Re: adding to a list - C# Discussion Boards

how do I detect a mouse down in a DataGridView that is not over a cell?

Dan Neely2-Jun-09 2:54

2-Jun-09 2:54

basically I want to clear the selection and keep a context menu from coming up if the user right clicks in empty space beneath the last row. The MouseDown event fires before the CellMouseDown event so I can't have the latter set a flag to control the former. The former gives a mouse coordinate but I don't see a way to check if it's on a row or not.

It is a truth universally acknowledged that a zombie in possession of brains must be in want of more brains.
-- Pride and Prejudice and Zombies

Re: how do I detect a mouse down in a DataGridView that is not over a cell?

Jimmanuel2-Jun-09 3:00

Jimmanuel

2-Jun-09 3:00

As to this comment:

dan neely wrote:
I don't see a way to check if it's on a row or not

there's the HitTest[^] method. You may find the example code in the docs useful. Smile | :)

Badger | [badger,badger,badger,badger...]

Re: how do I detect a mouse down in a DataGridView that is not over a cell?

Dan Neely2-Jun-09 4:04

Dan Neely

2-Jun-09 4:04

Thanks. The only problem with kitchen sink classes is that intelligence isn't that helpful when it returns 10 zillion items.

It is a truth universally acknowledged that a zombie in possession of brains must be in want of more brains.
-- Pride and Prejudice and Zombies

adding to a list

maurimauri292-Jun-09 2:47

maurimauri29

2-Jun-09 2:47

Hi all,
I am quite new to C# and I bumped into this issue and I cannot understand why it is happening. I have a list of objects of class1. class1 has, as a member variable a list of objects of class2, and class2 has as a member variable a list of objiects of class3. In my code I have to add some objects to the list of objects of class3 for the last element of the list of objects of class2 for one of the elements of the list of objects of class1. It seems it should be straight forward but i found a strange behaviour and maybe you clever people can help me make some sense out of it.
I'll explain with an example: if the list of objects of class1 has 2 elements (ListClass1[0] and ListClass2[1]) and I do

ListClass1[0].ListClass2[ListClass1[0].ListClass2.Length-1].ListClass3.Add(ObjClass3)

at the end of this I find that the ObjClass3 has been added to ListClass1[1].ListClass2[ListClass1[1].ListClass2.Length-1].ListClass3

Why is that happening?
Is there any way around this?
Cheers
Mauri

Re: adding to a list

Le centriste2-Jun-09 2:50

Le centriste

2-Jun-09 2:50

If I were you, I would rewrite that piece of code to make it more readable.

Also, without the code for your classes, it is very difficult to figure out what is happening.

Please format your code correctly using the <pre> and <code> tags.

Re: adding to a list

musefan2-Jun-09 2:53

musefan

2-Jun-09 2:53

Hmmmm, that is a strange one...

my first though is that the objects stored in ListClass1 are refrences to the same object so changing one would alter them all.

Can you confirm this is not the case?

Life goes very fast. Tomorrow, today is already yesterday.

Re: adding to a list

0x3c02-Jun-09 2:56

0x3c0

2-Jun-09 2:56

Perhaps ListClass[1] and ListClass[2] are pointing to the same object? If they're reference types, then assigning them to be equal to one another would have that effect, I think

Between the idea
And the reality
Between the motion
And the act
Falls the Shadow

Re: adding to a list

maurimauri292-Jun-09 3:30

maurimauri29

2-Jun-09 3:30

now i feel daft. yes, that was the problem. Thanks guys, much appreciated.
Mauri

VERY URGENT!!!!!!

musefan2-Jun-09 2:47

musefan

2-Jun-09 2:47

I URGENTLY NEED A POO, CAN SOMEBODY PLEASE DO IT FOR ME?!?!

Life goes very fast. Tomorrow, today is already yesterday.