消耗.net中的Rest API时出错

Question

I'm trying to consume a rest API but I'm getting the next error:

Exception Details: Newtonsoft.Json.JsonException: Unexpected JSON token while reading DataTable: StartObject

also, if changing endpoint I get: System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown

which is pointing to this line of code:

var table = Newtonsoft.Json.JsonConvert.DeserializeObject<System.Data.DataTable>(data);

not really sure how to fix it? Anyone can spot what the error is or how to fix it?...

thanks..

My controller is:

public async System.Threading.Tasks.Task<ActionResult> About()
    {
        string url = "https://restcountries.eu/rest/v1/region/africa";

        using (System.Net.Http.HttpClient client = new System.Net.Http.HttpClient())
        {
            client.BaseAddress = new Uri(url);
            client.DefaultRequestHeaders.Accept.Clear();
            client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));

            System.Net.Http.HttpResponseMessage response = await client.GetAsync(url);
            if (response.IsSuccessStatusCode)
            {
                var data = await response.Content.ReadAsStringAsync();
                var table = Newtonsoft.Json.JsonConvert.DeserializeObject<System.Data.DataTable>(data);

                System.Web.UI.WebControls.GridView gView = new System.Web.UI.WebControls.GridView();
                gView.DataSource = table;
                gView.DataBind();
                using (System.IO.StringWriter sw = new System.IO.StringWriter())
                {
                    using (System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(sw))
                    {
                        gView.RenderControl(htw);
                        ViewBag.ReturnedData = sw.ToString();
                    }
                }
            }
        }
        return View();

Answer 1

You shouldn't be deserializing into a DataTable . A DataTable is a generic, in-memory representation of some relational data. With the following deserialization lines of code you have:

var data = await response.Content.ReadAsStringAsync();
var table = Newtonsoft.Json.JsonConvert.DeserializeObject<System.Data.DataTable>(data);

you are asking your .NET code to go grab some data from the internet and turn that string of data into an in-memory representation of relational data, when, at this point, it's really only a string of characters.

You should create a model of a country with the properties that are returned from the API you're querying.

You can then deserialize that data and play with it in .NET by doing something like the following:

Newtonsoft.Json.JsonConvert.DeserializeObject<IList<MyCountryModel>>(data);

Answer 2

After reading the comments I got to solve the model problem and defined it like this,....thanks

public class Log2
{
    public string error { get; set; }
    public Log3[] Logs { get; set; }
}

 public class Log3
{
    public string ProdLoggerIdx { get; set; }
    public string OfficeID { get; set; }
    public string Agent { get; set; }
    public string CommandSent { get; set; }
    public string HostResponse { get; set; }
    public string CommandSentDate { get; set; }
    public string CommandReceivedDate { get; set; }

}