问题
So ServiceController.WaitForStatus is a blocking call. How can it be done Task/Async manner?
回答1:
The code for ServiceController.WaitForStatus
is:
public void WaitForStatus(ServiceControllerStatus desiredStatus, TimeSpan timeout)
{
DateTime utcNow = DateTime.UtcNow;
this.Refresh();
while (this.Status != desiredStatus)
{
if (DateTime.UtcNow - utcNow > timeout)
{
throw new TimeoutException(Res.GetString("Timeout"));
}
Thread.Sleep(250);
this.Refresh();
}
}
This can be converted to a task based api using the following:
public static class ServiceControllerExtensions
{
public static async Task WaitForStatusAsync(this ServiceController controller, ServiceControllerStatus desiredStatus, TimeSpan timeout)
{
var utcNow = DateTime.UtcNow;
controller.Refresh();
while (controller.Status != desiredStatus)
{
if (DateTime.UtcNow - utcNow > timeout)
{
throw new TimeoutException($"Failed to wait for '{controller.ServiceName}' to change status to '{desiredStatus}'.");
}
await Task.Delay(250)
.ConfigureAwait(false);
controller.Refresh();
}
}
}
Or with support for a CancellationToken
public static class ServiceControllerExtensions
{
public static async Task WaitForStatusAsync(this ServiceController controller, ServiceControllerStatus desiredStatus, TimeSpan timeout, CancellationToken cancellationToken)
{
var utcNow = DateTime.UtcNow;
controller.Refresh();
while (controller.Status != desiredStatus)
{
if (DateTime.UtcNow - utcNow > timeout)
{
throw new TimeoutException($"Failed to wait for '{controller.ServiceName}' to change status to '{desiredStatus}'.");
}
await Task.Delay(250, cancellationToken)
.ConfigureAwait(false);
controller.Refresh();
}
}
}
来源:https://stackoverflow.com/questions/38236238/how-do-do-an-async-servicecontroller-waitforstatus