Instantiating a class of type x at runtime - C# Discussion Boards

jk chan25-Jun-04 1:10

25-Jun-04 1:10

Hi Friends

I Get some Problems on datagrid.. I want to make it multiple column selection. I did it by handling all the painting. But the painting fails when some Columns are partially displayed(Hopes u can understand, if not pls Ask.)

So if anyboady knows How to check a column fully visible pls help me Smile | :)

Thanks in Advance
bye
Krishnadevan

If u can Dream... U can do it..

Re: Some Problems on DataGrid :-

Heath Stewart25-Jun-04 5:03

Heath Stewart

25-Jun-04 5:03

When you're drawing your column, check the DataGrid.Right property. If it's less than your column's right side, then subtract the difference; if not, draw the whole column (cell, actually) as highlighted (or whatever you're doing).

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Re: Some Problems on DataGrid :-

jk chan25-Jun-04 20:22

jk chan

25-Jun-04 20:22

Thanks for reply..
It will now work fine Smile | :)

If u can Dream .. U can do it..

Scrollbar

_Searcher_25-Jun-04 0:21

_Searcher_

25-Jun-04 0:21

Hi.
I have a side bar with a menu in an iframe, this sidebar is is very long (heigh). When I click on a button at the bottom of the menu, it reloads and gos up to the top. I want the srollbar to stay at the bottom when I click on this button.

Can I somehow use the (not) IsPostBack on the button? How can I do this?

Thanks!

-- Evil geniuses for a better tomorrow --

Re: Scrollbar

Heath Stewart25-Jun-04 5:01

Heath Stewart

25-Jun-04 5:01

For starters, this belongs in the ASP.NET forum. If you don't want the button to post back, however, then don't make it a server control. A simple button element with an onclick handler will do. If you need more information, ask in the appropriate forum.

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Re: Scrollbar

Wender Oliveira25-Jun-04 10:22

Wender Oliveira

25-Jun-04 10:22

You need some javascript function because each postback is a submit in your page. I was with this problem but with linkbutton and I solved it without js just by setting href="" and not href="#" like I did... but it was a linkbutton! Good luck!

Wender Oliveira
.NET Programmer

Re: Scrollbar

partyganger25-Jun-04 14:22

partyganger

25-Jun-04 14:22

just add a regular HTML button input type to the html, and don't rely on the designer to much...:

<br />
<input type="button" onclick="CallSomeJavaScriptFunctionHere()" /><br />

JS code (just googled for it...

<br />
function scrollToBottom() { <br />
         document.body.scrollTop = document.body.offsetHeight; <br />
      } <br />
<br />
      function checkIfScrollToBottomIsNeeded() { <br />
         scrollToBottomIsNeeded = ( document.body.scrollTop >= ( document.body.offsetHeight - ( window.innerHeight * 1.2 ) ) ); <br />
      } <br />
<br />
      function scrollToBottomIfNeeded() { <br />
         if( scrollToBottomIsNeeded ) <br />
            document.body.scrollTop = document.body.offsetHeight; <br />
      } <br />

Instantiating a class of type x at runtime

Anonymous24-Jun-04 23:08

Anonymous

24-Jun-04 23:08

Hi,

I cannot find how to create a class at runtime...

if I know the type of the object, and need to create an instance..

foo myObject = new foo();

Type t = myObject.GetType();

// how do I create a new object of type t ??

Re: Instantiating a class of type x at runtime

Stefan Troschuetz24-Jun-04 23:44

Stefan Troschuetz

24-Jun-04 23:44

Take a look at the Activator.CreateInstance method.

www.troschuetz.de

Re: Instantiating a class of type x at runtime

shaunAustin28-Jun-04 0:29

shaunAustin

28-Jun-04 0:29

The way i tend to do it is to get the constructor (usually the parameterless one) and call invoke on it using reflection..

<br />
Type t = ....<br />
<br />
ConstructorInfo constructor = t.GetConstructor(System.Type.EmptyTypes);<br />
<br />
object newObject = constructor.Invoke(null);<br />

-----------------------------------------------------------------------
Shaun Austin: .NET Specialist. Spreading the word of .NET to the world... well the UK... well my tiny corner of it!! Big Grin | :-D

Dynamically giving color to the datagrid

HowRU24-Jun-04 23:02

HowRU

24-Jun-04 23:02

Hi ,
I want to give the color to the particular row of the datagrid at runtime....when....the template column is clicked....so i want to give the backcolor to the entire row at that time that means runtime....

In datagird I have a one column which is a template column...

i have tried like this but this is giving color to the row permanently.....& want to change its color as & when that row's template column clicked....please help me

for(int i=0; i < DGPODetailShow.Columns.Count;i++)
{
DGPODetailShow.Items[0].Cells.[i].BackColor=System.Drawing.ColorTranslator.FromHtml("#EBE5DE");

}

Can anybody help me....
Thanks

Re: Dynamically giving color to the datagrid

Heath Stewart25-Jun-04 4:58

Heath Stewart

25-Jun-04 4:58

This question belongs in the ASP.NET forum. I'll give you a hint, though: read about ViewState.

