 May 2014 by Randy Kroeger

Created a POC that dynamically builds a predicate using Expression and Reflection.

Lambda query help with grouping and ordering.

16 May 2018 by Clifford Nelson

var results = owners.Where(b => b.Cars != null) .GroupBy(o => o.Gender, o => o.Cars, (key, g) => new Result { Gender = key, Name = g.SelectMany(cars => cars) .Select(car => car.Name).Distinct().OrderBy(k => k).ToList() }); I forgot the...

Northwind Database with NoSQL DBreeze

22 Jul 2014 by Pradip Koli

Using NoSQL DBreeze database with ASP.NET on SQL Northwind Database.

Data Cache Synchronization using AWS SNS and Lambda

29 Dec 2015 by Peter Carrasco

This article describes a pub-sub model using AWS Lamdba along with SNS to keep your AWS-hosted RDMB system of record and cache in sync.

Write equivalent to the above codes in linq&lambda

11 Dec 2016 by Jon McKee

var query = from row in table where row.IdUnit == 10 && row.IdSection == 5 group row by row.IdSystem into rowGroup let count = rowGroup.Count() orderby count descending select new { IdSystem = rowGroup.Key, Count = count...

How to Easily Create Telegram Bot using C#

23 May 2021 by Uladzislau Baryshchyk

A walkthrough and source code for creating telegram bot using C# and deploying it on AWS

Weird compiler behaviour...?

23 Dec 2012 by Mehdi Gholam

Posted from the comment:Check if the "optimize code" is set in your project.

Collectors Part 1 – Reductions and Short-Circuiting Operations‏

14 Aug 2014 by TheCannyCoder

Reductions and Short-Circuiting Operations

How to convert Sql server Query in Lambda expression

6 Dec 2014 by Joezer BH

You may use Linq2Sql's DataContext.GetCommandDbCommand dc = db.GetCommand(TheQeury);Check out the msdn article on the method[^][added]ORSee linqpad[^] (as suggested by Eliyahu in the thread above, I am not sure what the "lightweight" free version includes...

SQL-Server-2008R2

How do I convert list object into pivot

4 Jul 2015 by FranzBe

void Main(){ List objItems = getSampleData(); // for linqpad objItems.Dump(); var result = objItems.GroupBy(x => new { x.Project, x.State }) .Select(g => { var a = g.ToList(); return ...

Mapping expressions Expression<Func<UserVM, object>> to Expression<Func<UserVM, object>>

18 Jan 2016 by Sascha Lefèvre

I don't know if it can be done with AutoMapper. But this is how you could do it yourself, not including the Repository-call. There's a generic and non-generic version of the mapping-method; I think you should be able to use the generic one.using System;using...

entity-framework

Linq query to return top two results when there is some conflict, is not working?

27 Nov 2016 by Wendelius

First of all, this is a very well formulated question with example data, nicely done!One quite simple way could be to use two separate queries, one for fetching top salaries and the second one for employees, for examplevar topSal = from x in Employees group x by x.Salary into...

C# linq to group to a list if a condition meets else do not group

1 Sep 2017 by Graeme_Grant

Something like... var resultantList = sigList .Where(x => !string.IsNullOrEmpty(x.SignalGroup)) .GroupBy(s => s.SignalGroup) .Select(grp => grp.ToList());

How do I have optional XML elements using LINQ lamda syntax?

12 Jul 2019 by Richard Deeming

As discussed in the comments, the code you've shown is correct, and the bug has now disappeared. Demo: Optional Xml | C# Online Compiler | .NET Fiddle[^]

How to use lambda expression in C#?

7 Oct 2019 by Maciej Los

Sorry, your question is unclear and/or your database is wrongly designed, because schoold.id and class.id can NOT be equal! A database model should looks like: 1 School => ∞ YearBooks 1 YearBook => ∞ Classes 1 Class => ∞ Students So, you need at least 4 objects (tables): 1. Yearbooks table - ...

