C# datagridview display Question - C# Discussion Boards

C# datagridview display Question

26-Jul-09 12:42

Ah, there you are, I figured you'd show up eventually. Big Grin | :-D

See here[^].

However, if you want several unique sequences of the same values, you may need to go a step further.

Add:

As you're generating a sequence, make a base-40 string of it. Have a HashSet<string> to hold the sequences you've already generated. If the sequence is a duplicate, try again; if not, add it to the HashSet and return it.

You can generate a base-40 digit with "0123456789ABCDEFGHIJKLMNOPQRSTUVQXYZabcd" [ i ] and append it to a StringBuilder.

modified on Sunday, July 26, 2009 8:37 PM

Unicode

hadad26-Jul-09 4:03

hadad

26-Jul-09 4:03

Hello,
I want to get the unicode of some chars to send them to a cellphone
EX:
0628 represnt the char 'ب' in Arabic iwant to get this 0628 from this letter.

thanks

Dad

Re: Unicode

Manas Bhardwaj26-Jul-09 4:16

Manas Bhardwaj

26-Jul-09 4:16

For each character in the string this displays:

The character
It's unicode character code in hex
It's unicode character code number

string text = "0 a+…"";
   foreach (char c in text)
   {
      Console.WriteLine("{0} U+{1:x4} {2}", c, (int)c, (int)c);
   }

Manas Bhardwaj
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Re: Unicode

harold aptroot26-Jul-09 4:48

harold aptroot

26-Jul-09 4:48

Chars already are in unicode

spankyleo12326-Jul-09 3:26

spankyleo123

26-Jul-09 3:26

My Question,

I have designed FORM1 with a datagridview dgvForm1 and am populating data into it using LINQ queries. The data is populating fine into the dgvForm1.

I have a checkbox column in the dgvForm1 to select the checked rows.

I have a button in FORM1 called DISPLAY.

I have FORM2 with datagridview dgvForm2.

All I want to do is ...allow the user to select the required rows from dgvForm1 using checkboxs. After selecting, the user clicks on the DISPLAY which will show FORM2 . I want to display the selected rows from dgvForm1 in the datagridview(dgvForm2) of FORM2.

Am using C# with VS 2008 , this my code for reading the checked value of rows,,,, I have defined a constructor in Form2 to take in string values. Then in form2 initialization am assigning the string value to datagridview2 in form 2.. Am not sure if its correct to do so ..... but am not getting the required result.i.e my datagrid2 is not getting populate with the checked rows from datagrid1. please suggest solutions,,,thanks

string<br />
<br />
data = string.Empty;<br />
//data = this<br />
foreach (DataGridViewRow row in dataGridView1.Rows<br />
{<br />
if (row.Cells[SelectColumnIndex].Value != null &&<br />
Convert.ToBoolean(row.Cells[SelectColumnIndex].Value) == true)<br />
{<br />
foreach (DataGridViewCell cell in row.Cells)<br />
{<br />
if (cell.OwningColumn.Index != SelectColumnIndex)<br />
{<br />
data += (cell.Value + ","); <br />
}<br />
}<br />
data += "\n";<br />
}<br />
}<br />
Form2 fm = new Form2(data);<br />
fm.Show();<br />
<br />
}<br />
<br />
<br />
public Form2(String data) <br />
<br />
{<br />
<br />
InitializeComponent();<br />
<br />
this.dgv1Fm2.DataSource = data; <br />
<br />
 <br />
<br />
 <br />
<br />
}<br />
<br />

Re: C# datagridview display Question

Henry Minute26-Jul-09 3:45

Henry Minute

26-Jul-09 3:45

I would suggest an alternative strategy.

Instead of a string for your data member use a List<>.
Then for each selected row add the primary index value to the List<>.
Pass the data to Form2, in the constructor, as you do now and then load data into the dgv using a SELECT statement, passing in the items from the List<> as parameters for a WHERE clause.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Re: C# datagridview display Question

spankyleo12326-Jul-09 4:29

spankyleo123

26-Jul-09 4:29

Is there any easier way....to display selected data from form1 dgv using checkbox...and diaplay in dgv of form2

Re: C# datagridview display Question

Henry Minute26-Jul-09 4:46

Henry Minute

26-Jul-09 4:46

spankyleo123 wrote:
Is there any easier way

Depends on what you call easy! Big Grin | :-D

It also depends on what you want to do with the data in Form2. If it is read only then you could create a class (I'll refer to it as SelectedData) that has fields for each of the columns of interest from your data, give it a Constructor that takes a DataGridViewRow and load the fields from the dgvRow in the Constructor.

