.NET 7 WCF Client throws exception deserializing response from .NET Framework 4.7.2 WCF Server when the response has a double with a decimal point #79092
Description
Description
We've upgraded one of our projects to .NET 7 because it fixes memory-related exceptions we were seeing in Blazor in .NET 6. This project needs to be able to communicate with a WCF Service hosted by an application that uses .NET Framework 4.7.2. When a service call sends a result back to the client that includes a double with a decimal point in it, an exception is thrown.
Reproduction Steps
Download source code from https://github.com/hlipsey/WCFDeserializationIssueInNET7
Open WCFClient7.sln and WCFServer472.sln
Run WCFServer472
Run WCFClient7
Expected behavior
Both calls run successfully
Actual behavior
The first call that is multiplying integers runs successfully. On the second call, an exception is thrown during deserialization of the message. The inner exception varies, but the outer exception is: System.ServiceModel.Dispatcher.NetDispatcherFaultException: 'The formatter threw an exception while trying to deserialize the message http://tempuri.org/:TheMessageType'
Regression?
This communication worked fine in .NET 6
Known Workarounds
No response
Configuration
WCF Server is running .NET Framework 4.7.2
WCF Client is running .NET 7
Builds target AnyCPU, running on an x64 machine
Not sure if the issue is specific to .NET 7 communicating with .NET 4.7.2 - I'm not familiar with using CoreWCF or ASP.NET to host it, so have not tested that.
Other information
The inner exception received changes with the data. Sometimes it says that the source is improperly formatted, sometimes it's an xml exception saying that certain elements are not closed, and sometimes it says it did not expect a character 'x'.