How to write lambda linq query in C#?

11 Jan 2020 by Maciej Los

This should've done the trick: var result = table2.Where(second=>second.columnf == 0 && table1.Any(first=>first.columnb == 4 && first.columna == second.columna)) .ToList();

How to group by having lambda expression in C#?

28 May 2020 by Maciej Los

Try: var result = Myentity.Person .Where(x=>x.per==123) .GroupBy(x=>new {x.a, x.b}) .Select(grp=> grp.OrderByDescending(x=> x.d).First()) .ToList();

entity-framework

How to join three table lambda expression in C#?

2 Jun 2020 by Maciej Los

Start here: Perform inner joins (LINQ in C#) | Microsoft Docs[^] Perform left outer joins (LINQ in C#) | Microsoft Docs[^] When you get stuck, come back here, provide your code, describe your issue and wait for response.

Mocking Expressions

8 Aug 2020 by Vlad Neculai Vizitiu

Mocking/stubbing lambda expressions to have a bit more control over our unit tests

Another Alternative to Lambda Move Capture

31 Dec 2012 by John Bandela

This post discusses another alternative to lambda move capture.

C++11 lambda as default param for template's functor type

1 May 2013 by jsolutions_uk

I'm not sure it is possible with lambdas, it's looking rather like a polymorphic lambda. check here[^]. I just don't think lambdas were intended to be used in the context of template based generic programming.The closest I have managed to get to implementing what you have above is...

select a single value from a list through lambda expression

14 Jan 2018 by maheshbisht

I have a list of class public class PrintUTAccural { public string PropertyName { get; set; } public string VendorName { get; set; } public string VendorNumber { get; set; } public string InvoiceNumber { get; set; } public...

Lambda expressions with List in C#

16 Jul 2013 by Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

Here x * y indicates that the elements will be aggregated by multiplication.Refer - C# Aggregate[^].See the examples and their outputs. You will be clear.Quote: int[] array = { 1, 2, 3, 4, 5 }; int result = array.Aggregate((a, b) => b + a); // 1 + 2 = 3 // 3 + 3 = 6 // 6...

Lambda expressions with List in C#

16 Jul 2013 by OriginalGriff

A lambda is pretty much just a method without a name. The (x,y) part before the => specifies the parameters and the x * y part after it is the body of the function.In this case, what you are doing is the equivalent of: List lst = new List { 1, 2, 3, 4 }; int...

[Concept] Delegate,Lamda Expression c# windows form

30 Nov 2013 by Karthik_Mahalingam

Try these linkmight be useful for you.C# Delegates, Anonymous Methods, and Lambda Expressions – O My![^]this link contians basics of lambda very informative...

Ranges and Looping with IntStream

2 Jul 2014 by TheCannyCoder

Ranges and looping with IntStream

Query an OData api: filter within a amany to many relationship

3 Nov 2014 by Jeroen E

I figured it out after I came across this link http://stackoverflow.com/questions/2247051/how-to-use-selectmany-with-dataservicequery[^]I turned the query around by first querying and filtering the recruiters and then the addresses.The query ended up like this:var addressesQuerry =...

How to convert Sql server Query in Lambda expression

11 Dec 2014 by mukesh mourya

var result = dm.Challan_Totals .Join(dm.Challans, ct => ct.Challan_No, c => c.Challan_No, (ct, c) => new {...

SQL-Server-2008R2

Lambda expressions issue. Is this syntax correct?

21 Mar 2016 by v7777

Select() method works as projection. So it always will return class with properties.so your lambda expression should look like by that wayif (!string.IsNullOrWhiteSpace(utility)){ submissions = submissions .Where(s => s.SummaryBillMaster.BillingGroupFacilityCollection...

