无法使任务<HttpResponseMessage>"等待"

Question

我正在尝试在我的web api包装器中编写一个方法.我想使用"async/await"功能,以便UI不会被阻止.下面是web api包装器中的代码片段.

    public static async Task Get<T>(Dictionary<string, string> paramDictionary, string controller)
    {
        try
        {
            string absoluteUrl = BaseUrl + controller + "?";
            absoluteUrl = paramDictionary.Aggregate(absoluteUrl,
                (current, keyValuePair) => current + (keyValuePair.Key + "=" + keyValuePair.Value + "&"));
            absoluteUrl = absoluteUrl.TrimEnd('&');

            using (HttpClient client = GetClient(absoluteUrl))
            {
                HttpResponseMessage response = await client.GetAsync(absoluteUrl);
                return await response.Content.ReadAsAsync<T>();
            }
        }
        catch (Exception exception)
        {
            throw exception;
        }
    }

问题是我在下面的语句中遇到编译器错误.

HttpResponseMessage response = await client.GetAsync(absoluteUrl);

它说"Type System.Threading.Tasks.Task <System.Net.Http.HttpResponseMessage> is not awaitable".经过多次搜索后,我无法摆脱这个错误.我出错的任何想法？请帮忙.

Answer 1

据我所知,这是因为你的方法返回Task,而不是Task<T>.所以你做不到return await response.Content.ReadAsAsync<T>().更改签名以返回Task<T>:

public static async Task<T> Get<T>(...)