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Hello,
I override the Paint method for datagrid, and I am using this peice of code (numberFormatInfo object is defined):
if (rowNum < 4) {<br />
this.Format = "n";<br />
this.FormatInfo = numberFormatInfo;<br />
} else {<br />
this.Format = "c";<br />
this.FormatInfo = numberFormatInfo;<br />
}
But when the grid loads it constantly flickers, and other controls on the form do not load unless I move the form. However, if this portion ov the method is removed everything is fine. Anybody has any ideas, why this happening?
Thank you.
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Without seeing the reset of your painting code, it's impossible to tell you what's going on.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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protected override void Paint(System.Drawing.Graphics g, System.Drawing.Rectangle bounds, CurrencyManager source, int rowNum, System.Drawing.Brush backBrush, System.Drawing.Brush foreBrush, bool alignToRight) <br />
{ <br />
DataRowView view = (DataRowView) source.Current;<br />
System.Drawing.Color myColour = Color.White;<br />
numberFormatInfo = new NumberFormatInfo();<br />
numberFormatInfo.CurrencySymbol = "$";<br />
numberFormatInfo.NumberDecimalDigits = 0;<br />
numberFormatInfo.CurrencyDecimalDigits = 0;<br />
numberFormatInfo.CurrencyNegativePattern = 1;<br />
<br />
<br />
<br />
string[] str = view.DataView.Table.Rows[rowNum]["IndentLevel"].ToString().Split('~');<br />
<br />
<br />
<br />
<br />
if (str.Length == 1) {<br />
myColour = Color.Coral;<br />
} else if (str.Length == 2) {<br />
if (str[1] == "1" || str[1] == "4") {<br />
myColour = Color.PaleGoldenrod;<br />
} else if (str[1] == "7") {<br />
myColour = Color.Lavender;<br />
} else {<br />
myColour = Color.Wheat;<br />
}<br />
} else if (str.Length == 3) {<br />
myColour = Color.SeaShell;<br />
} else {<br />
myColour = Color.Thistle;<br />
}<br />
<br />
try{ <br />
backBrush = new SolidBrush(myColour); <br />
} <br />
catch(Exception) {} <br />
finally {<br />
base.Paint(g, bounds, source, rowNum, backBrush, foreBrush, alignToRight); <br />
} <br />
}
So, the comented out portion couses the datagrid to flicker.
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At start I have a picturebox generated by Runtime, image is already initialized.
The name of the pbox is "picBoxDoubles_object1".
Now I have an ArrayList and want add this picturebox.
public void MovePicToDest(PicBoxDoubles pbd)<br />
{ <br />
ArrayList arr = new ArrayList(); <br />
arr.Add(pbd);<br />
<br />
<br />
arr.Clear(); <-----------<br />
}
If arr.Clear is executed, the picturebox disappears from the desktop. Is "pbd" not a parameter ByValue?
So it seems, that the real object was added not a copy. How can I solve this one?
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Change the method to accept PictureBox type.
public void MovePicDest(PictureBox pb)
{
ArrayList arr = new ArrayList();
arr.Add(pb);
//Now if ArrayList.Clear is called; it should clear the arraylist and not remove your object.
arr.Clear();
}
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PicBoxDoubles has Inheritance to PictureBox, so if I am change the parameter it still doesn't work.
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What is the reason behind adding the picturebox to the ArrayList?
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The application has two big Pictureboxes A and B.
"A" has many child objects(PictureBoxes) and if you click on one of these, they are copied to "B". Actually they are transfered during this problem. It should stay in A and make a copy to B.
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I made a new object of this class and copied each attribute. This works, but the inherited Picturebox has more than 80 new attributes. Not a real good solution.
I need to know how to copy objects.
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You could implement the IClonable interface in your PictureBox class. This interface is used to create a copy of an object, but you would still have to write the attribute copying code in there.
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How can I pass to Interlocked.Exchange(...) an object of my own type?
In the code below both DoNothing and Interlocked.Exchange generate a compiler error.
using System;
using System.Threading;
class MyObject
{
}
class ReferenceTry
{
[STAThread]
static void Main(string[] args)
{
MyObject o = new MyObject();
MyObject oo;
DoNothing(ref o);
oo = (MyObject) Interlocked.Exchange(ref o, null);
// do something with oo
}
static void DoNothing(ref object o)
{
}
}
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First, you never said what the error was.
Second, Interlocked.Exchange returns a value and takes two parameters, neither of which can be null. You're code isn't passing an Object into the function either.
someType2 = (SomeType)Interlocked.Exchange(ref someType1, (object)someType2);
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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So, the reference parameters do not work with subclasses?
