Post fields and a file using the new System.Net.WebClient

问题

i'm trying to invoke a webapi with the new System.Net.WebClient and didnot found any special examples.

The goal is simulate a traditional form post with some fields and a file.

how can i do it using the System.Net.WebClient or where can i find some examples?

thanks in advance

回答1:

I think you need this:

http://dzimchuk.net/post/uploading-a-file-over-http-in-net

This is a very well written blog. See the last example.

回答2:

There are a lot of examples if you do a fast google search, anyway, here goes some samples:

Simple GET

WebClient webClient = new WebClient();
webClient.Headers["Accept"] = "application/json"; //setting headers

string json = webClient.DownloadString(url);

Simple POST

NameValueCollection values = new NameValueCollection();
values["user"] = username;
values["pwd"] = password;
webClient.UploadValues(url, values);

There's also an UploadData that sends byte arrays and UploadFile that allows you to upload files directly from disk.

来源：https://stackoverflow.com/questions/24738839/post-fields-and-a-file-using-the-new-system-net-webclient