我玩弄了一个类似于 .net 核心网络主机如何在控制台应用程序中等待关闭的想法。我在 GitHub 上对其进行了审查，并能够提取他们如何执行 Run
的要点
https://github.com/aspnet/Hosting/blob/15008b0b7fcb54235a9de3ab844c066aaf42ea44/src/Microsoft.AspNetCore.Hosting/WebHostExtensions.cs#L86
public static class ConsoleHost {
/// <summary>
/// Block the calling thread until shutdown is triggered via Ctrl+C or SIGTERM.
/// </summary>
public static void WaitForShutdown() {
WaitForShutdownAsync().GetAwaiter().GetResult();
}
/// <summary>
/// Runs an application and block the calling thread until host shutdown.
/// </summary>
/// <param name="host">The <see cref="IWebHost"/> to run.</param>
public static void Wait() {
WaitAsync().GetAwaiter().GetResult();
}
/// <summary>
/// Runs an application and returns a Task that only completes when the token is triggered or shutdown is triggered.
/// </summary>
/// <param name="host">The <see cref="IConsoleHost"/> to run.</param>
/// <param name="token">The token to trigger shutdown.</param>
public static async Task WaitAsync(CancellationToken token = default(CancellationToken)) {
//Wait for the token shutdown if it can be cancelled
if (token.CanBeCanceled) {
await WaitAsync(token, shutdownMessage: null);
return;
}
//If token cannot be cancelled, attach Ctrl+C and SIGTERN shutdown
var done = new ManualResetEventSlim(false);
using (var cts = new CancellationTokenSource()) {
AttachCtrlcSigtermShutdown(cts, done, shutdownMessage: "Application is shutting down...");
await WaitAsync(cts.Token, "Application running. Press Ctrl+C to shut down.");
done.Set();
}
}
/// <summary>
/// Returns a Task that completes when shutdown is triggered via the given token, Ctrl+C or SIGTERM.
/// </summary>
/// <param name="token">The token to trigger shutdown.</param>
public static async Task WaitForShutdownAsync(CancellationToken token = default (CancellationToken)) {
var done = new ManualResetEventSlim(false);
using (var cts = CancellationTokenSource.CreateLinkedTokenSource(token)) {
AttachCtrlcSigtermShutdown(cts, done, shutdownMessage: string.Empty);
await WaitForTokenShutdownAsync(cts.Token);
done.Set();
}
}
private static async Task WaitAsync(CancellationToken token, string shutdownMessage) {
if (!string.IsNullOrEmpty(shutdownMessage)) {
Console.WriteLine(shutdownMessage);
}
await WaitForTokenShutdownAsync(token);
}
private static void AttachCtrlcSigtermShutdown(CancellationTokenSource cts, ManualResetEventSlim resetEvent, string shutdownMessage) {
Action ShutDown = () => {
if (!cts.IsCancellationRequested) {
if (!string.IsNullOrWhiteSpace(shutdownMessage)) {
Console.WriteLine(shutdownMessage);
}
try {
cts.Cancel();
} catch (ObjectDisposedException) { }
}
//Wait on the given reset event
resetEvent.Wait();
};
AppDomain.CurrentDomain.ProcessExit += delegate { ShutDown(); };
Console.CancelKeyPress += (sender, eventArgs) => {
ShutDown();
//Don't terminate the process immediately, wait for the Main thread to exit gracefully.
eventArgs.Cancel = true;
};
}
private static async Task WaitForTokenShutdownAsync(CancellationToken token) {
var waitForStop = new TaskCompletionSource<object>();
token.Register(obj => {
var tcs = (TaskCompletionSource<object>)obj;
tcs.TrySetResult(null);
}, waitForStop);
await waitForStop.Task;
}
}
我尝试改写 IConsoleHost 之类的东西，但很快意识到我过度设计了它。将主要部分提取为类似于await ConsoleUtil.WaitForShutdownAsync(); 的东西，其操作类似于Console.ReadLine
这样就可以像这样使用该实用程序
public class Program {
public static async Task Main(string[] args) {
//relevant code goes here
//...
//wait for application shutdown
await ConsoleUtil.WaitForShutdownAsync();
}
}
从那里创建一个 systemd，如以下链接所示，应该可以帮助您完成剩下的工作
Writing a Linux daemon in C#