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        [WebMethod]
        [SoapInclude(typeof(MdbPropertyOfNullableInt32)), SoapInclude(typeof(MdbPropertyOfString))]
        public MdbGetObjectListReply GetObjectList(MdbGetObjectListRequest getObjectListRequest)
        {
            if (getObjectListRequest.Application.ApplicationId == 0 || getObjectListRequest.ObjectName == null || getObjectListRequest.Schema.SchemaId == 0 || getObjectListRequest.ServerInfo == null)
                throw new WsiException("Mandatory properties are not filled.");
            else
            {
                MdbGetObjectListReply objectListReply = new MdbGetObjectListReply(getObjectListRequest.ServerInfo);
                objectListReply.ObjectList = conn.GetObjectList(getObjectListRequest.Application, getObjectListRequest.Schema, getObjectListRequest.ObjectName, ticket.UserId);
                return objectListReply;
            }
        }					

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System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.InvalidOperationException: There was an error generating the XML document. ---> System.InvalidOperationException: The type Tooma.Provider.Db.dbobjects.MdbPropertyOfNullableInt32 was not expected. Use the XmlInclude or SoapInclude attribute to specify types that are not known statically.					

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        [SoapInclude(typeof(MdbPropertyOfNullableInt32)), SoapInclude(typeof(MdbPropertyOfString))]					

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"C:\Programme\Microsoft Visual Studio 8\SDK\v2.0\Bin\wsdl.exe" /out:WebService.cs /namespace:WebService http: //localhost/WebService.asmx?wsdl // edit: statt http://, da sonst als link erkannt -(					

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     [WebMethod]
        [SoapInclude(typeof(TestChild))]
        public TestBase Test()
        {
            TestChild c = new TestChild();
            c.TestB = "BaseString";
            c.TestC = "ChildString";
            return (TestBase)c;
        }					

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[WebMethod]
[XmlInclude(typeof(TestChild))]
public TestBase Test()
{
    TestChild c = new TestChild();
    c.TestB = "BaseString";
    c.TestC = "ChildString";
    return c; // cast ist hier unnötig
}