[Mono-list] WCF Empty Array Bug

marcg mgatley at data-afrique.com
Wed Mar 3 11:10:40 EST 2010


I am using a basicHttpBinding to communicate with an IIS 7 hosted WCF
service from a WinForms ported application (running on Mono 2.6.1). 

If the WCF Service returns an empty array or an object containing an empty
array the call results in the following exception: 

Exception in async operation: System.InvalidOperationException: Failed to
set va 
lue of type System.Collections.ArrayList for property
earchField[] Fields ---> System.ArgumentException: failed to convert
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags
Attr, System.Reflection.Binder binder, System.Object[] parameters,
ization.CultureInfo culture) [0x00000] in <filename unknown>:0 

The error goes away if I return null instead of the empty array. 

Is this a known issue? Is there a fix/workaround - I have over 10 WCF
Service projects each with 20+ methods returning arrays which could be
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