public static InstallerAndRestorer Install()
{
// save the values to restore
var iar = new InstallerAndRestorer();
iar.originalAutoInstallValue = WindowsFormsSynchronizationContext.AutoInstall;
iar.originalSyncContext = SynchronizationContext.Current;
WindowsFormsSynchronizationContext.AutoInstall = true; // enable autoinstall of the official WinForms context
iar.tempControl = new Control {
Visible = false
}; // create a control, which will cause the WinForms context to become installed
return(iar);
}
/// <summary>
/// Runs the action inside a message loop and continues pumping messages
/// as long as any asynchronous operations have been registered
/// </summary>
public static void Run(Action asyncAction)
{
using (InstallerAndRestorer.Install())
{
// InstallerAndRestorer ensures the WinForms context is installed
// capture that WinFormsContext
var winFormsContext = SynchronizationContext.Current;
// wrap the WinForms context in our own decorator context and install that
var asyncVoidContext = new AsyncVoidSyncContext(winFormsContext);
SynchronizationContext.SetSynchronizationContext(asyncVoidContext);
// queue up the first message before we start running the loop
var message = new AsyncActionLaunchMessage(asyncAction, asyncVoidContext);
asyncVoidContext.Post(message.LaunchMessageImpl, state: null);
// run the actual WinForms message loop
Application.Run();
}
}
/// <summary>
/// Runs the function inside a message loop and continues pumping messages
/// until the returned task completes.
/// </summary>
/// <returns>The completed task returned by the delegate's invocation</returns>
public static Task Run(Func <Task> function)
{
using (InstallerAndRestorer.Install())
{
// InstallerAndRestorer ensures the WinForms context is installed
var winFormsContext = SynchronizationContext.Current;
var message = new TaskFunctionLaunchMessage(function, winFormsContext);
// queue up our first message before we run the loop
winFormsContext.Post(message.LaunchMessageImpl, state: null);
// run the actual WinForms message loop
Application.Run();
if (message.ReturnedTask != null)
{
message.ReturnedTask.RethrowForCompletedTasks();
}
return(message.ReturnedTask);
}
}
