Type argument for method'compiler.compile' can not inferred from usage.try specfying the type argument explictily

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C#

public static Func<TAGEntities, BusinessAddress, CustomerMerchant, Customer, User, IQueryable<BaseBusinessAddressModel>> GetOrdersQuery =

CompiledQuery.Compile((TAGEntities db, BusinessAddress address, CustomerMerchant merchant, Customer cus, User user) =>(db)=>

(from b in db.BusinessAddresses.Where(PredicateBuilder.True<BusinessAddress>())
 join cm in db.CustomerMerchants on address.BusinessId equals merchant.BusinessId
 join c in db.Customers on merchant.CustomerId  equals c.Id
 join u in db.Users on cus.UserId equals cus.Id
 select new  BaseBusinessAddressModel
 {
     Id = b.Id,
     BusinessId = b.BusinessId,
     BusinessAddressTypeId = b.BusinessAddressTypeId,
     BranchCode = b.BranchCode,
     AddressLine1 = b.AddressLine1,
     -------------=-----------
     -------------=-------------
     LastUpdated = b.LastUpdated,
     IsDeleted = b.IsDeleted,
     LogiName = u.LoginName,
     TimeZone = b.TimeZone
}

Error occured at compile() method in query.
Please help me.
Thanks....

What I have tried:

C#

public static Func<TAGEntities, BusinessAddress, CustomerMerchant, Customer, User, IQueryable<BaseBusinessAddressModel>> GetOrdersQuery =

CompiledQuery.Compile((TAGEntities db, BusinessAddress address, CustomerMerchant merchant, Customer cus, User user) =>(db)=>

(from b in db.BusinessAddresses.Where(PredicateBuilder.True<BusinessAddress>())
 join cm in db.CustomerMerchants on address.BusinessId equals merchant.BusinessId
 join c in db.Customers on merchant.CustomerId  equals c.Id
 join u in db.Users on cus.UserId equals cus.Id
 select new  BaseBusinessAddressModel
 {
     Id = b.Id,
     BusinessId = b.BusinessId,
     BusinessAddressTypeId = b.BusinessAddressTypeId,
     BranchCode = b.BranchCode,
     AddressLine1 = b.AddressLine1,
     -------------=-----------
     -------------=-------------
     LastUpdated = b.LastUpdated,
     IsDeleted = b.IsDeleted,
     LogiName = u.LoginName,
     TimeZone = b.TimeZone
}

Error occured at compile() method in query.

Posted 8-Sep-20 6:44am

Krishna Veni

Updated 8-Sep-20 22:10pm

v3

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Comments

F-ES Sitecore 8-Sep-20 12:50pm

You have to specify the types for the arguments and the result you expect in angled brackets after the Compile method.

CompiledQuery.Compile<ArgType1, ArgType2, ResultType>(...)

https://docs.microsoft.com/en-us/dotnet/framework/data/adonet/ef/language-reference/compiled-queries-linq-to-entities

Not knowing any of the types you're using it's hard to give a precise answer.

[no name] 8-Sep-20 12:53pm

Then try it "without compiling".

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Richard Deeming · Answer 1 · 2020-09-08T22:11:00

Looking at the documentation, it should be:

C#

public static Func<TAGEntities, BusinessAddress, CustomerMerchant, Customer, User, IQueryable<BaseBusinessAddressModel>> GetOrdersQuery =
    CompiledQuery.Compile<TAGEntities, BusinessAddress, CustomerMerchant, Customer, User, IQueryable<BaseBusinessAddressModel>>((db, address, merchant, cus, user) =>
        from b in db.BusinessAddresses.Where(PredicateBuilder.True<BusinessAddress>())
        join cm in db.CustomerMerchants on address.BusinessId equals merchant.BusinessId
        join c in db.Customers on merchant.CustomerId  equals c.Id
        join u in db.Users on cus.UserId equals cus.Id
        select new  BaseBusinessAddressModel
        {
            Id = b.Id,
            BusinessId = b.BusinessId,
            BusinessAddressTypeId = b.BusinessAddressTypeId,
            BranchCode = b.BranchCode,
            AddressLine1 = b.AddressLine1,
            ...
            LastUpdated = b.LastUpdated,
            IsDeleted = b.IsDeleted,
            LogiName = u.LoginName,
            TimeZone = b.TimeZone
        });

Compiled Queries (LINQ to Entities) - ADO.NET | Microsoft Docs[^]