Question

I’m writing a query that returns a list of models that needs data from two tables and I’m hoping the let keyword can help me. I’m starting like this:

var TheListOfModels = 
                let Data1 = (from a in MyDC.Table1
                              where ....
                              select new ObjectThatContainsData1()
                              {

                              }).ToList()

                let Data2  = (from b in MyDC.Table2
                              where ....
                              select new ObjectThatContainsData2()
                              {

                              }).Tolist()                 

                select new ObjectThatContainsBothData()
                { 
                     SomeProp1 = from p in Data1
                                 select everything

                     SomeProp2 = from a in Data2
                                 select everything

                }).ToList()

I’m not too sure on how to proceed and write the final select statement that selects from the result of the 2 let clauses rather than directly from tables. Is the structure of the query I’m writing a good starting point or should I write it another way?

Thanks.

Edit per comment: table definitions

Table1 looks somewhat like this:

PeachID | UserID | HarvestDateTime | SomeOtherColumn

Table2 looks like that:

AppleID | UserID | HarvestDateTime | SomeOtherColumn

I’m looking to extract all the peaches and apples into a list of the ObjectThatContainsBothData and the where clause is basically there to filter the HarvestDateTime and the UserID

Answer 1

Looks like you are trying to apply Linq query syntax to ordinal C# code. Just create your object and execute two queries to get data fro both properties:

var result = new ObjectThatContainsBothData() 
             {
                 SomeProp1 = db.Peaches.Where(...).Select(...).ToList(),
                 SomeProp2 = db.Apples.Where(...).Select(...).ToList()  
             };