Simplify and Secure Your Node.js AWS Lambda Code - Part 2

19 Apr 2016 by Richard Hyatt

Part 2 of our series on simplifying and securing AWS Lambda code using Node.js

How to return datatable by linq & lambda

8 Aug 2016 by Karthik_Mahalingam

try thisDataTable DT = new DataTable();DT.Clear();DT.Columns.Add("نام");DT.Columns.Add("نام خانوادگی");DataTable dtNew = db.TblUsers.Where(x => x.Id != 0).Select(k => { var row = DT.NewRow(); row.ItemArray = new object[] { k.Name, k.Family }; return row; }).CopyToDataTable();

Convert code to LINQ & lambda

12 Aug 2016 by Karthik_Mahalingam

try thisvar result = YourList.GroupBy(k => k.Section).Select(grp => new { Section = grp.Key, Count = grp.Count() }).ToList();

Nested for each to convert lambda

11 Oct 2016 by Ali_100

I am in trouble, tried many times but could succeed , foreach (var tempitem in mbsRateTempList) { foreach (var Saveditem in mbsSavedRecordList) { if (tempitem.MbsSecurityId == Saveditem.MbsSecurityId && tempitem.CouponRate ==...

Linq query to return top two results when there is some conflict, is not working?

27 Nov 2016 by sunil kumar meena

I was trying simple thing, form a collection of employees I want to fetch top two maximum employees list. But remember there can be multiple employee with the same salary so I want all of them if they fall in max two salary range. below is my collection that I am using:List Employees...

How to use system.linq.dynamic to build dynamic where clause

5 Dec 2016 by Ehsan Sajjad

In dynamic linq, the string parameter passed in is just normal sql, not any lambda expressions, so your condition should be like: case "0": query += "OperatorLineId = OperatorLineId "; break;default: query += string.Format("OperatorLineId =...

Write equivalent to the above codes in linq&lambda

13 Dec 2016 by Andy Lanng

I should make you aware of apps like Linqer | SQL to LINQ converter[^] before I continue. These types of app translate sql to linq syntax.Here's what I got for lamda:var results = db.CMMS .Where(c=>c.Unit == prop1 && c.Section == prop2) .GroupBy(c=>c.Component) ...

Write equivalent to the above codes in linq&lambda

13 Dec 2016 by Richard MacCutchan

See LINQ: .NET Language Integrated Query[^] and Lambda Expressions (C# Programming Guide)[^].

Timespan could not be parsed

21 Dec 2016 by Suvendu Shekhar Giri

Try-"01:33:56:00" instead of "001:33:56:00"That extra 0 can cause the problem.Hope, it helps :)

Timespan could not be parsed

21 Dec 2016 by Peter Leow

Where and how are these "01:33:56:00","00:23:34:00" stored?Check this out TimeSpan.Parse Method (String) (System)[^], pay particular attention to the parameter format under Remarks[ws][-]{ d | [d.]hh:mm[:ss[.ff]] }[ws]

C# linq to group to a list if a condition meets else do not group

1 Sep 2017 by Andy Lanng

More like: var resultantList = sigList .Select((x,i) => new {Item=x,Index=i}) .GroupBy(a => string.IsNullOrEmpty(a.Item.SignalGroup)?a.Index.ToString():a.Item.SignalGroup) .Select(grp => grp.Select(a=>a.Item).ToList()); Let me break it down: You want to have each empty string in...

C# - LEFT OUTER JOIN using lambda expression throws “object reference not set to an instance of an object”

20 Oct 2018 by OriginalGriff

This is one of the most common problems we get asked, and it's also the one we are least equipped to answer, but you are most equipped to answer yourself. Let me just explain what the error means: You have tried to use a variable, property, or a method return value but it contains null - which...

How to use operators(if else) in lambda expression

4 Mar 2019 by #realJSOP

I would do it this way: CurrentFinancialMovementData movementData = null; { CurrentFinancialMovementData movement1 = keys.OrderByDescending(s => s.LatestReserveDate) .ThenByDescending(x => x.ReserveDaySequence) ...

