How do I auto select a item in a ListBox then set it as text in a TextBox then wait 3 seconds and move onto the next line down and repeat?
private void button2_Click(object sender, EventArgs e)
{
timer.Start();
}
private void timer1_Tick(object sender, EventArgs e)
{
foreach (var item in listBox1.Items)
{
textBox2.Text = listBox1.Text;
}
}
The ListBox has a lot of useful properties:
private void timer1_Tick(object sender, EventArgs e)
{
textBox2.Text = listBox1.SelectedItem.ToString();
listBox1.SelectedIndex = (listBox1.SelectedIndex + 1) % listBox1.Items.Count;
}
% is the modulo operation and returns the remainder of the division. It ensures that always values between 0 and SelectedIndex - 1 are returned and makes the indexes repeat.
Also, if no item is selected, you will get a SelectedIndex of -1 and SelectedItem will be null. So be sure to either avoid these cases by setting appropriate initial conditions or add checks.
E.g.:
if (listBox1.Items.Count > 0) {
if (listBox1.SelectedIndex == -1) {
listBox1.SelectedIndex = 0;
}
... // code of above
}
Your timer1_Tick should be something like this:
public Form1()
{
InitializeComponent();
timer1.Interval = 3000;
}
private void timer1_Tick(object sender, EventArgs e)
{
Random rnd = new Random();
int i = rnd.Next(0, listBox1.Items.Count - 1);
textBox2.Text = listBox1.Items[i].ToString();
}
EDIT:
int i;
private void timer1_Tick(object sender, EventArgs e)
{
if (i > listBox1.Items.Count - 1)
{
i = 0;//Set this to repeat
return;
}
textBox2.Text = listBox1.Items[i].ToString();
i++;
}
And also set the timer's Interval to 3000.
Related
I have to make a quantile configuration and I have to set a condition so that the second value is higher than the first, the third value is higher than the second and so on. I am using numericupdowns and the value is set by the user. I tried to implement this code but it always shows a message box error even if the values are correct. This is my code so far (using Visual studio and C#):
decimal min = 1;
//when the first numeric is changed:
private void numericUpDown1_ValueChanged(object sender, EventArgs e)
{
numericUpDown1.Minimum = min;
min = numericUpDown1.Value;
}
private void numericUpDown2_ValueChanged(object sender, EventArgs e)
{
min++;
numericUpDown2.Minimum = min;
min = numericUpDown2.Value;
}
private void numericUpDown3_ValueChanged(object sender, EventArgs e)
{
min++;
numericUpDown3.Minimum = min;
min = numericUpDown3.Value;
}
private void numericUpDown4_ValueChanged(object sender, EventArgs e)
{
min++;
numericUpDown4.Minimum = min;
numericUpDown4.Maximum = 99;
}
private void button_OK_Click(object sender, EventArgs e)
{
if (
numericUpDown1.Value > numericUpDown2.Value ||
numericUpDown2.Value > numericUpDown3.Value ||
numericUpDown3.Value > numericUpDown4.Value )
{
MessageBox.Show(
"Quantiles are not filled correctly",
"The quantiles aren't filled in correctly", MessageBoxButtons.OK, MessageBoxIcon.Error);
textBoxName.Select();
DialogResult = DialogResult.None;
return;
}
}
You need to keep all the NumericUpDown value inside a List or an array where you can manipulate them like a single entity trhough a loop.
Of course changing the minimum value of one of the numeric elements should be linked to a check for the current value inside that control because you can't have a current value lesser than the new minimum value.
So the first thing to do is to create a global variable inside your form class where you keep the references to all the numeric controls that you want to synchronize
public class Form1
{
private List<NumericUpDown> numbers = new List<NumericUpDown>();
public Form1 : Form
{
InitializeComponent();
numbers.AddRange(new [] {n1, n2,n3,n4,n5});
}
......
