1) Return type is simple type, such as simple type, int, string, etc. 2) Return type is Structural 3) Return type is the object of the class 4) Return type is the reason for the array, only the above can be Vs.Net Analyze the standard XML document so that in J2EE, it can be easily called without re-analyzing. Note: It is best to return to the result. If Microsoft's DataSet is a XSD specification, while trying to customize WebService when customizing WebService. If it is just .NET, use Dataset . If it is a heterogeneous platform such as J2EE or Flash, it is best not to use DataSet, very troublesome, to analyze yourself, remember! Therefore, it is best to use ORM technology on the architecture to return an object.
