Possible ?

[Jarod]

Hey
I would like to write a function that returns type given as argument so it
would be likethis:

public GivenType GetFromSomeWhere(object sth, Type givenType)
{
return (givenType) sth;
}

Is it possible to write function that works like above ( it won't work now
But I hope you understand what I need.
Jarod

 

[Lebesgue]

You mean new instance of given Type?

public T GetT<T>()
{
return Activator.CreateInstance<T>();
}

without generics:

public object GetInstance(Type aType)
{
return Activator.CreateInstance(aType);
}

Or do you mean casting the object passed as argument to the given Type?

public object Cast(object from, Type to)
{
return from;
}

This is it. It makes no sense to have a method performing a cast. You can
(and should) do the cast yourself in the code, not have a method to do it.
If you want to get generic, it's possible to write what you need as generic
method, but it's, ehm...dumb.

public T CastToT<T>(object from)
{
return (T)from;
}

 

[Jarod]

{
return (T)from;
}

That's great But I don't use it for casting. I have DataRow and I need
data from it for my properites so it's easier to use GetData<int>(ref myRow,
"SomeField");
But I want to go futher So how to make function that returned typed is
set by function when it works. So in this case it should read the
column.DataType for given fieldName, and set apropriate returned type and
cast to such type.
So code would look like this:

someType GetData(DataRow row, string fieldName)
{
someType = row.Table.Columns[fieldName].DataType;
if ( not null and so on);
return (someType) row[fieldName];
}

Jarod

 

[Lebesgue]

As you may know, methods are compiled at compile time. So you can not change
return types of methods at run time.

public T CastToT<T>(object from)
{
return (T)from;
}

That's great But I don't use it for casting. I have DataRow and I need
data from it for my properites so it's easier to use GetData<int>(ref
myRow, "SomeField");
But I want to go futher So how to make function that returned typed is
set by function when it works. So in this case it should read the
column.DataType for given fieldName, and set apropriate returned type and
cast to such type.
So code would look like this:

someType GetData(DataRow row, string fieldName)
{
someType = row.Table.Columns[fieldName].DataType;
if ( not null and so on);
return (someType) row[fieldName];
}

Jarod