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P.S. I tried casting the TabControl to Control, and setting the BackColor on the cast. No luck.
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Hi
How are you?
I need to hide certain properites of an object when i change a property value e.g.
enum ObjType
{TypeA,TypeB}
public ObjType Type
{
get {...}
Set {...}
}
As i change value of Type Property of an Object i want to hide some browsable properties or show some browsable(false) properties
C#
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Sorry
i need to dynamically hide and show properties in the property grid at run time
like using attribute browsable false and true
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I needed to do something similar. You'll need to implement the ICustomTypeDescriptor interface (here's an article that shows how).
In ICustomTypeDescriptor's GetProperties() method you can set which properties will show up in the PropertyGrid (see my articles demo source for an example).
So using your example, you could do something like:
TypeACustomTypeDescriptor typeATypeDescriptor = new TypeACustomTypeDescriptor();<br />
TypeBCustomTypeDescriptor typeBTypeDescriptor = new TypeBCustomTypeDescriptor();<br />
<br />
public ObjType Type<br />
{<br />
get {...}<br />
set <br />
{<br />
if (value == ObjType.TypeA)<br />
{<br />
PropertyGrid.SelectedObject = typeATypeDescriptor;<br />
}<br />
else<br />
{<br />
PropertyGrid.SelectedObject = typeBTypeDescriptor;<br />
}<br />
}<br />
}
"I think I speak on behalf of everyone here when I say huh?" - Buffy
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Hi
Sir How are you ?
Thank alot it works as i needed
thank you again
best wishes
Ali
VC++,COM ,C#
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Hi,
i have created a stored procedure which returns number of un-read memo(s).....
stored procedure's code :
----------------------------
CREATE PROCEDURE spNumOfUnReadMemos
@EmpTo char(6), @NumOfUnReadMemos int OUTPUT
AS
SELECT COUNT(EmpTo) FROM tblMemoManagement WHERE
EmpTo=@EmpTo AND ReadYesNo='NO'
RETURN;
GO
---------------------------------------
Then i have a C# Class which access this stored procedure as
public int getNumUnReadMemos() {
int retVal=0;
try {
//create the sql
sql = "spNumOfUnReadMemos";
//open the connection
gICVars.scInCtrl.Open();
//create the command
cmdMemo = new SqlCommand(sql,gICVars.scInCtrl);
cmdMemo.CommandType=CommandType.StoredProcedure;
//create the parameters
cmdMemo.Parameters.Add("@EmpTo", SqlDbType.Char,6);
cmdMemo.Parameters[0].Value=this.getToEmp();
cmdMemo.Parameters.Add("@NumOfUnReadMemos", SqlDbType.Int,4);
cmdMemo.Parameters[1].Direction=ParameterDirection.Output;
//execute the non-query
cmdMemo.ExecuteNonQuery();
//retrieve the value of NumOfUnReadMemos
Console.WriteLine(cmdMemo.Parameters[1].Value);
//retVal = int.Parse(cmdMemo.Parameters[1].Value.ToString());
Console.WriteLine(cmdMemo.Parameters[1].Value);
//clean up code
cmdMemo.Dispose();
sql=null;
gICVars.scInCtrl.Close();
return retVal;
}
catch(Exception ex) { Console.WriteLine(ex.ToString()); return -1; }
}
----------------------------------------------
whenever i tried to execute this code .. i got following error....
System.FormatException: Input string was not in a correct format.
at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info)
at System.Int32.Parse(String s, NumberStyles style, IFormatProvider provider)
at System.Int32.Parse(String s)
at InventoryControl.cMemo.getNumUnReadMemos() in d:\shirtuniverse\inventorycontrol\cmemo.cs:line 380
------------------------
any idea(s)... y i am getting this error
THANX in advance
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ronin1770 wrote:
CREATE PROCEDURE spNumOfUnReadMemos
@EmpTo char(6), @NumOfUnReadMemos int OUTPUT
AS
SELECT COUNT(EmpTo) FROM tblMemoManagement WHERE
EmpTo=@EmpTo AND ReadYesNo='NO'
RETURN;
GO
No where in this stored procedure is the @NumOfUnReadMemos assigned so the output parameter will not contain anything.
You have two choices.
1. Assign the value to the output parameter
2. Access the Stored Procedure in .NET using ExecuteScalar()
ronin1770 wrote:
//retVal = int.Parse(cmdMemo.Parameters[1].Value.ToString());
I'm guessing that this is where the parser error occurred. The reason is that the value, when converted to a string, is not a number, so the parser throws an exception. It isn't a number because the stored procedure never assigned anything to the output parameter.
Do you want to know more?
WDevs.com - Member's Software Directories, Blogs, FTP, Mail and Forums
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Hi,
I can't seem to hide my MainForm at my application startup. I just want the notifyicon in the systray to be visible. mainform.Hide() dosn't work. It displays the mainform anyway.
Does somebody now a way to do this?
Andreas Färnstrand
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This could work for you:
- set ShowInTaskbar to false
- set WindowState to FormWindowState.Minimized
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And/or set Opacity to 0.
