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In the controls constructor add the following line
SetStyle(ControlStyles::UserPaint, true);
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Hi,
Is there a way to attach a Tag value to each item in a ComboBox (like the Tag property of ListViewItem)?? I need to know the ID of the record in the database while displaying the readable name.
Thanks in advance,
-- LuisR
──────────────
Luis Alonso Ramos
Chihuahua, Mexico
www.luisalonsoramos.com
"Do not worry about your difficulties in mathematics, I assure you that mine are greater." -- Albert Einstein
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The value displayed in a combobox (by default) is obtained by calling ToString() on the item in question.
So the simple answer is to write a class that has your two values and make the ToString() method return the string value.
The better answer is to make the ID and readable name values into properties. Then you can set the DisplayMember and ValueMember properties on the ComboBox to the names of the properties in your class and retreive the value by examining the SelectedValue property to tell which value is selected.
HTH,
James
"Java is free - and worth every penny." - Christian Graus
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About the better way, are the DisplayMemeber and ValueMember and all those properties of the ComboBox itself, or of each item??
So it would be something like cmb.Items.Add(1, "Item #1")??
-- LuisR
──────────────
Luis Alonso Ramos
Chihuahua, Mexico
www.luisalonsoramos.com
"Do not worry about your difficulties in mathematics, I assure you that mine are greater." -- Albert Einstein
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How do I filter out non-standard foreign language fonts like gautami, latha, mangal, shruti and raavi? These fonts are a puzzle. They don't render at all [not even in Word XP]. They show black boxes when you dbl clk them. Rama says they are Indian language fonts. I say they suck!!! Cause they won't render and they return wrong values when you MeasureItem them. Anyone's got any ideas on filtering theme out.
Nish
p.s. Right now I am gonna have to hardcode these 5 fonts into a filter list I think 
Author of the romantic comedy
Summer Love and Some more Cricket [New Win]
Review by Shog9
Click here for review[NW]
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Can someone point me to the differences between OT and TT? I just noticed OT in Windows XP and for all intents and purposes it seems the same as TT. What's the difference?
-Domenic Denicola- [CPUA 0x1337]
MadHamster Creations
"I was born human. But this was an accident of fate - a condition merely of time and place. I believe it's something we have the power to change..."
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Background:
C# Windows Forms project. I've make a control based on the DataGrid for logging the "progress" of an applications.
I'm looking for a way to have the DataGrid keep up with new items beeing added, by forcing a scoll to the last item after each addition.
Any suggestions would be appreciated.
TIA.
Mike Stanbrook
mstanbrook@yahoo.com
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Use the CurrentCell property to change which cell is visible (ie, set it to the first column in the last row).
It looks really stupid this way; but here is the code to do that
myGrid.CurrentCell = new DataGridCell(rowIndex, 1);
[rant]
Who ever thought it would make sense to assign a cell to the current cell property must've been smoking something at the time. To me this says replace the contents of the current cell with this new cell. Its not until you look at the documentation for DataGridCell that you realize it is used only to identify a cell by location and not to hold the actual contents of it. 
[/rant]
James
"Java is free - and worth every penny." - Christian Graus
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Thanks.
I do agree that it doesn't look "elegant".
I also agree it would seem there is "something" missing, but could just be the 'ol VB6er in me..
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I have a control that overrides WndProc. I handle WM_NCCALCSIZE and in the case where LParam is true I need to store a pointer to a value in the Result field of the Message structure. I do so as follows:
msg.Result = Marshal.AllocHGlobal(4)
Marshal.WriteInt32(msg.Result, WVR_REDRAW)
I never call Marshal.FreeHGlobal since the Result is used outside the scope of WndProc.
Will this code cause a memory leak? If so, is there any way to do this without a memory leak?
Thanks
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msg.Result = WVR_REDRAW;
will be just fine
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That won't compile for me since Result is an IntPtr and WVR_REDRAW is just an Integer...
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Ok,
msg.Result = new IntPtr(WVR_REDRAW);
As far as I'm concerned you are a lower form of life than B*** S***** and M***** M******** combined. Colin Davies on some guy called R*** G****
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That doesn't work either.. That creates a pointer to memory location WVR_REDRAW, the value at that location is not controlled by me.. I need to set Result to an IntPtr that points to a location containing the value WVR_REDRAW... The only way that I know of to do this is with the AllocHGlobal and WriteInt32 calls...
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Kastro wrote:
That doesn't work either..
No my code was right IntPtr is a value type so you will not have any problems.
You don't need AllocHGlobal
As far as I'm concerned you are a lower form of life than B*** S***** and M***** M******** combined. Colin Davies on some guy called R*** G****
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From the .NET help docs:
public IntPtr(
int value
);
value - A pointer or handle contained in a 32-bit signed integer."
IntPtr is a value type, but the value that it stores is an address.
My original code works (presumably leaking memory though). When I switch to using new IntPtr(WVR_REDRAW) it doesn't work...
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IntPtr is a value type of size same as the default pointer size for the platform. It can be used for numbers or pointers. All it is is that it size varies the number stored in it can be anything.
In window messages LParam, and WParam are 32 bit ints or 64 bit ints depending on the platform. In window messages LParam and WParam mean different things depending on the context. Same thing about LResult it can be used to return integers or pointers. In case of WM_NCCALCSIZE windows expect an integer to be returned so if return as new IntPtr(WVR_REDRAW) it is ok.
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Ok, I figured out what's going on... You are right about just using new IntPtr(WVR_REDRAW).. I used Spy++ to see what result was being returned for the WM_NCCALCSIZE message...
For my code I was getting WVR_ALIGNBOTTOM | WVR_REDRAW | 0019F008
From what you suggested I get WVR_REDRAW...
What you suggested wasn't working (as far as the control went) because of other reasons...
Also is the wording of the help file incorrect then? That's what led me to believe what I did.
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Kastro wrote:
Also is the wording of the help file incorrect then?
Not entirely, IntPtr is used to represent an integer value that varies in size depending on the platform. A specific use of such an integer is a pointer. There isn't anything special about a pointer, except that its value refers to a location in memory.
James
"Java is free - and worth every penny." - Christian Graus
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Hi
I have a problem with running more than 2 async WebRequest's when launched. To explain better. Only 2 at a time responds, while the others wait for a "slot" to open. Then once one "slot" is open, the next async WebRequest will continue.
I am invoking all the requests from a foreach loop in the main program thread. I was thinking there is maybe a 2 operation limit, but can find no such mention.
IAsyncResult res = ds.WebRequest.BeginGetResponse( new AsyncCallback( this.ResponseCallback) , ds);
But ResponseCallback only get called when a slot opens up.
Any help will be accepted.
MYrc : A .NET IRC client with C# Plugin Capabilities. See
http://sourceforge.net/projects/myrc for more info. 
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