Cannot serialize object of type System.Object[,]. Multidimensional arrays are not supported

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john harkin - 21 Sep 2004 08:57 GMT

Hi,
I get this on server when trying to retun a 2 dim array.
I apprecaite that they are not supported as per
http://support.microsoft.com/default.aspx?scid=kb;en-us;316273

however i'm looking for as a work around as my web service is a layer
in front of an existing com object which cannot be changed and it
returns the 2 dim array.

All thoughts welcome.

JOhn

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Christoph Schittko [MVP] - 21 Sep 2004 13:53 GMT

You can return jagged arrays, i.e.

System.Object[][] instead of System.Object[,].

HTH,
Christoph Schittko
MVP XML
http://weblogs.asp.net/cschittko

> -----Original Message-----
> From: john harkin [mailto:jjhnospam@yahoo.co.uk]
[quoted text clipped - 17 lines]
>
> JOhn

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john harkin - 23 Sep 2004 12:18 GMT

Hi,
Thanks very much for this and it worked.
I'm actually need to retun an object which could contain object[][].
One thing i notice

[WebMethod]
        public object ReturnJaggedArrayAsObject()
        {
            object[][] numbers = new object[2][] { new object[] {2,"string1",
24.56}, new object[] {4,"string2", 56.78} };
            object a = (object) numbers;
            return a;

        }

didn't work and got a serialisation error but when i added

        [WebMethod]
        public object[][] Fred()
        {
            object[][] numbers = new object[2][] { new object[] {2,"string1",
24.56}, new object[] {4,"string2", 56.78} };

            return numbers;

        }

to the source file i was able to call ReturnJaggedArrayAsObject.
It appears that by having Fred it knows about object[][] in wsdl.
Any way of achieving this without defining Fred?

Regards

> You can return jagged arrays, i.e.
>
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>
> --

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Christoph Schittko [MVP] - 29 Sep 2004 04:25 GMT

Have you tried declaring the array via an Xml serialization attribute on
the return value:

[WebMethod]
[return: XmlElement(typeof(object[][]))]
public object ReturnJaggedArrayAsObject()
{
    object[][] numbers = new object[2][]
    {
        new object[] {2,"string1", 24.56}, new object[]
{4,"string2", 56.78} };

You may have to attach more attributes to declare the types in the
array... not sure at all if this works.

HTH
Christoph Schittko
MVP XML
http://weblogs.asp.net/cschittko

> -----Original Message-----
> From: john harkin [mailto:jjhnospam@yahoo.co.uk]
[quoted text clipped - 72 lines]
> >
> > --

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Cannot serialize object of type System.Object[,]. Multidimensional arrays are not supported

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