So I'm trying to populate a combo-box with the available com ports, on a settings page.
Once the setting as been chosen I would like that setting to be retained and be available globally with the save settings function via a save button. I think there must be an easier way than this!
private void Form2_Load(object sender, EventArgs e)
{
pumpPort = SerialPort.GetPortNames();
this.comboBox1.Items.AddRange(pumpPort);
this.comboBox1.SelectedItem = Properties.Settings.Default.Setting;
Properties.Settings.Default.Save();
switch (Properties.Settings.Default.Setting)
{
case "COM1":
this.comboBox1.SelectedItem = Properties.Settings.Default.COMPORT1;
break;
case "COM2":
this.comboBox1.SelectedItem = Properties.Settings.Default.COMPORT2;
break;
default:
break;
}
Needless to say this does not retain any settings after form2 is closed. I would like it to retain even after the program has exited let alone form2.
When you do this:
this.comboBox1.SelectedItem = Properties.Settings.Default.Setting;`
You are setting the selected item of the combo box.
I think you really want to reverse that.
Properties.Settings.Default.Setting = this.comboBox1.SelectedItem
You would want to do the assignment in the change event of the combo box however, so that when a user selects the value, your settings are updated and saved.
private void Form2_Load(object sender, EventArgs e)
{
pumpPort = SerialPort.GetPortNames();
this.comboBox1.Items.AddRange(pumpPort);
}
public void comboBox1_SelectedIndexChanged(object sender, EventArgs eventArgs)
{
Properties.Settings.Default.Setting = this.comboBox1.SelectedItem;
Properties.Settings.Default.Save();
}
As #wbennett notes in his answer, make sure that the indexchanged event is set in either your codebehind, or preferably in your designer.
You need to update the default setting and invoke save on the comboBox1 change event.
Like so:
private void Init()
{
...
this.comboBox1.SelectedIndexChanged +=
new System.EventHandler(ComboBox1_SelectedIndexChanged);
}
private void ComboBox1_SelectedIndexChanged(object sender,
System.EventArgs e)
{
//other event code
...
var comboBox = (ComboBox)sender;
var port = (string)comboBox1.SelectedItem;
Properties.Settings.Default.Setting = port;
Properties.Settings.Default.Save();
...
}
Related
I am creating a program using WinForms so users can input info into textboxes on one form which then are saved into a Listbox on another form. I would like to be able to edit the items saved in the listbox by opening the original form on a button click. Really struggling with it as I can't think of the code and I can't seem to find a solution.
My Code:
private void btnAdd_Click(object sender, EventArgs e)
{
RoomDisplayForm newRoomDisplayForm = new RoomDisplayForm();
newRoomDisplayForm.ShowDialog();
if(newRoomDisplayForm.DialogResult == DialogResult.OK)
{
listBoxRooms.Items.Add(newRoomDisplayForm.value);
}
newRoomDisplayForm.Close();
}
private void btnRemove_Click(object sender, EventArgs e)
{
this.listBoxRooms.Items.RemoveAt(this.listBoxRooms.SelectedIndex);
}
private void btnEdit_Click(object sender, EventArgs e)
{
}
So i've got a Add and Remove button which work perfectly just need a solution to the edit button.
Thanks in advance
I'm guessing newRoomDisplayForm.value is a property or a public member inside the form. You just need to do something like this:
private void btnEdit_Click(object sender, EventArgs e)
{
if(listBoxRooms.SelectedIndex < 0) return;
var tmpValue = listBoxRooms.Items[listBoxRooms.SelectedIndex].ToString();
RoomDisplayForm newRoomDisplayForm = new RoomDisplayForm();
newRoomDisplayForm.value = tmpValue;
newRoomDisplayForm.ShowDialog();
//TODO: inside "newRoomDisplayForm" set the value to the textbox
// ie.: myValueTextBox.Text = this.value;
if(newRoomDisplayForm.DialogResult == DialogResult.OK)
{
// replace the selected item with the new value
listBoxRooms.Items[listBoxRooms.SelectedIndex] = newRoomDisplayForm.value;
}
}
Hope it helps!
