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The delete key (by default) works for a row and not for a cell.
Create a separate KeyDown / KeyPress capture method to handle the key press for delete key.
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Hi;
I want to convert a list to an array but just part of it,because my array is smaller than the list.
int[] copyselection = (int[])selec.ToArray(typeof(int[]));
I want to limit the array elements for example ,I want to copy just 100 elements of it;
Thank you all in advance
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OK, then there are two methods of doing this.
The first uses a smaller memory footprint as you would use a for loop and copy the data you want from each element in the List to the Array.
The larger memory footprint version is a one-line method, but you'll end up converting your entire List to an array, then Array.Copy[^] out the section you want.
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you're too generous.
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Thank you
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Might I suggest a for loop:
int Limit = selec.Count > 100 ? 100 : selec.Count;
for ( int LoopCount = 0; LoopCount < Limit; LoopCount++ )
copyselection[LoopCount] = selec[LoopCount];
The difficult we do right away...
...the impossible takes slightly longer.
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you're really too generous.
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I think the Take extension method of IEnumerable can be used for this purpose as shown below:
List<int> data = new List<int>(){1,2,3,4,5,6,7,8,9,10};
int[] array = data.Take(5).ToArray();
The Take method takes specified number of elements or the total elements of the list if the total is less than the specified number.
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Best answer!
The difficult we do right away...
...the impossible takes slightly longer.
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so far, yes.
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list items have a index, you can use for for selecting 100 item, or if you looking at some value in items use list.Where(p => p.StartsWith("s")) in a Foreach loop.some thing like this:
List<string> lsi = new List<string>();
lsi.Add("sara");
lsi.Add("soo");
lsi.Add("kabab");
foreach (var item in lsi.Where(p => p.StartsWith("s")))
{
Response.Write(item);
}
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With all the upvoted answers so far, you haven't gotten the proper solution yet IMO; I recommend
int[] mySmallArray=myList.GetRange(startIndex, count).ToArray();
which avoids both a big intermediate array and any visible looping, and doesn't require .NET version 3.5+
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You sir, are too modest.
Luc Pattyn wrote: and any visible looping
Way to cover your ass!
Curiously, I'll have to dig into the GetRange code now...
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I'm sure you'll find a loop inside, as well as inside List.ToArray() and Array.Copy() .
And even if List.GetRange() were returning an IEnumerable rather than a list, there still would be a loop doing the hard work.
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I've just seen this and happened to have reflector open so I've had a look!
GetRange uses Array.Copy to copy to a new list:
List<T> list = new List<T>(count);
Array.Copy(this._items, index, list._items, 0, count);
list._size = count;
return list;
as is ToArray but to an array instead:
T[] destinationArray = new T[this._size];
Array.Copy(this._items, 0, destinationArray, 0, this._size);
return destinationArray;
Now quite what Array.Copy is doing I'm not 100% sure as it's an extern function, so perhaps it's using unmanaged code to block copy?
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IMO you're right!
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Use ArrayList.
example:
ArrayList AryObj= new ArrayList();
for (int i=0; i < selec.Item.Count; i++)
{
AryObj.Add(selec.Item[i].Text);
}
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That is bad.
ArrayList is the only list that existed back in .NET 1.0 and 1.1; since 2.0 we have generic lists such as List<int> and there is no real use for ArrayList anymore, it is just an equivalent to List<object> and therefore it is superfluous as a type.
Furthermore it does not contribute at all to the solution of the OP's problem.
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Thanks
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Dear All,
Would you please advise if there's certain problems in EMGU Library or Accord Library???
I made a program to recognize Sign language using image processing , feature extraction & HMM but I'm not achieving the needed accuracy.
the number of correct recognitions is tooooo much small and I can't apply my project with such errors.
I highly appreciate your help & cooperation.
All the best...
Rima
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Don't just post this everywhere - it duplicates work and can annoy people.
Either post it in QA or post it in the forums - but not both!
Ideological Purity is no substitute for being able to stick your thumb down a pipe to stop the water
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OK & Sorry for this mistake
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