How do I perform a query with a list in C#

7 May 2019 by BillWoodruff

To me this kind of code ... that will obviously not compile ... indicates you have not really studied the basics of using the powerful tools that Linq provides. Don't worry, though: everyone I know has gone through a learning curve to get somewhat fluent in using Linq :) Well, okay, imho,...

entity-framework

How to where condition in lambda expression in C#?

3 Sep 2019 by OriginalGriff

Try: var selected = studentsCollection.Where(s => s.ID == 3); or Student justTheOne = studentsCollection.Where(s => s.ID == 3).FirstOrDefault();

How to lambda expression two table select in C#?

17 Dec 2019 by Richard Deeming

The Where condition can only use properties from the projection it operates on. Move the Where before the Select (and fix the other syntax errors) and it will work. var tableA = MyStudentEntities.Where(x => x.ColumnD == 1).Select(x => new { x.ColumnA, x.ColumnB, x.ColumnC });

entity-framework

How do I write a value that holds a string with lambda in C#?

8 Jan 2020 by Maciej Los

Seems you want to create a where statement dynamically. So, please read this: How to use expression trees to build dynamic queries (C#) | Microsoft Docs[^] Here[^], you you'll find quite simple example.

Sending Data to Kinesis Firehose Using Python

7 Mar 2020 by James A. Brannan

In this tutorial, you create a simple Python client that sends records to an AWS Kinesis Firehose stream.

How to restrict few linq features/ lampda query for my C# collection

29 Mar 2020 by Maciej Los

Seems, you don't understand what OriginalGriff has already told you... So, i'll try to show you an example. Imagine, you have a Person class: public class Person { private string personname = string.Empty; private DateTime dob = new...

How to group by having lambda expression in C#?

27 May 2020 by Richard MacCutchan

Lambda expressions - C# Programming Guide | Microsoft Docs[^]

entity-framework

Running PHP in Lambda on a Homebrew MVC Framework

14 Jun 2021 by PaulKukiel

Build a Custom PHP MVC in 30 mins and deploy to AWS lambda

How to handle optional condition / null in single statement of lambda expression

24 Jun 2021 by Richard Deeming

Trying to push the condition to the database query will result in poor performance. Instead, only add the condition if it is required: var deleteItems = _EFContext.DbTable.Where(so => so.Identifier == ProviderIdentifier); if...

Deploy a Typescript Lambda Function with AWS CDK and a Deno Layer

24 Nov 2020 by PaulKukiel

How to build and deploy a Typescript lambda function with AWS CDK and Deno layer

Expand string CAML queries via lambda expressions with Camlex.Net

4 Dec 2012 by sadomovalex

Shows how using reverse engineering feature developers may add new conditions into string CAML queries using lambda expressions.

Weird compiler behaviour...?

23 Dec 2012 by Sander Rossel

So I'm having a very weird problem... I'm working on a project which does some Reflection stuff. One of the things it does is read the name of methods. I've got code that, in essence, looks like the following.Public Class Form1 Private Sub Form1_Load(sender As System.Object, e As...

Nested Linq in MVC4 Razor

6 Jan 2013 by dartfrog

Hi all, currently i'm facing the problem with nested linq.here is my tables and now i am developing MVC4 Razor web application.student student_id,studentname,descriptionbook book_id,student_id,bookname,checkitoutbooker bookerid,book_id,bookername,bookerdescriptioni create...

Nested Linq in MVC4 Razor

6 Jan 2013 by Christian Graus

You need to do a three way join, you can't put LINQ code inside the new block, that needs to just be a constructor for your object.

A problem of access member function in lamda expression

9 Jan 2013 by Jochen Arndt

When using similar names in different scopes, at least one must be prefixed. Because you are implementing code inside class declarations, you must use this here. Imagine that the code is inline and the code block is copied as-is to the location where the function is called before compilation...

A problem of access member function in lamda expression

10 Jan 2013 by H.Brydon

You might be running into problems with access. The first line of your class isclass CMyWnd : CDialog {and it should probably beclass CMyWnd : public CDialog {

C++11 lambda as default param for template's functor type

30 Apr 2013 by User 583852

I want to do something like thistemplate T& {val++; return val;} >class RangeAllocator...where IncrementorT is a user replaceable functor that RangeAllocator will use to increment values. I know I can do it using a struct but I'm...

