I'm very new at this and I am attempting to take text from a .txt file and input it into a text box.
I have tried to read text from a file that has been located on my computer
private void textBox1_TextChanged(object sender, EventArgs e)
{
textBox1.Text = (File.ReadAllText("F:\\Example"));
}
I need textBox1 to display the text that is in "F:\Example"
This example adds a handler to the form's OnLoad event:
using System;
using System.IO;
using System.Windows.Forms;
namespace WindowsFormsApp1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
this.textBox1.Text = File.ReadAllText(#"F:\Example");
}
}
}
As #John said, if you want to display a text after form load you can use Form.Load event directly or you can override it like so:
protected override void OnLoad(EventArgs e)
{
base.OnLoad(e);
textBox1.Text = File.ReadAllText("F:\\Example");
}
You can also load text by button click.
if you use Form_Load then you should read the file asynchronously because any file loading time will freeze your form from being displayed.
For instance, if your file takes 5 seconds to load then the form will not be visible for 5 seconds.
Here's an example that uses Task.Run to load the data asynchronously then display it. If first shows the form with message "Loading data...", then the text box is updated once the data has been loaded.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
this.textBox1.Text = "Loading data...";
LoadData();
}
private async void LoadData()
{
string text = null;
await Task.Run(() =>
{
text = File.ReadAllText("z:\\very_large_file.txt");
});
this.textBox1.Text = text;
}
}
There are of course many other ways to load a file asynchronously (e.g. using streams) but I think this sample code is easier to understand.
Hope this helps :)
Related
I have an application with three forms. MainForm, QuestionForm, and ViewItemsForm. The MainForm is always displayed. The MainForm contains two buttons and two read-only textboxes. One of the buttons allows the user to open up multiple instance of the QuestionForm which should then display the count of how many are open in one of the textboxes in the MainForm. If one of the QuestionForms is closed, the count inside the textbox should go down to.
I've tried to implement the trigger inside the button that opens the QuestionFrom, and another when the form is closed, but it doesn't seem to work.
public partial class Form1 : Form
{
private void questionFormButton_Click(object sender, EventArgs e)
{
QuestionForm questionFormOpen = new QuestionForm();
questionFormOpen.Show();
}
private void countOfQuestionForm_TextChanged(object sender, EventArgs e)
{
countOfQuestionForm.Text = //Assign the count here
}
}
You can use the Application.OpenForms Property like the following code:
private void questionFormButton_Click(object sender, EventArgs e)
{
QuestionForm questionFormOpen = new QuestionForm();
questionFormOpen.Show();
questionFormOpen.Shown += Fr_Closed;
questionFormOpen.Disposed += Fr_Closed;
}
private void Fr_Closed(object sender, EventArgs e)
{
countOfQuestionForm.Text = Application.OpenForms.OfType<QuestionForm>().Count().ToString();
}
So here is my setup so you can better understand what I am trying to do. I have the following:
Windows Form 1 (Toolbox) with a textbox for the Google Search and a Search Click button that loads the secondary Windows Form (Search Engine). I am wanting to do the following.
Type the search criteria in my text box and clicking on the Search button which will open the secondary Windows Form (Search Engine) which will load the google search on the (Search Engine) form using "WebBrowser1"
Any assistance would be greatly appreciated. If you can provide code instead of where to go that would be best :)
Updated Code: Which opens the Google Search Engine but does not display on the Webbrowser1. Any additional assistance would be appreciated
Form 1 Search button click Code:
namespace Plumchoice_Toolbox
{
public partial class plumchoice_Form1 : Form
{
public plumchoice_Form1()
{
InitializeComponent();
}
private void plumchoice_Form1_Load(object sender, EventArgs e)
{
}
//Search Engine Form 1 added
//// Search Button that opens the Search Engine
private void button18_Click(object sender, EventArgs e)
{
Google_Search.SearchEngineForm1 frm2 = new Google_Search.SearchEngineForm1();
frm2.searchAddress = "http://www.google.com/webhp?hl=en&tab=ww#hl=en&tbo=d&output=search&sclient=psy-ab&q=" + textBox3.Text.Replace(" ", "+");
frm2.Show();
}
Webbrowser1 Code
namespace Google_Search
{
public partial class SearchEngineForm1 : Form
{
public SearchEngineForm1()
{
InitializeComponent();
}
public string searchAddress;
private void PlumChoiceToolboxForm1_Load(object sender, EventArgs e)
{
webBrowser1.Url = new Uri(searchAddress);
}
You can do this: In form1 search button click
This code is for Form1 that has a search text box and a button for start searching. I think (but not sure) it is same as your Toolbox form.