You can simply remove the listitem in that specific position, create a new item and add it again. it's kind of replacement.
I Create login form and want to put "remember me" check box on it.
But every time i open program it doesn't change.
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
if (checkBox1.Checked)
{
Project.Properties.Settings.Default.rememberMe = true;
Project.Properties.Settings.Default.Save();
}
else
{
Project.Properties.Settings.Default.rememberMe = false;
Project.Properties.Settings.Default.Save();
}
}
Also i want to save user login information, should i save them in app setting just like remember me setting or there is better way?
You're saving the settings, but you need to retrieve those settings too.
Subscribe to the Form's load event and set the value of the CheckBox.
private void Form1_Load(object sender, EventArgs e)
{
checkBox1.Checked = Project.Properties.Settings.Default.rememberMe;
}
Also, and this is just common practice, but your code could be shorter:
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
Project.Properties.Settings.Default.rememberMe = checkBox1.Checked;
Project.Properties.Settings.Default.Save();
}
So I am making an app in C# where it creates/edits existing .ini files. One of the features I am trying to add is that if I make changes to the .ini file via the c# app I created, and either try to close the app, open another .ini file or create a new file, it should prompt the user if they want to save the file. To accomplish this, I have a flag called dataChanged. In the TextChanged events in for the multiple textboxes, I set dataChanged = true; since changes were made to the file. However, for some reason as soon as I open the app, all the TextChange events fire up so even if I don't enter any values in the various textboxes, when I close the app, it prompts me to save the file (it shouldn't!).
App UI:
User inputs text in the textboxes.
Part of code regarding the 4 textboxes:
private void TextBox_TextChanged(object sender, TextChangedEventArgs e) //ifrs installer
{
dataChanged = true;
}
private void TextBox_TextChanged_1(object sender, TextChangedEventArgs e) //ifrs patchfile
{
dataChanged = true;
}
private void textBox3_TextChanged(object sender, TextChangedEventArgs e)
{
dataChanged = true;
}
private void textBox4_TextChanged(object sender, TextChangedEventArgs e)
{
dataChanged = true;
}
TextChanged event fires even when you set some Text. Apparently you set some initial text when app is loading.
You can subscribe to the event mannually after you set the initial value.
textBox4.TextChanged += textBox4_TextChanged;
or unsubscribe before you set the value and subscribe after that.
textBox4.TextChanged -= textBox4_TextChanged;
textBox4.Text = "Initial Value";
textBox4.TextChanged += textBox4_TextChanged;
Sounds to me like you're programmatically setting the textBoxN.Text properties.
What you might want to do is add an if (appInitialized) around your dataChanged = true; and only set appInitialized to true after the application is loaded, perhaps in your Form_Load event. This way, the initial loading doesn't set your variable. Another option is to only register the TextChanged event after you have already set the initial values. My guess is you registered the event using the designer and as a result it's firing for those initial settings because of where the designer adds event registration. Instead do the
textBox4.TextChanged += textBox4_TextChanged;
// Etc. for each text box
yourself after the .Text properties are set. Again, perhaps in your Form_Load.
I'm guessing you are loading the ini file when the program loads and this triggers to text changed event. I suggest doing something like this.
private void Form1_Load(object sender, EventArgs e)
{
LoadData();
}
private bool _LoadingData = false;
private bool _DataChanged = false;
private void LoadData()
{
try
{
_LoadingData = true;
// Load data
}
finally
{
_LoadingData = false;
}
}
public void DataChanged()
{
if (_LoadingData == false)
{
_DataChanged = true;
}
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
DataChanged();
}
I have a form that loads 3 pre-defined scores in a list box. I want to convert a selected score into a string, and then output that string in a textbox. So far i think i've converted the item to a string, and tried setting it to the textbox but it doesn't seem to be working.
