How to Activate A Control Added to Desktop - .NET (Core and Framework) Discussion Boards

Andy,

From what I follow, you need a mix of MBR, MRV. For this, I can only think of creating a MBR descendant object which implements ISerializable (or mark as Serializable). This way, you start with an MBR object on the server and when the client requests for the instance (perhaps identified with an Guid?), the server serializes the object and returns it.

But, do note that MBV is usually recommended only for light weight objects.. since the whole object is being passed across.

Thanks,
Nitin

namaste,
Nitin Koshy
http://devwaves.blogspot.com
...and I thought I knew

Yes thanks Nitin. I am also looking at customised serialisation too - I've got some learning to do in this area.

I will try what you suggest and I am aware of the size limitation for MBV - the idea is to serialize pieces of the object model to and from the client and not the whole thing in one go, but do this only where necessary and only for writeable objects.

I know there are a whole load of data integrity issues too but that another story.

Andy

Once i convert the Winhelp to Html Help i am able to get only the .htm and .hhk files. I am not able to get the .hhc(contents file).Does the file size matter while converting or could there be any other problem??????

ASHA

-- modified at 4:45 Wednesday 27th June, 2007

ASHA

We store our source code in MS SourceSafe. For common classes and functions we are not sure where to store the .dll for access by other applications etc. For example we have a database class that connects to any of the corporate DBs...
Any one have any architechture ideas

tri595 wrote:
For common classes and functions we are not sure where to store the .dll for access by other applications etc.

Keep those DLLs in GAC. Rose | [Rose]

Thanks... we keep the source code in MS SourceSafe and we wanted to put the Dlls in a secure location for access by another application.. they will be in the GAC when we deploy the application anyhow.. what benefit does this give?

http://www.codeproject.com/dotnet/DemystifyGAC.asp?df=100&forumid=15829&exp=0&select=836626[^]

Vasudevan Deepak Kumar
Personal Homepage
Tech Gossips

I have Created A ListBox Control Whose Handle is Desktop.

My code for ListBox:

#using <mscorlib.dll>

using namespace System;

using namespace System::ComponentModel;

using namespace System::Collections;

using namespace System::Windows::Forms;

using namespace System:ata;

using namespace System:rawing;

using namespace System::Runtime::InteropServices;

using namespace System::Security::Permissions;

namespace DeskTopTest

{

///

/// Summary for MyListBox

///

// Requires unmanaged code

[assembly: SecurityPermissionAttribute (SecurityAction::RequestMinimum, UnmanagedCode=true)];

// Requires ability to create any window type

[assembly:UIPermissionAttribute(SecurityAction::RequestMinimum, Window=UIPermissionWindow::AllWindows)];

public ref class MyListBox : public ListBox

{

public:

MyListBox(void)

{

}

protected: virtual property System::Windows::Forms::CreateParams^ CreateParams

{

virtual System::Windows::Forms::CreateParams^ get() override

{

const int WS_EX_TOOLWINDOW = 0x00000080;

const int WS_EX_NOACTIVATE = 0x08000000;

const int WS_EX_TOPMOST = 0x00000008;

try

{

System::Windows::Forms::CreateParams ^p =ListBox::CreateParams;

p->ExStyle |= (WS_EX_NOACTIVATE | WS_EX_TOOLWINDOW | WS_EX_TOPMOST);

p->Parent = IntPtr::Zero;

return p;

}

catch (Exception^ e)

{

return nullptr;

}

}

}

public:[DllImport("user32.dll")] static int SetParent( IntPtr hWndChild, IntPtr hWndNewParent);

[DllImport("user32.dll")] static int ShowWindow( IntPtr hWnd, int nCmdShow);

[DllImport("user32.dll")] static IntPtr GetDesktopWindow(void);

public: void ShowFloating()

{

if (this->Handle == IntPtr::Zero)

{

ListBox::CreateControl();

}

//IntPtr s=GetDesktopWindow();

int x=SetParent(ListBox::Handle, IntPtr::Zero);

x=ShowWindow(ListBox::Handle,1);

}

protected:

virtual void WndProc(Message% m)override

{

ListBox::WndProc(m);

}

};

}

but when i Added this listbox to my form like:

MyListBox ^lst=gcnew MyListBox();

lst->Location=System:rawing::Point(264, 166);

lst->Name = L"comboBox1";

lst->TabIndex = 1;

lst->Visible=false;

lst->Size = System:rawing::Size(171, 200);

for (UInt16 i=1;i<100;i++)

{

lst->Items->Add("Item"+i.ToString());

}

lst->ShowFloating();

and calling the function ShowFloating();

It is working fine.

