Web hosting services - CHAPTER 2 36 BUILDING C# APPLICATIONS Building
CHAPTER 2 36 BUILDING C# APPLICATIONS Building C# Applications Using csc.exe Now that your development machine recognizes csc.exe, the next goal is to build a simple single file assembly named TestApp.exe using the C# command-line compiler and Notepad. First, you need some source code. Open Notepad and enter the following: // A simple C# application. using System; class TestApp { public static void Main() { Console.WriteLine(”Testing! 1, 2, 3″); } } Once you have finished, save the file in a convenient location (e.g., C:CscExample) as TestApp.cs. Now, let s get to know the core options of the C# compiler. The first point of interest is to understand how to specify the name and type of assembly to create (e.g., a console application named MyShell.exe, a code library named MathLib.dll, aWindows Forms application named MyWinApp.exe, and so forth). Each possibility is represented by a specific flag passed into csc.exe as a command-line parameter (see Table 2-2). Table 2-2. Output-centric Options of the C# Compiler Option Meaning in Life /out This option is used to specify the name of the assembly to be created. By default, the assembly name is the same as the name of the initial input *.cs file (in the case of a *.dll) or the name of the type containing the program s Main() method (in the case of an *.exe). /target:exe This option builds an executable console application. This is the default file output type, and thus may be omitted when building this application type. /target:library This option builds a single-file *.dll assembly. /target:module This option builds a module. Modules are elements of multifile assemblies (fully described in Chapter 11). /target:winexe Although you are free to build Windows-based applications using the /target:exe flag, the /target:winexe flag prevents a console window from appearing in the background. To compile TestApp.cs into a console application named TextApp.exe, change to the directory containing your source code file and enter the following command set (note that command-line flags must come before the name of the input files, not after): csc /target:exe TestApp.cs Here I did not explicitly specify an /out flag, therefore the executable will be named TestApp.exe, given that TestApp is the class defining the program s entry point (the Main() method). Also be aware that most of the C# compiler flags support an abbreviated version, such as /t rather than /target (you can view all abbreviations by entering csc /? at the command prompt): csc /t:exe TestApp.cs Furthermore, given that the /t:exe flag is the default output used by the C# compiler, you could also compile TestApp.cs simply by typing csc TestApp.cs
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