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Exception handling with lambda/linq statements


Exception handling with lambda/linq statements

By : user2173551
Date : October 20 2020, 08:10 PM
hope this fix your issue I have the following statement that I am trying to use a try-catch block with , You should place the try around your original statement:
code :
try
{
   var val= db.shops.where(x=>×.id==ID).Select (a=>a.address).First();
}
catch (Exception ex)
{
   return ex; //I assume the return type here is wrong.  Maybe return null?
}
var val= db.shops.where(x=>×.id==ID).Select(a=>a.address).FirstOrDefault();


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Linq 2 SQL Sum using lambda and handling nulls

Linq 2 SQL Sum using lambda and handling nulls


By : riduanh
Date : March 29 2020, 07:55 AM
it fixes the issue . You have to make sure x.Rate is an int, and not an int? (an int that accepts null as a value).
. If the query has no elements, .Sum won't do anything and will return null. Choose a default value, let's say 0.
code :
var query = from f in odc.RDetails
            where f.ticketID == int.Parse(ticket.ToString())
            select f;

int result = query.Any() 
             ? query.Sum(x => x.Rate ?? 0) // use the ?? if x.Rate is an "int?".
             : 0; // default value you can choose.
Lambda Statements in Linq

Lambda Statements in Linq


By : Kamil Jastrzębski
Date : March 29 2020, 07:55 AM
Hope that helps Is it possible to do something like the following in Linq? , I think you're looking for this:
code :
groupsCollection = groups.Select(g =>
    new Group(g.Attributes["id"].Value,
              g.Attributes["title"].Value)).ToList();
Can you convert this Linq statement into Lambda without using join statements?

Can you convert this Linq statement into Lambda without using join statements?


By : Aren Hanesyan
Date : March 29 2020, 07:55 AM
may help you . Basically multiple from clauses contribute SelectMany calls. So your code is something like:
code :
var x = db.Client
          .SelectMany(c => db.Prospects, (c, p) => new { c, p })
          .SelectMany(z => db.Countys, (z, ct) => new { z, ct })
          .Select(zz => new ViewModelExcelReport 
                        {
                            client = zz.z.c.ClientName,
                            cntyCounty = zz.ct.County,
                            sctSection = zz.z.p.Section
                        });
Adding WHERE statements to a LINQ lambda expression

Adding WHERE statements to a LINQ lambda expression


By : Anthony Quivers
Date : March 29 2020, 07:55 AM
seems to work fine The two tables I'm working with here are built like this: , Don't group before apply the conditions:
code :
var items =db.PurchaseLogs
             .Join(db.Users, usr => usr.UserId, x => x.ID, (usr, x) => new { usr, x })
             .Where(i => i.user.CreatedDate >= startDate)
             .Where(i => i.user.CreatedDate <= endDate)
             .Where(i => !i.x.FName.Contains("Guy1"))
             .GroupBy(y => new { y.x.LDAP})
             .Select(g => new
                         {
                          g.Key.LDAP,
                           Count = g.Count()
                          })

             .ToList();
Handling exception in the lambda without try-catch in the lambda

Handling exception in the lambda without try-catch in the lambda


By : Subrat Kumar
Date : March 29 2020, 07:55 AM
will be helpful for those in need As far as I know, one could not handle exception thrown in the lambda if the abstract method implemented by the lambda doesn't have throws in its signature. , I've simplified your example to the core part:
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