But I cant unable to focus On my Listbox & cant able to use my mouse events.

I want to focus on listbox.

Plz Suggest me .........

Thanks in advance

Nagaraju

Hi,

I'm writing a C# windows application program that needs to connect to the SQL server 2000 or SQL 2005. What i want to do is when the user selects to connect to the server, a pop-up window appears that opens the data connection wizard where the can go through the wizard and connect to the sql servers are any other servers. Is this possible? If so, can someone please tell me how to do this?

Prompt the user for the server,Database,username, password. Prepare the connection string internally, connect using SqlConnection.

For enumerating the list of database, servers, use DMO or the new variant SMO

namaste,
Nitin Koshy
http://devwaves.blogspot.com
...and I thought I knew

Hello,
Do you know a good resource which would describe possible situations that can leed to memory leaks? such as eventhandlers to objects that are no more needed and forms that aren't disposed after closing. Any article that would describe such situations and how to prevent them? Thanks

#region signature
my articles
#endregion

The only resource I know of is experience, or the tried and true technique of "trial and error".

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

Dave Kreskowiak wrote:
The only resource I know of is experience, or the tried and true technique of "trial and error".

Know that feeling :->

Dave Kreskowiak wrote:
The only resource I know of is experience, or the tried and true technique of "trial and error".

So you say that there is not any article in the internet on that subject?

#region signature
my articles
#endregion

He's saying he doesn't know of one.

Doing a search on google returns lots of results but I don't know if any of them are any good:

http://www.google.co.uk/search?hl=en&q=c%23+memory+leaks&meta=[^]

originSH wrote:
He's saying he doesn't know of one.

Thank you!

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007

np

Hello,
How can I build a IP lan scanner in .net(vb.net/c#)?
It should give the list of all computers/devices in the network, and their relative IPs and (eventually) MAC Address and device/computer name.
Thanks in advance, Wink | ;)

Carmine,
Webmaster of: www.thetotalsite.it
My web blog: blog.thetotalsite.it

http://www.codeproject.com/cs/internet/host_info_within_network.asp?df=100&forumid=146669&exp=0&select=1498979

Mhm but that program displays only PCs based on Windows.
Is there a way to display all network devices? (network printers, routers, PCs with Linux/MAC etc.)?

Carmine,
Webmaster of: www.thetotalsite.it
My web blog: blog.thetotalsite.it

You can use System.Net.NetworkInformation.Ping[^] to ping, is machine a live, after that you can use System.Net.Dns[^] to retrieve host name.

I have a slightly different problem, I have a generic function that handles populating all the properties of a class and all it's inhreited class objecs. Such as this:

public static List<iperson> TGeneratePersonList(IDataReader oDR, ePersonType PersonType)
{
ArrayList oCols = Field.GetColumnNames(oDR);
oCols = Utilities.Field.GetColumnNames(oDR);
iPerson oP = null;
List<iperson> oPList = new List<iperson>();
while (oDR.Read())
{
switch (PersonType)
{
case ePersonType.Basic:
oP = new Person();
break;
case ePersonType.Contract_Person:
oP = new Contract_Person();
((Contract_Person)oP).Contract_Person_ID = Field.GetInt(oDR, "Contact_ID");
break;
case ePersonType.Vendor_Person:
oP = new Vendor_Person();
break;
}
oPList.add(oP);
}
return oPList;
}

THe problem is when I try to assign this result to a property of an object deined as :
public List<vendor_person> Personnel_List
{
get
{
if (this._Personnel_List == null)
this._Personnel_List = new List<vendor_person>();
return this._Personnel_List;
}
set
{
this._Personnel_List = value;
}

}

I get this at compile time:
Error 4 Cannot implicitly convert type 'System.Collections.Generic.List<projectcentral.contacts.iperson>' to 'System.Collections.Generic.List<projectcentral.contacts.vendor_person>' C:\Projects\ProjectCentral\ProjectCentral.Vendors\GenericVendor.cs 281 39 ProjectCentral.Vendors

Any ideas? It's rather urgent since I've been fighting with this for days and my job is on the line.

