Develop Reference

Simulate CTRL down until I desire in c#?

I'm trying to simulate a user pressing ctrl down, the main goal would be in a datagridview when I select something programarly (initially) I dont want the user to then change that selection if not just add on to it or subtract, just as if you were to hold ctrl + left mouse click. I have no idea where to even begin. I tried to create a selection change event conbined with logicals but that will cause an infinite loop since we would be selecting one by a user then the code change other and other etc infinitely triggering that event. Please help, I'm sort of new to coding. I also don't know how to determine whether a ctrl key has been pressed, is pressed and being held.
private void selecttionh(object sender, EventArgs e)
{
if (stage == "4A" || stage == "3B" && ModifierKeys.HasFlag(Keys.Control))
{
int nothing = 0;
btnclickercl bt = new btnclickercl();
bt.dataGridView1_SelectionChanged(sender, e, dataGridViewReslist, dataGridViewnewres, nothing);
}
if (stage == "4A" || stage == "3B" && (ModifierKeys & Keys.Control) != Keys.Control)
{
MessageBox.Show("Please Press and hold " + "'ctrl'" + " to continue");
dataGridViewReslist.ClearSelection();
for (int i = 0; i < ResRoomSelections.Count; i++)
{
dataGridViewReslist.Rows[ResRoomSelections[i][0]].Cells[ResRoomSelections[i][1]].Selected = true;
dataGridViewReslist.Rows[ResRoomSelections[i][0]].Cells[(ResRoomSelections[i][1]) + 1].Selected = true;
}
}
else
{
dataGridViewReslist.ClearSelection();
for (int i = 0; i < ResRoomSelections.Count; i++)
{
dataGridViewReslist.Rows[ResRoomSelections[i][0]].Cells[ResRoomSelections[i][1]].Selected = true;
dataGridViewReslist.Rows[ResRoomSelections[i][0]].Cells[(ResRoomSelections[i][1]) + 1].Selected = true;
}
}
}

The way to make this happen is to store the selection state separately, update it when the user clicks a cell, then re-apply it. This prevents the selection from being lost every time they click. If you hook the proper event handlers (mouseup, not click) you can do this without the screen flickering and otherwise being a mess to look at.
Everything you need is in this class, including an extension method SetupToggledSelectionMode(), which is your entry point.
static public class Example
{
static private bool[][] GetSelectionState(DataGridView input)
{
int rowCount = input.Rows.Count;
int columnCount = input.Columns.Count;
var result = new bool[rowCount][];
for (var r = 0; r < rowCount; r++)
{
result[r] = new bool[columnCount];
for (var c = 0; c < columnCount; c++)
{
var cell = input.Rows[r].Cells[c];
result[r][c] = cell.Selected;
}
}
return result;
}
static private void SetSelectionState(DataGridView input, bool[][] selectionState)
{
for (int r = 0; r <= selectionState.GetUpperBound(0); r++)
{
for (int c = 0; c <= selectionState[r].GetUpperBound(0); c++)
{
input.Rows[r].Cells[c].Selected = selectionState[r][c];
}
}
}
static public void SetupToggledSelectionMode(this DataGridView input)
{
bool[][] selectionState = GetSelectionState(input); //This will be stored in a closure due to the lambda expressions below
input.CellMouseUp += (object sender, DataGridViewCellMouseEventArgs e) =>
{
selectionState[e.RowIndex][e.ColumnIndex] = !selectionState[e.RowIndex][e.ColumnIndex];
SetSelectionState(input, selectionState);
};
input.SelectionChanged += (object sender, EventArgs e) =>
{
if (selectionState != null)
{
SetSelectionState(input, selectionState);
}
};
}
}
To use, populate your gridview, set up the initial selection programmatically, and call it like this:
myDataGrid.DataSource = myData;
myDataGrid.Refresh();
myDataGrid.SelectAll();
myDataGrid.SetupToggledSelectionMode();
The SetupToggledSelectionMode() method will register the necessary event handlers and store the selection state of the grid in a closed variable accessible to both handlers. So you won't have to declare anything additional; just call the method.

Thank you for this, this really helped me. all I did was to make it more efficient.Since it would call the Selection change every step of the way, so I got rid of that event completely and only kept the CellMouseup Event.
static private bool[][] GetSelectionState(DataGridView input)
{
int rowCount = input.Rows.Count;
int columnCount = input.Columns.Count;
var result = new List<int[]>();
for (var r = 0; r < rowCount; r++)
{
for (var c = 0; c < columnCount; c++)
{
if(input.Rows[r].Cells[c].Selected==true)
{
result.add(new int[]{r,c});//will keep only the integer of selected items
}
}
}
return result;//this for me was a recycled variable it can be used or recycled from somewhere else
}
private void SetSelectionState(DataGridView input,result)
{
for (int i=0;i<result.Count;i++)
{
input.Rows[result[i][0]].Cells[result[i][1]].Selected = true;
}
}
public void SetupToggledSelectionMode(DataGridView input,result)
{
for (int i=0;i<result.Count;i++)
{
if(result[i].SequenceEqual(new int[] { e.RowIndex, e.ColumnIndex }))
{
result.RemoveAt(i);
continueer = 1;
break;
}
}
if (continueer == 0)
{
ResRoomSelections.Add(new int[] { e.RowIndex, e.ColumnIndex });
}
SetSelectionState(input);
//whatever else you need to do
}
I know there is still a better way to search List but I could not get a lamda search to work so I just used brute force
-Thank you John Wu for all

