客户端调用web api 的post请求，传入一个字符串时，用此方法获取此字符串。
byte[] byts = new byte[HttpContext.Current.Request.InputStream.Length]; HttpContext.Current.Request.InputStream.Read(byts, 0, byts.Length); string req = System.Text.Encoding.UTF8.GetString(byts);//编码类型按实际需求
byte[] byts = new byte[HttpContext.Current.Request.InputStream.Length]; HttpContext.Current.Request.InputStream.Read(byts, 0, byts.Length); string req = System.Text.Encoding.UTF8.GetString(byts);//编码类型按实际需求
