accessing an xml schema through a web service (C#)

[turnips11]

Hi All,

I am trying write a small web app which inserts a purchase order through an xml schema that I have exposed through a web service(using Biztalk 2004). I have that the PO can have many articles but I am not sure how the code should be for inserting each article? Here is the xml schema and below that is the button_click function I have wrote in C#.

[HTML]
<xs:element name="PO">
<xs:complexType >
<xs:sequence>
<xs:element name="ToSupplie r" type="xs:string " />
<xs:element minOccurs="1" maxOccurs="unbo unded" name="Articles" >
<xs:complexType >
<xs:sequence minOccurs="1" maxOccurs="unbo unded">
<xs:element name="Article">
<xs:complexType >
<xs:sequence>
<xs:element name="SupplierA rticleGUID" type="xs:string " />
<xs:element name="SupplierA rticlePriceGUID " type="xs:string " />
<xs:element name="Quantity" type="xs:int" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:element name="IssuedBy" type="xs:string " />
<xs:element name="ApprovalS tate" type="xs:int" />
</xs:sequence>
<xs:attribute name="OrderDate " type="xs:date" />
<xs:attribute name="Total" type="xs:decima l" />
</xs:complexType>
</xs:element>
[/HTML]
here is the function to insert the PO:

private void Button1_Click(object sender, System.EventArgs e)
  {
   localhost.PO oPO;
   localhost.POArticles oPOA;
   localhost.POArticlesArticle oPOAA;
 
   localhost.PurchaseOrderProcess_Orchestration_1_PurchaseOrderIN_Port oWSMethodCall;
 
   oPO = new localhost.PO();
   oPOA = new localhost.POArticles();
   oPOAA = new localhost.POArticlesArticle();
   oWSMethodCall = new localhost.PurchaseOrderProcess_Orchestration_1_PurchaseOrderIN_Port();
 
   oPO.OrderDate = System.DateTime.Now;
   oPO.Total = 11.50m; 
   oPO.ToSupplier = System.Guid.NewGuid().ToString();
   oPO.ApprovalState = 1;
   oPO.IssuedBy = "Jane Doe";
 
 
   oPOAA.SupplierArticleGUID = System.Guid.NewGuid().ToString();
   oPOAA.SupplierArticlePriceGUID = System.Guid.NewGuid().ToString();
   oPOAA.Quantity = 3;
   oPOA.Article = oPOAA;
   oPO.Articles.Initialize();  
   oPO.Articles.SetValue(oPOA,0);
 
   oWSMethodCall.Operation_1(oPO);
 
  }
 
 

On the highlighted line I get the following error: Object reference not set to an instance of an object.

I would appreciate any help!!

[jkmyoung]

guessing you need to add this line before that:
oPO.Articles = oPOA;

Otherwise, oPO.Articles will still be null.

[turnips11]

Hi thanks for replying!

Well I was following a tutorial and that was exactly what it said to do but when I try that I get the error: Cannot implicitly convert type 'PODriver.local host.POArticles ' to 'PODriver.local host.POArticles[]'

so I changed it to the last 2 lines. Do you know how I would correct this error then?

[turnips11]

Hi, I am still stuck on this problem and I would really really appreciate it if anyone could take the time and explain to me how I am supposed to initialise this array in order to insert the articles.

[jkmyoung]

2nd guess then:
oPO.Articles = new localhost.POArt icles[1];
oPO.Articles[0] = oPOA;

Do you have any documentation on the PODriver class?

[turnips11]

Oh thanks a million it works now!! Only thing is that it inserts 'null' values for the lines:

oPO.OrderDate = System.DateTime .Now;
(datatype = System.Decimal) oPO.Total = 11.50m;

do you know how I solve this?

Thanks again for your help!

[jkmyoung]

Do you have the link to the tutorial?

[turnips11]

Well this is the tutorial I was following but I changed it around to use with the way I needed it, though the two values I am having problems with are different then the tutorial. One is for the current date and the other is of type decimal. Is there something particular that has to be done for these types?

http://www.codeguru.com/cpp/i-n/inte...cle.php/c7785/

[jkmyoung]

Note that you're having a problem with the attributes.
If you're allowed to edit the xml that comes out, I suggest recasting these as elements, at least for the time being.

You probably have to set attributes differently in Biztalk.

[turnips11]

Oh thanks, you are right I didn't realise that! I will change them to elements, its easier!