SOAP, dotNET, datasets, Object reference not set to an instance ofan object - XML SOAP

This is a discussion on SOAP, dotNET, datasets, Object reference not set to an instance ofan object - XML SOAP ; Hi All, please help.. Ok I've given up. Lets hope someone can help me out. I'm trying to write a web service using dot NET and C#. I've used xsd.exe to create my dataset from a .xsd file. I've then ...

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SOAP, dotNET, datasets, Object reference not set to an instance ofan object

  1. Default SOAP, dotNET, datasets, Object reference not set to an instance ofan object

    Hi All, please help..

    Ok I've given up. Lets hope someone can help me out.

    I'm trying to write a web service using dot NET and C#.

    I've used xsd.exe to create my dataset from a .xsd file. I've then
    created a web-service method which passed this dataset as a parameter.

    However when I try to access this dataset as an object I get

    System.NullReferenceException: Object reference not set to an instance
    of an object.
    at WsPie.SearchOrderSend(SearchOrderSendType SearchOrderSend) in
    d:\Inetpub\wwwroot\pie-x.com\http.dev\ws\searches-test.asmx:line 163

    I've written most of the code for the web service manually. I believe
    I'm missing something really simple, but I just don't know what.

    I'm trying to get
    public string SearchOrderSend
    working

    I've used
    public string Time
    as a test method which works fine, and I can pass simple string
    parameters ok. It's just when I start using complex datasets that I have
    issues.

    I hope this makes sense, please let me know if you need more information.
    Thanks
    Pritchie

    ==== ==== ==== ==== ==== ==== ==== ====
    ==== ==== ==== ==== ==== ==== ==== ====
    ==== ==== ==== ==== ==== ==== ==== ====
    START - searches-test.asmx, My web service page
    ---- ---- ---- ---- ---- ---- ---- ----


    <%@ WebService Language="C#" Class="WsMySite" %>

    /* NOTE for telnet SOAP functions, for Content-Length: use word's
    space+char count + line count + 2
    */

    /*-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---70
    */

    // Minimum namespaces required for webservices
    using System;
    using System.Web.Services; // required for WebService classes
    using System.Xml.Serialization; // required for XmlAttribute()
    // Other namespaces
    using System.Data;
    //using System.Runtime.Remoting.Metadata;

    using System.Web.Services.Protocols;
    using System.Xml;

    /*-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---70
    START Data Sets
    */

    using System.Xml.Serialization;

    //
    // This source code was auto-generated by xsd, Version=2.0.50727.42.
    //


    [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.42")]
    [System.SerializableAttribute()]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    [System.Xml.Serialization.XmlTypeAttribute(Namespace="http://www.oscre.org/ns/Searches/Draft-V2")]
    [System.Xml.Serialization.XmlRootAttribute("SearchOrderSend",
    Namespace="http://www.oscre.org/ns/Searches/Draft-V2", IsNullable=false)]
    public partial class SearchOrderSendType {

    private Q1HeaderType headerField = new Q1HeaderType();
    private Q1AuthenticationType authenticationField = new
    Q1AuthenticationType();


    [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]
    public Q1HeaderType Header {
    get { return this.headerField; }
    set { this.headerField = value; }
    }


    [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]
    public Q1AuthenticationType Authentication {
    get { return this.authenticationField; }
    set { this.authenticationField = value; }
    }

    }


    [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.42")]
    [System.SerializableAttribute()]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    [System.Xml.Serialization.XmlTypeAttribute(Namespace="http://www.oscre.org/ns/Searches/Draft-V2")]
    public partial class Q1HeaderType {

    private Q1TextType versionField;
    private Q1TextType modeField;


    [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]
    public Q1TextType Version {
    get { return this.versionField; }
    set { this.versionField = value; }
    }


    [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]
    public Q1TextType Mode {
    get { return this.modeField; }
    set { this.modeField = value; }
    }
    }


    [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.42")]
    [System.SerializableAttribute()]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    [System.Xml.Serialization.XmlTypeAttribute(Namespace="http://www.oscre.org/ns/Searches/Draft-V2")]
    public partial class Q1AuthenticationType {

    private Q1TextType authenticationKeyField;
    private Q1TextType usernameField;
    private Q1TextType passwordField;


