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MainThreadDesktop.cs
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using System.Threading.Tasks;
using static System.Application.Services.IMainThreadPlatformService;
namespace System.Application
{
/// <summary>
/// 适用于桌面端的主线程帮助类，参考 Xamarin.Essentials.MainThread
/// <para><see cref="https://docs.microsoft.com/zh-cn/xamarin/essentials/main-thread"/></para>
/// <para><see cref="https://github.com/xamarin/Essentials/blob/main/Xamarin.Essentials/MainThread/MainThread.shared.cs"/></para>
/// </summary>
public static class MainThreadDesktop
{
public static bool IsMainThread => Instance.PlatformIsMainThread;
public static void BeginInvokeOnMainThread(Action action, DispatcherPriority? priority = null, bool isForce = false)
{
if (!isForce && IsMainThread)
{
action();
}
else
{
Instance.PlatformBeginInvokeOnMainThread(action, priority);
}
}
public static Task InvokeOnMainThreadAsync(Action action, DispatcherPriority? priority = null, bool isForce = false)
{
if (!isForce && IsMainThread)
{
action();
#if NETSTANDARD1_0
return Task.FromResult(true);
#else
return Task.CompletedTask;
#endif
}
var tcs = new TaskCompletionSource<bool>();
BeginInvokeOnMainThread(() =>
{
try
{
action();
tcs.TrySetResult(true);
}
catch (Exception ex)
{
tcs.TrySetException(ex);
}
}, priority, isForce);
return tcs.Task;
}
public static Task<T> InvokeOnMainThreadAsync<T>(Func<T> func, DispatcherPriority? priority = null, bool isForce = false)
{
if (!isForce && IsMainThread)
{
return Task.FromResult(func());
}
var tcs = new TaskCompletionSource<T>();
BeginInvokeOnMainThread(() =>
{
try
{
var result = func();
tcs.TrySetResult(result);
}
catch (Exception ex)
{
tcs.TrySetException(ex);
}
}, priority, isForce);
return tcs.Task;
}
public static Task InvokeOnMainThreadAsync(Func<Task> funcTask, DispatcherPriority? priority = null, bool isForce = false)
{
if (!isForce && IsMainThread)
{
return funcTask();
}
var tcs = new TaskCompletionSource<object?>();
BeginInvokeOnMainThread(
async () =>
{
try
{
await funcTask().ConfigureAwait(false);
tcs.SetResult(null);
}
catch (Exception e)
{
tcs.SetException(e);
}
}, priority, isForce);
return tcs.Task;
}
public static Task<T> InvokeOnMainThreadAsync<T>(Func<Task<T>> funcTask, DispatcherPriority? priority = null, bool isForce = false)
{
if (!isForce && IsMainThread)
{
return funcTask();
}
var tcs = new TaskCompletionSource<T>();
BeginInvokeOnMainThread(
async () =>
{
try
{
var ret = await funcTask().ConfigureAwait(false);
tcs.SetResult(ret);
}
catch (Exception e)
{
tcs.SetException(e);
}
}, priority, isForce);
return tcs.Task;
}
/// <summary>
/// An enunmeration describing the priorities at which
/// operations can be invoked via the Dispatcher.
/// <see cref="https://github.com/dotnet/wpf/blob/master/src/Microsoft.DotNet.Wpf/src/WindowsBase/System/Windows/Threading/DispatcherPriority.cs"/>
/// </summary>
///
public enum DispatcherPriority
{
/// <summary>
/// Operations at this priority are processed when the system
/// is idle.
/// </summary>
SystemIdle,
/// <summary>
/// Minimum possible priority
/// </summary>
MinValue = SystemIdle,
/// <summary>
/// Operations at this priority are processed when the application
/// is idle.
/// </summary>
ApplicationIdle,
/// <summary>
/// Operations at this priority are processed when the context
/// is idle.
/// </summary>
ContextIdle,
/// <summary>
/// Operations at this priority are processed after all other
/// non-idle operations are done.
/// </summary>
Background,
/// <summary>
/// Operations at this priority are processed at the same
/// priority as input.
/// </summary>
Input,
/// <summary>
/// Operations at this priority are processed when layout and render is
/// done but just before items at input priority are serviced. Specifically
/// this is used while firing the Loaded event
/// </summary>
Loaded,
/// <summary>
/// Operations at this priority are processed at the same
/// priority as rendering.
/// </summary>
Render,
/// <summary>
/// Operations at this priority are processed at normal priority.
/// </summary>
Normal,
/// <summary>
/// Operations at this priority are processed before other
/// asynchronous operations.
/// </summary>
Send,
/// <summary>
/// Maximum possible priority
/// </summary>
MaxValue = Send,
}
}
}