c# barcode code 39 Figure 8-3. Unexpected content encountered during the deserialization process in C#.net

Build Code 39 Extended in C#.net Figure 8-3. Unexpected content encountered during the deserialization process

Unit tests can be written after you create each method or after you create each class. They should not be created after creating a batch of classes, because your memory of the specific implementation details will start to atrophy the longer you leave it. But creating tests after the code implementation is not the only option; you could also create the tests first. This technique of creating unit tests to test the code that you have not yet written is known as test-driven development and is one of the most successful parts of the various agile approaches. Designing the test in advance forces you to decide exactly how the code will behave before you start to write it, which in turn forces you to think more carefully about the most appropriate implementation. Although it is difficult to prove, it also seems to be the case that testable code is often better-designed code. Certainly, loosely coupled code is more easily testable, so the use of test-driven design will probably make your implementation more loosely coupled and thus more reusable.
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& "database = northwnd" _ ) ' Create command Dim cmd As SqlCommand = conn.CreateCommand() ' Specify that a stored procedure is to be executed cmd.CommandType = CommandType.StoredProcedure cmd.CommandText = "sp_DbException_2" Try ' Open connection conn.Open() ' Execute stored procedure cmd.ExecuteNonQuery() Catch ex As System.Data.SqlClient.SqlException Dim str As String = "" For i As Integer = 0 To ex.Errors.Count - 1 str &= ControlChars.NewLine str &= "Index # " & i str &= ControlChars.NewLine str &= "Exception: " & ex.Errors(i).ToString() str &= ControlChars.NewLine str &= "Number: " & ex.Errors(i).Number.ToString() str &= ControlChars.NewLine Next MessageBox.Show(str, "Database Exception") Catch ex As System.Exception Dim str As String = "Source: " & ex.Source str &= ControlChars.NewLine str &= "Exception Message: " & ex.Message MessageBox.Show(str, "General Exception") Finally If conn.State = ConnectionState.Open Then MessageBox.Show("Finally block closing the connection", "Finally") conn.Close() End If End Try
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As mentioned, you can perform all of the steps here from the command line. You will be using dscl not dsconfigldap, which you used for most other tasks in this chapter. This is because dsconfigldap is a command to specifically perform binding and manage certain aspects of the LDAPv3 plug-in itself, whereas the search policy is global across all directory services plug-ins.
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In this chapter, you learned how to prepare an application to work in parts of the world other than the United States, including the use of stored culture information and the ToString function to determine how to display data, how to use ISO culture codes to reset an app s CulturalInfo object to the user s preferred language and country environment, and finally how to use resource files to provide translated versions of field names, documentation, and even media. We have discussed specific issues to consider when developing applications for international markets, such as dates, numbers, and currency translations between locales, as well as demonstrated approaches to translate application resources via Visual Studio resource files. In the next chapter, we will take a look at how to persist files and settings on Windows Phone 7 via the use of local storage. We will save images and application settings and show how to load them on demand.
Listing 12-6. Calling a Win32 Function in C++/CLI // pinvoke.cpp using namespace System; using namespace System::Runtime::InteropServices; // Note the use of managed equivalents of native types. [DllImport("user32.dll", CharSet=CharSet::Auto)] int MessageBox(IntPtr, String^ text, String^ caption, unsigned int type); int main() { MessageBox(IntPtr::Zero, "Hello, World!", "Win32 Message Box", 0); } You can easily verify that this code works just fine in mixed mode (with the /clr option), pure mode (with the /clr:pure option), and safe mode (with the /clr:safe option). The DllImport attribute takes the DLL name as an argument, as well as an argument that specifies how string arguments are to be treated. As you know, in native code strings may be ANSI or MBCS (type char) or Unicode (type wchar_t). The managed string type is always Unicode, but a lot of APIs take ANSI strings. The CharSet parameter allows you to tell the system to convert the managed string to the desired native string type. Also, it actually controls whether the Unicode or the ANSI version of a Win32 function is called. The CharSet parameter has three possible values: CharSet::Ansi, CharSet::Auto, and CharSet::Unicode. CharSet::Auto lets the system choose the right marshaling on its own. You may know that there is no actual function MessageBox. In WinUser.h, you can see that MessageBox is a macro that resolves to one of the real function names: MessageBoxA for the ANSI version and MessageBoxW for the Unicode version. If you specify CharSet::Unicode, the function called will actually be MessageBoxW. If you specify CharSet::Ansi, it will be MessageBoxA. This mechanism is independent of whether or not UNICODE is defined. This is one of the ways that P/Invoke is fine-tuned for use with the Win32 APIs, although it may be used for any native DLL. If you are using P/Invoke with your own DLL and you want to disable CharSet s automatic mapping to ANSI or Unicode versions of function names, you can set the Boolean property ExactSpelling to true, like this: [DllImport ("mydll.dll", CharSet = CharSet::Ansi, ExactSpelling = true)] Another thing you might be wondering about in Listing 12-6 is the use of IntPtr for the HWND parameter and the use of IntPtr::Zero as the parameter. IntPtr is a useful struct in interop programming since it can be used for a pointer type in native code, but it doesn t appear to be a pointer in managed code. It is CLS compliant, unlike native pointers, so is usable in other languages. The size of IntPtr is dependent on the pointer size for the platform, so it can represent a 32-bit pointer or a 64-bit pointer. It can be converted easily to a 32-bit or 64-bit integer or to an untyped pointer (void *). The IntPtr type may be used to hold values of native OS handles (such as an HWND) and pointers obtained from other P/Invoke calls. If the function you want to import has a name conflict with one you re already using, you can use the EntryPoint property on DllImport to specify the desired native function, and then name the function something else that won t conflict, as in Listing 12-7.
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namespace General { public interface IRemoteFactory
event EventHandler^ Start { // Use the += operator to add a function to the // (multicast) delegate. void add(EventHandler^ handler) { lock lockEvent(this); Console::WriteLine(" Adding Start event handler. "); _start += handler; } void remove(EventHandler^ handler) { lock lockEvent(this); Console::WriteLine(" Removing Start event handler. "); _start -= handler; } protected: // If the underlying delegate is non-null, invoke the // event with the given event arguments. void raise(Object^ sender, EventArgs^ args) { Console::WriteLine(" Firing Start event. "); if (_start) _start->Invoke(sender, args); } } event EventHandler^ Exit { void add(EventHandler^ handler) { lock lockEvent(this); Console::WriteLine(" Adding Exit event handler. "); _exit += handler; } void remove(EventHandler^ handler) { lock lockEvent(this); Console::WriteLine(" Removing Exit event handler. "); _exit -= handler; }
public function fastforward(timeInSeconds:Number=2):void { var currentPosition:Number = channel.position/1000; setTrackPosition(timeInSeconds+currentPosition); }
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