Guid is all 0 s zeros

Question

I m testing out some WCF services that send objects with Guids back and forth  In my web app test code  I m doing the following   var responseObject   proxy CallService new RequestObject       Data    misc  data       Guid   new Guid         For some reason  the call to new Guid   is generating Guids with all 0 s  zeros  like this   00000000-0000-0000-0000-000000000000  What could be causing this

User · Answer

Can t tell you how many times this has caught  me   Guid myGuid   Guid NewGuid

User · Answer

In the spirit of being complete  the answers that instruct you to use Guid NewGuid   are correct   In addressing your subsequent edit  you ll need to post the code for your RequestObject class  I m suspecting that your guid property is not marked as a DataMember  and thus is not being serialized over the wire  Since default Guid  is the same as new Guid    i e  all 0 s   this would explain the behavior you re seeing

User · Answer

Lessons to learn from this   1  Guid is a value type  not a reference type   2  Calling the default constructor new S   on any value type always gives you back the all-zero form of that value type  whatever it is   It is logically the same as default S

User · Answer

Use the static method Guid NewGuid   instead of calling the default constructor   var responseObject   proxy CallService new RequestObject       Data    misc  data       Guid   Guid NewGuid

User · Answer

Try doing   Guid foo   Guid NewGuid

User · Answer

Try this instead   var responseObject   proxy CallService new RequestObject       Data    misc  data       Guid   new Guid NewGuid         This will generate a  real  Guid value   When you new a reference type  it will give you the default value  which in this case  is all zeroes for a Guid    When you create a new Guid  it will initialize it to all zeroes  which is the default value for Guid   It s basically the same as creating a  new  int  which is a value type but you can do this anyways    Guid g1                        g1 is 00000000-0000-0000-0000-000000000000 Guid g2   new Guid             g2 is 00000000-0000-0000-0000-000000000000 Guid g3   default Guid         g3 is 00000000-0000-0000-0000-000000000000 Guid g4   Guid NewGuid         g4 is not all zeroes   Compare this to doing the same thing with an int   int i1                         i1 is 0 int i2   new int               i2 is 0 int i3   default int           i3 is 0

[c#] Guid is all 0's (zeros)?

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