如何使用HttpWebRequest来调用接受byte []参数的Web服务操作？

要使用HttpWebRequest调用接收byte[]参数的Web服务操作，请按照以下步骤操作：

创建一个HttpWebRequest对象，指定目标URL。

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://example.com/webservice");

设置请求方法为POST，并设置请求内容类型为application/octet-stream。

request.Method = "POST";
request.ContentType = "application/octet-stream";

将byte[]数据写入请求流。

byte[] data = new byte[] { 1, 2, 3, 4, 5 };
request.ContentLength = data.Length;
Stream requestStream = request.GetRequestStream();
requestStream.Write(data, 0, data.Length);
requestStream.Close();

获取服务器返回的响应流，并读取响应内容。

HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream responseStream = response.GetResponseStream();
StreamReader reader = new StreamReader(responseStream);
string responseData = reader.ReadToEnd();
reader.Close();
responseStream.Close();
response.Close();

处理响应数据。

Console.WriteLine(responseData);

完整的代码示例如下：

using System;
using System.IO;
using System.Net;

class Program
{
    static void Main(string[] args)
    {
        try
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://example.com/webservice");
            request.Method = "POST";
            request.ContentType = "application/octet-stream";

            byte[] data = new byte[] { 1, 2, 3, 4, 5 };
            request.ContentLength = data.Length;
            Stream requestStream = request.GetRequestStream();
            requestStream.Write(data, 0, data.Length);
            requestStream.Close();

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream responseStream = response.GetResponseStream();
            StreamReader reader = new StreamReader(responseStream);
            string responseData = reader.ReadToEnd();
            reader.Close();
            responseStream.Close();
            response.Close();

            Console.WriteLine(responseData);
        }
        catch (Exception ex)
        {
            Console.WriteLine("Error: " + ex.Message);
        }
    }
}

这样，您就可以使用HttpWebRequest调用接收byte[]参数的Web服务操作了。