Re: Combobox - Add Object's name property, not Object's name - C# Discussion Boards

Dave Kreskowiak4-Jun-05 15:58

4-Jun-05 15:58

Your datasource is local to the server. ASP.NET is a server-side only technology that generates HTML for a client. Change your "Data Source" so your code is looking for it local to the server filesystem, not over an http connection.

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

caputring a textbox

Anonymous4-Jun-05 9:21

Anonymous

4-Jun-05 9:21

Ok, I'm trying to capture text from a texbox inside of another program. In other words, I have a window handle of an exterior program. This program contains a textbox. I would like to capture that text. Is there a set of API commands that would enable me to do this? I've been looking on MSDN for a while and haven't found anything. Any help would be greatly appreciated. Until then, the searhc continues...

Re: caputring a textbox

MoustafaS4-Jun-05 11:38

MoustafaS

4-Jun-05 11:38

Try :

<a href="http://www.pinvoke.net" rel="nofollow">http://www.pinvoke.net</a>[<a target=_blank title='New Window' rel='nofollow' href="http://www.pinvoke.net">^</a>]

Re: caputring a textbox

eggie54-Jun-05 11:51

eggie5

4-Jun-05 11:51

Use the win api SendMessage twice first with WM_GETTEXTLENGTH then again with WM_GETTEXT. GO ahead and try it yourself with the example at pinvoke.net. If you still can't get it to work just let me know.

/\ |_ E X E GG

foreign windows: position and size of minimize button

FreeClimber4-Jun-05 9:18

FreeClimber

4-Jun-05 9:18

Hello,

It's easy to get a pointer to the window of all running applications. But i need to find out the position and the size of the minimize button outgoing from the pointer to this application window.

Anybody know if this is possible or knows how to do this?

Thanks for help.

FreeClimber

Combobox - Add Object's name property, not Object's name

Seraphin4-Jun-05 7:35

Seraphin

4-Jun-05 7:35

I have a class "Person"

Person has 2 propertys:

Name
Adress

Person p = new Person();
p.Name = "Mike";
p.Adress = "Anywhere";

Now I have a problem with adding it to the Combobox.
In the Combobox list, I only see [namespace].Person all the time, not "Mike".

There are possibilities through indexes, Hastables ... and so on..., but are these the only possibilities ?
Is there a way to add the object to combobox directly ?

Re: Combobox - Add Object's name property, not Object's name

Carsten Zeumer4-Jun-05 7:42

Carsten Zeumer

4-Jun-05 7:42

You could override the ToString() method of you Person class.

public override string ToString()
{
	return this.Name;
}

/cadi

Re: Combobox - Add Object's name property, not Object's name

Seraphin4-Jun-05 8:10

Seraphin

4-Jun-05 8:10

The problem is still the same. with ToString, I only put the string in the combobox, not the object itself.

So the object should be added into the combobox and the Combobox Item description shouldn't be the objects name.

Re: Combobox - Add Object's name property, not Object's name

Carsten Zeumer4-Jun-05 8:21

Carsten Zeumer

4-Jun-05 8:21

No, you do not!
You add the object and the Combobox uses the to String method of the items to display a text.
Try this:

<code>
private void Form1_Load(object sender, System.EventArgs e)
{
	this.comboBox1.Items.Add(new Person());
	foreach(object o in this.comboBox1.Items)
		MessageBox.Show(String.Format("Item is of type {0} and is the persons name is {1}",o.GetType().FullName, (o is Person) ? ((Person)o).Name : "not a person") );
}

it works fine in my test.

/cadi

24 hours is not enough

Re: Combobox - Add Object's name property, not Object's name

DavidNohejl4-Jun-05 8:21

DavidNohejl

4-Jun-05 8:21

cadi said it right. ComboBox actually calls ToString() method of it's Items. For your class default ToString() returns string representation of type. When you override ToString(), combobox will display Person.Name field, but e.g combobox.SelectedItem can still be instance of Person.

David

Re: Combobox - Add Object's name property, not Object's name

Seraphin4-Jun-05 8:33

Seraphin

4-Jun-05 8:33

Thx, this works.
I added .ToString directly before.

table-level topological sort problem

erdsah884-Jun-05 5:28

erdsah88

4-Jun-05 5:28

I have a problem with UnitofWork.I have many objects in my UnitofWork but the problem is I dont have an update order in my hand.in an article it said....."the key to the puzzle is table-level topological sort".

What does this mean? thanks

XML Manipulation

Member 17843034-Jun-05 3:44

Member 1784303

4-Jun-05 3:44

Hi {
I have to Generate an XML file from an existing XML.
The existing File is on HDD and and the Elements of the file are shown in a Tree view.
Now when the tree node is selected the child nodes are displayed in the checked List Box.
}Done
Now the selected chiled nodes along with its coressponging Paret node in tree view will be writen to another XML file.
Does any one have SAMPAL code for this task or can any one giude me.
Thanks.
Best Regards.

