在c＃中返回一次异步函数的列表<data>

Question

我有一个函数，它返回自动完成列表中的名称列表，并从Web服务获取数据：

public async Task<SelectResponse> AutoSearchService(string filter)
   {
        SelectResponse ResponseData = new SelectResponse();
        var Url = string.Format("{0}{1}", "http://url&", filter);
        var Client = new HttpClient();
        Client.BaseAddress = new Uri(Url.ToString());
        Client.DefaultRequestHeaders.Accept.Clear();
        Client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/xml"));
        var ResponseMessage = await Client.GetAsync(Url.ToString());
        if (ResponseMessage.IsSuccessStatusCode)
        {
            ResponseData = await ResponseMessage.Content.ReadAsAsync<SelectResponse>();
        }
        return ResponseData;
    }

这是AutoCompleteSearch：

private async Task<List<Autocomplete>> _GetSchool(string query)
    {
        var response = await AutoSearchService("");
        List<STVDPLMRECORDSELECT> searchFilter = response.SelectResult;
        List<Autocomplete> secondarySchools = new List<Autocomplete>();
        try
        {
            var results = (from s in searchFilter
                           where (s.STVDPLM_DESC).StartsWith(query)
                           select s).Take(10).ToList();
            foreach (var r in results)
            {
                // create objects
                Autocomplete schools = new Autocomplete();
                int i = 0;
                schools.Name =r.STVDPLM_DESC;
                schools.Id = i++ ;
                secondarySchools.Add(schools);
            }

        }
        catch (EntityCommandExecutionException eceex)
        {
            if (eceex.InnerException != null)
            {
                throw eceex.InnerException;
            }
            throw;
        }
        catch
        {
            throw;
        }
        return secondarySchools;
    }

每次输入任何字符后都需要很长时间才能获得自动完成列表，因此我需要在运行控制器后立即读取此异步Web服务列表，使其像静态列表一样。 请帮助解决这个问题。