【dotnet跨平台】"dotnet restore"和"dotnet run"都做了些什么？

前言：

关于dotnet跨平台的相关内容，可以参考：跨平台.NET Core--微软开源方向

其中，.net core基础库叫CoreFX：https://github.com/dotnet/corefx，.net core运行时叫CoreCLR：https://github.com/dotnet/coreCLR, asp.net core各组件库：https://github.com/aspnet。

在使用跨平台dotnet时，我们最常用的就是"dotnet restore"和"dotnet run"，那么"dotnet restore"和"dotnet run"都做了些什么？

先看下dotnet restore

源码在：https://github.com/dotnet/cli/tree/rel/1.0.0/src/dotnet/commands/dotnet-restore

入口在这里：https://github.com/dotnet/cli/blob/rel/1.0.0/src/dotnet/commands/dotnet-restore/Program.cs

主要是寻找当前目录下的项目文件（project.json），然后利用NuGet库还原整个项目的依赖库，然后遍历每个目录，生成项目文件，继续还原该项目文件中的依赖项：

public static int Run(string[] args)
{
DebugHelper.HandleDebugSwitch(ref args);
var app = new CommandLineApplication(false)
{
Name = "dotnet restore",
FullName = ".NET project dependency restorer",
Description = "Restores dependencies listed in project.json"
};
// Parse --quiet, because we have to handle that specially since NuGet3 has a different
// "--verbosity" switch that goes BEFORE the command
var quiet = args.Any(s => s.Equals("--quiet", StringComparison.OrdinalIgnoreCase));
args = args.Where(s => !s.Equals("--quiet", StringComparison.OrdinalIgnoreCase)).ToArray();
app.OnExecute(() =>
{
try
{
var projectRestoreResult = NuGet3.Restore(args, quiet);
var restoreTasks = GetRestoreTasks(args);
foreach (var restoreTask in restoreTasks)
{
var project = ProjectReader.GetProject(restoreTask.ProjectPath);
RestoreTools(project, restoreTask, quiet);
}
return projectRestoreResult;
}
catch (InvalidOperationException e)
{
Console.WriteLine(e.Message);
return -1;
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return -2;
}
});
return app.Execute(args);
}

再来看下dotnet run

源码在：https://github.com/dotnet/cli/tree/rel/1.0.0/src/dotnet/commands/dotnet-run

入口在这里：https://github.com/dotnet/cli/blob/rel/1.0.0/src/dotnet/commands/dotnet-run/Program.cs

主要是参数处理，真正的实现在：https://github.com/dotnet/cli/blob/rel/1.0.0/src/dotnet/commands/dotnet-run/RunCommand.cs, 如果是交互的就直接运行，否则编译然后执行。

----------------------------------------------------------RunCommand.cs----------------------------------------------------------

 public int Start()
        {
            if (IsInteractive())
            {
                return RunInteractive(Project);
            }
            else
            {
                return RunExecutable();
            }
        }