C++11 lambda as default param for template's functor type

1 May 2013 by Stefan_Lang

I know you can use functions as template parameters[^]. I suppose it could work with lambdas, but I have not tried myself.

How many lines of code recommended in a Linq/Lambda expression?

13 May 2013 by Mohammed Hameed

Ideally, how many lines of code (max) should be written in a Linq/Lambda expression?Thanks!

select a single value from a list through lambda expression

22 May 2013 by vibhu12345

string VenderNumber = UtAccuralLstForComp.Where(x => x.VendorName == Name).SingleOrDefault().VendorName

Lambda expressions with List in C#

16 Jul 2013 by Chaitanya Pai

Please consider this example, List lst = new List { 1, 2, 3, 4 }; int result = lst.Aggregate((x, y) => x * y);As per the articles (x,y) specifies input parameters and x*y as implementation, my doubt is, aggregate() is the method of list, then it has to have inner...

Lambda Iterational Filtering

27 Nov 2013 by Trapper-Hell

Dear all,I am using lambda expressions in C# in order to filter within a database entity. The table I am accessing is using a hierarchical tree structure and a particular entity can have infinite levels of children, which can be accessed by .Children, for example:string name =...

Lambda Iterational Filtering

28 Nov 2013 by Trapper-Hell

I have finally solved by starting from the leaf and work myself up to the parents in order using query joins, such as:query = query.Join(subquery, c => c.ParentId, p => p.Id, (c, p) => p);Thank you anyway.

lambda expression in entity framwork

19 Dec 2013 by Prutal

iam using entity framwork i need to get a user friends the diagram are in the picturethis is the diagram of the tablesInt64 userID =1;ctx.Users.Where(x => x.FriendShips.All(y => y.Accepted == true && y.CreatorID == userID)).ToList();

entity-framework

lambda expression in entity framwork

19 Dec 2013 by bowlturner

Well it might help to know what results you are expecting and what you are actually getting.currently what you have herey => y.Accepted == true && y.CreatorID == userID)will only get the friendships in one direction. meaning if someone else created the friend request and your user...

entity-framework

Getting values from ObjectConext

9 Jun 2014 by Prasaad SJ

I m using EntityFramework to get the data from the DB. consider I have a tableBuyer{ guid id, datetime date, guid userid references user(id)}user{ guid id, string name}consider the above class as table in DB.I want to return user name in buyer list....

entity-framework

Getting values from ObjectConext

10 Jun 2014 by goathik

I had the same problems concerning the use of includes slowing down my linq performance.To solve that problem I had use "select new" on linq to manually populate the properties I needed (User.Name, on your case) into a partial class having the same name (Buyer) and namespace of the class in...

entity-framework

insert a new record by language lambda in web form

10 Sep 2014 by misaqyrn9677

hii want insert a new record by language lambda in web form my data base is sql server 2012 and use in asp.net c#(web) please help me

SQL-Server-2012

How Do I Create A Call An Object's Property Which Is Of Delegate Type Using Expression

14 Sep 2014 by Simba Mukodzani

I have a piece of code like the following....Delegate Function CreateObject(Of I)(Object context) As IClass Container Property ReadOnly ObjectType() As TypeEnd ClassClass Container(of I) Inherits Container Property ReadOnly Creator() As CreateObject(Of I)End...

Dynamically generated lambda giving different result than regular lambda

16 Oct 2014 by GateKeeper22

I am have a problem with Dynamically generated compared to a regular lambda expression in code. Below is the code that I use to generate a dynamic lambda.Dynamic Lambdavar parameterExp = Expression.Parameter(typeof(T), "x");var propertyExp = Expression.Property(parameterExp,...