    [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]
    public Q1TextType AuthenticationKey {
    get { return this.authenticationKeyField; }
    set { this.authenticationKeyField = value; }
    }


    [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]
    public Q1TextType Username {
    get { return this.usernameField; }
    set { this.usernameField = value; }
    }


    [System.Xml.Serialization.XmlElementAttribute(Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]
    public Q1TextType Password {
    get { return this.passwordField; }
    set { this.passwordField = value; }
    }
    }


    [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.42")]
    [System.SerializableAttribute()]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    [System.Xml.Serialization.XmlTypeAttribute(Namespace="http://www.oscre.org/ns/Searches/Draft-V2")]
    public partial class Q1TextType {

    private string valueField;

    [System.Xml.Serialization.XmlTextAttribute()]
    public string Value {
    get { return this.valueField; }
    set { this.valueField = value; }
    }
    }


    /*-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---70
    END Data Sets
    */

    [ WebService(Namespace="http://mysite.com.ni.dev/ws")
    ]
    public class WsPie: WebService
    {

    //Inherits System.web.ui.page

    /* test time function */
    [ WebMethod
    ( Description="Returns the time as stored on the Server"
    ,EnableSession=false
    )
    ]
    public string Time()
    {
    return Context.Timestamp.TimeOfDay.ToString();
    }


    /* Test method for SearchOrderSend */
    [ WebMethod
    ( Description="SearchOrderSend, Request case searches"
    ,EnableSession=false
    ),

    System.Web.Services.Protocols.SoapDocumentMethodAttribute(ParameterStyle=System.Web.Services.Protocols.SoapParameterStyle.Bare)
    ]
    public string SearchOrderSend(SearchOrderSendType SearchOrderSend)
    {
    string strData = "";

    Q1HeaderType objHeader = SearchOrderSend.Header;

    strData = objHeader.Version.Value;

    return "Data: " + strData;
    }

    }


    ==== ==== ==== ==== ==== ==== ==== ====
    END - searches-test.asmx


    ==== ==== ==== ==== ==== ==== ==== ====
    ==== ==== ==== ==== ==== ==== ==== ====
    ==== ==== ==== ==== ==== ==== ==== ====
    START - SearchOrderSend-dev.soap, My SOAP Envelope sent to
    searches-test.asmx web service
    ---- ---- ---- ---- ---- ---- ---- ----

    POST /ws/searches-test.asmx HTTP/1.1
    Host: mysite.com.ni.dev
    Content-Type: text/xml; charset=utf-8
    Content-Length: 572
    SOAPAction: "http://mysite.com.ni.dev/ws/SearchOrderSend"

    <?xml version="1.0" encoding="utf-8"?>
    <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
    <soap:Body>
    <SearchOrderSend xmlns="http://mysite.com.ni.dev/ws">
    <Header>
    <Version>
    2</Version>
    <Mode>
    TEST</Mode>
    </Header>
    <Authentication>
    <Username>
    TestUsername</Username>
    <Password>
    TestUsernamePw</Password>
    </Authentication>
    </SearchOrderSend>
    </soap:Body>
    </soap:Envelope>


    ==== ==== ==== ==== ==== ==== ==== ====
    END - My SOAP Envelope
    ---- ---- ---- ---- ---- ---- ---- ----



    ==== ==== ==== ==== ==== ==== ==== ====
    ==== ==== ==== ==== ==== ==== ==== ====
    ==== ==== ==== ==== ==== ==== ==== ====
    Feedback from the web service via netcat
    ---- ---- ---- ---- ---- ---- ---- ----


    $ nc MySite.com.ni.dev 80 < SearchOrderSend-dev.soap
    HTTP/1.1 500 Internal Server Error
    Date: Thu, 24 May 2007 10:30:07 GMT
    Server: Microsoft-IIS/6.0
    X-Powered-By: ASP.NET
    X-AspNet-Version: 2.0.50727
    Cache-Control: private
    Content-Type: text/xml; charset=utf-8
    Content-Length: 702

