Re: Multiline textbox down arrow is missing - C# Discussion Boards

Is there a way to serialize to an XML file?

15-Jun-04 3:27

There are several good articles here on CodeProject, if you'd only search for them. The best one available is TaskbarNotifier, a skinnable MSN Messenger-like popup in C# and now in VB.NET too[^].

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matthias s.14-Jun-04 22:21

matthias s.

14-Jun-04 22:21

Hi,

I'm just wondering if a class with the [Serializable] attribute could be serialized to an XML file. Whats the easiest way? Where to start reading?

Thanks in advance,

Matthias

If eell I ,nust draw to your atenttion to het fakt that I can splel perfrectly well - i;ts my typeying that sukcs.
(Lounge/David Wulff)

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Re: Is there a way to serialize to an XML file?

Member 114126615-Jun-04 0:47

Member 1141266

15-Jun-04 0:47

using System;
using System.Xml;
using System.Xml.Serialization;
using System.IO;
using System.Collections;
using System.Data ;

/* The XmlRootAttribute allows you to set an alternate name
(PurchaseOrder) of the XML element, the element namespace; by
default, the XmlSerializer uses the class name. The attribute
also allows you to set the XML namespace for the element. Lastly,
the attribute sets the IsNullable property, which specifies whether
the xsi:null attribute appears if the class instance is set to
a null reference. */
[XmlRootAttribute("PurchaseOrder", Namespace="http://www.cpandl.com",
IsNullable = false)]
public class PurchaseOrder
{
public Address ShipTo;
public string OrderDate;
/* The XmlArrayAttribute changes the XML element name
from the default of "OrderedItems" to "Items". */
[XmlArrayAttribute("Items")]
public OrderedItem[] OrderedItems;
public decimal SubTotal;
public decimal ShipCost;
public decimal TotalCost;
}

public class Address
{
/* The XmlAttribute instructs the XmlSerializer to serialize the Name
field as an XML attribute instead of an XML element (the default
behavior). */
[XmlAttribute]
public string Name;
public string Line1;

/* Setting the IsNullable property to false instructs the
XmlSerializer that the XML attribute will not appear if
the City field is set to a null reference. */
[XmlElementAttribute(IsNullable = false)]
public string City;
public string State;
public string Zip;
}

public class OrderedItem
{
public string ItemName;
public string Description;
public decimal UnitPrice;
public int Quantity;
public decimal LineTotal;

/* Calculate is a custom method that calculates the price per item,
and stores the value in a field. */
public void Calculate()
{
LineTotal = UnitPrice * Quantity;
}
}

public class Test
{
public static void Main()
{
// Read and write purchase orders.
Test t = new Test();
t.CreatePO("po.xml");
t.ReadPO("po.xml");
t.CreatCol() ;
}

private void CreatCol()
{
XmlSerializer serializer =
new XmlSerializer(typeof(MyCoulumnClollectionClass));
TextWriter writer = new StreamWriter("Hadi.xml");
MyCoulumnClollectionClass d=new MyCoulumnClollectionClass() ;
SCol s1=new SCol() ;
s1.FieldName ="stud_no" ;
s1.DisplayName="stud_displayname";
d.Add(s1);

s1=new SCol() ;
s1.FieldName="FN2" ;
s1.DisplayName="DN2" ;
s1.AAAA="====" ;
d.Add(s1) ;
serializer.Serialize(writer, d);
writer.Close();
}
private void CreatePO(string filename)
{
// Create an instance of the XmlSerializer class;
// specify the type of object to serialize.
XmlSerializer serializer =
new XmlSerializer(typeof(PurchaseOrder));
TextWriter writer = new StreamWriter(filename);
PurchaseOrder po=new PurchaseOrder();

// Create an address to ship and bill to.
Address billAddress = new Address();
billAddress.Name = "Teresa Atkinson";
billAddress.Line1 = "1 Main St.";
billAddress.City = "AnyTown";
billAddress.State = "WA";
billAddress.Zip = "00000";
// Set ShipTo and BillTo to the same addressee.
po.ShipTo = billAddress;
po.OrderDate = System.DateTime.Now.ToLongDateString();

// Create an OrderedItem object.
OrderedItem i1 = new OrderedItem();
i1.ItemName = "Widget S";
i1.Description = "Small widget";
i1.UnitPrice = (decimal) 5.23;
i1.Quantity = 3;
i1.Calculate();