Selecting directory and file together from OpenFileDialog

Anonymous4-Jun-05 3:15

Anonymous

4-Jun-05 3:15

Is it possible to write code for selecting a folder and a file together from OpenFileDialog? The default operation appears only selection of a file.

Changing name of "Open" button in OpenFileDialog

Anonymous4-Jun-05 3:10

Anonymous

4-Jun-05 3:10

Is it possible to change the name of the "Open" button in the OpenFileDialog class instance in C# application?

Re: Changing name of "Open" button in OpenFileDialog

Dario Solera4-Jun-05 4:07

Dario Solera

4-Jun-05 4:07

no because it is declared 'sealed' so you cannot inherit from it or modify it.

in the msdn library you can see this:

public sealed class OpenFileDialog : FileDialog

Re: Changing name of "Open" button in OpenFileDialog

MoustafaS4-Jun-05 4:18

MoustafaS

4-Jun-05 4:18

I did it once,:->
But that was because i created my own open file and open forlder dialog from the scratch.

Re: Changing name of "Open" button in OpenFileDialog

Andy Moore6-Jun-05 7:58

Andy Moore

6-Jun-05 7:58

It is possible but you have to use P/Invoke to create this dialog from scratch using the GetOpenFileName() call and the OPENFILENAME structure from the Win32 platform SDK on MSDN. In the OPENFILENAME structure specify a hook procedure for the lpfnHookProc data item. In this hook procedure capture the WM_INITDIALOG message, get the handle to the OK button, and call SetWindowText to change the name from "Open" to something else.

I hope this helps.

Human beings were not meant to sit in little cubicles staring at computer screens all day, filling out useless forms and listening to eight different bosses drone on about about mission statements. -- Peter Gibbons

How to update value in Hashtable

Member 20184464-Jun-05 0:09

Member 2018446

4-Jun-05 0:09

Hi,

I want to update the value for a particular key in Hashtable.
How to update.

Usually in VB 6, i have used item property. But here i unable to use it

Thanks in Advance

Balamurugan

Re: How to update value in Hashtable

Colin Angus Mackay4-Jun-05 0:22

Colin Angus Mackay

4-Jun-05 0:22

myHashtable["someKey"] = newValue;

If "someKey" does not exist then a new key will be created with the newValue.

Does this help?

My: Blog | Photos
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Doubt regarding usage of 'this'

manivannan.p3-Jun-05 23:54

manivannan.p

3-Jun-05 23:54

Hi,

I am a beginner level programmer and I would be happy
if somebody can clarify me this small doubt.

I want to know,if using 'this' to refer to the local variables inside a class is a good practice. using 'this' would be a bit costly or it would infact aid performance ?

Please clarify this , would be more thankful if you can give me some links for improving code performance.

Thanks a ton.

Re: Doubt regarding usage of 'this'

S. Senthil Kumar4-Jun-05 0:06

S. Senthil Kumar

4-Jun-05 0:06

It doesn't make any difference. Whether you explicitly use "this" or not, the compiler generated code will have to use it to refer to member variables and methods.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Re: Doubt regarding usage of 'this'

WillemM4-Jun-05 0:08

WillemM

4-Jun-05 0:08

As far as I know, it doesn't hurt or boost the performance. It's rather a question of taste. Do you like the style of using 'this' for calling private variables ?

In my opinion it doesn't matter if you use 'this', but I prefer only using it when there's no other way. An example:

private int var;<br />
<br />
public SomeClass(int var) {<br />
    this.var = var;<br />
}

WM.

What about weapons of mass-construction?

Re: Doubt regarding usage of 'this'

Colin Angus Mackay4-Jun-05 0:21

Colin Angus Mackay

4-Jun-05 0:21

A local variable is one which is within the scope of the method or property, not the class. I think what you mean is member variable (aka field in .NET)

Using the this keyword is just making explicit what the compiler will do implicitly anyway. There is no perfomance advantage to using it or not as the resulting code will be compiled to be the same anyway.

The only time where it does make a difference is where you have a local variable and a member variable with the same name. You must use the this keyword to refer to the member variable in that instance otherwise the compiler will assume you are referring to the local variable.

Does this help?

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Re: Doubt regarding usage of 'this'

Carsten Zeumer4-Jun-05 7:50

Carsten Zeumer

4-Jun-05 7:50

There is no difference in the created IL code wether you use this or not.
(try Lutz Röders excelent Reflector tool to check this).
(field accesses will always resolve to a ldfld opcode and method calls to call or callvirt)

I personally changed my way of using the this keyword.
I started by not using it at all beeing happy not to have to use it as in the old c++ days...
Then i switched to use it on fields and properties. Simpy for readability.
Now i went as far as using it for method calls too.

Even though it seems a little overdone i think the code readability gains a lot.
Especially for everyone who has not written the code but is reading it.
By using the this keyword it is immediatly clear that you refere to a member of the current class.

Currrently i am not as far as using the base keyword for any derieved method.

As long as a method, field or property is not ambigious it is completely up to you and your personal style whether you use the this keyword or not.

/cadi

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