How do I repeat phrases when loading data from the database don't show to drop down list

1 Nov 2014 by Member 11180545

helloHow do I repeat phrases when loading data from the database don't show to control of drop down listplz help memy code is var JensKakhat = db.ItemProducts.Where(c => c.ForProductId == DdlProduct.SelectedValue.ToString()).ToList();int count3 = JensKakhat.Count();if (count3

SQL-Server-2012

How do I repeat phrases when loading data from the database don't show to drop down list

1 Nov 2014 by DamithSL

var result = JensKakhat.GroupBy(g => g.Id) .Select(g => g.First()) .ToList();PnlTypePaper.Visible = result.Any(); DdlTypePaper.DataSource = result;DdlTypePaper.DataTextField = "ItemNine";DdlTypePaper.DataValueField =...

SQL-Server-2012

i get error in my Linq Lambda Expression please guide Me to solve it.

13 Dec 2014 by mukesh mourya

DataClasses1DataContext dm= new DataClasses1DataContext();foreach (var cln in SelectedList) { var result = dm.Challan_Totals.Where(x => x.Challan_No == cln) .Join(dm.Challans, ct =>...

An exception of type 'System.ArgumentException' occurred in EntityFramework.dll but was not handled in user code

26 Jan 2015 by Abhinav S

You can debug and check exactly where the error occurred and what caused it.That would be the easiest way to find the error.

entity-framework

Proper Lambda expression for a many to many relationship?

29 Jan 2015 by Member 11413084

I have two tables (TestSets and TestSetMembers) with a many to many relationship defined in an Entity Framework. In other words, one TestSet can have one or more TestSetMembers belonging to it. And one TestSetMember can belong to one or more TestSets.I can not understand why the...

entity-framework

Proper Lambda expression for a many to many relationship?

29 Jan 2015 by Dave Kreskowiak

You seem to not know what the All extension method does.It tests every element in an IEnumerable to see if they all pass the specified test. If they all do, then the return value is true. If not, then false.Since I doubt every element in your set .Contains(ts), the result of the LINQ...

entity-framework

How to write following query in Lambda expression or by using entity framework?

8 Apr 2015 by Maciej Los

First of all, please read my comment to the question.Here is an idea:101 LINQ Samples[^]How to: Group Query Results (C# Programming Guide)[^]How to Use LINQ GroupBy[^]

How Can I convert Subquery Sql to lambda expression?

13 Apr 2015 by bkashani

Hello I have this sql command Could you help me How can I write this with lambda expression?Select A.*from Tablename A inner join (select address,state from Tablename group by address,state having...

How Can I convert Subquery Sql to lambda expression?

13 Apr 2015 by Maciej Los

Try this:var qry = TableA.AsEnumerable() .GroupBy(a=>new{a.address, a.state}) .Where(grp.Count()>1) .Select(d=>new{address=d.Key.address, state=d.Key.state});

Ho I can return a list of recordes using LINQ ?

2 May 2015 by fahd951

Hi there,First thank you to visit my post ..I just start my way with Linq so I'm sorry if it's stupid question :(I have this ERD design ..http://www.m5zn.com/newuploads/2015/05/02/jpg//6fe7a5567905df0.jpg[^]also I wrote this...

How to display multiple records using linq

28 May 2015 by Member 11581003

I have a table that stores Referral details - it includes fields like Referral Type, Referral Date, OffenderID, OfficerID etc.) And obviously some Offenders are referred more than once (multiple times) and likewise, OfficerID also repeats in the table as many offenders are referred by the same...

How to display multiple records using linq

28 May 2015 by Sascha Lefèvre

To give you a fully working query I would have to know how your Offender- and Officer-Tables/Entities look like. So I'll make a good guess here instead and to illustrate I include all the code I wrote to test it. You obviously can discard everything except the query at the bottom. I assume...

How do I convert list object into pivot

4 Jul 2015 by deepakdynamite

I have list of information with following fields:Project State Title ABC Resolved Title1 ABC Pending Title2 DEF Archived Title3 DEF Resolved Title4 DEF Committed Title5 DEF Active Title6I want...

how to convert array of List array to single string array ?