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void Search_Click(object sender, EventArgs e)//When user clicks on search button
{
SearchEngineForm1 frm2 = new SearchEngineForm1();
frm2.searchAddress = "https://www.google.com/search?q=" + txtSearch.Text.Replace(" ", "+");
frm2.Show();
}
}
And below is the Form2 or SearchEngineForm1 that will open after search button click.
public partial class SearchEngineForm1 : Form
{
public SearchEngineForm1()
{
InitializeComponent();
}
public string searchAddress;
private void SearchEngineForm1_Load(object sender, EventArgs e)
{
webBrowser1.Url= new Uri(searchAddress);
}
}
In your code you have a mistake:
private void PlumChoiceToolboxForm1_Load(object sender, EventArgs e)
{
webBrowser1.Url = new Uri(searchAddress);
}
What is this void? This will never fire. You need to double click on SearchEngineForm1 form (a blank space on form) to add this void to your code:
private void SearchEngineForm1_Load(object sender, EventArgs e)
{
}
Do not forget double click i said. Pasting this only does not help you!
then enter the webBrowser1.Url= new Uri(searchAddress); between its braces {} to have this exactly:
private void SearchEngineForm1_Load(object sender, EventArgs e)
{
webBrowser1.Url= new Uri(searchAddress);
}
I can't write in richTextBox or the textBox , whenever I start to write something it freezes my program. Any idea what it is ? I haven't changed anything in code or properties of the textBox.
using System.Text;
using System.Windows.Forms;
using System.IO;
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void saveToolStripMenuItem_Click(object sender, EventArgs e)
{
File.WriteAllText("TextFile1.txt", richTextBox1.Text);
}
private void richTextBox1_TextChanged(object sender, EventArgs e)
{
richTextBox1.LoadFile ("TextFile1.txt");
}
}
It looks like you are loading a file into the text box that you are writing in:
So get rid of this piece of code:
private void richTextBox1_TextChanged(object sender, EventArgs e)
{
richTextBox1.LoadFile ("TextFile1.txt");
}
Try moving it into the OnLoad method of the form (assuming you want the text box populated when the form opens):
protected override void OnLoad(EventArgs e) {
base.OnLoad(e);
richTextBox1.LoadFile ("TextFile1.txt");
}
The RichTextBox also has a SaveFile method. It's not clear from your code if the "rich" text is important to the application.
bool _isLoading = false;
private void richTextBox1_TextChanged(object sender, EventArgs e)
{
if(_isLoading) return;
_isLoading = true;
richTextBox1.LoadFile ("TextFile1.txt");
_isLoading = false;
}
I'm looking to create a very simple program that's only function is to display my website. So basically the program would be like an iframe of the website. What is the best way to achieve this?
You can't use iFrame since it is a browser technology. You must use a web browser as follows, I believe:
using System;
using System.Windows.Forms;
namespace WindowsFormsApplication10
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
// When the form loads, open this web page.
webBrowser1.Navigate("http://www.dotnetperls.com/");
}
private void webBrowser1_Navigating(object sender, WebBrowserNavigatingEventArgs e)
{
// While the page has not yet loaded, set the text.
this.Text = "Navigating";
}
private void webBrowser1_DocumentCompleted(object sender,
WebBrowserDocumentCompletedEventArgs e)
{
// Better use the e parameter to get the url.
// ... This makes the method more generic and reusable.
this.Text = e.Url.ToString() + " loaded";
}
}
}
Ref. http://www.dotnetperls.com/webbrowser
Note: Example is in C#.
Check this out for C++ What embedded browser for C++ project?
I am making a Time clock for fun and to learn C#.
I have the time down, and the start, stop, clear.
