c# - 想要将对象从 MVC Controller 传递到 Web api Controller

Question

这是我的 MVC Controller 代码。

[HttpPost]
public async Task<IActionResult> InsertNewStudentAsync(ViewModel.StudentPersonalDetailsViewModel ob)
{
    StudentModel obj = ViewModel.StudentPersonalDetailsViewModel.Translate(ob);
    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri("http://localhost:52494/");
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        var bodyData = ViewModel.StudentPersonalDetailsViewModel.Translate(ob);

        //HttpContent ob = new HttpContent();
        var response = await client.PostAsync("api/Student/InsertStudent",obj);
    }
    return View();
}

在行 var response = wait client.PostAsync("api/Student/InsertStudent",obj);

它向我显示了 obj 上的一个错误，表明

Error CS1503 Argument 2: cannot convert from 'SMS.Domain.Models.StudentModel' to 'System.Net.Http.HttpContent'

如何将该对象传递给我的 API Controller 。

Answer 1

这是因为它需要 HttpContent 派生类。

使用PostAsJsonAsync扩展方法

var response = await client.PostAsJsonAsync("api/Student/InsertStudent",obj);

或者自己转换

var json = JsonConvert.SerializeObject(obj); 
var content = new StringContent(json, Encoding.UTF8, "application/json");
var response = await client.PostAsync("api/Student/InsertStudent", content);

这基本上就是扩展方法在幕后所做的事情。

如果您不想添加额外的依赖项，这里是滚动您自己的扩展方法的示例。

public static Task<HttpResponseMessage> PostAsJsonAsync<T>(this HttpClient client, string requestUri, T obj) {
    var json = JsonConvert.SerializeObject(obj); 
    var content = new StringContent(json, Encoding.UTF8, "application/json");
    return client.PostAsync(requestUri, content);    
}