}
Now you can write a method like this one that adjust the minimum on all the numeric included in the list
private void UpdateMinimum()
{
for (int x = 0; x < numbers.Count-1; x++)
{
if(numbers[x].Value > numbers[x+1].Value)
numbers[x+1].Value = numbers[x].Value;
numbers[x+1].Minimum = numbers[x].Value;
}
}
finally you have all your NumericUpDown event ValueChanged call the same method
void numerics_ValueChanged(object sender, EventArgs e)
{
UpdateMinimum();
}
If you want to set a condition so that the second value is higher than the first, the third value is higher than the second and so on, you can refer to the following code:
private void numericUpDown1_ValueChanged(object sender, EventArgs e)
{
numericUpDown1.Minimum = 1;
}
private void numericUpDown2_ValueChanged(object sender, EventArgs e)
{
numericUpDown2.Minimum = numericUpDown1.Value + 1;
}
private void numericUpDown3_ValueChanged(object sender, EventArgs e)
{
numericUpDown3.Minimum = numericUpDown2.Value + 1;
}
private void numericUpDown4_ValueChanged(object sender, EventArgs e)
{
numericUpDown4.Minimum = numericUpDown3.Value + 1;
numericUpDown4.Maximum = 99;
}
private void button_OK_Click(object sender, EventArgs e)
{
if (
numericUpDown1.Value > numericUpDown2.Value ||
numericUpDown2.Value > numericUpDown3.Value ||
numericUpDown3.Value > numericUpDown4.Value)
{
MessageBox.Show(
"Quantiles are not filled correctly",
"The quantiles aren't filled in correctly", MessageBoxButtons.OK, MessageBoxIcon.Error);
textBoxName.Select();
DialogResult = DialogResult.None;
return;
}
}
Here is the test result:
I am writing a c# windows form code to
get the number from button1 and button2 and add them together in a text box but The compiler argues on the convert.toint32(textbox3.text) statement
and also it increases the value of the two variable and three variable how can I keep it constant but increase the value of textbox
and I need a solution?
int Three = 0;
int Two = 0;
//int one = 0;
int sum = 0;
// int sum = 0;
//int dec = 0;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// MessageBox.Show("Enter the teams` name");
}
private void button1_Click(object sender, EventArgs e)
{
//Three += 3;
//textBox3.Text = sum.ToString();
Three += 3;
sum = Convert.ToInt32(textBox3.Text) + Three;
textBox3.Text = sum.ToString();
}
private void button2_Click(object sender, EventArgs e)
{
Two += 2;
sum = Two + Convert.ToInt32(textBox3.Text) + Three;
textBox3.Text =Convert.ToInt32(textBox3.Text) + Two.ToString();
}
private void textBox3_TextChanged(object sender, EventArgs e)
{
textBox3.Text = 0.ToString();
}
`
Change
sum = Convert.ToInt32(textBox3.Text) + Three;
To
sum = Convert.ToInt32(textBox3.Text == "" ? "0" : textBox3.Text) + 3;
Also, remove
private void textBox3_TextChanged(object sender, EventArgs e)
{
textBox3.Text = 0.ToString(); // this
}
because it doesn't make any sense.
Your variables belong to class and they are accessible for initialization in constructor. This can be done in many ways but you need to check if textboxes have values then try to convert it and add it.
private int Two;
private int Three;
private int sum;
public Form1()
{
this.Two = 0;
this.Three = 0;
this.sum = 0;
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// MessageBox.Show("Enter the teams` name");
}
private void button1_Click(object sender, EventArgs e)
{
this.Three += 3;
sum = textBox3.Text != String.Empty ? Convert.ToInt32(textBox3.Text) : 0;
textBox3.Text = Convert.ToString(sum + this.Three);
}
... same for number Two
private void textBox3_TextChanged(object sender, EventArgs e)
{
textBox3.Text = "0";
}
How do I set the maximum value of my progress bar to be the value that was input by the user in the textbox on my windows application form? Here is my current code. I need the max value to be the value that was Input. I also need it to print the current time and date.
private void btnProgNum_Click(object sender, EventArgs e)
{
progBarNum.Maximum = 10;
backgroundWorker1.WorkerReportsProgress = true;
backgroundWorker1.RunWorkerAsync();
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
int i = 1;
int endProg = Convert.ToInt32(txtNumProg.Text);
while (i <= endProg )
{
System.Threading.Thread.Sleep(500);
backgroundWorker1.ReportProgress(i);
i++;
}
}
private void backgroundWorker1_ProgressChanged_1(object sender, ProgressChangedEventArgs e)
{
progBarNum.Value = e.ProgressPercentage;
lblOutProg.Text = DateTime.Now.ToString();
}
}
private void btnProgNum_Click(object sender, EventArgs e)
{
int n = int.Parse(txtNumProg.Text);
int counter = 0;
while (counter != n + 1)
{
counter++;
}
progBarNum.Maximum = n;
backgroundWorker1.RunWorkerAsync();
backgroundWorker1.WorkerReportsProgress = true;
}
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
int i = 1;
int n = int.Parse(txtNumProg.Text);
while (i <= n )
{
System.Threading.Thread.Sleep(500);
backgroundWorker1.ReportProgress(i);
i++;
}
}
private void backgroundWorker1_ProgressChanged_1(object sender, ProgressChangedEventArgs e)
{
progBarNum.Value = e.ProgressPercentage;
lblOutProg.Text = DateTime.Now.ToString();
}
Here is a update of me fixing the problem i had with the passing a new max value for the progress bar. Now I dont think i need a second while-loop for it. it works this way, but seems like it only is ment to require one while loop.