How to get values inside while loop and put it outside c# winform Crystal report

I've been searching this page and other pages in this matter. I know it's not possible to get the data inside the while loop with direct assigning of variables, so I've tried to put it to label before and it works but only to the first value of the finalcred and finaldeb. It will not reset to fetch another value, so my real question is; Is there any other way to get the value inside the while loop and use it outside?
I have tried to declare it outside while and assign default value and the result will always be the default. It will not change.
r = t.NewRow();
//somecode..all good here
while (counterdate <= monthval)
{
//allgood in this part
totalcred = 0;
totaldeb = 0;
balance = 0;
crednum = 0;
debnum = 0;
if (readgetcode1.HasRows)
{
while (readgetcode1.Read())
{
readgetcred.Read();
readgetdeb.Read();
if (readgetdeb.HasRows)
{
debnum = Convert.ToDecimal(readgetdeb.GetValue(0));
}
else
{
debnum = 0;
}
if (readgetcred.HasRows)
{
crednum = Convert.ToDecimal(readgetcred.GetValue(0));
}
else
{
crednum = 0;
}
totalcred += crednum;
totaldeb += debnum;
if (strType == "Debit")
{
balance = totaldeb - totalcred;
}
else
{
balance = totalcred - totaldeb;
}
allbal += balance;
}
}
else
{
allbal = 0;
}
if (readprevCred.HasRows)
{
prevBalNum = Convert.ToDecimal(readprevBal.GetValue(0));
}
else
{
prevBalNum = 0;
}
if (strType == "Debit")
{
finaldeb = prevBalNum + allbal;
finalcred = 0;
}
else
{
finalcred = prevBalNum + allbal;
finaldeb = 0;
}
counterdate++;
}//while counterdate looping
r["accntCode"] = codevalue;
r["accntName"] = accntnameval;
r["DebitAmount"] = finaldeb;//this is the problem
r["CreditAmount"] = finalcred;;//this is the problem
t.Rows.Add(r);
//while readcodecheck in counter for code

Dynamic ObservableCollection in TreeView?

I Have this problem where I can´t load my data into my TreeView but I have to do it manually instead. My static solution looks like this:
public static ObservableCollection<ClassOfDoom> GetAll()
{
ObservableCollection<ClassOfDoom> listToReturn = new ObservableCollection<ClassOfDoom>();
ClassOfDoom treeItem = null;
OUViewModel ouvm = new OUViewModel();
int[] tempOU = ouvm.HierarchyIntOU;
int[] tempP = ouvm.HierarchyIntParent;
treeItem = new ClassOfDoom("Root");
treeItem.cID = tempOU[0];
treeItem.pID = tempP[0];
for (int i = 0; i < ouvm.HierarchyIntParent.Length; i++)
{
if (treeItem.cID == tempP[i])
{
treeItem.ClassOfDooms.Add(new ClassOfDoom(tempOU[i].ToString()));
treeItem.ClassOfDooms.Last().pID = tempP[i];
treeItem.ClassOfDooms.Last().cID = tempOU[i];
for (int i1 = 0; i1 < ouvm.HierarchyIntParent.Length; i1++)
{
if (treeItem.ClassOfDooms.Last().cID == tempP[i1])
{
treeItem.ClassOfDooms.Last().Countries.Add(new ClassOfDoom(tempOU[i1].ToString()));
}
}
}
}
listToReturn.Add(treeItem);
return listToReturn;
}
This works but as you can see it´s only three levels and I wan´t a dynamic amount of levels. If someone wonders my ClassOfDooms list looks like this:
public ObservableCollection<ClassOfDoom> ClassOfDooms
{
get
{
if (classOfDooms == null) classOfDooms = new ObservableCollection<ClassOfDoom>();
return classOfDooms;
}
set { classOfDooms = value; }
}
I want to state again that I have no trouble reading data from my database or anything like that. The TreeView get´s the right information just not all of it.
EDIT: I solved it myself like this:
ClassOfDoom[] asdfDooms = new ClassOfDoom[ouvm.HierarchyIntParent.Length];
for (int i = 0; i < ouvm.HierarchyIntParent.Length; i++)
{
asdfDooms[i] = new ClassOfDoom();
asdfDooms[i].cID = tempOU[i];
asdfDooms[i].pID = tempP[i];
asdfDooms[i].name = tempPersonName + asdfDooms[i].cID.ToString();
}
for (int aint = 0; aint < ouvm.HierarchyIntParent.Length; aint++)
{
for (int i = 0; i < ouvm.HierarchyIntParent.Length; i++)
{
if (asdfDooms[aint].cID == asdfDooms[i].pID)
{
asdfDooms[aint].classOfDooms.Add(asdfDooms[i]);
}
}
}
listToReturn.Add(asdfDooms[0]);

