How do I set up HttpContent for my HttpClient PostAsync for dropbox api

[le h.]

HttpClient client = new HttpClient();
client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("Bearer", oauthToken);

HttpResponseMessage response = await client.PostAsync(link,/*what is it???*/);
response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
return await response.Content.ReadAsStringAsync();

[Greg-DB]

It looks like you'e trying to call the API HTTPS endpoints directly using a third party HTTP client. As we didn't make the client, we can't help with it specifically, but we can try to offer some guidance on how to use the API.

For reference, the documentation for PostAsync indicates that the second parameter is:

content
    Type: System.Net.Http.HttpContent
    The HTTP request content sent to the server.

So, it looks like you need to construct and supply a HttpContent there. You didn't mention which API or endpoint you're trying to use, so you should refer to the relevant API documentation for the endpoint you're trying to see what the right values to send up are for your case.

[le h.]

Dropbox api require use "POST" method. so I use postAsync(). But httpConntent of dropbox for what? 

Ex: I want to get all information of account( i have a accesstoken)

link:https://api.dropboxapi.com/2/users/get_account?access_token=my token

The HTTP request content sent to the server.

[Greg-DB]

I'm not sure I understand your question. Can you clarify? Thanks in advance! 

Also, again (per your previous thread) note that you can't use an "access_token" URL parameter to pass up your access token to API v2. You can only use an "Authorization" header or an "authorization" URL parameter.