I am trying to generate some test data using NBuilder for automation for all the classes that extends a base class wherein each class will have different fields.
Here is my code:
public interface Interface
{
T method<T>() where T : BaseClass;
}
public class DrivedClass: BaseClass,Interface
{
public T method<T>() where T : BaseClass
{
var derviedObj = Builder<DrivedClass>.CreateNew().Build();
return derviedObj;
}
}
return derviedObj
giving error cannot implicity convert derviedObj
to T
I'm not really familiar with nbuilder, but it looks like you could try something like this:
public class DrivedClass: BaseClass,Interface
{
public T method<T>() where T : BaseClass
{
var derviedObj = Builder<T>.CreateNew().Build();
return derviedObj;
}
}
Or this, if that's what you're really after:
public class DrivedClass: BaseClass,Interface
{
public T method<T>() where T : BaseClass
{
var derviedObj = Builder<DrivedClass>.CreateNew().Build();
return derviedObj as T;
}
}
Then you will get T
, but there's really no chance of knowing that it will succeed. What happens when you add another implementation that doesn't inherit DrivedClass
?
public class MoreDrivedClass : BaseClass, FooInterface
{
}
Then this cast will fail:
var drivedClass = new DrivedClass();
var foo = drivedClass.method<MoreDrivedClass>();
Then you will not be able to cast DrivedClass
to MoreDrivedClass
. Foo
will be null.
The method can't return DerivedClass
because there is no way to know if T
is that class or some other one:
SomeOtherDerived v = (new DrivedClass()).method<SomeOtherDerived>();
It is not clear what you trying to achieve, possibly something like following sample:
public interface Interface<T> where T : BaseClass
{
T method();
}
public class DrivedClass: BaseClass,Interface<DerivedClass>
{
public DerivedClass method()
{
DerivedClass derviedObj = Builder<DrivedClass>.CreateNew().Build();
return derviedObj ;
}
}
Try with Activator.CreateInstance.
public class DrivedClass: BaseClass,Interface
{
public T method<T>() where T : BaseClass
{
var derviedObj = Activator.CreateInstance(typeof(T));
return (T)derviedObj ;
}
}
DrivedClass drOb = new DrivedClass ();
var v = drOb.method<desiredType_T>();
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