linq query with if else condition c#

. as someone commented but in this case it is not really necessary as you have the || && operators there anyway. LINQ In sql I use like this: Classcud2 ob1 = new Classcud2 ( "select * from tbl_usertotalrating where store_name='" + TxtCompany.Text + "'" ); if (ob1.ds.Tables [0].Rows.Count > 0 ) { // what i want } else { // what i want } but my problem is I want to use "if" "else" condition in linq, In linq : This video gives an idea on usage of If condition in LINQ through a simple scenario. In the above example, we selected the each resulted string elements. What is Mala? Has 90% of ice around Antarctica disappeared in less than a decade? . Styling contours by colour and by line thickness in QGIS, Time arrow with "current position" evolving with overlay number, Partner is not responding when their writing is needed in European project application, ERROR: CREATE MATERIALIZED VIEW WITH DATA cannot be executed from a function, Recovering from a blunder I made while emailing a professor. Is there a proper earth ground point in this switch box? "One deal" : "Many deals")), How Intuit democratizes AI development across teams through reusability. I need to ignorefilter condition if line id is 0 and empty. This is what the compiler does behind the scenes when you write queries by using query syntax. Not the answer you're looking for? To get started using LINQ, all that you really have to know about extension methods is how to bring them into scope in your application by using the correct using directives. @hanzolo any IEnumerable is also an object. The primary formula to use it is: var SubListName = from ValueHolder in List group ValueHolder by Category; The new keywords are group and by. Do you need your, CodeProject, Is that what you want? @hanzolo while it is true that any IEnumerable is also an object, it's a fairly useless fact. if (value <= 12) Acidity of alcohols and basicity of amines. And because a query variable does not store the results of the query, you can modify it or use it as the basis for a new query at any time, even after it has been executed. :) returns What sort of strategies would a medieval military use against a fantasy giant? How to show that an expression of a finite type must be one of the finitely many possible values? How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? IF ELSE condition in Linq Where clause using C# and VB.Net in ASP.Net sureshMGR on Jan 29, 2021 12:07 AM Sample_180542.zip 13435 Views Answered Hi friends, I need to reduce source code by removing below if conditions, how to filter data in same query without using if condition? We can see there is just one income between 25000 and 40000. How Intuit democratizes AI development across teams through reusability. C# if Statement The if statement contains a boolean condition followed by a single or multi-line code block to be executed. Make use of WhereIf extenstion method avaialbe in linq Example if (SearchControlMain.PostingID.HasValue) query = query.Where (q => q.PostingID == SearchControlMain.PostingID); instead of above go for the below query = query.WhereIf (SearchControlMain.CategoryID.HasValue, q => q.CategoryID == SearchControlMain.CategoryID); How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? Thanks for contributing an answer to Stack Overflow! This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). Is it suspicious or odd to stand by the gate of a GA airport watching the planes? // Still no data is yet fetched. In code, the commented part is what I need to solve Is there a way to write such query in LINQ? Why are non-Western countries siding with China in the UN? Where produces a filtered sequence, and then Orderby operates on that sequence by sorting it. For example, assigning grades (A, B, C) based on marks obtained by a student. Our LINQ statement where clause condition ask for rows where this column contains Germany. if p.conditionVariable == 0 the following remains the same. Just do it once before the start of the loop: Thanks for contributing an answer to Stack Overflow! Is a PhD visitor considered as a visiting scholar? email is in use. A. SQL injection has been a significant risk for traditional SQL queries formed by concatenating user input. In C# => is the lambda operator, which is read as "goes to". Connect and share knowledge within a single location that is structured and easy to search. Hello, yes you can use LINQ to query data in a DataGridView. Connect and share knowledge within a single location that is structured and easy to search. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2, Using LINQ to remove elements from a List. Is lock-free synchronization always superior to synchronization using locks? Linq C# If else statement. Minimising the environmental effects of my dyson brain, Time arrow with "current position" evolving with overlay number. What video game is Charlie playing in Poker Face S01E07? When to use .First and when to use .FirstOrDefault with LINQ? Operator (C# Reference) [ ^] So, what have you tried to achieve? Use an inline annonymous function instead of a single line expression so that you can use a normal if/else statement. @Tudor, I can't understand the performance problem. Although it looks as if IEnumerable has been redefined to include these additional methods, in fact this is not the case. Short story taking place on a toroidal planet or moon involving flying. Connect and share knowledge within a single location that is structured and easy to search. We have a DataGridView Column named Country. To learn more, see our tips on writing great answers. Styling contours by colour and by line thickness in QGIS, Theoretically Correct vs Practical Notation, Topological invariance of rational Pontrjagin classes for non-compact spaces, Time arrow with "current position" evolving with overlay number. Select All you need is C# This These extension methods are meant to conditionally apply LINQ clauses if a boolean is set to true. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. What is the correct way to screw wall and ceiling drywalls? Can I tell police to wait and call a lawyer when served with a search warrant? but for any clientId between 1 and 999 we want only clients with that ID. rev2023.3.3.43278. I need to reduce source code by removing below if conditions, how tofilter data in same query without using if condition? c# Php if else statement autamaticaly goes to else part. 5. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. ADO.NET, Entity Framework, LINQ to SQL, Nhibernate. 1 I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. This article shows the three ways in which you can write a LINQ query in C#: Use query syntax. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In the previous code example, note that the OrderBy method is invoked by using the dot operator on the call to Where. Acidity of alcohols and basicity of amines. Thoughts? Why should transaction_version change with removals? How to follow the signal when reading the schematic? rev2023.3.3.43278. dateTo, List<AccountRootType> accountRootTypes = null . The content must be between 30 and 50000 characters. The following example the data can be data bound or unbound. LINQ query in C# by method syntax, using the lambda operator > Next is another use of LINQ in C#, except this time the more standard syntax is used to call the LINQ API. Do new devs get fired if they can't solve a certain bug? ? s.StudentID == StudentUserID : s.TutorUserID == TutorUserID), where (ISSTUDENT == true ? one of two values depending on the :) returns one of two values depending on the value of a Boolean expression. All you need is: If clientId = 0 we want ALL employees,. Do I need a thermal expansion tank if I already have a pressure tank? This inline expression is called a lambda expression. The ValueHolder factor is the same variable created from the from operator. Is it possible to create a concave light? : is nothing but if else else if else. Let me know if you need any help with this query. I have no idea what you are asking, please clarify the question. These LINQ query operators are used to filter out elements based on the indexes or by a condition in a sequence. After you become more familiar with lambdas, you will find that they are a powerful and flexible tool in your LINQ toolbox. Not the answer you're looking for? The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. Asking for help, clarification, or responding to other answers. A limit involving the quotient of two sums. The example uses an integer array as a data source for convenience; however, the same concepts apply to other data sources also. Making statements based on opinion; back them up with references or personal experience. //queryAllCustomers is an IEnumerable<Customer> var queryAllCustomers = from cust in customers select cust; The range variable is like the iteration variable in a foreach loop except that no actual iteration . Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Any time you want to do a side-effect per element (such as logging), breaking out the lambda into a statement body makes it easy to reason about. If so then how can I do that? For more information, see Lambda Expressions. The standard query operators extend IEnumerable and that is why you can write numbers.Where(). Movie with vikings/warriors fighting an alien that looks like a wolf with tentacles. Why are trials on "Law & Order" in the New York Supreme Court? You need to understand that what's in the WEHRE clause is a boolean expression not a statement. I was having issues with seperate LINQ statements not being the same (Deleted/Clients filters need to be on all queries), so by add these two lines it works (all be it until we have 999+ clients - which would be a happy re-factor day!! Edit: You can make combinations like this: In this case your