ASP.NET通过Remoting service上传文件的实例详解

巴扎黑
Release: 2017-05-21 18:34:08
Original
1190 people have browsed it

最近在因为在学习Remoting,纯粹只是了解一下,发现Remoting确实是好东西。

我们通常有三种方式来使用remoting,一种是

第一种:Publishing a public object
公开的对象创建在本地
第二种:Remote creation of a public object (SAO)
对象创建在客户端请求中
第三种:Remote creation of a private object (CAO)
对象创建在HOST上,客户端引用服务器上的对象

目次我也没有很好理解这三种的本质区别在哪里。而这三种方式的remoting创建方式也不相同。

第一种方式
Host:
ChannelServices.RegisterChannel (new TcpChannel(1500));
cTransfer Trans = new cTransfer();
RemotingServices.Marshal (Trans, "TestService");Client:
cTransfer T = (cTransfer) Activator.GetObject(typeof(cTransfer),
                                 "tcp://host:1500/TestService");
第二种方式
Host:
ChannelServices.RegisterChannel (new TcpChannel(1500));
RemotingConfiguration.RegisterWellKnownServiceType(typeof(cTransfer),
    "TestService", WellKnownObjectMode.Singleton);Client:
cTransfer T = (cTransfer) Activator.GetObject(typeof(cTransfer),
                                 "tcp://host:1500/TestService");
第三种方式
Host:
ChannelServices.RegisterChannel (new TcpChannel(1500));
RemotingConfiguration.RegisterActivatedServiceType(typeof(cTransfer));Client:
object[] attr = {new UrlAttribute("tcp://host:1500")};
object[] args = {"Sample constructor argument"};
cTransfer T = (cTransfer) Activator.CreateInstance(typeof(cTransfer), args, attr);
如果我们需要一个对象(object)允许远程调用处理,那么这个对象(object)需要继承于MarshalByRefObject这个类。

如何在remoting中传送文件呢?基本思路就是在client打开client的文件,转换在Byte[]类型之后调用host的对象。
Client与Host之间传送的对象
[Serializable]
    public struct kAction
    {
        public string filename;
        public byte[] context;       

    };打开文件,将流字节保存到Context中去
Stream  fileStream=File.Open(this.transFileName.Text,FileMode.Open);
            fileStream.Position=0;
            byte[] Content = new byte[((int) fileStream.Length) + 1];
            fileStream.Read(Content,0,Content.Length) ;
在Host在读取到Kaction之后,把它保存到指定文件夹下面
MemoryStream meoeryStream=new MemoryStream(k_Action.context);
            FileStream fileStream=new FileStream(@"d:\"+k_Action.filename,FileMode.Create);
            meoeryStream.WriteTo(fileStream);
            fileStream.Close();
            meoeryStream.Close();           
发现不能在对象中又定义新的对象。在准备发送到HOST上会提示“包含潜在危险的类型”。
[Serializable]
    public struct kAction
    {
        public string filename;
        public byte[] context;
                public FineInfo fileInfo;//这里

    };
记录一下自己的心得。有空我会好好整理下下回做篇完整点的。

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