C#: HttpClient POST pass parameters - one string and int array

Question

I'm having some issues with calling an API. I need to send post data containing 2 things: an ID and an array of int. I have tried a lot of things, all resulting in errors or simply not sending data in the right way. All answers I found, do not handle the fact that I want to send 2 different data types.

On the other side I have:

Call<DefaultResponseList> someMethod(@Field("parm1") String parm1, @Field("parm2[]") ArrayList<Integer> parm2);

I tried:

List<int> ints1 = new List<int>();
ids.Add(1);
ids.Add(2);
ids.Add(3);

var values = new List<KeyValuePair<string, object>>
{
    new KeyValuePair<string, object>("parm1", "lkdjfowejfd123"),
    new KeyValuePair<string, object>("parm2", ints1)

};

var httpClient = new HttpClient(new HttpClientHandler());
HttpResponseMessage response = await httpClient.PostAsync(someUrl, new FormUrlEncodedContent(values));
response.EnsureSuccessStatusCode();

string data = await response.Content.ReadAsStringAsync();

You should know someUrl's environment and then arrange your values according to this information. Ex if target environment is a Apache/PHP server your keys should be like param2[], for classic ASP.NET envrionment values should have same key name with occurence, and if its ASP.NET MVC your key should contains indices like param2[0],param2[1] etc. — Cihan Uygun
– Cihan Uygun, Commented Sep 17, 2016 at 21:43

Miljkoyu · Accepted Answer · 2016-09-19 16:19:34Z

5

I solved the problem. Thanks to Cihan Uygun for his comments.

List<int> ids = new List<int>();
ids.Add(1);
ids.Add(2);
ids.Add(3);

var values = new List<KeyValuePair<string, string>>
{
    new KeyValuePair<string, string>("parm1", "lkdjfowejfd123")
};

int counter = 0;
foreach (int i in ids)
{
    values.Add(new KeyValuePair<string, string>("parm2[" + counter.ToString() + "]", i.ToString()));
    counter++;
}

var httpClient = new HttpClient(new HttpClientHandler());
HttpResponseMessage response = await httpClient.PostAsync(urlSaveRegions, new FormUrlEncodedContent(values));
response.EnsureSuccessStatusCode();

string data = await response.Content.ReadAsStringAsync();

answered Sep 19, 2016 at 16:19

Miljkoyu

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MKK · Accepted Answer · 2018-07-11 13:20:23Z

0

Post an integer array using StringContext

var myData = new { myvar = "my string", data = new[] {1,2,3,4,5}};

var httpClient = new HttpClient(new HttpClientHandler());

var jsonObject = JsonConvert.SerializeObject(myData)
var stringContent = new StringContent(jsonObject.ToString(), System.Text.Encoding.UTF8, "application/json");

HttpResponseMessage response = await httpClient.PostAsync(urlSaveRegions, stringContent);
response.EnsureSuccessStatusCode();

string data = await response.Content.ReadAsStringAsync();

answered Jul 11, 2018 at 13:20

MKK

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