I have a class that interfaces with a linq class and uses the System.Data.Linq.Binary datatype. I'm trying to write a simple class that takes a generic arrangement that denotes the datatype stored as binary:
// .Value is a System.Data.Linq.Binary DataType
public class DataType<T> where T : class
{
public T Value
{
get
{
return from d in Database
where d.Value = [Some Argument Passed]
select d.Value as T;
}
}
}
public class StringClass : DataType<string>
{
}
public class ByteClass : DataType<byte[]>
{
}
Will StringClass.Value
correctly cast and return a string
from the database?
Will ByteClass.Value
correctly cast and return a byte[]
from the database?
My main question basically resolves around how System.Data.Linq.Binary can be used.
Edit: How do I convert System.Data.Linq.Binary to T where T can be anything. My code doesn't actually work because I can't cast Binary to T using as.
essentially you are doing
System.Data.Linq.Binary b1;
string str = b as string;
and
System.Data.Linq.Binary b2
byte[] bArray = b2 as byte[];
both str and bArray will be null;
you will need something like
public class DataType<T> where T : class
{
public T Value
{
get
{
// call ConvertFromBytes with linqBinary.ToArray()
// not sure about the following; you might have to tweak it.
return ConvertFromBytes((from d in Database
where d.Value = [Some Argument Passed]
select d.Value).
First().ToArray());
}
}
protected virtual T ConvertFromBytes(byte[] getBytes)
{
throw new NotImplementedException();
}
}
public class StringClass : DataType<string>
{
protected override string ConvertFromBytes(byte[] getBytes)
{
return Encoding.UTF8.GetString(getBytes);
}
}
public class ByteClass : DataType<byte[]>
{
protected override byte[] ConvertFromBytes(byte[] getBytes)
{
return getBytes;
}
}
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