c# WebClient Get Post 方法

public string GetData(string url)
        {
            string data;
            using (var client = new WebClient())
            {
                using (var stream = client.OpenRead(url))
                {
                    using (var reader = new System.IO.StreamReader(stream))
                        data = reader.ReadToEnd();
                }
            }
            return data;
        }

 public string PostData(string url, string postData)
        {
            byte[] bytes = Encoding.UTF8.GetBytes(postData);
            string data;
            using (var client = new WebClient())
            {
                client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
                client.Headers.Add("ContentLength", postData.Length.ToString());
                byte[] responseData = client.UploadData(url, "POST", bytes);
                return Encoding.UTF8.GetString(responseData);// 解码  
            }
        }