POST 数据使用 HttpClient

Question

我正在尝试 POST 使用 HttpClient 将数据传输到网络，但我无法成功。

这是我的 JSON 网站 api

{
    "Categories":[
        {
            "CategoryID":1,
            "Category":"Category 1"
        },
        {
            "CategoryID":2,
            "Category":"Category 2"
        }
    ]
}

我正在将类别数据发送到网络，我的网络开发人员在上面发送给我 json 以将数据从 winform 发送到网络

这是我的代码

IEnumerable<KeyValuePair<string, string>> paramt = new List<KeyValuePair<string, string>>()
                {
                    new KeyValuePair<string,string>("CategoryID","1"),
                    new KeyValuePair<string,string>("Category","Pizza")
                };
                HttpContent q = new FormUrlEncodedContent(paramt);
                using (HttpClient client = new HttpClient())
                {
                    client.DefaultRequestHeaders.Accept.Clear();
                    client.BaseAddress = new Uri(url);
                    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", api);
                    HttpResponseMessage response = client.PostAsync("api/categories", q).Result;
 }

抱歉我的英语版主请更新我的问题

Answer 1

谢谢@John 在你的帮助下我做到了

public class CategoryItem
        {
            public int CategoryID { get; set; }
            public string Category { get; set; }
        }

        public class CategoriesRoot
        {
            public IList<CategoryItem> Categories { get; set; }
        }

         var tmp = new CategoriesRoot
                {
                    Categories = new List<CategoryItem> {
                    new CategoryItem { CategoryID = 1, Category = "Pizza" }
                }
                };

                using (HttpClient client = new HttpClient())
                {
                    client.DefaultRequestHeaders.Accept.Clear();
                    client.BaseAddress = new Uri(url);
                    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", api);
                    HttpResponseMessage response = client.PostAsJsonAsync("api/categories", tmp).Result;
                    }

POST 数据使用 HttpClient

POST data using HttpClient

c#

json

httpclient

httpcontent