Try implementing the INotifyPropertyChanged interface in conjunction with the HierarchicalDataTemplate control, this should ensure that changes made to the underlying data structure are reflected in the TreeView structure.

Autoexpand textbox while typing

I am needing an autoexpanding textbox like facebook has for it's status updates. I have code for it but for some reason it's not fully working correctly. It's updating the textbox and expanding it, but it is doing it way too soon. i am wanting it to expand when it gets to the end of the line. But it is doing it after 20 characters are entered! I have two different methods i have tried, they both do the same thing. Any suggestions on changing my code?
function sz(t) {
var therows = 0
var thetext = document.getElementById(t.id).value;
var newtext = thetext.split("\n");
therows += newtext.length
document.getElementById(t.id).rows = therows;
return false;
}
function sz(t)
{
a = t.value.split('\n');
b = 1;
for (x = 0; x < a.length; x++)
{
if (a[x].length >= t.cols)
{
b += Math.floor(a[x].length / t.cols);
}
}
b += a.length;
if (b > t.rows)
{
t.rows = b;
}
}

Check out this fiddle.
I think your problem was using txtbox.id rather than just passing the id.

Refactor that code ... Controls.Find method

OK, I have a code (see below):
void M1()
{
for (int i = 1; i < 10; i++)
{
Control[] carr = this.Controls.Find("Number" +
(i - 1).ToString() +
"CheckBox", true);
if ((carr != null) && (carr.Length > 0))
{
CheckBox enableCB = carr[0] as CheckBox;
enableCB.Checked = i % 2 == 0 ? true : false; // or any other value
}
}
}
I don't like iteration with using Controls.Find method. Can I replace it with something easier ?
PS: all the NumberXCheckBox (X>=0 and X<=8) presented on the form.
LINQ enabled, .net 3.5, Visual studio 2008.

Instead of searching by name, can you wrap your CheckBox controls in a container that means you can just iterate through the controls in the container?

I would encourage you to introduce a field in your type to keep references to your checkboxes (an array, a list, a dictionary -- you choose.) This way you'll no longer need to use this non-typed and somewhat ugly find-control-by-key-method.
Anyway, if you're still in .NET 2.0 and prefer to use the Find method, you could simplify a little bit your loop:
for (var i = 0; i <= 8; i++)
{
var controls = Controls.Find("Number" + i + "CheckBox", true);
if (controls.Length > 0)
{
var checkBox = controls[0] as CheckBox;
if (checkBox != null)
checkBox.Checked = i%2 == 0;
}
}
The latest non-nullity test on checkbox can probably be omitted.

If you are using 3.5 or otherwise have LINQ available you could do the following
for ( int i = 0; i < 9; i++) {
var control = this.Controls
.Find(String.Format("Number{0}Checkbox", i))
.Cast<CheckBox>()
.FirstOrDefault();
if ( control != null ) {
control.Checked = (i % 2) != 0;
}
}

More linq-y
for (int i = 0; i < 10; i++) {
var c = (from CheckBox c in this.Controls.Find(String.Format(CultureInfo.InvariantCulture, "Number{0}CheckBox", i-1), true)
select c).FirstOrDefault();
if (c != null) {
c.Checked = i % 2 == 0 ? true : false;
}
}

Here's one without linq, but cleaned up the code a little bit.
for (int i = 1; i < 10; i++)
{
Control[] carr = this.Controls.Find("Number" + (i - 1) + "CheckBox", true);
if (carr.Length <= 0) continue;
CheckBox enableCB = carr[0] as CheckBox;
enableCB.Checked = (i % 2) == 0;
}
[Edit: added the Find(..) code to show why you don't have to check for null]
Here's the frameworks internal code for the Find function. I've added a couple of comments in it
public Control[] Find(string key, bool searchAllChildren)
{
if (string.IsNullOrEmpty(key))
{
throw new ArgumentNullException("key", SR.GetString("FindKeyMayNotBeEmptyOrNull"));
}
// Will always return an ArrayList with zero or more elements
ArrayList list = this.FindInternal(key, searchAllChildren, this, new ArrayList());
// Will always return an Array of zero or more elements
Control[] array = new Control[list.Count];
list.CopyTo(array, 0);
return array;
}