Microsoft MVP, Visual C#
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MSN6 messenger development

softp_vc24-Jun-04 22:54

softp_vc

24-Jun-04 22:54

Hi all,

im new to this forum.

i have one issue, i want to do the programming in MSN6 messenger in C#.
do anybody has the idea from where i can get the library, functions for researching for the MSN6 messenger.

its urgent, please help me out.

thanx a lot in advance

Naveen

Re: MSN6 messenger development

amatyasik25-Jun-04 2:05

amatyasik

25-Jun-04 2:05

Hi !
Search on the codeproject site (with the "msn" keyword), they're some articles.
And on the msdn site

Bye Smile | :)

programming for the MSN6 messenger

softp_vc24-Jun-04 22:35

softp_vc

24-Jun-04 22:35

Re: programming for the MSN6 messenger

Colin Angus Mackay24-Jun-04 22:58

Colin Angus Mackay

24-Jun-04 22:58

Well, I just googled for it and discovered I need not have gone so far. The top item in Google's search was right back here at Code Project.

http://www.codeproject.com/com/msn_messenger.asp[^]

Although this example is in in C++, I don't think it would take much to translate it to C#

"You can have everything in life you want if you will just help enough other people get what they want." --Zig Ziglar

The Second EuroCPian Event will be in Brussels on the 4th of September

Can't manage to P/Invoke that Win32 API in .NET? Why not do interop the wiki way!

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Re: programming for the MSN6 messenger

Jeremy Kimball25-Jun-04 2:59

Jeremy Kimball

25-Jun-04 2:59

You have to love how cyclical life can be sometimes.... Smile | :)

Jeremy Kimball

I have traveled the gutters, lo these many days, with no signs of life. Well met.
-brianwelsch

Re: programming for the MSN6 messenger

Heath Stewart25-Jun-04 4:56

Heath Stewart

25-Jun-04 4:56

...and how Google can find many solutions in most cases; now if only the majority of others would realize that. Sigh | :sigh:

Microsoft MVP, Visual C#
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Re: programming for the MSN6 messenger

Dave Kreskowiak25-Jun-04 5:24

Dave Kreskowiak

25-Jun-04 5:24

Well, you could also try going to the References folder of your project and Add Reference to the COM library "Messenger API Type Library". You'll have to declare an object of type MessengerAPI.Messenger or something close to that. I don't exactly know what it would be because I don't use MSN or have Messenger installed.

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

? Access controls belonging to another application

catalin_im24-Jun-04 22:33

catalin_im

24-Jun-04 22:33

Hello!
I wonder if there is a way to access the properties of the controls of another application's forms at runtime...
For example, i want my application to monitor wether a checkbox on another application's form has or has not been checked.
A non-.NET solution would also be useful.
If anyone has ideas, please reply!
10x!

Re: ? Access controls belonging to another application

Jeremy Kimball25-Jun-04 3:11

Jeremy Kimball

25-Jun-04 3:11

You're likely looking at using Win32 API P/Invoked calls to FindWindow and GetWindowLong. How comfortable are you with the old APIs?

Jeremy Kimball

I have traveled the gutters, lo these many days, with no signs of life. Well met.
-brianwelsch

Re: ? Access controls belonging to another application

Dave Kreskowiak25-Jun-04 5:10

Dave Kreskowiak

25-Jun-04 5:10

There is no easy way of doing this and no support it in the .NET BCL. Like Jeremy said, "How comfortable are you with the Win32 API?" You'll need to have an in depth knowledge of how windows and controls work and how to pass messages to these windows to get information back from them.

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

Re: ? Access controls belonging to another application

catalin_im27-Jun-04 20:46

catalin_im

27-Jun-04 20:46

I have made some 'research' based on Jeremy's suggestions and, indeed, there is no easy way to do that since I'm not very familiar with the Win32 API. I guess i'll wait for future managed implementations..
Thanks anyway!

Re: ? Access controls belonging to another application

Dave Kreskowiak28-Jun-04 0:39

Dave Kreskowiak

28-Jun-04 0:39

Not likely going to happen. What you want to do is difficult because most of the time you have to write custom code to even find the window your looking for, then not all windows are going to expose their properties the same way. Some you can get through send message back and forth, others you have to cast a point to the Win32 Class (not the .NET Framework class!) to get at the properties.

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

DataSet

Sirin24-Jun-04 22:18

Sirin

24-Jun-04 22:18

My problem: i have this table, with about 10 to 20 thousand records; applying a rowfilter on a dataview for this table works kind of nice; the thing is that when I have no records matching the given criteria, applying the filter takes way too long (and speed for my program is quite important). I also tried "cheating" (find/rowstatefilter = none), but it seems applying the rowStateFilter lasts about as long as applying the filter. Does anyone have any ideas?
Thx

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