I have a form in C# Windows Forms, every time a button is clicked I change my index, and I want to change the content of a Label based on this index. The only choice I found is label_click however I want the change to be automatically. Any idea about this?
// lines a gloab list of strings and index changes from a button click
private void label1_Click(object sender, EventArgs e)
{
label1.Text = "videos/" + lines[index] + ".mp4";
}
private void button4_Click(object sender, EventArgs e)
{
index++;
}
private void button3_Click(object sender, EventArgs e)
{
if (index >= 1)
index--;
}
Try the following
List<string> lines = new List<string>(){/*initialization here*/}
int index = 0;
private void button4_Click(object sender, EventArgs e)
{
//Ensure index is inside List bounds.
index = Math.Min(lines.length -1 , index + 1);
ChangeLabelText()
}
private void button3_Click(object sender, EventArgs e)
{
//Ensure index is inside List bounds.
index = Math.Max(0 , index - 1);
ChangeLabelText()
}
void ChangeLabelText() => label1.Text = "videos/" + lines[index] + ".mp4";
I have a C# winforms application and I am trying to get a button working that will select the next row in a datagridview after the one curently selected.
The code I have so far is:
private void button4_Click(object sender, EventArgs e)
{
try
{
Int32 selectedRowCount = dataGridView1.Rows.GetRowCount(DataGridViewElementStates.Selected);
// index out of range on this line
dataGridView1.Rows[dataGridView1.SelectedRows[selectedRowCount].Index].Selected = true;
dataGridView1.FirstDisplayedScrollingRowIndex = selectedRowCount + 1;
}
catch (Exception ex)
{
return;
}
But on running this it throws an exception. Could anyone point out where I may be going wrong. The thrown error is: Index is out of range
try this:
int nRow;
private void Form1_Load(object sender, EventArgs e)
{
nRow = dataGridView1.CurrentCell.RowIndex;
}
private void button1_Click(object sender, EventArgs e)
{
if (nRow < dataGridView1.RowCount )
{
dataGridView1.Rows[nRow].Selected = false;
dataGridView1.Rows[++nRow].Selected = true;
}
}
First, set "Multiselect" property of datagridview to false.
int currentRow = dataGridView1.SelectedRows[0].Index;
if (currentRow < dataGridView1.RowCount)
{
dataGridView1.Rows[++currentRow].Selected = true;
}
It will select the next row in the datagridview.
Select Row and Cell for better solution.
This solution move row indicator on DataGridView.
private void _GotoNext(object sender, EventArgs e)
{
int currentRow = DataGridView1.SelectedRows[0].Index;
if (currentRow < DataGridView1.RowCount - 1)
{
DataGridView1.Rows[++currentRow].Cells[0].Selected = true;
}
}
private void _GotoPrev(object sender, EventArgs e)
{
int currentRow = DataGridView1.SelectedRows[0].Index;
if (currentRow > 0)
{
DataGridView1.Rows[--currentRow].Cells[0].Selected = true;
}
}
It's here:
dataGridView1.SelectedRows[selectedRowCount]
If you have 3 selected rows then selectedRowCount = 3 and there are three rows with indexes: 0, 1, 2.
You are trying to access #3 which doesn't exist.
this example to read value cell or column is number 4 of datagridview
int courow = dataGridView1.RowCount-1;
for (int i=0; i < courow; i++)
{
MessageBox.Show(dataGridView1.Rows[i].Cells[4].Value.ToString());
}
I prefer this row selection :
First check if no multiselect : number_of_data
Then get the select cell (or row) : row_index
private void next_click(object sender, EventArgs e)
{
int number_of_data = dataGridView.SelectedRows.Count;
if (number_of_data > 1) return;
int row_index = dataGridView.SelectedCells[0].RowIndex;
if (row_index < dataGridView.RowCount-1)
{
dataGridView.Rows[row_index++].Selected = false;
dataGridView.Rows[row_index].Selected = true;
}
// Do something
}
enter code here private void Form1_Load(object sender, EventArgs e)
{
X = dataGridView1.CurrentCell.RowIndex;//int x;
}
enter code here private void button2_Click(object sender, EventArgs e)
{
if (dataGridView1.Rows.Count > 0)
{
this.dataGridView1.ClearSelection();
dataGridView1.Rows[0].Selected = true;
}
}
enter code here private void button3_Click(object sender, EventArgs e)
{
if (X < dataGridView1.RowCount)
{
if (X != dataGridView1.RowCount - 1)
{
dataGridView1.ClearSelection();
dataGridView1.Rows[++X].Selected = true;
}
else
{
button2_Click(sender, e);//this else with make it loop
X = 0;
}
}
}
dgv_PhotoList.Rows[dgv_PhotoList.CurrentRow.Index+1].Selected = true;