将 JSON 从 HttpClient 发布到 web API 在 ZD7EFA19FBE7D3972FD4ADB6024Z223D

Question

I'm trying to POST a JASON data from HttpClient to my REST API,but it's not working. the client and the Rest API are not in the same project/solution.

on the HttpClient i'm using the following code:

 private static async void DoIt()
    {
        string payload = JsonConvert.SerializeObject(new
        {
            agent = new
            {
                Id = 3,
                Text = "Test item3",
            },

           
        });

        var client = new HttpClient();
        var content = new StringContent(payload, Encoding.UTF8, "application/json");

        HttpResponseMessage response = await client.PostAsync("https://localhost:44323/api/listid", content);


    }

the model on the REST API:

public class CustomListItem
{
    public int Id { get; set; }
    public string Text { get; set; }

}

the POST method on REST API:

 public HttpResponseMessage Post([FromBody] CustomListItem model)
    {
        if (string.IsNullOrEmpty(model?.Text))
        {
            return Request.CreateResponse(HttpStatusCode.BadRequest);
        }
        var maxId = 0;
        if (_listItems.Count > 0)
        {
            maxId = _listItems.Max(x => x.Id);
        }
        model.Id = maxId + 1;
        _listItems.Add(model);
        return Request.CreateResponse(HttpStatusCode.Created, model);
    }

can you please help?

Answer 1

What Hamlet is referring to is that you are generating JSON like this:

{
    agent: {
        Id: 3,
        Text: "Test item3"
    }
}

But your API is expecting just this:

{
    Id: 3,
    Text: "Test item3"
}

So you need to change your code to:

string payload = JsonConvert.SerializeObject(new
    {
        Id = 3,
        Text = "Test item3",
    };