将Java Arraylist返回值从Java WebService转换为C＃Arraylist

Question

In my C# program, I would like to consume the Java Web Service Method which replies the java.Util.ArrayList. I don't know how to convert the Java ArrayList to C# ArrayList.

This is Java Codes

@WebMethod
@WebResult(name = "GetLastMessages")
@SuppressWarnings("unchecked")
public ArrayList<Message> getLastMessages(@WebParam(name = "MessageCount")int count) {
    ....
            ....
    return messages;
}

This is C# Codes

MessagesService.MessagesService service = new MessagesService.MessagesService();
System.Collections.ArrayList arr = (System.Collections.ArrayList)service.getLastMessages(10);

I got the following Error in C#

Cannot convert type 'WindowsFormsApplication1.MessagesService.arrayList' to 'System.Collections.ArrayList'  

How can I cast these Java ArrayList to C# ArrayList

Answer 1

That is definitely not a Java class written with Web Service interoperability in mind (nor is it really that good of a Java method - it should be returning List, not ArrayList). If you can change it, try changing it to an array (return type: Message[]). Very easy to do, just change the return line to read:

  return messages.toArray(new Message[0]);

I think that will just lead you right back to SO asking what to do with that Message class (did I mention this was not written with Web Service interoperability in mind?), even assuming the array goes smoothly (it may not).

If you can't change the Java class, you are probably very out of luck, but you would have to call the web service and get the raw XML and see what you can do about parsing it to know what your options are.

Answer 2

Java中的ArrayList和C＃中的ArrayList是非常不同的东西，您需要以一种双方都可以轻松理解的格式（例如XML）共享数据。