You could then go through your dgv and for each selected row create an instance of SelectedData with the DataGridViewRow and add it to a List<selecteddata>.

Pass the filled List to Form2 and simply set dgvForm2.DataSource to the List<>.

If you need to edit the data in Form2, my previous suggestion, or a variation of it, would be preferable.

Taking screenshots from DirectX Games

SimpleData26-Jul-09 2:55

SimpleData

26-Jul-09 2:55

Hi I am trying to take screenshots from DirectX Games and I successfully take screenshots most of the time. But sometimes my screenshots come out completely black.

Here is the code I am using to take screenshot:</b>

int screenWidth = Screen.GetBounds(new Point(0, 0)).Width;
int screenHeight = Screen.GetBounds(new Point(0, 0)).Height;
Bitmap bmpScreenShot = new Bitmap(screenWidth, screenHeight);
Graphics gfx = Graphics.FromImage((Image)bmpScreenShot);
gfx.CopyFromScreen(0, 0, 0, 0, new Size(screenWidth, screenHeight));
bmpScreenShot.Save("test.jpg", ImageFormat.Jpeg);

A global solution to take screenshots would be great (for desktop - for DirectX and OpenGL games).

Thank you.

Insert Obejct to sorted list

bonzaiholding26-Jul-09 2:44

Re: Insert Obejct to sorted list [modified]

26-Jul-09 2:44

How can i insert to list/array an object to the right place by some comparison function and in the end of the process to get back the best 100 object?

for example if i have this code:

<br />
 class Example : IComparable<br />
    {<br />
        //Var's and Prop's of class<br />
        public double num1;<br />
        public double num2;<br />
        public double GetIt<br />
        {<br />
            get<br />
            {<br />
                return num1 * num2;<br />
            }<br />
        }<br />
<br />
        //Some function the return value based on var's of class<br />
        public double SomeValue()<br />
        {<br />
            double result = this.num1 * this.num2 - this.num1 / (this.num2 + 1);<br />
            return result;<br />
        }<br />
<br />
        //Compare function between 2 Example's<br />
        #region IComparable Members<br />
<br />
        public int CompareTo(object obj)<br />
        {<br />
            Example e1 = (Example)obj;<br />
            int res = (this.SomeValue() - e1.SomeValue()) > 0 ? 1 : -1;<br />
            return res;<br />
        }<br />
<br />
<br />
        #endregion<br />
    }<br />
<br />
    //Class that want to find the best 100 Examples<br />
    class UsingExample<br />
    {<br />
        public List<Example> m_List;<br />
<br />
        public UsingExample()<br />
        {<br />
            m_List = new List<Example>();<br />
            for (int num1 = 1; num1 <= 100; num1++)<br />
                for (int num2 = 1; num2 <= 100; num2++)<br />
                {<br />
                    //Create the current Example<br />
                    Example e1 = new Example();<br />
                    e1.num1 = num1;<br />
                    e1.num2 = num2;<br />
                    //Insert into list and then sort (By Example.CompareTo)<br />
                    m_List.Add(e1);<br />
                    m_List.Sort();<br />
<br />
                    //I want just 100 result on the list and not 10,000^2<br />
                    if (m_List.Count > 100)<br />
                        m_List.RemoveAt(100);<br />
                }<br />
<br />
            //In the end i will have the best result 100 result<br />
<br />
        }<br />
        public Example this[int num]<br />
        {<br />
            get { return this.m_List[num]; }<br />
        }<br />
<br />
<br />
    }<br />
<br />

The problem is that every time i need to sort all the list. What is the best way to do it in C# by this process:
1. Insert an object to Sorted Array/List in the right place.
2. If the Current Instance of an object is Smaller then the biggest object in the 100 small object list (by Some IComparable functions):
2.1 Remove the biggest object from the list.

by This process i want to remaine with the smallest object in 100 list.
what is the best way to do it because i don't want to sort the Array every iteration if the Array/List is allready sorted.

PIEBALDconsult26-Jul-09 4:39

26-Jul-09 4:39

How about a System.Collections.Generic.SortedList<T> ?

See here[^]

(But it seems to say that it can't contain duplicate keys. Might you have duplicates?)

Also, you wouldn't need to sort after each insert, only before retrieving.

modified on Sunday, July 26, 2009 10:48 AM

bonzaiholding26-Jul-09 6:15

26-Jul-09 6:15

Yes , i don't have key as the value of the function. It can be the same value and this is the reason that i can't Use SortedList<>, Is there another way?

PIEBALDconsult26-Jul-09 6:26

Re: Insert Obejct to sorted list [modified]

26-Jul-09 6:26

There's always another way. Big Grin | :-D

If there's a duplicate for highest value, which would you remove? Or contain both?

Do you want 100 items or all the items with the bottom 100 values? Or would it matter?

bonzaiholding26-Jul-09 6:31

26-Jul-09 6:31

I want to have all the 100 items with the best result even if all of them have the same value. (Its very big range of data , more then 10^50 Items) And i want the best 100 items.

What should i do?

modified on Sunday, July 26, 2009 12:39 PM

PIEBALDconsult26-Jul-09 6:51

26-Jul-09 6:51

But what if items 95 - 105 all have the same value? Does it matter which ones you discard?

bonzaiholding26-Jul-09 20:39

26-Jul-09 20:39

In This case i does not matter, You can just save the first one : (Example of the result)

1. 0.212132
2. 0.23
3. 0.23
4. 0.3
.
.
.
96. 2.299
97. 2.299
98. 2.3
99. 2.3
100. 2.3

Luc Pattyn26-Jul-09 11:32

Luc Pattyn

26-Jul-09 11:32

bonzaiholding wrote:
more then 10^50 Items

Stop right there, no need to optimize anything, there isn't enough life in your PC to ever finish such a job, provided you would be willing to pay for the energy it will take.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

The quality and detail of your question reflects on the effectiveness of the help you are likely to get.
Show formatted code inside PRE tags, and give clear symptoms when describing a problem.

PIEBALDconsult26-Jul-09 14:49

26-Jul-09 14:49

But they're very small items. Waffer thin.

Martijn Boeker26-Jul-09 21:55

Martijn Boeker

26-Jul-09 21:55

I think you can do it this way.

In the loop, first collect the values (without sorting) in a list up to a certain number, say 1000 values. When it reaches 1000 values, re-sort the list and keep only the top 100 using GetRange(). Then continue adding to the list. This will prevent the algorithm from sorting all the time while keeping memory usage limited. The number 1000 should be a variable and you should experiment with it to find a value that gives you the best performance.

In your example:

int maxSize = 1000;

for (int num1 = 1; num1 <= 100; num1++)
for (int num2 = 1; num2 <= 100; num2++)
{
  //Create the current Example
  Example e1 = new Example();
  e1.num1 = num1;
  e1.num2 = num2;

  //Insert into list 
  m_List.Add(e1);

  // Sort only after certain treshold.
  if (m_List.Count >= maxSize)
  {
    // sort
    m_List.Sort();

    // Get top 100.
    m_List = m_List.GetRange(0, 100);
  }
}

// Sort and select top 100 after loop, because the list may be between 100 and maxSize.

// sort
m_List.Sort();

if (m_List.Count > 100)
{
  // Get top 100.
  m_List = m_List.GetRange(0, 100);
}

I must agree though, doing this 10^50 times is impossible. Your computer does something in the order of 10^9 processor instructions per second, per day say 10^14, per year say 10^16, in a hundred years 10^18... (I may be a bit off, but you get the idea..) Or are there any mice involved? Big Grin | :-D

bonzaiholding26-Jul-09 22:40

26-Jul-09 22:40

This is what i did, The problem is that every iteration i need to sort the list that is allready sorted.
The Only thing that i need is to Insert the object into the right place in the sorted list and then Remove the last object on the list.

Do you have any idea what can i do?

modified on Monday, July 27, 2009 7:27 AM