场景

Winform中怎样使用HttpClient调用http的get和post接口并将接口返回json数据解析为实体类：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/124157296

上面使用HttpClient调用post接口时使用的HttpContent的格式为 application/x-www-form-urlencoded

对应的代码实现

                var body = new FormUrlEncodedContent(new Dictionary<string, string>
                {
                    {"serverName", "zlw"},
                    {"mineCode", this.textBox_mineCode.Text.Trim().ToString()},
                    {"targetServer",this.textBox_targetServer.Text.Trim().ToString()},
                    {"port", this.textBox_port.Text.Trim().ToString()},
                    {"user", this.textBox_user.Text.Trim().ToString()},
                    {"pass", this.textBox_pass.Text.Trim().ToString()},
                    {"dir", this.textBox_dir.Text.Trim().ToString()},
                    {"filePath", this.textBox_filePath.Text.Trim().ToString()},
                });
                // response
                var response = httpClient.PostAsync(url, body).Result;

如果调用接口时明确指出必须是application/json格式，则需要修改代码实现方式。

注：

博客：
https://blog.csdn.net/badao_liumang_qizhi

实现

1、以调用若依框架的登录接口为例，需要传递application/json的用户名和密码参数

这里为快速实现，所以手动构造和转义json字符串

var jsonContent = "{\"username\":\"bGVk\",\"password\":\"MTIzNDU2Nzg=\"}";

实际使用时需要使用正规的json序列化工具等方式。

然后content不再是FormUrlEncodedContent，而是StringContent

var content = new StringContent(jsonContent, Encoding.UTF8, "application/json")

然后传参时

var response = httpClient.PostAsync(url, content).Result;

2、完整示例代码

            var httpClient = new HttpClient();
            var url = new Uri("http://127.0.0.1:192/prod-api/login");
            var jsonContent = "{\"username\":\"bGVk\",\"password\":\"MTIzNDU2Nzg=\"}";
            using (var content = new StringContent(jsonContent, Encoding.UTF8, "application/json"))
            {
                var response = httpClient.PostAsync(url, content).Result;
                if (response.IsSuccessStatusCode)
                {
                    var responseContent = response.Content.ReadAsStringAsync();
                    var data = responseContent.Result;
                    Console.WriteLine(data);
                    JavaScriptSerializer js = new JavaScriptSerializer();//实例化一个能够序列化数据的类
                    LoginResult result = js.Deserialize<LoginResult>(data);
                    Console.WriteLine(result.token);
                }
            } 

后面的部分则是读取返回值并序列化为实体类

其中实体类LoginResult为

    class LoginResult
    {
        /// <summary>
        /// 操作成功
        /// </summary>
        public string msg { get; set; }

        /// <summary>
        ///
        /// </summary>
        public int code { get; set; }

        /// <summary>
        ///
        /// </summary>
        public string token { get; set; }
    }

测试结果