Partical class with linq

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Hi all,
I have Repository contains :

C#

public T Single(Func<T, bool> exp)
     {
         return GetTable.SingleOrDefault(exp);
     }

Linq contain tables: City
I want to create a partial class and add more property in it. I have created in DAL.BO

C#

public partial class City : DAL.City
{
      public string StateName
      {
          get
          {
              return this.StateZipCode.Name;
          }
      }
}

Everything seems OK, but in code, when I want find City:
DAL.BO.City city = unitOfWork.CityRepository.Single(a => a.CityID == Convert.ToInt16(empid));.
It can not convert from DAL.City to DAL.BO.City.
I know that problem.
How can I do now ?

Posted 28-Oct-14 6:41am

baotdinh

Updated 28-Oct-14 6:44am

Maciej Los

v2

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Comments

Sergey Alexandrovich Kryukov 28-Oct-14 13:02pm

Partial classes is just a syntax candy (very good one); they are unrelated to the problem.
You did not show DAL.BO.City in your code sample, and did not show all namespaces involved.
The question does not makes much sense. Just use VS's "Go to definition" and see what is where, then fix it.
—SA

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Maciej Los · Answer 1 · 2014-10-28T07:20:00

Solution 1

Please, read Sergey's comment to he question. As he mentioned, the declaration of class is wrong.

Please, read this: Partial Classes and Methods (C# Programming Guide)[^].
It looks like you want to create nested classes[^] ((recommendations)[^].

The proper definition is:

C#

class DAL
{
    //properties and methods
    partial class BO
    {
        //properties and methods
    
        partial class City
        {
            //properties and methods
        }
    }
}

It should give you: DAL.BO.City

Posted 28-Oct-14 7:20am

Maciej Los

Updated 28-Oct-14 10:03am

v2

Comments

Sergey Alexandrovich Kryukov 28-Oct-14 15:55pm

Yes.
Or, it could be

namespace DAL.BO;
partial class City {/* ... */}

The actual problem is having two different classes instead of one. It gives me the idea: probably OP thought that some two class parts (in the sense of partial definitions) merge into one type, but in fact, it appeared to be two different types, due to some mess in namespaces/nesting.

—SA

Maciej Los 28-Oct-14 16:02pm

It could be. Let's see ;)