are using deals.Count() a lot, so you can store the result in a temporary variable using the LINQ let syntax: Thanks for contributing an answer to Stack Overflow! vegan) just to try it, does this inconvenience the caterers and staff? In a LINQ query, the from clause comes first in order to introduce the data source ( customers) and the range variable ( cust ). You can create a new method to check age using if else and call that method from linq Query Result=CheckAge (p.Age) public string CheckAge (int age) { if (age <= 24) return "Age is less than 24 yrs"; else if (age <= 40) return "Age is less than 40 yrs"; else if (age >= 60) return "Age is more than 60 yrs"; return ""; } @hanzolo: Yes it's true, but I decided to be neutral in this case, for the sake of generality, since he was using var. Join Operators These LINQ query operators are used to combine multiple sequence into one sequence just like joins in SQL queries. "We, who've been connected by blood to Prussia's throne and people since Dppel". Using .Select and .Where in a single LINQ statement LINQ to SQL avoids such . How do you get out of a corner when plotting yourself into a corner. Ask for this RAVE RE 850 E-TEC Ice Ripper XT 1.25 M.S. If you are using LinQ with EF Core, an easy example can be this-. if (condition) { query = query.Where (b => b == "something else"); } You can use the WhereIf statement method avaialbe in LINQ in this way: query = query.WhereIf (condition, b => b == "something else"); So your final code will be: When to use multiple where clauses in LINQ? You can create a new method to check age using if else and call that method from linq Query Result=CheckAge(p.Age), You can use Conditional Logic in the select, sorry i'm confuse with syntax it's my request u define it clearly, That is nothing but if(age<=24) {} else {}, http://msdn.microsoft.com/en-us/library/ty67wk28(v=VS.71).aspx. This is what I did. Asking for help, clarification, or responding to other answers. Is there a single-word adjective for "having exceptionally strong moral principles"? The region and polygon don't match. When no results are returned, you have an 'empty' list. I would put the p.ConditionVariable test at the beginning so taht it is the first thing checked (as && operations stop at the first failing condition. In general though, to apply very different queries, you could either use: IEnumerable<XElement> roles = xlServerRoles.Descendants ("ServerRole"); if (isDup) { roles = roles.Where (dp => . Powershell Or Python3 - CSV file: remove row based on duplicates in a column, with IF ELSE based conditions in another column; else statement issue powershell script; LINQ (Language Integrated Query) is a Microsoft programming model and methodology that essentially adds formal query capabilities into Microsoft .NET-based programming languages. LINQ query syntax always ends with a Select or Group clause. "Client" : "Other")) You need to define the variable out of blocks, but then you need to be specific about the type, because C# compiler needs direct assignment expression to infer the type for var keyword. The conditional operator (? Language-Integrated Query (LINQ) is the name for a set of technologies based on the integration of query capabilities directly into the C# language. Optimizing Queries with LINQ . What video game is Charlie playing in Poker Face S01E07? Using LINQ Method Syntax, it is a little difficult to write the join query when joining more than two data sources. Why should transaction_version change with removals? You need to declare result before the if statement: Or you can keep the var declaration in this other variant: Now you should somehow find a way to either change that if or remove it completely because result cannot be null at that point. How to use if else statement in combobox in VB.NET. Later in the code, I want to loop through the object (alDisabledPrograms). - Projection condition evaluating incorrectly - If condition not evaluating as expected ifelse - evaluating else if after an if condition is true MSBuild 3.5 - MSBuild 3.5 Property Functions in Condition msbuild For this example I have used of Northwind database that you can download using the link given below. Hope you got my point, I have no idea what you are asking either but it sounds like the answer involves a. When the condition expression evaluates true, it executes code block 1; Otherwise, it executes code block 2. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. You can perform the where separately from the main query: var result = from dm in datacontext.Trk select dm; if (intval == 0) { result = result.Where (dm => dm.ID == 0); } else { result = result.Where (dm => dm.ID != 0); } if (result.Any ()) { // do something } Share Follow answered Jan 20, 2012 at 22:52 Chris Dunaway 10.8k 4 35 47 Why do many companies reject expired SSL certificates as bugs in bug bounties? A place where magic is studied and practiced? Making statements based on opinion; back them up with references or personal experience. I'm adding accountRootTypes as param inside the query if we keep it null it's returning 'Nullable object must have a value' how can I do the condition here. The complete example code is given below. But now, since the same variable is used in all three places, there is a compiler error that the types don't match: Note, with your code your result will always be non-null. If it has any value then I need to search the id which is equal to conditionvariable in table2. switch-case can only compare values that can be used in a switch statement, such as integers and characters, while if/else can use any Boolean expression. There are there Contains Methods available in C# and they are implemented in two different namespaces. Or just do a for each on var, and in side the for each, set a bool to true, that will mean you have data. For example, you might use them like this: var query = items.Where( x => x. SomeProperty > someValue); query = query.If( searchByOtherProperty, q => q.Where( x => x. OtherProperty == otherValue); How can I change property names when serializing with Json.net? A Computer Science portal for geeks. public List<ReportHierarchyModel> GetReportBaseQuery (DateTimeOffset? Is there a reason for C#'s reuse of the variable in a foreach? This applies the condition3 only if condition2 is false. I tried to initially var result = null but C# didn't like that. @HafizH can you give a feedback of solutions below? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. IF the first check fails then the || operation is checked next): A second variant would also be possible with myvariable=0 ? The following examples demonstrate some simple LINQ queries by using each approach listed previously. FirstOrDefault () method will return the first element in the sequence that satisfies the specified condition or a default value if no such element is found. Most queries in the introductory Language Integrated Query (LINQ) documentation are written by using the LINQ declarative query syntax. In computer programming, we use the if.else statement to run one block of code under certain conditions and another block of code under different conditions. Find centralized, trusted content and collaborate around the technologies you use most. "We, who've been connected by blood to Prussia's throne and people since Dppel", Movie with vikings/warriors fighting an alien that looks like a wolf with tentacles. I have linq query where I need to set condition if p.conditionVariable > 0 I would apply the following condition. What can a lawyer do if the client wants him to be acquitted of everything despite serious evidence? How is Jesus " " (Luke 1:32 NAS28) different from a prophet (, Luke 1:76 NAS28)? Syntax. +1 (416) 849-8900, select * from tbl_usertotalrating where store_name='". Find centralized, trusted content and collaborate around the technologies you use most. Is it better to return an empty object? If a question is poorly phrased then either ask for clarification, ignore it, or. @value= TotalBookingPrice The following code snippet shows how to write the query to fetch data from three data sources using the LINQ Method syntax. This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL). It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Home; Mine; Mala Menu Toggle. To learn more, see our tips on writing great answers. LINQ: When to use SingleOrDefault vs. FirstOrDefault() with filtering criteria, How to handle a hobby that makes income in US, Short story taking place on a toroidal planet or moon involving flying, Bulk update symbol size units from mm to map units in rule-based symbology. Now please take its reference and correct your code. We don't know where the names come from, so you should provide the code that produces that expression-tree, probably. I'm really sorry if i am making it complex, If else condition in multiple from in LINQ in C#, How Intuit democratizes AI development across teams through reusability. You also must use a method call for a query that retrieves the element that has the maximum value in a source sequence. Connect and share knowledge within a single location that is structured and easy to search. In my case, I wanted to keep the elements which met my criteria and log the ones that didn't without iterating multiple times. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Using a dynamic LINQ library we can do the following, Select statement at runtime (pass select statement as string) Where condition at runtime (pass where statement as string) Here in this article we will first see what happens without using a dynamic LINQ library if we are passing a SELECT Statement at runtime. . by stock number or make and model. Staging Ground Beta 1 Recap, and Reviewers needed for Beta 2. You can simply use List to create a search collection.

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