    <?xml version="1.0" encoding="utf-8"?><soap:Envelope
    xmlns:soap="http://schemas.xmlsoap.org/soap/env
    elope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:xsd="http://www.w3.org/2001/XMLS
    chema"><soap:Body><soap:Fault><faultcode>soap:Server</faultcode><faultstring>System.Web.Services.Pro
    tocols.SoapException: Server was unable to process request. ---&gt;
    System.NullReferenceException: Object reference not set to an instance
    of an object.
    at WsMySite.SearchOrderSend(SearchOrderSendType SearchOrderSend) in
    d:\Inetpub\wwwroot\MySite.com\http.dev\ws\searches-test.asmx:line 163
    --- End of inner exception stack trace ---</faultstring><detail
    /></soap:Fault></soap:Body>
    </soap:Envelope>

  2. Default Re: SOAP, dotNET, datasets, Object reference not set to an instance of an object

    "Pritchie" <info-2007_RemoveThis_@thebigbunker.com> wrote in message
    news:20i5i.4778$rQ4.2234@newsfe1-win.ntli.net...
    > Hi All, please help..
    >
    > Ok I've given up. Lets hope someone can help me out.
    >
    > I'm trying to write a web service using dot NET and C#.
    >
    > I've used xsd.exe to create my dataset from a .xsd file. I've then
    > created a web-service method which passed this dataset as a parameter.
    >
    > However when I try to access this dataset as an object I get
    >
    > System.NullReferenceException: Object reference not set to an instance of
    > an object.

    NullReferenceException usually means what it says: you tried to dereference
    a data item containing null. So the questions are: which data item are you
    trying to dereference, and why is it null?

    In the case of web services, the answers are frequently "I'm trying to
    dereference an input parameter to my web method", and "because there's a
    mismatch between the XML namespace that the server is expecting the elements
    to be in, and the XML namespace being sent by the client". If your server is
    expecting to receive something in namespace http://example.org, and you send
    it something in http://example.org/myExample, then the web service will
    receive null, because you didn't actually send it anything.
    --
    John Saunders [MVP]


  3. Default Re: SOAP, dotNET, datasets, Object reference not set to an instanceof an object

    Hi All,

    Well I've now been able to get back to this.

    And I've located the problem to be with regards to the XmlRootAttribute
    namespace (as hinted by John). The namespace for the XmlRootAttribute
    needs to be identical for both the dataset of the web method and the
    SOAP envelope. As I'd played around with the code so much (it was a
    mess) I decided to start again, and in doing so it worked first time. So
    I then tried breaking it.

    [System.CodeDom.Compiler.GeneratedCodeAttribute("xsd", "2.0.50727.42")]
    [System.SerializableAttribute()]
    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.ComponentModel.DesignerCategoryAttribute("code")]
    [System.Xml.Serialization.XmlTypeAttribute(Namespace="http://www.oscre.org/ns/Searches/Draft-V2")]
    [System.Xml.Serialization.XmlRootAttribute("SearchOrderSend",
    Namespace="http://www.oscre.org/ns/Searches/Draft-V2", IsNullable=false)]
    public partial class SearchOrderSendType {

    private Q1HeaderType headerField = new Q1HeaderType();
    private Q1AuthenticationType authenticationField = new
    Q1AuthenticationType();

    ... code removed ...

    }


    AND


    <soap:Body>
    <SearchOrderSend xmlns="http://www.oscre.org/ns/Searches/Draft-V2">
    <Header xmlns="">
    <Version>
    2</Version>
    <Mode>
    TEST</Mode>
    </Header>
    ... code removed ...
    </SearchOrderSend>
    </soap:Body>


    IF either "http://www.oscre.org/ns/Searches/Draft-V2" in

    <SearchOrderSend xmlns="http://www.oscre.org/ns/Searches/Draft-V2">

    OR

    [System.Xml.Serialization.XmlRootAttribute("SearchOrderSend",
    Namespace="http://www.oscre.org/ns/Searches/Draft-V2", IsNullable=false)]

    are different you get the error message

    System.NullReferenceException: Object reference not set to an instance
    of an object.

