i'm new in C# and I want to convert value of slider to textbox. One option i found is set binding for text box, but I need send value in event.
I tried some solutions, but not worked.
private void sliderName_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
Slider sliderName = sender as Slider;
TextBox textBoxName = new TextBox();
textBoxName.Text = sliderName.Value.ToString();
}
Thanks for helping and be patient with me. :)
You're creating a new TextBox, but not positioning it anywhere.
You should have your TextBox already on your form, and reference it by the name you gave it at design-time in the IDE. For example, if you just drop a TextBox on the form, the IDE will give it a name like textBox1, and you use it by that name:
private void sliderName_ValueChanged(object sender,
RoutedPropertyChangedEventArgs<double> e)
{
// Don't use the same name used on the form if you're
// declaring a variable here. Use a name that's local to
// this event.
Slider slide = sender as Slider;
// Use the IDE-set name here.
difficultyBox.Text = slide.Value.ToString();
}
Updated to reflect name change based on comment below.
OR an even faster way:
private void sliderName_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
textBox1.Text = ((Slider)sender).value.ToString();
}
The only difference between this post, and Ken's Post is that I am casting the sender as a slider while setting the text property of textBox1.
Just showing you different options and a different way of doing the same thing.
Your approach would probably work, except that you are declaring a new TextBox local to this event handler, so you'll never see anything on the screen.
Try setting the .Text property of a TextBox in your form;
private void sliderName_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
Slider sliderName = sender as Slider;
difficultyBox.Text = sliderName.Value.ToString();
}
Related
I have a datacontrol.cs(UserControl), which is contain textbox1 and codebehind window having a method with parameter of currentvalue
public void bindvalue(float currentvalue)
{
textbox1.Clear();
textbox1.Text = currentvalue.ToString();
}
I have a Form, Here added the usercontrol in this form and which contains a Button
So when clicking button it pass a currentvalue by the way of method to the datacontrol class like that .
private void button_click(object sender, EventArgs e)
{
float currentvalue = 1500.00f;
datacontrol obj = new datacontrol();
obj.bindvalue(currentvalue);
}
Everything working fine to me. It pass the current value to the usercontrol class and there current value assigned/added to the textbox1.Text = currentvalue.ToString();. It doesn't shows any error . But finally the textbox doesn't shows any value.
I used breakpoint to check the functionality. It gave current value to the textbox. But strange!!!..
I can't predict whats wrong in my code.
Helps appreciated.:)
Your instance of datacontrol with required value (1500.00f) does not exist on your form. You are only delcaring it, passing value and forgetting about it.
If you have already added user control to form and want to call bindvalue method of existing control, you should do the following:
private void button_click(object sender, EventArgs e)
{
float currentvalue = 1500.00f;
this.dataControl1.bindvalue(currentvalue);
}
Note that dataControl1 is the name of your user control on the form, it can be different from dataControl1.
If you want to create new user control and call bindvalue, you should add new instance on the form:
private void button_click(object sender, EventArgs e)
{
float currentvalue = 1500.00f;
datacontrol obj = new datacontrol();
obj.bindvalue(currentvalue);
this.Controls.Add(obj);
}
If it is already dynamically added control on the form, declare a field of Form class, assign new instance of it control, when you want it, and call to it as it shows in the first example.
You need add instance of datacontrol to the form
datacontrol obj = new datacontrol();
obj.bindvalue(currentvalue);
Controls.Add(obj);
You can simply make a call to bindvalue method by using the tagename of your user control in button click event handler.
Suppose the tag name is 'datacontrol', then you should use the following lines of code to achieve your task:
protected void Button1_Click(object sender, EventArgs e)
{
float myvalue = 150.50f;
datacontrol1.BindValue(myvalue);
}
Regards, Aamir ( .Net developer)
Please marks this thread as answer if it solved what were looking for... thanks
Is it possible to like refer a string as content for a TextBox in c#? I have a listbox with a bunch of objects in it. And each object contain a string. And when I select an object in the listbox I want its string to be the content in the TextBox, so that whatever I write gets saved to the string.
Like for example in Java you could have a PlainDocument in an object, and whenever you select a different object in a JList you could set the document in a JTextField to the objects PlainDocument.
You can either use Data Binding for an automated solution or you can manually listen for SelectedIndexChanged event of the list box and set the Text property in the event handler.
listBox1.SelectedIndexChanged += (o, e) => {
object selectedItem = listBox1.SelectedItem;
textBox1.Text = selectedItem != null ? selectedItem.ToString() : null;
};
The content of the textbox can be accessed using
myTextBox.Text
This property expects string, so your answer is Yes. I think simply assigning this property would do.
