how to send multipart/form-data in web services that c#?

Question

how to read multipart/form-data in web services? i am send data using postman body form-data but postman is getting error.

    public class Api : System.Web.Services.WebService
    {
        [WebMethod(EnableSession = true)]
        [ScriptMethod(ResponseFormat=ResponseFormat.Json)]
        public string Hell(string name)
        {
            return CommonUtilities.GetJSonSerialized(name);
        }
    }

error System.InvalidOperationException: Request format is invalid: multipart/form-data; boundary=----WebKitFormBoundary79Ky1A1Kfyyy7qUi. at System.Web.Services.Protocols.HttpServerProtocol.ReadParameters() at System.Web.Services.Protocols.WebServiceHandler.CoreProcessRequest()

that error have getting by postman.

enter image description here

Answer 1

Asmx file can also be used for rest api creation (Which is not the recommended approach).

This can be achieved by the below code snippet.

[ScriptService]
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

public class Randezvous : WebService
{
    [WebMethod]
    [ScriptMethod(UseHttpGet = true, ResponseFormat = ResponseFormat.Json)]
    public void getUnitPersonels(string user, string pass, decimal unitNo)
    {
        JavaScriptSerializer serializer = new JavaScriptSerializer();
        Context.Response.Clear();
        Context.Response.ContentType = "application/json";
        #region ..:: Kullanıcı şİfre Kontrol ::..
        if (!(unit == "xxx" && pass == "yyy"))
        {

            string msg = "User or pass is wrong.";
            Context.Response.Write(serializer.Serialize(msg));
            return;
        }
        #endregion

        List<Personels> personels = _units.getUnitPersonels(unitNo);

        string jsonString = serializer.Serialize(personels);
        Context.Response.Write(jsonString);
    }
}

You can test this code in c# with the code that is shown below:

using (var client = new HttpClient())
{
    client.DefaultRequestHeaders.Accept.Clear();
    client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

    var builder = new UriBuilder("http://localhost:18511/Randezvous.asmx/getUnitPersonels");
    var query = HttpUtility.ParseQueryString(builder.Query);
    query["unitNo"] = "0";
    builder.Query = query.ToString();
    string url = builder.ToString();

    var result = Task.FromResult(client.GetAsync(url).Result).Result.Content;
    var resultJson = result.ReadAsStringAsync().Result;

}