等待任务的UIKITThreadAccessException.使用try-catch-finally块运行

问题描述

我有方法

public async Task doSomething()

在方法中，我有代码:

ShowSpinner();

await System.Threading.Tasks.Task.Run(() =>
{
    try
    {
        getValue = value();
    }
    catch(Exception ex)
    {
    }
    finally
    {
        HideSpinner();
    }
    });

ShowSpinner()和 HideSpinner()只是叠加层，可以防止用户与屏幕进行交互并显示旋转轮以指示加载.

The ShowSpinner() and HideSpinner() are simply overlays to prevent the user from interacting with the screen and show a spinning wheel to indicate loading.

我遇到了错误:

我知道这是由于 HideSpinner()引起的.如何解决此一致性错误?

I know that this is because of the HideSpinner(). How can I get around this consistency error?

推荐答案

在这里您可以做两件事，首选方法是在try finally块中等待任务，第二种不太受欢迎的方法是将您的 HideSpinner(); 包裹在 RunOnUiThread 中.

There are two things you can do here, the preferred method would be to await your task inside a try finally block, and the second less preferred method would be to wrap your HideSpinner(); in a RunOnUiThread.

ShowSpinner();
try
{
    var val = await Task.Run(() => "foo");
    // for a little added performance,
    // if val isn't being marshalled to the UI
    // you can use .ConfigureAwait(false);
    // var val = await Task.Run(() => "foo").ConfigureAwait(false);
}
catch { /* gulp */}
finally { HideSpinner(); }

不太受欢迎

ShowSpinner();
await Task.Run(() =>
{
    try
    {
        var val = "value";
    }
    catch { /* gulp */ }
    finally
    {
        InvokeOnMainThread(() =>
        {
            HideSpinner();
        });

    }
});

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