使用 JSON 正文傳送非同步 HTTP POST 請求

public static async Task PostAsync(this Uri uri, object value)
{
    var content = new ObjectContext(value.GetType(), value, new JsonMediaTypeFormatter());

    using (var client = new HttpClient())
    {
        return await client.PostAsync(uri, content);
    }
}

. . .

var uri = new Uri("http://stackoverflow.com/documentation/c%23/1971/performing-http-requests");
await uri.PostAsync(new { foo = 123.45, bar = "Richard Feynman" });