try-catch in method having return object T

Question

I have a method in c#, in which it return an object! I need to use a try catch here

this is my method

public T FromBinary()
{
    T obj;
    try
    {
        using (Stream stream = File.Open(this.serializeFilePath, FileMode.Open))
        {
            var binaryFormatter = new BinaryFormatter();
            obj=(T)binaryFormatter.Deserialize(stream);
        }
    }
    catch (Exception e)
    {
        EventLog.WriteEntry("Cannot convert Binary to object", e.Message + "Trace" + e.StackTrace);
    }
    return obj;
}

But i am getting an error

Use of unassigned local variable 'obj'.

How can I use try catch in method having return object T?

@yogi.. Soryy now geting error `Cannot convert null to type parameter 'T' because it could be a non-nullable value type. Consider using 'default(T)' ` — S M, Apr 05 '16 at 07:20

score 7 · Accepted Answer · answered Apr 05 '16 at 07:21

7

Change it to T obj = default(T);.

answered Apr 05 '16 at 07:21

diiN__________

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Byyo · Answer 2 · 2016-04-05T07:30:12.387

4

you have to write T obj = default(T); to assign the variable with a initial value

edited Apr 05 '16 at 07:30

answered Apr 05 '16 at 07:19

Byyo

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score 0 · Answer 3 · answered Apr 05 '16 at 07:25

The error occurs because you are trying to let your method return the object before it has been assigned a value(if the code throws an exception).

the solution is to set your declaration to:

T obj = Default(T);

You should also make it a try-catch-finally so that you allways return the object and close the file stream like this:

}//end of catch block
finnally{
stream.Close();
return obj;
}
}//end of method

try-catch in method having return object T

3 Answers3