C# Discussion Boards - CodeProject

Re: Reflection help - child classes

David Wengier31-Oct-04 17:04

David Wengier

31-Oct-04 17:04

In case anyone cares:

// Create a variable, but from the inherited class, not this base class
Type[] tNested = this.GetType().GetNestedTypes(System.Reflection.BindingFlags.NonPublic);
object rt = null;
foreach (Type t in tNested)
{
    rt = Activator.CreateInstance(t);
    break;
}

--
Dave

Downloader and Install files from the WEB (Like the Windows Updates)

programming31-Oct-04 12:04

programming

31-Oct-04 12:04

Hi everybody.

I'm trying to create a web application with C#.net or C++ like the (windows updates from Microsoft) to let the customer of our company download automatically our executables files from the web and also let the web app automatically the install those files on their computers.

If somebody has any idea of how to do it or any source code about it, I’d appreciate.

Thanks

Ali Hidalgo

Re: Downloader and Install files from the WEB (Like the Windows Updates)

kaptaintens31-Oct-04 13:25

kaptaintens

31-Oct-04 13:25

Well Windows Update uses a service called Background Intelligence Transfer Service (BITS). You can use this to download files or updates, then you'll have to write some code to update your application. Smile | :)

Of course you dont have to use BITS, you can write your own downloader or use WebClient.DownloadData/File if you dont mind it holding up your app... Smile | :)

Dan

Virtual network IPs

bouli31-Oct-04 8:27

bouli

31-Oct-04 8:27

Hi gurus,

With WMI and C#, how can I detect if a network adaptor is a virtual or physical?

Thanks.

Best regards.

There is no spoon.

Re: Virtual network IPs

Dave Kreskowiak1-Nov-04 3:21

Dave Kreskowiak

1-Nov-04 3:21

You can't check for a flag like that, but you can use the available information to POSSIBLY figure it out. Most virtual adapaters will not have an AdapterType in their Win32_NetworkAdapter class. Physical adpaters usually will. For example, you could check each adapter for an "Ethernet 802.3" Adapter Type.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Virtual network IPs

bouli1-Nov-04 4:15

bouli

1-Nov-04 4:15

Hi,

It seems that I have the correct information when I do the following SQL statement on WMI:

SELECT Description, IPAddress FROM Win32_NetworkAdapterConfiguration WHERE ((DHCPEnabled = 'TRUE') AND (IPEnabled = 'TRUE'))

But I don't know if it will work on manually configured ethernet adapters.

When I do a request on Win32_NetworkAdapter class with the AdapterTypeID set to 0 (Ethernet 802.3) I get back the 1394 adapters and a lot of other adatper types while I need only to retrieve physical network Ethernet adapters (no virtual ones).

There is no spoon.

Re: Virtual network IPs

Dave Kreskowiak1-Nov-04 6:21

Dave Kreskowiak

1-Nov-04 6:21

No, it won't. Even VPN adapters can have those properties set to True. Also, not all properties of the class are set by the drivers manufacturers. AdapterTypeID, since it is available in XP and above only, might not be set. It, also, does not support a NULL value, so if it is not set properly, or at all, it defaults to 0. Use the string parameter AdapterType instead.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

SetItemData

bouli31-Oct-04 6:54

bouli

31-Oct-04 6:54

Hi Gurus,

What is the equivalent of the MFC's combo member SetItemData and GetItemDatain C# for combo boxes? Confused | :confused:

Thanks.

Best regards.

There is no spoon.

Re: SetItemData

c#amateur31-Oct-04 11:33

c#amateur

31-Oct-04 11:33

Hi - not a guru here but what I use to populate a combobox is: combobox.Items.Add([value]);
Not sure what you need to use to replace GetItemData I use an equivilency test eg: if([value].Equals(combobox.Text))...ect but there maybe a better way.

Hope this helped Wink | ;)

Re: SetItemData

bouli31-Oct-04 11:38

bouli

31-Oct-04 11:38

Hi,

thanks.

I have found how to add personal data to combo box items Smile | :)

thanks anyway Smile | :)

There is no spoon.

Re: SetItemData

Luis Alonso Ramos31-Oct-04 12:31

Luis Alonso Ramos

31-Oct-04 12:31

bouli wrote:
I have found how to add personal data to combo box items

I don't know if it is what you found out, but you can add any object to a ComboBox, and it's the result of calling that object's ToString() what gets displayed in the ComboBox.

