Without the semicolon the REPL window will continue to prompt via a period for more input until the semicolon is entered. Expressions, on the other hand, will execute without the semicolon. Hence, System. Start "notepad" will launch Notepad even without the ending semicolon. Furthermore, because the Start method call returns a process, string output of the expression will appear on the command line: [System.
Process Notepad ]. Closing an expression with a semicolon, however, hides the output. Of course, Console. WriteLine "It would take a miracle. The distinction between expressions and statements can result in subtle differences at times. The C script directives for referencing additional assemblies r and importing existing C scripts load are wonderful additions.
One could imagine complex solutions like project. To reference a file from NuGet requires installing the package to a directory and then referencing the specific DLL via the r directive. Microsoft assures me this is coming. Note that at this time the directives refer to specific files. I confess I have a love-hate relationship with Windows PowerShell. I love the convenience of having the Microsoft. NET Framework on the command line and the possibility of passing.
NET objects across the pipe, rather than the traditional text of so many of the CLIs that came before. That said, when it comes to the C language, I am partisan—I love its elegance and power.
Therefore, the idea that I could have the breadth of Windows PowerShell. After launching csi. Suffice it to say, I was disappointed because none of them worked. After pondering the experience and discussing it with the C team, I realized that replacing Windows PowerShell was not what the team was focused on in version 1.
Furthermore, it is the. NET Framework and, therefore, it supports extensibility both by adding your own functions for the preceding commands and even by updating the C script implementation on Roslyn. I immediately set about defining functions for such commands. The start of such a library is available for download on GitHub at github. For those of you looking for a more functional C CLI that supports the previous command list out of the box now, consider ScriptCS at scriptcs.
It, too, leverages Roslyn, and includes alias, cd, clear, cwd, exit, help, install, references, reset, scriptpacks, usings and vars. Note that, with ScriptCS, the command prefix today is a colon as in :reset rather than a number sign as in reset. To approach it as such at the start will result in disappointment. These are C and. NET targeted ways to increase your understanding of the language and. The new compiler based on Roslyn is much better.
It's faster, creates much better code, and can support C 9 features on. First, use dotnet new console to initialize a project in the folder with you source code. Then dotnet run to build and run your program.
Can you explain what exactly this does? It creates two files - a. The Program. For example, what libraries to use, what framework to build it for, whether to ignore certain warnings etc. In that project directory, you can use the command dotnet run to run your project. Alternatively, you can do dotnet build to compile it, and then you can manually click the exe in the bin folder.
The dotnet tool is a wrapper for several other tools such as the nuget package manager and msbuild build system. The first command, dotnet new console tells the tool to create a new csproj aka C Project file in the current directory, named the same as the current directory.
The project file is used by the Roslyn compiler to make decisions about how to compile and link the results. The second command, dotnet run checks the current directory for a csproj file, and if there is exactly one of them, then the project is compiled using the new Roslyn compiler using the Debug configuration and AnyCPU processor target. Assuming the compiler was successful at compiling the code to a shared DLL, it then gets the output type from the project file in this case a standard exe and then links the dll with a bootstrapper for the host OS and outputs the executable binary using the default linker profile for the target.
The csproj file is vital to creating an executable file that you can actually run. Since Dotnet Core and. Net 5. Do I have to do anything with the file when it's generated? In the early days of. Now, none of these things are a hard fact. So with one button, it is possible to update your main application as well as the update application itself. This application makes use of the Ionic zip open source library for unzipping files.
I also make use of the methods, etc. The update class contains the methods for interrogating the version file. The version file, which you will need to place online, takes the format of a pipe delimited file. Getting the update availability information: The getUpdateInfo method downloads a pipe delimited file, splitting the columns, into a List object. One point to note is the line number to start reading the data from — this is a zero based index meaning the first line is 0.
In the example below, we start reading from the second line - I prefer to have a header line as when I amend the version file I can know by looking at the file which information goes where.
As the result of reading the version file is a List object, returned by the getUpdateInfo method, you can place whatever you need to in this file for your update information. I suggest at first to keep it simple with the version, download URL and download filename being the only vital pieces of information required for an update.
One thing to note with keeping the information, in this version file online, is that it allows you to direct users' applications to pick up the new application from whichever location you desire. The installUpdateRestart method is the business end of the UpdateMe application - installing an update and restarting the new version of the UpdateMe application through the update application.
This method starts the update application - passing parameters indicating which file to download and which process to start once the download of the file has completed. The webdata class is used by both the UpdateMe application and the update application. This class contains the methods for downloading data from the online location.
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