C# - Body content in POST request

Question

I need to make some api calls in C#. I'm using Web API Client from Microsoft to do that. I success to make some POST requests, but I don't know how to add the field "Body" into my requests. Any idea ? Here's my code:

 static HttpClient client = new HttpClient(); public override void AwakeFromNib() { base.AwakeFromNib(); notif_button.Activated += (sender, e) => { }; tips_button.Activated += (sender, e) => { Tip t1 = new Tip(title_tips.StringValue, pic_tips.StringValue, content_tips.StringValue, "TEST"); client.BaseAddress = new Uri("my_url"); client.DefaultRequestHeaders.Accept.Clear(); client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); CreateProductAsync(t1).Wait(); }; } static async Task<Uri> CreateProductAsync(Tip tips) { HttpResponseMessage response = await client.PostAsJsonAsync("api/add_tips", tips); response.EnsureSuccessStatusCode(); return response.Headers.Location; }

John Wu · Accepted Answer · 2017-09-04 21:41:32Z

Step 1. Choose a type that derives from HttpContent. If you want to write a lot of content with runtime code, you could use a StreamContent and open some sort of StreamWriter on it. For something short, use StringContent. You can also derive your own class for custom content.

Step 2. Pass the content in a call to HttpClient.PostAsync.

Here's an example that uses StringContent to pass some JSON:

string json = JsonConvert.SerializeObject(someObject); var httpContent = new StringContent(json, Encoding.UTF8, "application/json"); var httpResponse = await httpClient.PostAsync("http://www.foo.bar", httpContent);

See also How do I set up HttpContent?.

Thans for your answer. I think I didn't understood well. In fact, I replace in your code "someObject" by "tips", but it still doesn't work. Can you explain it or detail it ? I need to post headers and body. Thanks a lot

Baptiste · Accepted Answer · 2017-09-06 14:45:42Z

Thanks to this and this, I finally found the solution to send post requests with headers AND body content. Here's the code:

 var cl = new HttpClient(); cl.BaseAddress = new Uri("< YOUR URL >"); int _TimeoutSec = 90; cl.Timeout = new TimeSpan(0, 0, _TimeoutSec); string _ContentType = "application/x-www-form-urlencoded"; cl.DefaultRequestHeaders.Add(key, value); cl.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue(_ContentType)); cl.DefaultRequestHeaders.Add("key", "value"); cl.DefaultRequestHeaders.Add("key", "value"); var _UserAgent = "d-fens HttpClient"; cl.DefaultRequestHeaders.Add("User-Agent", _UserAgent); var nvc = new List<KeyValuePair<string, string>>(); nvc.Add(new KeyValuePair<string, string>("key of content", "value")); var req = new HttpRequestMessage(HttpMethod.Post, "http://www.t-lab.fr:3000/add_tips") { Content = new FormUrlEncodedContent(nvc) }; var res = cl.SendAsync(req);

List<KeyValuePair<string, string>>(); could be a dicionary var payload = new Dictionary<string,string>() { {"grant_type", GoogleAuthGrantType}, {"assertion", googleAuthJwt} };

arthur · Accepted Answer · 2019-12-01 09:27:48Z

a little more understandable

using (var client = new HttpClient()) { client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/x-www-form-urlencoded")); client.DefaultRequestHeaders.Add("Accept", "*/*"); var Parameters = new List<KeyValuePair<string, string>> { new KeyValuePair<string, string>("Id", "1"), }; var Request = new HttpRequestMessage(HttpMethod.Post, "Post_Url") { Content = new FormUrlEncodedContent(Parameters) }; var Result = client.SendAsync(Request).Result.Content.ReadAsStringAsync(); }

Collectives™ on Stack Overflow

C# - Body content in POST request

3 Answers 3

1 Comment

1 Comment

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

1 Comment

Comments

Linked

Related