XmlDocument, SOAP& Namespaces - C# Discussion Boards

XmlDocument, SOAP& Namespaces

5-May-04 6:59

See the CallingConvention.ThisCall documentation in the .NET Framework SDK. See a previous post I wrote for more information: http://www.codeproject.com/script/comments/forums.asp?msg=771919&forumid=1649&XtraIDs=1649&searchkw=ThisCall&sd=11%2F15%2F1999&ed=4%2F12%2F2004#xx771919xx[^].

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MrEyes5-May-04 5:40

MrEyes

5-May-04 5:40

I have the following SOAP data (which I have no control over):

<?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>
    <Logon xmlns="http://www.domain.com/EP/">
      <userId>int</userId>
      <strPassword>string</strPassword>
      <strSessionId>string</strSessionId>
    </Logon>
  </soap:Body>
</soap:Envelope>

I need to be able to parse through this to extract the childnode values of <Logon>, and place these into a sorted list. Simple I thought, but namespaces are causing me some problems :

SortedList GetLogonData(string soapData)
{
	XmlDocument soapDataXdoc = new XmlDocument();
	soapDataXdoc.LoadXml(soapData);

	XmlNamespaceManager nsMgr = new XmlNamespaceManager(soapDataXdoc.NameTable);
	nsMgr.AddNamespace("soap", "http://schemas.xmlsoap.org/soap/envelope/");
	nsMgr.AddNamespace("", "http://www.domain.com/EP/");

	XmlNode logonNode = soapDataXdoc.SelectSingleNode("soap:Envelope/soap:Body/Logon", nsMgr);

	SortedList returnValue = new SortedList();
	foreach(XmlNode xn in logonNode.ChildNodes)
	{
		returnValue.Add(xn.Name, xn.InnerText);
	}

	return returnValue;
}

In theory this should return a sorted list with the following values

userId - int
strPassword - string
strSessionId - session

But when I retrieve the logonNode this returns null, which I believe is being caused by an incorrect xpath, but I do not know why it is incorrect.

Could anybody point me in the right direction?

post.mode = postmodes.signature;
SELECT everything FROM everywhere WHERE something = something_else;
> 1 Row Returned
> 42

Re: XmlDocument, SOAP& Namespaces

Heath Stewart5-May-04 5:44

Re: XmlDocument, SOAP& Namespaces

5-May-04 5:44

Using an empty namespace prefix doesn't work in .NET 1.x. Specify a namespace prefix in your code. The namespace prefixes don't have to match, so you can have the default namespace in your <Logon> element but use a namespace prefix in your code.

Also, to avoid adding the other namespaces, you could always add the namespace with a prefix (let's say "l") and just use an XPath expression like "//l:Logon" to get the node. Just a thought.

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MrEyes5-May-04 5:58

MrEyes

5-May-04 5:58

Not sure if I undertstood correctly, but I have essentially modified my code to the following :

XmlNamespaceManager nsMgr = new XmlNamespaceManager(soapDataXdoc.NameTable);
nsMgr.AddNamespace("soap", "http://schemas.xmlsoap.org/soap/envelope/");
nsMgr.AddNamespace("blank", "http://www.domain.com/EP/");
XmlNode logonNode = soapDataXdoc.SelectSingleNode("soap:Envelope/soap:Body/blank:Logon", nsMgr);

Also tried this :

nsMgr.AddNamespace("soap", "http://schemas.xmlsoap.org/soap/envelope/");
nsMgr.AddNamespace("blank", "http://www.domain.com/EP/");

XmlNode bodyNode = soapDataXdoc.SelectSingleNode("soap:Envelope/soap:Body", nsMgr);

foreach(XmlNode xn in bodyNode.ChildNodes)
{
	xn.Prefix = "blank";
}

XmlNode logonNode = soapDataXdoc.SelectSingleNode("soap:Envelope/soap:Body/blank:Logon", nsMgr);

Actually I definately didnt understand, as that didnt work

post.mode = postmodes.signature;
SELECT everything FROM everywhere WHERE something = something_else;
> 1 Row Returned
> 42

Re: XmlDocument, SOAP& Namespaces

Heath Stewart5-May-04 7:10

dataGridTextBoxColumn textBox

5-May-04 7:10

If you select a node using the XmlDocument instead of the DocumentElement, you must use a beginning "/" which uses a scope from the root element. The following sample works fine:

using System;
using System.Xml;

public class Test
{
  static void Main()
  {
    XmlDocument doc = new XmlDocument();
    doc.Load("Test.xml"); // Just a document with your data in my sample.

    XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);
    nsmgr.AddNamespace("soap", "http://schemas.xmlsoap.org/soap/envelope/");
    nsmgr.AddNamespace("l", "http://www.domain.com/EP/");

    XmlNode logonNode = doc.SelectSingleNode(
      "/soap:Envelope/soap:Body/l:Logon", nsmgr);
    if (logonNode != null)
    {
      foreach (XmlNode child in logonNode.ChildNodes)
        Console.WriteLine("{0}: {1}", child.Name, child.InnerText);
    }
  }
}

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blankg5-May-04 5:16

blankg

5-May-04 5:16

I want that while editing the textBox when I reach the edge
of the column to automaticly start a new line and when
finished that the text will be displayed that way.

c# Listbox help

John Baird5-May-04 4:48

John Baird

5-May-04 4:48

I'm pulling out what little remaining hair I have again. I have a list box with 8 items, the selected item is highlighted at the top of the list. I press a button (cmdMoveDown) and wish to move the selected item 1 item down the list.

