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Use ValueTask instead of Task

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This commit is contained in:
弘韬 张 2021-01-04 11:05:59 +08:00
parent aa0ee75950
commit fb640b68c8
1 changed files with 16 additions and 9 deletions
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25
Flow.Launcher/ViewModel/ResultViewModel.cs
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@ -1,4 +1,5 @@
using System;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Media;
@ -12,7 +13,7 @@ namespace Flow.Launcher.ViewModel
{
public class ResultViewModel : BaseModel
{
public class LazyAsync<T> : Lazy<Task<T>>
public class LazyAsync<T> : Lazy<ValueTask<T>>
{
private T defaultValue;
@ -23,21 +24,27 @@ namespace Flow.Launcher.ViewModel
{
if (!IsValueCreated)
{
base.Value.ContinueWith(_ =>
{
_updateCallback();
});
_ = Exercute();
return defaultValue;
}
if (!base.Value.IsCompleted || base.Value.IsFaulted)
return defaultValue;
return base.Value.Result;
// If none of the variables captured by the local function are captured by other lambdas
// , the compiler can avoid heap allocations.
async ValueTask Exercute()
{
await base.Value.ConfigureAwait(false);
_updateCallback();
}
}
}
public LazyAsync(Func<Task<T>> factory, T defaultValue, Action updateCallback) : base(factory)
public LazyAsync(Func<ValueTask<T>> factory, T defaultValue, Action updateCallback) : base(factory)
{
if (defaultValue != null)
{
@ -55,7 +62,7 @@ namespace Flow.Launcher.ViewModel
Result = result;
Image = new LazyAsync<ImageSource>(
SetImage,
SetImage,
ImageLoader.DefaultImage,
() =>
{
@ -82,7 +89,7 @@ namespace Flow.Launcher.ViewModel
public LazyAsync<ImageSource> Image { get; set; }
private async Task<ImageSource> SetImage()
private async ValueTask<ImageSource> SetImage()
{
var imagePath = Result.IcoPath;
if (string.IsNullOrEmpty(imagePath) && Result.Icon != null)