列表显示为空白时,在“剃刀页”上为空

时间:2019-07-02 07:37:07

标签: c# asynchronous razor-pages

我从一个创建列表的API中获取了一些数据,但是当我尝试在.cshtml文件中循环浏览列表时,它什么也没有显示,并且列表的计数为0。但是当我循环浏览时它确实显示结果的OnGetAsync()方法中的列表。

我尝试了不启用异步功能,并尝试在getDataAsync()方法中填充列表。

        public IList<Employee> Employee = new List<Employee>();

        public async void OnGetAsync()
        {
            // Sets up HttpClient
            await RunAsync();

            // API call method which returns a list filled with the results
            Employee = await GetDataAsync("api-url");

            // Shows Results!
            foreach (var item in Employee)
            {
                Debug.WriteLine(item.name);
            }
        }
static async Task<List<Employee>> GetDataAsync(string path)
        {
            string data = null;
            List<Employee> list = new List<Employee>();
            HttpResponseMessage response = await client.GetAsync(path);
            if (response.IsSuccessStatusCode)
            {
                data = await response.Content.ReadAsStringAsync();
            }
            JObject json = JObject.Parse(data);

            // Get the only the data i need from the entire json api result
            foreach (var d in json["data"])
            {
                string setId;
                string setName;
                string setUrl;


                if (d["id"] == null)
                {
                    setId = "NA";
                } else
                {
                    setId = d["id"].ToString();
                }

                if (d["person"]["full_name"] == null)
                {
                    setName = "NA";
                } else
                {
                    setName = d["person"]["full_name"].ToString();
                }

                if (d["avatar"]["url_small"] == null)
                {
                    setUrl = "NA";
                } else
                {
                    setUrl = d["avatar"]["url_small"].ToString();
                }

                list.Add(new Employee
                {
                    id = setId,
                    name = setName,
                    avatar_url = setUrl
                });
            }
            Debug.Unindent();
            return list;
        }
        <!-- Shows 0 -->
        <p>@Model.Employee.Count</p>
        <!-- Shows nothing -->
        @foreach (var item in Model.Employee)
        {
           <p>@Html.DisplayFor(modelItem => item.name)</p>
        }

我希望能够遍历列表并在网页上显示结果,而不是列表的计数为0,并且什么都没有显示。

1 个答案:

答案 0 :(得分:1)

代码中的问题是OnGetAsync是一个异步方法,当您返回Task时应该返回void

只需更改其返回类型。

public async Task OnGetAsync() 
{
    // Your code here
}