How to change the following sql query to Linq query

How to change the following sql query to Linq query

By : user2951564
Date : November 18 2020, 11:13 AM
should help you out How to change the following sql query to Linq query
code :
var inner = from cid in FacebookLikeCategories where cid.UserID = 18 select cid.FacebookLikeCategoryID;
var result = from res in FacebookLikes where inner.Contains(res.UserID) select res.[like];

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How can i change the following LINQ query as normal sql query

How can i change the following LINQ query as normal sql query

By : user3413629
Date : March 29 2020, 07:55 AM
I hope this helps . Here's the SQL produced by your LINQ query, per LINQPad, where @p0 is the number of rows to Skip:
code :
SELECT [t3].[CustomerID] AS [ID], [t3].[ContactName] AS [Name], (
    FROM [Customers] AS [t4]
    ) AS [Count]
    SELECT [t2].[CustomerID], [t2].[ContactName], [t2].[ROW_NUMBER]
    FROM (
        SELECT ROW_NUMBER() OVER (ORDER BY [t1].[ContactName]) AS [ROW_NUMBER], [t1].[CustomerID], [t1].[ContactName]
        FROM (
            SELECT TOP (10) [t0].[CustomerID], [t0].[ContactName]
            FROM [Customers] AS [t0]
            ORDER BY [t0].[ContactName]
            ) AS [t1]
        ) AS [t2]
    WHERE [t2].[ROW_NUMBER] > @p0
    ) AS [t3]
How to change sql query left join to linq query

How to change sql query left join to linq query

By : Ricardo
Date : March 29 2020, 07:55 AM
Hope that helps I want to change SQL Server statement to linq. I'm beginner for linq. I need to modify linq statement in my application but I understand the SQL statement. , I converted to Linq with this code.
Thank for all suggestion.
code :
 public IList<OHList> GetValues_Admin(Guid companyID)
IList<OHList> tblObj = null;

    tblObj = (from OH in _entities.tbl_OrderHeader
              join DO in _entities.tbl_DeliveryOrder on OH.ID equals DO.OrderHeaderID into t1
              from t11 in t1.DefaultIfEmpty()
              join IH in _entities.tbl_InvoiceHeader on OH.ID equals IH.OrderHeaderID into t2
              from t22 in t2.DefaultIfEmpty()
              join UA in _entities.tbl_UserAccount on OH.CreatedUserID equals UA.ID                          
              join UP in _entities.tbl_UserProfile on UA.UserProfileID equals UP.ID
              where (OH.Active == true) && (UP.CompanyID == companyID)
              orderby OH.OrderNo descending
              select new OHList 
                  OrderNo = OH.OrderNo,
                  PONo = OH.PONo,
                  CostCenter = OH.CostCenter,
                  ExpectedDeliveryDate = OH.ExpectedDeliveryDate,
                  DeliveryDate = t11.DeliveryDate,
                  PrimaryContactPerson = OH.PrimaryContactPerson ?? "",
                  AlternateContactPerson = OH.AlternateContactPerson ?? "",
                  PrimaryContactNo = OH.AlternateContactNo ?? "",
                  AlternateContactNo = OH.AlternateContactNo ?? "",
                  CreatedDate = OH.CreatedDate,
                  OrderDate = OH.CreatedDate,
                  WaybillNo = OH.WaybillNo,
                  DeliveryStatus = t11.DeliveryStatus,
                  Email = OH.Email ?? "",
                  Address = OH.Address ?? "",
                  PostalCode = OH.PostalCode ?? "",
                  City = OH.City ?? "",
                  Branch = OH.Branch,
                  DONo = t11.DONo,
                  InvoiceNo = t22.InvoiceNo ?? "",
                  IsPaid = (t22.IsPaid == true) ? true : (bool?)null
catch (Exception ex)
    return tblObj;
EntityFramework LINQ query count fails but query returns result. How to optimize LINQ query?

EntityFramework LINQ query count fails but query returns result. How to optimize LINQ query?

By : Milly
Date : March 29 2020, 07:55 AM
This might help you Not quite sure that's the problem, but at least let try to eliminate the potential effect of the so called Parameter Sniffing Problem by eliminating the dateStart / dateEnd parameters by manually building expression with constant values.
First, a little helper method:
code :
using System;
using System.Linq;
using System.Linq.Expressions;

public static class QueryableUtils
    public static IQueryable<T> WhereBetween<T>(this IQueryable<T> source, Expression<Func<T, DateTime>> dateSelector, DateTime? startDate, DateTime? endDate)
        if (startDate == null && endDate == null) return source;
        var startCond = startDate != null ? Expression.GreaterThanOrEqual(dateSelector.Body, Expression.Constant(startDate.Value)) : null;
        var endCond = endDate != null ? Expression.LessThanOrEqual(dateSelector.Body, Expression.Constant(endDate.Value)) : null;
        var predicate = Expression.Lambda<Func<T, bool>>(
            startCond == null ? endCond : endCond == null ? startCond : Expression.AndAlso(startCond, endCond),
        return source.Where(predicate);
//if (dateStart.HasValue)
//    query = query.Where(e => e.outer.ValueDate >= dateStart.Value);
//if (dateEnd.HasValue)
//    query = query.Where(e => e.outer.ValueDate <= dateEnd.Value);
query = query.WhereBetween(e => e.outer.ValueDate, dateStart, dateEnd);
To optimize my linq query which listed as top consuming query in azure query performance insight tool

To optimize my linq query which listed as top consuming query in azure query performance insight tool

By : Jamie
Date : March 29 2020, 07:55 AM
To fix the issue you can do Finally i have reduced my query execution time from 55 seconds to on an average 4.5 seconds by removing AsNoTracking().ToList().
Old query which was taken too much time to execute.
code :
  var onlineData = from od in peopleStatuc.AsNoTracking().ToList()
  var onlineData = from od in peopleStats
linq query insert exist query string into linq query

linq query insert exist query string into linq query

By : user2288217
Date : March 29 2020, 07:55 AM
Does that help I want to make the query follow the query string of the website but it cant be done in this way, is there any other option to do something like this? For example i can insert name,type,class in the query string but not every variable is need to search for the student , try this:
code :
        var query = from c in db.Students select c;
        if (Request.QueryString["Name"] != null)
            name = Request.QueryString["Name"];
            query = query.Where(c => c.name == name);

        if (Request.QueryString["Type"] != null)
            type += Request.QueryString["Type"];
            query = query.Where(c => c.type == type);

        GridView1.DataSource = query.ToList()
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