I tried this:

public void MoveDown()<br />
{<br />
     int index = this.lstSelected.SelectedIndex;<br />
     int newindex = index + 1;<br />
<br />
     DataTable dtSelect = (DataTable)this.lstSelected.DataSource;<br />
     DataRow dr = dtSelect.Rows[index];<br />
<br />
     dtSelect.Rows.Remove(dr);<br />
     dtSelect.Rows.InsertAt(dr, newindex);<br />
}

this removes the item at index 0 just fine. But the insert doesn't happen and there is a blank line at the bottom of the list.

then i tried this variation:

public void MoveDown()<br />
{<br />
     int index = this.lstSelected.SelectedIndex;<br />
     int newindex = index + 1;<br />
<br />
     DataTable dtSelect = (DataTable)this.lstSelected.DataSource;<br />
     DataRow dr = dtSelect.Rows[index];<br />
     DataRow drNew = dtSelect.NewRow();<br />
<br />
     foreach(DataColumn dc in dtSelect.Columns)<br />
        drNew[dc.ColumnName] = dr[dc.ColumnName];<br />
<br />
     dtSelect.Rows.Remove(dr);<br />
     dtSelect.Rows.InsertAt(drNew, newindex);<br />
}

this variation removed the selected item and added the new row at the end of the list rather than at new index.

I tried various permutations of this code and could get nothing to work. Any suggestions?

Re: c# Listbox help

Heath Stewart5-May-04 4:59

5-May-04 4:59

A lot of this depends on how your data source is bound to the ListBox. When you update your DataTable like that, the changes may not be reflected in the ListBox. See the CurrencyManager for more information about a way to refresh the bindings, like calling Refresh on the CurrencyManager you can get from the ListBox.BindingContext (inheritted from the Control class).

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Re: c# Listbox help

John Baird5-May-04 9:21

John Baird

5-May-04 9:21

Okay. I traced through the previously posted code and the data is actually being inserted into the table correctly and at the correct position. It is the DefaultView which is causing the list to display in the wrong order.

I added the following to the method:

CurrencyManager cmSelect = (CurrencyManager)this.lstSelected.BindingContext(dtSelect);<br />
cmSelect.Refresh();

It runs without error, but nothing changes. Can anyone suggest another approach?

Re: c# Listbox help

Heath Stewart5-May-04 9:31

Re: Creating & Using DLL's

5-May-04 9:31

Then create a DataView on the table and set that as the DataSource.

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Creating & Using DLL's

Lakshmikanthan5-May-04 4:42

Lakshmikanthan

5-May-04 4:42

I'm Developing a WebApplication in which i have to pass parameter to DLL present in a remote computer and return the values returned by the DLL to the user... someone please help me in doing this....

Heath Stewart5-May-04 4:55

Diffgrams and Web Services

5-May-04 4:55

You can't load a DLL from a remote computer and have it executed on the remote computer. You need some sort of RPC (remote procedure call), such as DCOM, COM+, .NET Remoting (preferred in .NET applications), or Web Services (if the other machine has IIS installed). In those cases you could P/Invoke the exported function from that DLL (if it's native), thus wrapping the unmanaged function in a managed class (or a native DCOM or COM+ executable).

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MrJJKoolJ5-May-04 3:51

5-May-04 3:51

Hi,

I was thinking of combining a Diffgram Dataset with using Web Services. From my readings I noticed that I can save a dataset as a diffgram to a file after I do updates/inserts/deletes on the dataset. Then when I need to do more updates/inserts I reread the diffgram into a dataset and if I am connected to a database then use a dataadapter to update the database with changes. Is this correct in my assumption of how I can use the diffgram? I would create a Web Service to accept the Diffgram Dataset and have it create a DataAdapter to update the database. How does this sound? Any ideas?

Thanks,

JJ

Heath Stewart5-May-04 4:13

5-May-04 4:13

You could do this with a diffgram, but the DataSet and DataAdapter derivatives already support changes. Lets say that your client made changes to a DataSet it original got from a web service. To send the changes call DataSet.GetChanges to get just the changes (optionally, but decreases bandwidth consumption) and then pass the DataSet back to the web service. The web service could call DataAdapter.Update on the DataSet and optionally return the DataSet back to the client (in case there were changes made by other clients, etc.

Just be sure you don't call AcceptChanges otherwise all change information is lost. DataAdapter.Update does this automatically after updating the database. The DataAdapter should have all four command properties defined, and it's common to combine an INSERT and SELECT statement (separated by a semi-colon (;)) so that any auto-generated information (or default values) are included in the DataSet.

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MrJJKoolJ5-May-04 5:08

5-May-04 5:08

Hi Heath,

Ok, but this is for an alternative to my semi Offline connection problem. So I would try to contact a web service sitting on the server and if it can't make a connection then have the dataset write out to a diffgram xml file. If I can make a connection then send Diffgram dataset to web service to update database by using DataAdapter in web service. How does that sound, Heath?

Thanks,

JJ

Heath Stewart5-May-04 5:16

5-May-04 5:16

Fine, but why write-out the diffgram at all, unless you're worried about your application being closed. That's understandable.

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MrJJKoolJ5-May-04 5:23

5-May-04 5:23

ok, I'm not worried about the App being closed. But if connection can't be made to web service on server where do I store the dataset once data is entered in app? I assume just use a normal dataset if not going with diffgram to store locally? Also if I did use a diffgram dataset, this would be the same as replication to database on server. The web service dataadapter would check changes and only pass the inserts/updates etc. to db.

JJ

Heath Stewart5-May-04 5:25

5-May-04 5:25

Just keep it in memory as an object and keep adding/updating/deleting rows. Once a connection can be established, then send the diffgram (remember, don't ever call AcceptChanges or you won't have a diffgram! Smile | :)

). If you want to save this in case the application is closed, make sure you write out the diffgram using XmlWriteMode.DiffGram and read it back in later.

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MrJJKoolJ5-May-04 5:51