private void frmStudentScores_Load(object sender, EventArgs e)
{
lstStudents.Items.Clear();
lstStudents.Items.Add("Joe Smith|93|92|98");
lstStudents.Items.Add("Mike Jones|56|61|33");
lstStudents.Items.Add("Rita Jackson|100|89|96");
lstStudents.SelectedIndex = 0;
if (this.lstStudents.SelectedIndex >= 0)
{
string a = lstStudents.Items.Cast<string>().ToString();
txtDisplay.Text = a;
}
btnUpdate.Enabled = false;
Assuming your question is about Windows Forms, One way to get the selected item is to use code like this:
txtDisplay.Text =lstStudents.SelectedItem.ToString();
It is common to want to get the selected item that the user has selected, to do this, you need to place the above code in an event to look like this for example:
private void lstStudents_SelectedIndexChanged(object sender, EventArgs e)
{
txtDisplay.Text = this.lstStudents.SelectedItem.ToString();
}
An event can be wired to the control either by code or via the VS IDE, you can't just copy and paste the above code. Ask me if you don't know how to do that.
If you want to grab the first item only, then Plutonix comment above applies. You don't need the IF statement.
Since this is the process at load time, why not try just :
private void frmStudentScores_Load(object sender, EventArgs e)
{
lstStudents.Items.Clear();
lstStudents.Items.Add("Joe Smith|93|92|98");
lstStudents.Items.Add("Mike Jones|56|61|33");
lstStudents.Items.Add("Rita Jackson|100|89|96");
lstStudents.SelectedIndex = 0;
txtDisplay.Text = lstStudents.Items[0].ToString();
btnUpdate.Enabled = false;
EDIT
then add at the listbox's event SelectedIndexChanged :
private void lstStudents_SelectedIndexChanged(object sender, EventArgs e)
{
txtDisplay.Text = lstStudents.Items[lstStudents.SelectedIndex].ToString();
}
i have an application here in winforms that am trying to make. This is how i want it to happen: whenever the user clicks on register visitor button the registration form should be opening. works fine. here is the function that is called in that case:
private void Register_Visitor_Load(object sender, EventArgs e)
On this form i have a textfield placed which i want to disable when the form loads. i wrote a line which disables the textbox on form load:
textbox1.enabled = false;
i placed the above line in the load function which is working fine. now i want to enable my textbox1 based on the checkbox checked. for this i wrote the code:
CheckState state = checkBox1.CheckState;
switch (state)
{
case CheckState.Checked:
{
textBox1.Enabled = true;
break;
}
case CheckState.Indeterminate:
case CheckState.Unchecked:
{
break;
}
now when i place the code above in the page load function nothing happens which is surely going to happen as that function is only called on form load. what am not getting is where to place the checkbox code so that my textbox is enable on runtime. other function are in response to button but what i want here it to instantly enable the textfield on runtime when the user checks the checkbox. kindly explain me how am i going to accomplish this!
You can use CheckStateChanged event; so whatever reason the checkBox1 is checked/unchecked/grayed you'll have the textBox1 properly enabled/disabled
private void checkBox1_CheckStateChanged(object sender, EventArgs e) {
textBox1.Enabled = (checkBox1.CheckState == CheckState.Checked);
}
you are placing code at wrong event.
Instead of placing in pageload place that code on chekchange event of checkbox.
That will help you.
private void chkDisable_CheckedChanged(object sender, EventArgs e)
{
if (((CheckBox)sender).Checked)
{
textBox1.Enable=true;
}
else
{
textBox1.Enable=false;
}
}
Place the above code inside the function which handles the event for check box.
In your case it is checkchanged status.
You can try this:
private void checkBox1_Click(object sender, EventArgs e)
{
if (checkBox1.Checked)
{
textBox1.Enabled = false;
}
else
{
textBox1.Enabled = true;
}
}
I did a hybrid of some of the above answers and it worked perfectly. I wanted the state of a button to be disabled upon loading the form, but then enabled if the user checks a box, here's the code:
private void checkBox1_CheckedChanged(object sender, EventArgs e)
{
button1.Enabled = (checkBox1.CheckState == CheckState.Checked);
}
private void Form1_Load(object sender, EventArgs e)
{
if (checkBox1.Checked)
{
button1.Enabled = true;
}
else
{
button1.Enabled = false;
}
}