// Insert the item into the array.
OrderedItem [] items = {i1};
po.OrderedItems = items;
// Calculate the total cost.
decimal subTotal = new decimal();
foreach(OrderedItem oi in items)
{
subTotal += oi.LineTotal;
}
po.SubTotal = subTotal;
po.ShipCost = (decimal) 12.51;
po.TotalCost = po.SubTotal + po.ShipCost;
// Serialize the purchase order, and close the TextWriter.
serializer.Serialize(writer, po);
writer.Close();
}

protected void ReadPO(string filename)
{
// Create an instance of the XmlSerializer class;
// specify the type of object to be deserialized.
XmlSerializer serializer = new XmlSerializer(typeof(PurchaseOrder));
/* If the XML document has been altered with unknown
nodes or attributes, handle them with the
UnknownNode and UnknownAttribute events.*/
serializer.UnknownNode+= new
XmlNodeEventHandler(serializer_UnknownNode);
serializer.UnknownAttribute+= new
XmlAttributeEventHandler(serializer_UnknownAttribute);

// A FileStream is needed to read the XML document.
FileStream fs = new FileStream(filename, FileMode.Open);
// Declare an object variable of the type to be deserialized.
PurchaseOrder po;
/* Use the Deserialize method to restore the object's state with
data from the XML document. */
po = (PurchaseOrder) serializer.Deserialize(fs);
// Read the order date.
Console.WriteLine ("OrderDate: " + po.OrderDate);

// Read the shipping address.
Address shipTo = po.ShipTo;
ReadAddress(shipTo, "Ship To:");
// Read the list of ordered items.
OrderedItem [] items = po.OrderedItems;
Console.WriteLine("Items to be shipped:");
foreach(OrderedItem oi in items)
{
Console.WriteLine("\t"+
oi.ItemName + "\t" +
oi.Description + "\t" +
oi.UnitPrice + "\t" +
oi.Quantity + "\t" +
oi.LineTotal);
}
// Read the subtotal, shipping cost, and total cost.
Console.WriteLine("\t\t\t\t\t Subtotal\t" + po.SubTotal);
Console.WriteLine("\t\t\t\t\t Shipping\t" + po.ShipCost);
Console.WriteLine("\t\t\t\t\t Total\t\t" + po.TotalCost);
}

protected void ReadAddress(Address a, string label)
{
// Read the fields of the Address object.
Console.WriteLine(label);
Console.WriteLine("\t"+ a.Name );
Console.WriteLine("\t" + a.Line1);
Console.WriteLine("\t" + a.City);
Console.WriteLine("\t" + a.State);
Console.WriteLine("\t" + a.Zip );
Console.WriteLine();
}

protected void serializer_UnknownNode
(object sender, XmlNodeEventArgs e)
{
Console.WriteLine("Unknown Node:" + e.Name + "\t" + e.Text);
}

protected void serializer_UnknownAttribute
(object sender, XmlAttributeEventArgs e)
{
System.Xml.XmlAttribute attr = e.Attr;
Console.WriteLine("Unknown attribute " +
attr.Name + "='" + attr.Value + "'");
}
}

public class SCol
{
// public string FiledName
// {
// get
// {
// return m_fieldName ;
// }
// }
// public void SetFiledName(string f)
// {
// m_fieldName=f ;
// }
[XmlElement(ElementName = "TaxRate")]
public string FieldName
{
get
{
return m_ ;
}
set
{
m_=value ;
}
}
public string DisplayName ;
[XmlIgnoreAttribute]
public DataTable m_columnTable ;
private string m_ ;
[XmlElement]
public string AAAA ;
}
public class MyCoulumnClollectionClass : CollectionBase
{
//[XmlElement(ElementName = "Collection")]
//[XmlArrayAttribute("Items")]
public SCol this[ int index ]
{
get
{
return( (SCol) List[index] );
}
set
{
List[index] = value;
}
}
public int Add( SCol value )
{
return( List.Add( value ) );
}

public int IndexOf( SCol value )
{
return( List.IndexOf( value ) );
}

public void Insert( int index, SCol value )
{
List.Insert( index, value );
}

public void Remove( SCol value )
{
List.Remove( value );
}

public bool Contains( SCol value )
{
// If value is not of type Int16, this will return false.
return( List.Contains( value ) );
}
}

Re: Is there a way to serialize to an XML file?

Heath Stewart15-Jun-04 3:26

Multiline textbox down arrow is missing

15-Jun-04 3:26

The SerializableAttribute has nothing to do with XML Serialization (only Runtime Serialization).

Any class can be serialized using XML Serializer (see the documentation for the XmlSerializer class in the .NET Framework SDK). Only public properties and fields are serialized, however. You can use the XML Serialization attributes (read about the classes in the System.Xml.Serialization namespace), such as the element or attribute name for a property, the data type (if you want to override the default behavior), the namespace of a class or element, etc.

Read the class documentation for the XmlSerializer in the .NET Framework SDK. There are links to a lot of topics in the .NET Framework SDK as well as several good examples and snippets of code.

Microsoft MVP, Visual C#
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Sudhakar Pasupunuri14-Jun-04 21:42

Sudhakar Pasupunuri

14-Jun-04 21:42

Hi..

I have a tabcontrol on a Form..On this i am adding few tabpages..On the first tabpage I used few labels and edit boxes..in the last i used a texbox control..After displaying this tabpage i am able to see all controls properly but in case of listbox control the vertical bar down arrow is missing..

can anyone help me in this..

Thanks
Sudhakar

Fouad_kayali15-Jun-04 0:16

Fouad_kayali

15-Jun-04 0:16

Hi Can you send a from to check the problem, please

Heath Stewart15-Jun-04 3:22

15-Jun-04 3:22

Unless ScrollAlwaysVisible is set to true, your scroll bar will not appear unless more items than the ListBox can display at a time are present.

If this is not the problem, please be a little more descriptive, such as posting a snippet of relevant code (please do not post the whole thing), describing what you're doing with the ListBox, etc. We can't see your code nor do we know it. Unless you're specific about a problem, we really can't help you.

Microsoft MVP, Visual C#
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Sudhakar Pasupunuri15-Jun-04 3:41

Sudhakar Pasupunuri

15-Jun-04 3:41

That was not my problem..I am able to see the vertical scroll bar correctly but the down arrow in that scroll bar is missing..I want to put a snapshot of it as an attachement..But i am not able to find how i can do tht in this forum..can u plz tell me so that i can send a snapshot..

Thanks
Sudhakar

Heath Stewart15-Jun-04 4:01

15-Jun-04 4:01

Most likely your control is being clipped. Make sure that the entire ListBox control is within the client region of the TabPage. If you can resize the TabControl, make sure you set the Anchor or Dock properties for your ListBox accordingly.

Microsoft MVP, Visual C#
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Wackatronic15-Jun-04 9:26

Wackatronic

15-Jun-04 9:26

Use Alt-Print Scrn.
Then go to MSPaint.
Press Ctrl-V.
Save as desired image format and post it!.

Yes, I program in VB, but only to feed my addiction to a warm place to sleep and food to eat!

Visit my Code Project blog (Mobile Audio project)[^]

Sudhakar Pasupunuri15-Jun-04 20:01

Sudhakar Pasupunuri

15-Jun-04 20:01

I know all the above steps..But i want to know how to attach the saved image while postiing in this forum.. I didnt see any option while posting this message which says "attach ur files" .. I tried copying the image and paste it inline but tht is also not working..

Thanks
Sudhakar

Databinding objects

WillemM14-Jun-04 21:40

WillemM

14-Jun-04 21:40

I have a custom class called Invoice, which has a property Customer. This property Contains a reference to a customer class.

I want to bind a combobox to a the list of customers and bind the selected value to my Customer property. How can I do this?

"Every rule in a world of bits and bytes can be bend or eventually be broken"

Re: Databinding objects

Heath Stewart15-Jun-04 3:19

Re: NULLReferenceException

15-Jun-04 3:19

Bind the ComboBox to your Customers property, and set the DisplayMember and ValueMember to the properties for a Customer class that you want to bind:

comboBox1.DisplayMember = "Name";
comboBox1.ValueMember = "ID"; // Just assuming common properties of a Customer
comboBox1.DataSource = someObject.Customers; // Must implement IList

See the property documentation for the ListControl.DataSource property for more information and an example (ComboBox extends ListControl).

Microsoft MVP, Visual C#
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NULLReferenceException

qur14-Jun-04 21:39

qur

14-Jun-04 21:39

Hi All
I am calling the function from DLL using InteropServices. But when i called the function that accept the string as parameter NullReference exception is thrown.

Actual function signature:
int GetName(int pModel, int iVar, char *pszVarname);

Function Signature for C#:

[DllImport("C:\\MyFunctions.dll")]
public static extern int GetName(int nProb, int nIndex, ref string sVarName);

Fuction Call:
string sVarName;
int nErrCode, i;
i = 14;
sVarName = "x123456";
nErrCode = GetName(nProb,i, ref sVarName); //Getting NullReferenceException

Thanks in advance
qur

Heath Stewart15-Jun-04 3:15

help! java webservices and C# clients...

15-Jun-04 3:15

Don't ref the string. A char* is a string. The signature in C# should be (and loose the path - put the DLL in a directory in your PATH environment variable, or the current application directory):

[DllImport("MyFunctions.dll", CharSet=CharSet.Ansi)]
public static extern int GetName(int nProb, int nIndex, string sVarName);

Also notice the CharSet field in the DllImportAttribute. .NET deals with Unicode strings. If you don't specify a CharSet, CharSet.Ansi is used by default for C# and VB.NET, but it's still a good idea to specify it for readability.

