回调应该在不同的线程上调用吗?使用此代码:
client.ExecuteAsync<List<IngredientDto>>(request, Response =>
{
textBox1.Text += Response.Data.Count;
});
我得到一个“InvalidOperationException”:
“调用线程无法访问此对象,因为不同的线程拥有它。”
回调不应该在 UI 线程上,还是我错了?
回调应该在不同的线程上调用吗?使用此代码:
client.ExecuteAsync<List<IngredientDto>>(request, Response =>
{
textBox1.Text += Response.Data.Count;
});
我得到一个“InvalidOperationException”:
“调用线程无法访问此对象,因为不同的线程拥有它。”
回调不应该在 UI 线程上,还是我错了?
实际上,如果您查看源代码,您会看到
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.
});
}
这导致:您无法从非 ui 线程更新 ui 对象。在 WPF 的情况下,您可以使用Dispatcher
client.ExecuteAsync<List<IngredientDto>>(request, Response =>
{
Dispatcher.Invoke((Action)() => {textBox1.Text += Response.Data.Count;});
});
在一般情况下,请参阅同步上下文