如何在C#中用表单数据构造HttpClient POST请求？

HttpClient client = new HttpClient();

var formData = new List<KeyValuePair<string, string>>();
formData.Add(new KeyValuePair<string, string>("key1", "value1"));
formData.Add(new KeyValuePair<string, string>("key2", "value2"));

HttpContent content = new FormUrlEncodedContent(formData);

var response = await client.PostAsync("http://example.com/api", content);
var responseContent = await response.Content.ReadAsStringAsync();