将逻辑功能作为参数传递给通用功能

Question

Trying to reduse some code and follow the DRY principle with a generic approach. The code is kind of trivial, but I can not manage to compile it. I guess you see what I'm trying to do here (not repeat GetData(), but rather have several Logic() func's), what am I doing wrong?

Caller:

IEnumerable<IMyClass> result = Factory.GetData<IEnumerable<IMyClass>>("storedProsedureName", Factory.LogicFunction());

Logic:

public static IEnumerable<T> GetData<T>(string storedProsedureName, Func<string, OracleConnection, OracleCommand, IEnumerable<T>> functionCall) where T : class
    {
        using (OracleConnection conn = new OracleConnection(Helpers.GetConnectionString()))
        {
            using (OracleCommand cmd = conn.CreateCommand())
            {
                try
                {
                    return functionCall(storedProsedureName, conn, cmd);
                }
                catch (Exception e)
                {
                    throw e;
                }
            }
        }
    }   

public static IEnumerable<IMyClass> LogicFunction(string storedProsedureName= "", OracleConnection conn = null, OracleCommand cmd = null)
{
    conn.Open();

    {...}

     conn.Close();
     return IEnumerable<IMyClass>;
}

Error:

Argument 2: cannot convert

from

'System.Collections.Generic.IEnumerable_IMyClass>'

to

'System.Func_string, OracleConnection, OracleCommand, IEnumerable _IEnumerable_IMyClass>>>'

Answer 1

Change your caller to below code.

Removed () and also changed generic closing type from IEnumerable<IMyClass> to IMyClass .

IEnumerable<IMyClass> result = Factory.GetData<IMyClass>("storedProsedureName", Factory.LogicFunction);