9 Aug 2015 by Mehdi Gholam

Start here : http://www.c-sharpcorner.com/UploadFile/0f68f2/programmatically-binding-datasource-to-combobox-in-multiple/[^]

LINQ (with Lambda) usage in nested collections

20 Aug 2015 by NJ44

Hi All,I need your help in writing a linq query (with lambda expressions) for the following scenario.AIM: I am receiving a response from a web API, which is in the following structure: Response contains 4 levels of nesting(of collections): WebAPIResponse:CycleSummary(n) ->...

LINQ (with Lambda) usage in nested collections

20 Aug 2015 by DamithSL

try as below IOPCallTypeModel[] iOPBillingPeriods =cycleSummaries.Select(x=> new IOPCallTypeModel(){ StartDate =//create and set VoiceZone.StartDate from x.StartDate, // do the same for rest of the properties... }).ToArray();

How to convert Ienumerable() to string?

13 Nov 2015 by Maniraj.M

Hi all,i having a code like this and iam binding that string value to dropdownlist. string test = ds.Tables[0].AsEnumerable().Where(x => x.Field("Id") == lbl.Text).Select(z => z.Field("Description")).ToString();Drpdwn.Items.Add(test);but when execution it binds like this, ...

How to convert Ienumerable() to string?

11 Nov 2015 by Krunal Rohit

Loops through the collection and add it to the dropdown items.var items = ds.Tables[0].AsEnumerable().Where(x => x.Field("Id") == lbl.Text).Select(z => z.Field("Description")).ToList();foreach(var i in items){ Drpdwn.Items.Add(i.ToString());}-KR

Mapping expressions Expression<Func<UserVM, object>> to Expression<Func<UserVM, object>>

17 Jan 2016 by vacho2

I would like to propagate entity framework include properties across architecture.1. Starting at the service layer where these include properties come as an argumentIEnumerable GetUsers(user => user.Classes);2. The method getUsers must translate this expressions from ViewModel to...

entity-framework

Lambda expressions issue. Is this syntax correct?

21 Mar 2016 by Cyrus_Vivek

Hi,I am not sure if my expression is correctly. Correct me if anything syntax is wrong. This has to filter by PipelineName = Utility (This following code is not filtering by utility)I am expecting it should pull only for those utility we are passing as a parameter.I can understand it...

Linq query with lamba expression

16 Aug 2016 by super_user

I create sql query now i try to convert this in linq with lamda expressionselect Catg_type.Catg_type,Program_type.Prog_name ,Year_info.year,COUNT(Std_info.catg_id) as total_students from Std_info inner join Catg_type on Std_info.Catg_id=Catg_type.Catg_idINNER join Program_type on...

Azure functions with service bus trigger not working with REST API

16 Jun 2017 by komakommander

Hi everyone,i am banging my head on the following task:I have an AzureFunction that uses a ServiceBus-Trigger like so:{ "bindings": [ { "name": "myQueueItem", "type": "serviceBusTrigger", "direction": "in", "connection": "MyConnection", ...

How do I write the query in linq

15 Jul 2016 by Troy Bryant

Hi -I'm looking to rewrite this query in linq and literally have no idea. In my application I have strongly typed view models so dont know if using annomous types as a few of the articles have stated.Here is the sql : select...

How do I write the query in linq

15 Jul 2016 by Vignesh Mani

var queryNestedGroups = from student in students group student by student.Year into newGroup1 from newGroup2 in (from student in newGroup1 group student by student.LastName) group newGroup2 by newGroup1.Key;

How to filter column from dataset using lambda expression?

2 Aug 2016 by Maniraj.M

Hi all, This is my function i want select particular column from dataset using lambda expression and add into var temp to return that.I am not getting string format but i am getting object format as System.Collections.Generic.List`1[System.String].Why this is happening?Is my approach...