    Thanks John for your help with this.

    Pritchie

    John Saunders [MVP] wrote:
    > "Pritchie" <info-2007_RemoveThis_@thebigbunker.com> wrote in message
    > news:20i5i.4778$rQ4.2234@newsfe1-win.ntli.net...
    >> Hi All, please help..
    >>
    >> Ok I've given up. Lets hope someone can help me out.
    >>
    >> I'm trying to write a web service using dot NET and C#.
    >>
    >> I've used xsd.exe to create my dataset from a .xsd file. I've then
    >> created a web-service method which passed this dataset as a parameter.
    >>
    >> However when I try to access this dataset as an object I get
    >>
    >> System.NullReferenceException: Object reference not set to an instance of
    >> an object.
    >
    > NullReferenceException usually means what it says: you tried to dereference
    > a data item containing null. So the questions are: which data item are you
    > trying to dereference, and why is it null?
    >
    > In the case of web services, the answers are frequently "I'm trying to
    > dereference an input parameter to my web method", and "because there's a
    > mismatch between the XML namespace that the server is expecting the elements
    > to be in, and the XML namespace being sent by the client". If your server is
    > expecting to receive something in namespace http://example.org, and you send
    > it something in http://example.org/myExample, then the web service will
    > receive null, because you didn't actually send it anything.

  4. Default Re: SOAP, dotNET, datasets, Object reference not set to an instanceof an object

    Also the children of SearchOrderSend need to have a blank namespace set.

    Why this is I'm sure, maybe someone out there can explain it.

    However this works

    <soap:Body>
    <SearchOrderSend xmlns="http://www.oscre.org/ns/Searches/Draft-V2">
    <Header xmlns="">
    <Version>2.0</Version>
    <Mode>TEST</Mode>
    </Header>
    <Authentication xmlns="">
    <AuthenticationKey />
    <Username>PiePropertyServices</Username>
    <Password>Password123</Password>
    </Authentication>
    <SearchOrder xmlns="">
    <SearchOrderDate>2007-04-17</SearchOrderDate>
    <ProductQuantityNumeric>2</ProductQuantityNumeric>
    <TotalPriceAmount currencyID="GBP">153.95</TotalPriceAmount>
    </SearchOrder>
    </SearchOrderSend>
    </soap:Body>

    But remove the
    xmlns=""
    so
    <SearchOrder xmlns="">
    becomes
    <SearchOrder>
    and you get NullReferenceException.

    <?xml version="1.0" encoding="utf-8"?><soap:Envelope
    xmlns:soap="http://schemas.xmlsoap.org/soap/env
    elope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:xsd="http://www.w3.org/2001/XMLS
    chema"><soap:Body><soap:Fault><faultcode>soap:Server</faultcode><faultstring>System.Web.Services.Pro
    tocols.SoapException: Server was unable to process request. ---&gt;
    System.NullReferenceException: Object reference not set to an instance
    of an object.

    So removing xmlns="" changes the namespace of that element.

    "...
    An empty value for xmlns makes the mapping treat unprefixed element type
    names as local names (which is the default behaviour in the absence of
    xmlns attributes).
    ...."
    http://www.jclark.com/xml/xmlns.htm

    "...
    The system has inserted an xmlns="" namespace declaration because you
    have asked for the <exportTimeStamp> element to go in the null
    namespace.
    ...."
    http://www.biglist.com/lists/xsl-lis.../msg00986.html

    Thanks
    Pritchie



    John Saunders [MVP] wrote:
    > "Pritchie" <info-2007_RemoveThis_@thebigbunker.com> wrote in message
    > news:20i5i.4778$rQ4.2234@newsfe1-win.ntli.net...
    >> Hi All, please help..
    >>
    >> Ok I've given up. Lets hope someone can help me out.
    >>
    >> I'm trying to write a web service using dot NET and C#.
    >>
    >> I've used xsd.exe to create my dataset from a .xsd file. I've then
    >> created a web-service method which passed this dataset as a parameter.
    >>
    >> However when I try to access this dataset as an object I get
    >>
    >> System.NullReferenceException: Object reference not set to an instance of
    >> an object.
    >
    > NullReferenceException usually means what it says: you tried to dereference
    > a data item containing null. So the questions are: which data item are you
    > trying to dereference, and why is it null?
    >
    > In the case of web services, the answers are frequently "I'm trying to
    > dereference an input parameter to my web method", and "because there's a
    > mismatch between the XML namespace that the server is expecting the elements
    > to be in, and the XML namespace being sent by the client". If your server is
    > expecting to receive something in namespace http://example.org, and you send
    > it something in http://example.org/myExample, then the web service will
    > receive null, because you didn't actually send it anything.

