Rory Primrose

Learn from my mistakes, you don't have time to make them yourself

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Transport connection closed exception with nDumbster

I have been using nDumbster on a project to unit test sending emails. It has been an interesting experience working with this little tool. It is a great product but has been out of development for a while and has some issues.

The more I started using nDumbster in test runs, the more I was finding that it wasn’t working so well. I was consistently getting the following exception:

Test method [TestName] threw exception:  System.Net.Mail.SmtpException: Failure sending mail. —>  System.IO.IOException: Unable to read data from the transport connection: net_io_connectionclosed.. System.Net.Mail.SmtpReplyReaderFactory.ProcessRead(Byte[] buffer, Int32 offset, Int32 read, Boolean readLine) System.Net.Mail.SmtpReplyReaderFactory.ReadLines(SmtpReplyReader caller, Boolean oneLine) System.Net.Mail.SmtpReplyReaderFactory.ReadLine(SmtpReplyReader caller) System.Net.Mail.CheckCommand.Send(SmtpConnection conn, String& response) System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, String from) System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception) System.Net.Mail.SmtpClient.Send(MailMessage message) System.Net.Mail.SmtpClient.Send(MailMessage message)

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CodeDom does not support the ConditionalAttribute

I need to output some debug statements from a PolicyActivity as I’m having some issues with running a workflow from a unit test. Adding some Debug.WriteLine statements to the rule set seems like a good idea given that I am not getting the WF designer step through experience from MSTest. I thought about whether CodeDom checks for the Conditional attribute before it invokes a method.

CodeDom evaluates the xml rules and executes the instructions in C#. At compile time, native C# is striped of any method call that is decorated with a ConditionalAttribute that does not match the additional compilation symbols of the build configuration. For example, the Debug.WriteLine statement is decorated with Conditional(“Debug”) attribute so any calls to this method in a typical Release build configuration will get stripped out as the Debug compilation symbol is not defined. What about CodeDom though?

As expected, CodeDom does not check the ConditionalAttribute marker on methods it invokes. As such, debugging methods are evaluated and invoked at runtime regardless of the build configuration.

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ActivityValidator passes compiler but fails in designer

I have a custom WF activity that uses a type converter to convert from a source object to a destination object. I added an ActivityValidator to the activity to check that the TypeConverterType property specified to use for the conversion derives from TypeConverter.

The code originally looked like the following.

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Neovolve ReSharper Plugins 1.1 Released

I have just released a new version of ReSharper Plugins. This version updates the identification and conversion of value types in cref xml documentation references and now supports ReSharper 4.5

Get the goods here.

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Unit testing WF with InternalsVisibleTo

I hit an interesting situation the other day. I had a WF library that I wanted to unit test and I had to add workflows to the unit test assembly to be able to test some of the activities. The unit test project template doesn’t support WF but this is easily fixed by hacking the project file. The assemblies were strong named and there were some internal classes that I was also testing using the InternalsVisibleTo attribute.

All of a sudden the compiler complains that the unit test assembly isn’t signed and the InternalsVisibleTo attribute is not valid. The compiler message clearly indicates that the unit test assembly has not been signed and has null public token. The compiler error looks like this:

Friend access was granted to ‘MyAssembly.UnitTests, PublicKey=0024000004800000940000000945000000240000525341310004000001000100E5D06B6A34E0EBE7386CA8C177B3EEDA66802357F74D8F5D419BF3623C9CE4F7EF2D9081418529E63A6B4C287C3941E1113543C7AF93E1ABE96A1511B3ED3B93F36DB193146BDC932EDB2A03C3CF511C1A798FF3130AD9ABB5044E1F67049878D3CE4686A2E3E5EEA3A098B71778CD8B73651CD5AFC320CDC4F315F7666659B5’, but the output assembly is named ‘MyAssembly.UnitTests, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null’. Try adding a reference to ‘MyAssembly.UnitTests, PublicKey=0024000004800000940000000945000000240000525341310004000001000100E5D06B6A34E0EBE7386CA8C177B3EEDA66802357F74D8F5D419BF3623C9CE4F7EF2D9081418529E63A6B4C287C3941E1113543C7AF93E1ABE96A1511B3ED3B93F36DB193146BDC932EDB2A03C3CF511C1A798FF3130AD9ABB5044E1F67049878D3CE4686A2E3E5EEA3A098B71778CD8B73651CD5AFC320CDC4F315F7666659B5’ or changing the output assembly name to match.

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Generating Sandcastle documentation with TeamBuild

Automatically generating technical documentation from code comments is really easy with Sandcastle and SHFB. If you are using TeamBuild to provide continuous integration then this is a great place to ensure up to date documentation is being produced. There a two ways that Sandcastle can be used to generate documentation. The first is dynamically without a SHFB project file and the second is with a SHFB project file.

Dynamically creating documentation is an easy solution that essentially documents all dll files found in the build directory with some known exclusions. This has the advantage that you don’t need to manage the documentation configuration as assemblies are added and removed from the solution. The disadvantages is that it potentially generates documentation for more assemblies than intended, namely the dependencies for the solution. The dynamic documentation generation is really good for framework/toolkit type solutions that don’t have external dependencies. The dynamic solution tells SHFB the information that it requires that would otherwise be defined via a project file. The MSBuild script looks something like the following.

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How to stream data in WCF service operations

Bruce Zhang has put together a great post about stream operations in WCF.

I have never liked the limitations imposed with streaming in WCF although I do agree with the design. The biggest issue for me is that WCF needs to be configured for a maximum transfer size. The main problem here is that a service and a client will probably not know the maximum size of data that a service could process. To know the maximum size would require a business rule in the service design and that would not be very common for a service that handles large amounts of data via a stream.

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