Also notice there's no out or ref keyword for the sVarName parameter (which, by the way, can be called anything you want). A String (C# alias string) is already a reference type.

Also, if you want your code to be portable, those int parameters and return should actually be IntPtr. An int in C/C++ is a processor-dependent bit width (i.e., 32 bits on a 32-bit CPU, 64 bits on a 64-bit CPU). int in .NET (an Int32, actually) is always 32 bits. When .NET 2.0 is released and if your code runs on a 64-bit platform (and your native DLL is recompiled for a 64-bit platform), your call will fail.

Finally, never make P/Invoke'd methods public (unless the class that declares them is private or internal). Native function calls are unmanaged, so the CLR can't determine if someone would exploit your code. Depending on your native implementation, someone could easily perform a buffer overrun using the string variable and the CLR couldn't prevent it because it's unmanaged. P/Invoke'd methods are typically wrapped in a class that encapsulates the functionality that you're trying to use in a native DLL. Many classes throughout the .NET Framework Class Library (FCL) - such as every Control in Windows Forms - does this.

Microsoft MVP, Visual C#
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Nik Vogiatzis14-Jun-04 20:56

Nik Vogiatzis

14-Jun-04 20:56

hi all...

i am hoping this is a simple request, but, i have developed a Java web service running under LINUX, and from what i can see, the service is coming up quite nicely... but...

i am using a C# app to call the web service, and i keep on getting a java.rmi.RemoteException coming up during debug, but no info on what that exception has in it...

is there any way of getting the exception message so i can handle it?

cheers and thanks in advance...
nik

Nik Vogiatzis
PhD Candidate: University of South Australia
+++++++++++++++++++++++++++
Developing new generation Traffic Micro-simulation Tools for Traffic Engineers

Heath Stewart15-Jun-04 3:08

15-Jun-04 3:08

Where is the exception occuring? On the client or server? Unless the generated web service proxy also contains a definition of the java.rmi.RemoteException, this information wouldn't be available to the client because that exception doesn't exist in the .NET FCL. The exception on the client should've been wrapped in a generic Exception (typically). Depending on mappings, the Message property may or may not have a message associated with it (other than any generic, default message that might be configured).

Microsoft MVP, Visual C#
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Nik Vogiatzis15-Jun-04 3:14

Nik Vogiatzis

15-Jun-04 3:14

hi heath...

thanks for the quick response...

long story short, the error is occuring at the server end (on a LINUX server running AXIS)...

i would suggest that the web service proxy doesn't have the definition as the Java2WSDL and WSDL2Java are, from my understanding, not designed with .NET clients in mind...

i am wondering 'how' i am meant to go about wrapping the exception, or if there is a better way you could suggest...

thanks again, i appreciate the help...

cheers
nik

Nik Vogiatzis
PhD Candidate: University of South Australia
+++++++++++++++++++++++++++
Developing new generation Traffic Micro-simulation Tools for Traffic Engineers

Heath Stewart15-Jun-04 3:57

15-Jun-04 3:57

You don't wrap it. If an exception occurs, the client should see it, even if it's a generic error wrapped in an Exception class.

If you're getting an exception on the server, you'll simply need to debug what's going on.

There are problems when mixing Java and .NET for web services, typically when you use types that either aren't correctly defined in the WSDL. The class generator (same as wsdl.exe on the command-line) might not be generating the right classes.

Without specifics, it's hard to say.

Microsoft MVP, Visual C#
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Re: HTTP Requests and Posts

Nik Vogiatzis15-Jun-04 12:12

Nik Vogiatzis

15-Jun-04 12:12

hmm... no probs...

please tell what specifics you need that will help you help me...

as for the class itself, the interface is from memory (as the code is at work)...

<br />
public interface SysReport extends (...)<br />
{<br />
   java.lang.String[] runReport(java.lang.String var1,..., java.lang.String[] err);<br />
}<br />

there are whole lot of variables in the middle, which i just can't remember right now, but i will send them once i get to work...

cheers and thanks for your help so far...
nik

Nik Vogiatzis
PhD Candidate: University of South Australia
+++++++++++++++++++++++++++
Developing new generation Traffic Micro-simulation Tools for Traffic Engineers

HTTP Requests and Posts

Richard Beacroft14-Jun-04 20:40

Richard Beacroft

14-Jun-04 20:40

Hi,

I was wondering if anyone has seen an example of how one can send an HTTPWebRequest, passing in a schema to define what information your sending and have an app, aspx? file retrieve process the request and send a response

Kind Regards,
Rik

Heath Stewart15-Jun-04 3:04