However I am having issues with a "Notes" section. Ideally I'd like to be able to write notes into a field, and have an "Edit" button to allow the user to open a window for more options relating to text editing. (with the text from the Form1 rich text box)
My issue comes from copying the data from one form to another.
Here is the code:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace PunchOut
{
public partial class PunchOut : Form
{
public PunchOut()
{
InitializeComponent();
}
int i = 0;
private void button3_Click(object sender, EventArgs e)
{
timer1.Enabled = true;
i++;
TimeSpan t = TimeSpan.FromSeconds(i);
textBox2.Text = string.Format("{0:D2}:{1:D2}:{2:D2}",
t.Hours,
t.Minutes,
t.Seconds);
}
private void button2_Click(object sender, EventArgs e)
{
timer1.Enabled = false;
}
private void button1_Click(object sender, EventArgs e)
{
textBox2.Clear();
textBox2.Text = ("00:00:00").ToString();
}
private void button6_Click(object sender, EventArgs e)
{
}
public void button4_Click(object sender, EventArgs e)
{
new Form2().Show();
richTextBox1.Text = Form2.richTextBox1.Text;
}
}
}
Here is the Form2 code:
namespace PunchOut
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
public void richTextBox1_TextChanged(object sender, EventArgs e)
{
richTextBox1.Text = PunchOut.richTextBox1.Text;
}
}
}
Currently, I get an error that states:
an object reference is required for the non-static field, method, or property 'PunchOut.PunchOut.richTextBox1'
and
an object reference is required for the non-static field, method, or property 'PunchOut.Form2.richTextBox1'
Why do I get these errors?
lots of unneeded work going on there. I hope I explained this well enough
Breakdown:
We add a String Member Variable so that we can put the contents of a RichTextBox into a string and pass that instead of using the RichTextbox control.
We change the constructor to take a string parameter which is the RTF text that you want to change. Now Form2 can change any RTF text and not be specifically tied to just the richTextbox1 on the punchoutForm.
We then change the updating of the member variable to when the form is closing otherwise you are changing it with each keystroke which is a lot of unnecessary method calls.
namespace PunchOut
{
public partial class Form2 : Form
{
public String richText;
public Form2(String rText)
{
InitializeComponent();
this.richTextBox1.Rtf = rText;
}
private void Form2_FormClosing(object sender, FormClosingEventArgs e)
{
richText = this.richTextBox1.Rtf;
}
}
}
Then in your button4_Click. Use Rtf to include the codes otherwise just use a plain textbox
Now in your button click event handler we create a new form and assign it to a variable. We then call showdialog. The reason for showdialog is that this will make the form the top most form so that a user cannot go back to the punchout form and make a change to the richtextbox which would then make the text in the Form2 obsolete as it would no longer represent the correct RTF text in the punchout form. When the user is done editing the text and closes the form we then request the edited rtf text by accessing the richText Member Variable of Form2. The reason you can access this after the form has closed is that the form is not disposed until the method returns, your local variable lives within the scope of the method.
public void button4_Click(object sender, EventArgs e)
{
Form2 f2 = new Form2(richTextBox1.Rtf);
f2.ShowDialog();
richTextBox1.Rtf= f2.richText;
}
You didn't make a new reference to PunchOut in Form2. In your form 2 add this under the class declaration:
PunchOut punchOut;
And you get in Form2:
namespace PunchOut
{
public partial class Form2 : Form
{
PunchOut punchOut;
public Form2(PunchOut PUNCHOUT)
{
punchOut = PUNCHOUT;
InitializeComponent();
}
public void richTextBox1_TextChanged(object sender, EventArgs e)
{
richTextBox1.Text = punchOut.richTextBox1.Text;
}
}
}
In the original replace button4_CLick with:
public void button4_Click(object sender, EventArgs e)
{
Form2 form2 = new Form2(this);
form2.Show();
richTextBox1.Text = form2.richTextBox1.Text;
}
EDITED: You should pass the old PunchOut instead of creating a new one. I've updated the code.
You could store the text in a more accessible string. Then have your other form call that string.
public string yourText;
// down further
yourText = textBox1.Text;