  5. Default Re: SOAP, dotNET, datasets, Object reference not set to an instance of an object

    On May 24, 10:28 pm, "John Saunders [MVP]" <john.saunders at
    trizetto.com> wrote:
    > "Pritchie" <info-2007_RemoveTh...@thebigbunker.com> wrote in message
    >
    > news:20i5i.4778$rQ4.2234@newsfe1-win.ntli.net...
    >
    > > Hi All, please help..
    >
    > > Ok I've given up. Lets hope someone can help me out.
    >
    > > I'm trying to write a web service using dot NET and C#.
    >
    > > I've used xsd.exe to create my dataset from a .xsd file. I've then
    > > created a web-service method which passed this dataset as a parameter.
    >
    > > However when I try to access this dataset as an object I get
    >
    > > System.NullReferenceException: Object reference not set to an instance of
    > > an object.
    >
    > NullReferenceException usually means what it says: you tried to dereference
    > a data item containing null. So the questions are: which data item are you
    > trying to dereference, and why is it null?
    >
    > In the case of web services, the answers are frequently "I'm trying to
    > dereference an input parameter to my web method", and "because there's a
    > mismatch between the XML namespace that the server is expecting the elements
    > to be in, and the XML namespace being sent by the client". If your server is
    > expecting to receive something in namespacehttp://example.org, and you send
    > it something inhttp://example.org/myExample, then the web service will
    > receive null, because you didn't actually send it anything.
    > --
    > John Saunders [MVP]

    hi friend
    when i got this Exception
    ihave reinitilzed the class i am using u can try with this
    regards
    santosh

  6. Default Re: SOAP, dotNET, datasets, Object reference not set to an instance of an object

    <santosh.gornal> wrote in message
    news:1184215755.989280.271420@d55g2000hsg.googlegroups.com...
    > On May 24, 10:28 pm, "John Saunders [MVP]" <john.saunders at
    > trizetto.com> wrote:
    >> "Pritchie" <info-2007_RemoveTh...@thebigbunker.com> wrote in message
    >>
    >> news:20i5i.4778$rQ4.2234@newsfe1-win.ntli.net...
    >>
    >> > Hi All, please help..
    >>
    >> > Ok I've given up. Lets hope someone can help me out.
    >>
    >> > I'm trying to write a web service using dot NET and C#.
    >>
    >> > I've used xsd.exe to create my dataset from a .xsd file. I've then
    >> > created a web-service method which passed this dataset as a parameter.
    >>
    >> > However when I try to access this dataset as an object I get
    >>
    >> > System.NullReferenceException: Object reference not set to an instance
    >> > of
    >> > an object.
    >>
    >> NullReferenceException usually means what it says: you tried to
    >> dereference
    >> a data item containing null. So the questions are: which data item are
    >> you
    >> trying to dereference, and why is it null?
    >>
    >> In the case of web services, the answers are frequently "I'm trying to
    >> dereference an input parameter to my web method", and "because there's a
    >> mismatch between the XML namespace that the server is expecting the
    >> elements
    >> to be in, and the XML namespace being sent by the client". If your server
    >> is
    >> expecting to receive something in namespacehttp://example.org, and you
    >> send
    >> it something inhttp://example.org/myExample, then the web service will
    >> receive null, because you didn't actually send it anything.
    >> --
    >> John Saunders [MVP]
    >
    > hi friend
    > when i got this Exception
    > ihave reinitilzed the class i am using u can try with this

    I do not understand your question. Please provide more detail.
    --
    John Saunders [MVP]

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