These all seem like kludges, though. It seems like there should be a way to tweak the create params.
Matt Gerrans
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Setting Opacity to 0 is 
My two line suggestion should be the easiest possible way of doing it.
You can override the CreateParams property like this:
protected override CreateParams CreateParams
{
get
{
CreateParams cp = base.CreateParams;
return cp;
}
}
I never actually overriden this property before. You can give it a try.
This posting is provided "AS IS" with no warranties, and confers no rights.
Alex Korchemniy
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That doesn't quite work by itself (I replaced "// change" with "cp.Style = cp.Style & ~1;"); you still see the window flash for a fraction of a second on startup.
Matt Gerrans
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Would setting the Location property in the Designer to have a Y value of, say, 3000, to put it off the display entirely, keep the flash from being seen?
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I think that's just another kludge, so it would be just as well to stick with the minimized+not-in-taskbar.
Most of the time the object oriented wrapping of the underlying Windows API mechanics is a benefit, but there are few rare cases when some things are a little more difficult. Hiding the main window on startup was also not obvious with MFC and Borland C++ Builder. If you ever wrote Windows apps "in the raw" it was pretty easy to control such things, but all the frameworks hide those details from you. Nevertheless, the productivity gain makes it well worth the price of dealing with the occassional quirk like this. After developing a few graphical apps in C#, there isn't much draw to going back to using the API in C.
Matt Gerrans
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I have a RichTextBox in an app
When the app starts it does
richTextBox.LoadFile( somefilename );
and when the app quits it does
richTextBox.SaveFile( somefilename );
which for formatted text works great (the contents persists between sessions, which is what I want)
However, if I paste in an object (say a bitmap from Paint) then it saves happily (I can load the resultant rtf file into word and see the image) but when the app reloads it, the image is gone
I've tried
richTextBox.LoadFile( somefilename , RichTextBoxStreamType.RichText );
but it doesn't seem to make any difference
--
Help me! I'm turning into a grapefruit!
Phoenix Paint - back from DPaint's ashes!
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We've seen this problem. I believe if you copy an image from mspaint, the RTF is saved differently than if you copied an image out of Word or a web browser. Give it a try and see for yourself.
Basically, when you're copying image data from paint, the RTF emitted is some simple codes basically telling it to embed the image data on the clipboard. It does NOT embed the image as a WMF as it should. But when copying an image out of Word or many other apps, the data is written as a WMF into the RTF, thereby keeping it persistent between sessions.
Any remotely useful information on my blog will be removed immediately. There are 10 kinds of people in the world. Those who have heard of the ubiquitous, overused, worn-out-like-an-old-shoe binary "joke" and those who haven't.
Judah Himango
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Hi All
I have a windows service that runs code based on a timer. However, the tick event on the timer dosen't fire. I'm writing to the event log all the way through, and the timer is definetly wired, but the tick event never fires.
To test this out properly, I started a new project with nothing but a timer in it, and a write to the event log when it ticks. Same result. On an Interval of 10 seconds we go 2 mins and tick event has still not fired.
Can anyone tell me why, or a way to get around this?
Thanks in advance
Doug Wilson
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Nevermind - solved my own problem 
For those who come across the same problem - I was using the wrong timer. A windows forms timer ticks, a system timer elapses.
Using a system timer works from within a service, a windows forms timer doesn't.
Doug Wilson
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Of course it doesn't, cause as MSDN states: "This timer is optimized for use in Windows Forms applications and must be used in a window." or "It requires that the user code have a UI message pump available".
So always read the documentation thoroughly, cause almost every information needed is written down there
www.troschuetz.de
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You're using System.Windows.Forms.Timer. It has no use in Windows Service.
Using System.Timers.Timer class instead.
You must also change Timer_Tick eventhandler by Timer_Elapsed eventhandler
That's so simple!
Good luck!
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I have started doing some research for a relational database modeller. For this I'm gonna need the application to be able to do some drawing. I have been testing some simple things with GDI+ but I started thinking about the possibility of using managed DirectX.
What do you think, would I get a performance gain by using DirectX compared to using regular GDI+? Or maybe DirectX would put a too high system requirement for just using the application.
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G.Ringbom wrote:
What do you think, would I get a performance gain by using DirectX compared to using regular GDI+?
Yes, but developing the UI will be much harder. DirectX is really targeted at easing game development, not easing UI development.
For a DB modelling tool, I can't see why you would need high frame rates. GDI+ is more than capable of drawing complex screens at decent speed for an editor.
As an example, I created recently a graphical editor for a rule engine, all done in C# (with a few P/Invoke calls) and the speed is very good on an old test machine (AMD 650MHz - 256MB RAM - PCI Riva TNT2 card) that we have here. Even on the biggest files, it's very usable.
Yes, even I am blogging now!
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Daniel is right. Even programs like Visio use GDI
This posting is provided "AS IS" with no warranties, and confers no rights.
Alex Korchemniy
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