Use WebService for data integration between systems

1. recently, we have developed a small system that requires data integration with the original system. At first, I wanted to directly access the database, but later I felt that this method was too coupled, So I abandoned it. After testing, we feel that using WebService to capture data from the parent system in real time, generate XML data, or directly insert data into the relevant database can solve this problem. WebService is mainly service-oriented and provides specific functions. A major feature of integrating SOAP, WSDL, XML, HTTP, and UDDI technologies is to achieve data intercommunication between heterogeneous systems. I also encountered some minor problems in the use process. I would like to share with you:
   1. . in net, the WS class must first inherit "system. web. services. "WebService". For specific methods, you need to add the "[webmethod]" tag. For details, see helloworld
   2. if you do not have strict permissions on WS during the writing process, you can directly use ps. credentials = system. net. credentialcache. defaultcredentials;

implement ws call.
3. if the webmethod returns objects, you must note that ws can only return serializable objects, and the details are as follows: if the attributes in the transmission class have statci, readonly, const, these attributes are not available for data transmission
4. for WebService deployment, the program can be directly put together with the code at the presentation layer, without increasing the cost of subordinates.
5. to put it simply, how to use a ws directly reference the URL of your published ws to start a name WS1, then you can directly reference the application in the Program , ws1.yourwebmehtodd .....