THanls;

You need to pre-define the type for the generic List class to the type of the object that will be populating it i.e. iPerson so assuming classes Person, Contract_Person and Vendor_Person are all derived from iPerson your code needs to change to the following:

public static List<iPerson> TGeneratePersonList(IDataReader oDR, ePersonType PersonType)
{
...

iPerson oP = null;
List<iPerson> oPList = new List<iPerson>();

...
}

and your property to:

public List<iPerson> Personnel_List
{
...
}

and the field _Personnel_List to:

private List<iPerson> _Personnel_List;

Incidentally, the TGeneratePersonList() is not a generic method - it is an ordinary method that returns a generic List of type iPerson.

This is a generic method:
public void GenericMethod<T>() // Where type T is defined when the method is called
{
// Do something with T in here
}

example calls

GenericMethod<int>();
GenericMethod<string>();
GenericMethod<MyClass>();

With this scenario I would have to cast property Personnel_List everytime I need to get a property value from one of the derived objects. Doesn't this defeat the purpose of Generics? I guess I'm trying find the most efficient and scalable way to do this.

I tried a different approach as follows. I can't seem to find a way to have the Base class properties populated without having to re-wite the property assignment code in the derived classes.
Anyone encountered this before?

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
B objB = new B();
List oBList = new List();
objB.GenerateList(ref oBList);

}
}

public interface iClass
{
string Full_Name
{
get;
set;
}

string Short_Name
{
get;
set;
}
}

public class A : iClass
{
private string _PhoneA = "";
private string _Full_Name = "";
private string _Short_Name = "";

public string PhoneA
{
get { return _PhoneA; }
set { _PhoneA = value; }
}

public string Full_Name
{
get { return _Full_Name; }
set { _Full_Name = value; }
}
public string Short_Name
{
get { return _Short_Name; }
set { _Short_Name = value; }
}

public virtual void GenerateList(ref List List)
{
A objA = new A();
objA.Full_Name = "Tom";
List.Add(objA);

objA = new A();
objA.Full_Name = "Bob";
List.Add(objA);

objA = new A();
objA.Full_Name = "Gerry";
List.Add(objA);

}

}

class B : A, iClass
{
private string _SSN = "";

public string SSN
{
get { return _SSN; }
set { _SSN = value; }
}

public new void GenerateList(ref List List)
{
base.GenerateList(ref List);

foreach (B oB in List)
{
oB.SSN = "123";
}

}
}
}

Maybe I am missing the point somewhere but I cannot see why you need to use generics to do this.

In my previous example by placing all the initialisation properties into iPerson for example would enable you to initialise all classes derived from iPerson i.e.

// Interface that defines properties and methods to be called during initilaisation
public interface I
{
string Prop1 { get; set; }
int Prop2 { get; set; }
void Initialise(params object[] arrParams);
}

// Classes to be initialised
class A: I
{
private string _prop1 = null;
private int _prop2;

// Interface implementations
string I.Prop1
{
get { return _prop1; }
set { _prop1 = value; }
}

int I.Prop2
{
get { return _prop2; }
set { _prop2 = value; }
}

void I.Initialise(params object[] arrParams)
{
// Do some initialisation on params
Initialise(arrParams);
}

// Option for in class initialisation - could use virtual.
protected abstract void Initialise(params object[] arrParams);
}

class B: A
{
protected override void Initialise(params object[] arrParams)
{
}
}

class C: B
{
private string Prop3 = null;

protected override void Initialise(params object[] arrParams)
{
}
}

Now using interface I to initialise instances of A, B or C as follows:
//Create list
List<I> items = new List<I>();

// This could equally be:
// ArrayList items = new ArrayList();
....
if (ClassType == eType.A)
{
items.Add(new A());
}
else if (ClassType == eType.B)
{
items.Add(new B());
}
else if (ClassType == eType.C)
{
items.Add(new C());
}

// Initialisation can be performed on object instances of type A, B and C this way using interface I no casting required.
foreach (I item in items)
{
// Initialise object properties
item.Prop1 = source.P1;
item.Prop2 = source.P2;

//Or even call an initialise method on the object itself.
item.Initialise(source.P1, source.P2, "P3");
}

This example relies on a single interface structure defined at compile time, this is also a requirement that applies to generics - if what you are looking for is to try and initialise objects by examining their structures at run-time then this falls into the realms of Reflection - and only do this if for some reason you really need to.

If you are requiring to initialise properties that apply to the derived classes (i.e class C)
you could used the Initialise() method shown but you would have to either apply strict parameter ordering or employ a mechanism for identifying which parameter goes to which property.