So, just create a little class that contains all your data in public fields (or properties or whatever) and override the ToString()member. Add objects of that class to the ComboBox, and that's it.

-- LuisR

Luis Alonso Ramos
Intelectix - Chihuahua, Mexico

Not much here: My CP Blog!

Re: SetItemData

bouli31-Oct-04 23:54

bouli

31-Oct-04 23:54

Hi,

This is exactly what I have done Smile | :)

There is no spoon.

.xml to .doc,.html,.rtf

makakiu31-Oct-04 5:36

makakiu

31-Oct-04 5:36

Hello everybody. I'm writing from Seville, Spain. I'm trying to build a Test-generator application through a shared add-in hosted in Word, and I need to transform .xml documents to other formats like .doc, .html and .rtf. I'm convinced that possibly there are libraries, components or classes that allow these transformations.
Does anybody know something about this respect??
Has anybody ever been in a similar situation??

Thank u very much

Re: .xml to .doc,.html,.rtf

Christian Graus31-Oct-04 8:26

Christian Graus

31-Oct-04 8:26

xml->html = xslt

Christian

I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer

What's the problem?

momer31-Oct-04 5:15

momer

31-Oct-04 5:15

C# code:
public static System.UInt16 MAKEWORD(byte a, byte b)
{
return (ushort)a | ((ushort)b << 8);
}

when compiling,the error "can not implicitly convert type 'int' to 'ushot'" occur.
what's the problem?

Re: What's the problem?

Stefan Troschuetz31-Oct-04 7:00

Stefan Troschuetz

31-Oct-04 7:00

You'll have to cast the return value.

public static System.UInt16 MAKEWORD(byte a, byte b) 
{ 
	return (ushort)((ushort)a | ((ushort)b << 8)); 
}

www.troschuetz.de

Re: What's the problem?

momer31-Oct-04 7:25

momer

31-Oct-04 7:25

yes,you r right;P
thank you!
momer

Uploade file to server problem!

QzRz31-Oct-04 4:58

QzRz

31-Oct-04 4:58

Hi...

I have made an xml document, and uploaded it to a server...
my problem is how to uploade it again after i downloaded it..!

When i download it i do this... (not sure this is the best way to do it)

string path = @"http://www.whatever.com/web/MyFile.xml";
WebClient DLoad = new WebClient();
DLoad.DownloadFile(path, "MyFile.xml");

that works fine...!

But then when i want to uploade the file..
I have no idea how to do however i tried this...

WebClient ULoad = new WebClient();
string path = @"http://www.whatever.com/web/MyFile(1).xml";
ULoad.UploadFile(path, "MyFile.xml");

But it throws an "'System.Net.WebException' occurred in system.dll -
Additional information: The remote server returned an error: (405) Method Not Allowed."

I have no idea what to do now....
Need a way to upload the file to the server.... or to write to the xml that already is on the sever...!

Can anyone help me please...?

Thanks....!

QzRz

bound control looses changes after leaving panel

Peter Kiesel31-Oct-04 3:25

Peter Kiesel

31-Oct-04 3:25

Hi All,
I have bound textboxes and other controls on a panel. If I edit the text in a textbox and move on to another control, everything works fine and I can use
HasVersion(DataRowVersion.Proposed)
to determine if there have been any changes to any control.
BUT, if I make only a single change to one text control and leave the panel afterwards by clicking into another panel on the screen, the proposed version flag is not set and I'm missing to save the change to the underlying dataset and database.

Binding:
txtCode.DataBindings.Add("Text", m_vProject, "code");
...
and after leaving the panel:
BindingManagerBase bm = BindingContext[m_vProject];
cPrjDs.tProjectRow prjRow = (cPrjDs.tProjectRow)(((DataRowView)bm.Current).Row);
if (prjRow.HasVersion(DataRowVersion.Proposed)) {
if (MessageBox.Show("save changes?", "header", ...)) {
bm.EndCurrentEdit();

To my understanding, it would be possible to catch the TextChanged event of the control and start DataRow.BeginEdit(), but this does not seem to be a practical solution for lots of controls.

Thanks for any help.

Peter

Overflow exception

Ahmed Galal31-Oct-04 1:26

Ahmed Galal

31-Oct-04 1:26

when i make a new windows application project and put in the main webform any control like a Button, the application throws overflow exception, but if i tried to run the application without making anychanges the application will run without exceptions, i think the problem isn't in the control because after i got the exception i removed the control from the webfrom but i still have the same error, i don't know why i got this exception while am setting the Checking Overflow/Underflow to false in the project Build properties,

anyone have suggestions ?

thanx in advance .

Re: Overflow exception, a question

yoaz31-Oct-04 2:20

yoaz

31-Oct-04 2:20

SomeOne_SurVive wrote:
when i make a new windows application project and put in the main webform
is it webform, or a windows form?

there are no facts, only interpretations

Re: Overflow exception, a question

Ahmed Galal31-Oct-04 21:49

Ahmed Galal

31-Oct-04 21:49

sorry, its a windows form , not a webform

DataSet - scalability

devvvy30-Oct-04 23:14

devvvy

30-Oct-04 23:14

Hi, just want to know what you guys do when you wish to populate DataGrid with DataSet consisting ALL customer records BUT not wanting to load ALL customers records into DataSet (or in other words, memory). For example,

DataSet dsCustomers = new DataSet();

//That's not good, you're potentially loading enough records into memory to bring down your application server.
SqlDataAdapter daCustomers = new SqlDataAdapter(
"select * from Customers", conn);

daCustomers.Fill(dsCustomers, "Customers");

dgCustomers.DataSource = dsCustomers;
dgCustomers.DataMember = "Customers";

Thanks!

Norman Fung

Re: DataSet - scalability

Alex Korchemniy31-Oct-04 9:40

Alex Korchemniy

31-Oct-04 9:40

AFAIK the DataGrid has no way of dynamically loading data. There might be another grid implementation that does support...

Anyway, loading all your customers into a grid isn't a good UI practice. Its impossible to navigate that much information and make use of it. I recommend that you rethink your design to minimize the data to exactly what the user wants to see. Just a suggestion. Smile | :)

This posting is provided "AS IS" with no warranties, and confers no rights.

Alex Korchemniy

Re: DataSet - scalability

devvvy31-Oct-04 16:49

devvvy

31-Oct-04 16:49

Yes, I can ask user to specify a WHERE clause, but solution would be nicer if I dont have to. I think you're right though - the whole point of DataSet is grab all data from SQLAdapter and work disconnected from data source - propagating changes only back to source only when you're all done in the end.

DataGrid.DataSource is anything that implements IEnumerable - Classes that implements this interface includes DataView, ArrayList, and Hashtable. IEnumerable includes one interface method:

IEnumerator GetEnumerator();

Which returns IEnumerator interface - which includes three interface methods:
1. object Current {get;}
2. bool MoveNext();
3. void Reset();

I think one can implement their own IList class, which resembles this:

class CustomerList : IList {
protected int _count=0;
protected Customer _current=null;

protected SQLConnection _con=null;
protected String _sql=null;

public CustomerList(String sql, ref SQLConnection con) {
_sql=sql;
_con=con;
}

property Object Current {
get {return _current;}
}

property int Count {
get {return _count;}
}

bool MoveNext() {
...grab directly from database everytime...
Customer cs=null;
int currentUIN=_current.getUIN() +1;

String filter=" WHERE UIN=" +currentUIN;
String sql=_sql +filter;
SqlCommand cmd= new SqlCommand(sql, _con);
_con.Open();
SqlDataReader rdr= cmd.ExecuteReader();
if(rdr.Read()) {
cs=new Customer();
cs.UIN=currentUIN;
cs.login=res.GetSqlString();
cs.email=res.GetSqlString();
... the rest of it...

_current=cs;

_con.Close();

//Get total count: "SELECT COUNT(*) FROM Customers"
... implementation ...

return true;
} else {
return false;
}
}

void Reset () {...}
}

Then, consuming it:

SQLConnection con=...;
String sql="SELECT * FROM CUSTOMERS;"
MyArrayList customerList= new MyArrayList(sql, con);
dgCustomers.DataSource = customerList;

Of course, you don't get the convenience of SQLDataAdapter.Update(), which propagate changes back in a batch --- ... is it possible to blend DataSet (100% disconnected) and CustomerList (100% connected, grab data as you go) and have the better of the two...

Norman Fung

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