Question

是否应该在不同的线程上调用回调？使用此代码：

client.ExecuteAsync<List<IngredientDto>>(request, Response =>
    {
        textBox1.Text += Response.Data.Count;
    });

我收到“InvalidOperationException”：

“调用线程无法访问此对象，因为另一个线程拥有它。”

回调不应该在UI线程上，或者我错了吗？

Answer 1

实际上，如果你看一下源代码，你会看到

    public virtual RestRequestAsyncHandle ExecuteAsync<T>(IRestRequest request, Action<IRestResponse<T>, RestRequestAsyncHandle> callback)
    {
        return ExecuteAsync(request, (response, asyncHandle) =>
        {
            IRestResponse<T> restResponse = response as RestResponse<T>;
            if (response.ResponseStatus != ResponseStatus.Aborted)
            {
                restResponse = Deserialize<T>(request, response);
            }

            callback(restResponse, asyncHandle);//<--- this means that response & callback are executed at **same** thread.
        });
    }

这会导致：您无法从非ui线程更新ui对象。如果是WPF，您可以使用Dispatcher

client.ExecuteAsync<List<IngredientDto>>(request, Response =>
    {
        Dispatcher.Invoke((Action)() => {textBox1.Text += Response.Data.Count;});
    });

一般情况下，请参阅syncronization context

响应回调在另一个线程上

1 个答案: