输入“System.Web.HttpRequest”无法序列化
我正在尝试在网站中设计图片上传功能。 我正在使用 ASP.NET 3.5、C# 和 WCF。
我被要求完成以下任务：
1) 将上传器设为 Web 服务
2) 在文件上传时向用户返回进度更新。
3) 在数据库中记录其他相关的用户选择的选项。
因此，我首先使用以下命令创建一个 WCF Web 客户端 下面的服务合同：
IService.UploadPictures(HttpRequest request);
private UploadServiceClient upload;
protected void Page_Load(object sender, EventArgs e)
{
upload = new UploadServiceClient();
upload.UploadPictures(Request.Files);
}
当我编译时，出现以下错误：
类型“System.Web.HttpRequest”不能 被连载。考虑标记一下 使用 DataContractAttribute，并且 标记您想要的所有成员 连载于 DataMemberAttribute 属性。
所以，我重新签订了我的服务合同 将 [OperationContract] 更改为 [DataContract] 但更改产生了相同的错误。
有人可以告诉我我做错了什么吗 并举例说明如何最好地向前推进？
感谢您抽出时间。
I am trying to design an Picture Upload feature into a web site.
I am using ASP.NET 3.5, C#, and WCF.
I have been asked to accomplish the following:
1) Make the Uploader a Web Service
2) Return progress updates to the user as files are uploaded.
3) Log other relevant user-selected options in the database.
So, I have started off by creating a WCF web client with the
below service contract:
IService.UploadPictures(HttpRequest request);
private UploadServiceClient upload;
protected void Page_Load(object sender, EventArgs e)
{
upload = new UploadServiceClient();
upload.UploadPictures(Request.Files);
}
When I compile, I get the below error:
Type 'System.Web.HttpRequest' cannot
be serialized. Consider marking it
with the DataContractAttribute, and
marking all of its members you want
serialized with the
DataMemberAttribute attribute.
So, I went back into my service contract and
changed [OperationContract] to [DataContract]
but the change produced the same error.
Can somebody kindly tell me what I am doing wrong
and provide examples as to how to best move forward?
Thanks for your time.
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您不能使用 HttpRequest 之类的内容作为 WCF 参数。错误消息说明了一切 - HttpRequest 不可序列化，并且为了与 WCF 一起使用，类型必须可序列化。
另外，您需要记住：您不只是将对象实例传递给此处的方法 - 您真正要做的是让 WCF 运行时将您的请求（要调用的方法名称加上所有传入的参数）序列化为消息（例如：电子邮件或 xml 文件），将其发送到服务器，在那里反序列化并构建给定数据类型的新副本（如 DataContract 中所定义），然后对其执行某些操作。
您的 WCF 服务很可能是自托管的，例如在 NT 服务或控制台应用程序中运行 - 在这些情况下没有 HttpRequest 可用！
您确实需要重新架构您的解决方案 - 您需要检查 WCF 流以将文件上传到 WCF（谷歌搜索 - 您会发现很多点击），或者您需要找到另一种方法来传递相关信息（例如文件名列表）到 WCF 服务，而不使用 HttpRequest 对象。
马克
You cannot use something like a HttpRequest as a WCF parameter. The error messages says it all - the HttpRequest is not serializable, and in order to work with WCF, types have to be serializable.
Also, you need to remember: you're not just passing an object instance to a method here - what you're really doing is having the WCF runtime serialize your request (the method name to call plus all the parameters passed in) into a message (think: e-mail or xml file), sending it to the server, deserialising there and building up a new copy of the given datatype (as defined in your DataContract), and doing something with it.
Your WCF service could well be self-hosted, e.g. running in a NT Service or console app - no HttpRequest available in those circumstances!
You need to definitely rearchitect your solution - you need to either check into WCF streaming to upload files to WCF (google for it - you'll find plenty of hits) or you'll need to find another way to pass the relevant info (e.g. list of filenames) to the WCF service without use of a HttpRequest object.
Marc
您正在将请求作为请求的参数提交。这不是你想做的。我假设“Request.Files”是一个文件数组。这就是您要上传的内容。所以像这样：
You are submitting a request as a parameter to a request. This is not what you want to do. I'm assuming that "Request.Files" is an array of files. This is what you want to upload. So something like: