为什么Web服务引用和服务引用的结果不同？

Question

I am bit curious about one thing which has happen while trying to understand the concept of Service References and Web Service References .

What I did is?

In my project I have added a web service as a Service Reference and trying to get my script run through the use of client. But while getting result it is throwing an exception as in the following image:

I have tried to trace out the cause but not able to get the proper answer for that. I have following code for the resultant object.

[
        ComVisible(false), 
        Serializable,
        SoapTypeAttribute("RecordList", "http://www.someadd.com/dev/ns/SOF/2.0"),       
        XmlType(TypeName="RecordList", Namespace="http://www.someadd.com/dev/ns/SOF/2.0")       
    ]
    public class MyRecordListWrapper
    {
        private IxRecordList recordList = null;
        private const string XMLW3CSchema = "http://www.w3.org/2001/XMLSchema";

        [SoapElement("Headers")]
        public Header[] Headers = null;
        [SoapElement("Records")]
        public Record[] Records = null;
        // some methods to work on intialization
        public SmRecordListWrapper(ref IxRecordList p_RecordList)
        {
            recordList = p_RecordList;// record list initialization             
            Headers = CreateWrapperHeaders(); // will return header class object
            Records = CreateWrapperRecords(); // will return record object
        }   
    }

Can anyone tell me why this error is showing for me?

While adding reference as a Web Service Reference when I add the same reference as a web reference that time the program is not showing any error and runs successfully?

So can anyone tell me what is the difference in working with the same code using service reference and web service reference? and Which is a correct way to ass references?

Hope I will get some more described answers to make the things easy to understand.

Thanks in advance.

Answer 1

Adding a web reference, visual studio uses xsd.exe to generate the classes from the service metadata. This uses XmlSerializer under the hood.

Adding a service reference, visual studio uses svcutil.exe to generate the classes from the metadata. This uses DataContractSerializer under the hood.

Two separate tools, two outcomes. For general information, DataContractSerializer is a lot less forgiving when it comes to generating classes from metadata.