UPDATE
I think you need something like this(assuming you are using WinForms):
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
if(listBox1.SelectedItem != null)
textBox1.Text = listBox1.SelectedItem.ToString();
}
private void button1_Click(object sender, EventArgs e)
{
int index = listBox1.Items.IndexOf(listBox1.SelectedItem);
listBox1.Items.Remove(listBox1.SelectedItem);
listBox1.Items.Insert(index, textBox1.Text);
}
Though there is an action for TextChanged event of textbox in WinForms, but changing listbox from there is a bit tricky (ends up calling each other infinitely) as we are already changing textbox from the change event of listbox.
Adding a button to do this simplifies it a lot.
I have applied a ToolTip to textbox in C# such that the textbox has to accept the name of the user. In the ToolTip, I have types the instructions that only alphabets are welcome in the textbox, which is a success. But what I want is to make that ToolTip disappear when the user starts to type his name or moves to another textbox. The coding so far is;
ToolTip tt = new ToolTip();
String message = "Trying";
private void txtName_Enter(object sender, EventArgs e)
{
if (txtName.Text == String.Empty)
{
tt.Show(string.Empty, txtName, 0);
tt.Show(message, txtName, new Point(0, -2 * txtName.Height));
}
}
Help?
There is an event on the textbox called TextChanged. It fires as soon as the Text property of the control changes in value. Typing a character does change the Text property and therefor triggers the event.
Leveraging that knowledge, you can dismiss the tooltip as soon as Text is no longer empty like so:
private void txtName_TextChanged(object sender, EventArgs e)
{
var ctl = (Control) sender; // sender is a control
if (!String.IsNullOrEmpty(ctl.Text))
{
tt.SetToolTip(ctl, String.Empty);
}
}
Notice that this implementation can be used generically, by any control that you want to have this behavior.
In a TextBox I'm monitoring the text changes. I need to check the text before doing some stuff. But I can only check the old text in the moment. How can I get the new Text ?
private void textChanged(object sender, EventArgs e)
{
// need to check the new text
}
I know .NET Framework 4.5 has the new TextChangedEventArgs class but I have to use .NET Framework 2.0.
Getting the NEW value
You can just use the Text property of the TextBox. If this event is used for multiple text boxes then you will want to use the sender parameter to get the correct TextBox control, like so...
private void textChanged(object sender, EventArgs e)
{
TextBox textBox = sender as TextBox;
if(textBox != null)
{
string theText = textBox.Text;
}
}
Getting the OLD value
For those looking to get the old value, you will need to keep track of that yourself. I would suggest a simple variable that starts out as empty, and changes at the end of each event:
string oldValue = "";
private void textChanged(object sender, EventArgs e)
{
TextBox textBox = sender as TextBox;
if(textBox != null)
{
string theText = textBox.Text;
// Do something with OLD value here.
// Finally, update the old value ready for next time.
oldValue = theText;
}
}
You could create your own TextBox control that inherits from the built-in one, and adds this additional functionality, if you plan to use this a lot.
Have a look at the textbox events such as KeyUp, KeyPress etc. For example:
private void textbox_KeyUp(object sender, KeyEventArgs e)
{
// Do whatever you need.
}
Maybe these can help you achieve what you're looking for.
Even with the older .net fw 2.0 you should still have the new and old value in the eventArgs if not in the textbox.text property itself since the event is fired after and not during the text changing.
If you want to do stuff while the text is being changed then try the KeyUp event rather then the Changed.
private void stIDTextBox_TextChanged(object sender, EventArgs e)
{
if (stIDTextBox.TextLength == 6)
{
studentId = stIDTextBox.Text; // Here studentId is a variable.
// this process is used to read textbox value automatically.
// In this case I can read textbox until the char or digit equal to 6.
}
}
I have a combo box. It must display its content, when focused and its value changed as well.
I wrote this code in its Value Change event:
if(combo1.Focused)
combo1.DroppedDown=true;
But it doesn't work!
what's your solution?
What Event handler are you putting that code in? Assuming that you want to show the drop down when the user types in the edit box part of the combo just handle the TextChanged event and put that code inside there and it should work.
If I understand your requirement correctly, when the combobox gets focus you want the drop down list to show. That can be achieved as follows
private void Form1_Load(object sender, EventArgs e)
{
comboBox1.GotFocus += new EventHandler(comboBox1_GotFocus);
}
void comboBox1_GotFocus(object sender, EventArgs e)
{
comboBox1.DroppedDown = true;
}