WCF hosted in a webservice

[wdudek]

I have a web service hosting a WCF library, which works fine but produced a
strange signature when interacting with vs 2005/2.0 clients. My method takes
3 strings and returns a bool as below.

bool CanRun(string appName, string userName, string function);

However the auto generated proxy in 2005 looks like this

void CanRun(string appName, string userName, string function, out bool
result, out bool resultSpecified);

I unserstand the new result parameter, but what is the resultSpecified
parameter that was created? It looks like it is always the same as the result
parameter, although admittedly I haven't tested this very thouroughly yet?
I'm pushing for WCF in our organization and don't want to get caught not
haveing an explanation of what is occurring here.

Thanks,
Bill

[Steven Cheng [MSFT]]

Hi Bill,

As for the additional "xxxSpecified" parameter, I think it is a webservice
specific behavior for value type parameter/return value. For value type
parameter in webservice, it support marking it as "nullable". However,
since value type always contains a value, the .NET proxy generation will
add an additional parameter for you to indicate whether this value has been
set or not. You can try replace the "bool" type with another reference
type such as string or a custom class .e .g.

=================
[OperationContract]

MyResult CanRunRef(string AppName, string Username, string Function);
....................
}

[DataContract]
public class MyResult
{
[DataMember]
public bool CanRun;
}
================

Then, the generated proxy method won't have that additional output
parameter. For your scenario, I think you do not quite need to use it if
the return value is always a valid/expected value. For more information
about Nullable types in webservice, here is another form thread mentioned
this:

#Consuming WebService which returns NULL-values
http://bytes.com/forum/thread375805.html

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

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--------------------
Thread-Topic: WCF hosted in a webservice
thread-index: AcibJIPR/116RF3rRpymhXG08ZjkVQ==
X-WBNR-Posting-Host: 199.106.94.142
From: =?Utf-8?B?d2R1ZGVr?= <wdu...@newsgroup.nospam>
Subject: WCF hosted in a webservice
Date: Thu, 10 Apr 2008 09:04:11 -0700

[wdudek]

Steven,

Thanks, I don't need to get rid of the parameter, just wanted to
understand what it was so I can explain to the people writing the client apps
why they got it.

Thanks again.

"Steven Cheng [MSFT]" wrote:

> Hi Bill,
>
> As for the additional "xxxSpecified" parameter, I think it is a webservice
> specific behavior for value type parameter/return value. For value type
> parameter in webservice, it support marking it as "nullable". However,
> since value type always contains a value, the .NET proxy generation will
> add an additional parameter for you to indicate whether this value has been
> set or not. You can try replace the "bool" type with another reference
> type such as string or a custom class .e .g.
>
> =================
> [OperationContract]
>
> MyResult CanRunRef(string AppName, string Username, string Function);

> .....................

[Steven Cheng [MSFT]]

That's fine. Thanks for your response.

Have a good day!

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead

Delighting our customers is our #1 priority. We welcome your comments and
suggestions about how we can improve the support we provide to you. Please
feel free to let my manager know what you think of the level of service
provided. You can send feedback directly to my manager at:
msd...@microsoft.com.

==================================================
Get notification to my posts through email? Please refer to
http://msdn.microsoft.com/subscriptions/managednewsgroups/default.aspx#notif
ications.

==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.

--------------------