Then Interlocked.Exchange(ref object, object) can't be used for anything?
Because if I make a variable
object o2 = (object) o;
and call
oo = (MyObject) Interlocked.Exchange(ref o2, null);
o = (MyObject) o2;
then I lost the atomicity (another thread can set o between Interlocked.Exchange and o = (MyObject) o2; ).
And if I declare o as object I must cast it every time I wish to use MyObject's members.
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The first parameter can be passed as any type of object, but the second parameter MUST be passed as Object.
Interlocked.Exchange( someType1, CType(someType2, Object))
If you can convert null to an Object, you're in business.
Interlocked.Exchange Method (Object, Object)[^] docs on MSDN.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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I have two images that I am ANDing into 1 image. I have also tried XOR'ing the images into 1.
The resulting image has both image 1 and 2 together, image 2 is kinda off colored, sometimes dark, and image 1 is fine.
my question is, how can i get my resulting image cleaner to where it can be presentable? Cant I, after anding them into 1 image, put the areas that are the same in all black, and the newer area's to be normal color? If so, i can then run code to make the black area's transparent so that it will fit over the original image cleaner (meaning no dark shading or off colors).
I wish I could post a screen shot to what im speaking of. The example I am using is found at http://www.codersource.net/csharp_image_processing_xor.aspx[^]
Any help would be appreciated.
Steve Welborn
Software Architect
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Swelborn wrote:
If so, i can then run code to make the black area's transparent so that it will fit over the original image cleaner (meaning no dark shading or off colors).
Sure - just add a check in the code you're using that if one pixel is black, you just copy the other one. I don't think this will work too well tho, not all black areas are background, and not all background areas are black. One has to wonder just how clear you expect each image to be if you're merging them, and what this is being used for ?
Christian Graus - Microsoft MVP - C++
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I've searched in the forums, in the articles and even in the MSDN, but I'm not able to understand what the filealign option for the c# compiler does.
All that I know is that reduces the filesize a bit.
Other functions?
I wonder if Microsoft has included another useless option.
Tozzi is right: Gaia is getting rid of us.
Do you feel the way you hate or do you hate the way you feel?
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If your project was going to be transferred to a Pocket device, you'd probably want the .EXE sections packed to 512 byte boundries to save space.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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So it's only a filesize matter. At least now I know it.
Tozzi is right: Gaia is getting rid of us.
Do you feel the way you hate or do you hate the way you feel?
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Class B includes a method "public void Save()".
Class A includes one field which type is B.
In some other class I am using reflection to gather information about class A and B:
<code>
{
Type ClassType = typeof(refl.A);
FieldInfo[] fields = ClassType.GetFields();
foreach(FieldInfo f in fields)
{
Type t = f.FieldType;
MemberInfo[] members = t.GetMembers();
foreach (MemberInfo m in members)
{
if (m.Name == "Save")
{
<big>?????
</big>
}
}
}
}
</code>
When I find a function Save, i would like to call it. This isn`t a static method so I need to call it over some object. How to make it inside reflection?
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You could do something like this.
<code>
public class B
{
public void Show()
{
System.Windows.Forms.MessageBox.Show( "B.Show called!" );
}
}
public class A
{
private B mB;
public B MemberB
{
get
{
return ( this.mB );
}
set
{
this.mB = value;
}
}
public A()
{
this.mB = new B();
}
}
public Class Tester
{
private A mA;
public void Do()
{
object lB;
lB = this.mA.GetType().GetProperty("MemberB").GetValue(this.mA, null );
lB.GetType().InvokeMember("Show",System.Reflection.BindingFlags.InvokeMethod, null, lB, new object[] { } );
}
}
</code>
I hope this helps.
<i>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 </i>
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Thank you both, it seems to be working 
One more question - suppose that properties does not exsist.
public class A
{
int i;
void show() { ... }
}
public class B
{
A a;
}
How to (using reflection on class B) call a non-static function on member a? (like:
B b = new b();
b.a.show();
)
thank you for help
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Hello,
In my datagrid, the TextColumn are set to:
aTextColumn.Alignment = HorizontalAlignment.Center;<br />
aTextColumn.Width = 140;<br />
aTextColumn.Format = "c";<br />
aTextColumn.FormatInfo = numberFormatInfo;
However, the first 5 rows, are appended and do not display dollar values, but they still display the dollar sign in front of all the values. Is there a way (like overriding the Paint method) of removing the dollar sign for the first 5 rows?
Thank you.
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