The production of C # Notepad

I. Implementation of MENU commands

Textbox:
Property:
Text: Literal
SelectedText: Gets or sets the selected text
CanUndo: Is it possible to revoke
Method:
Undo: Undo
Clearundo: emptying the undo buffer
Cut: Cut
Copy: Copying
Paste: Pasting
SelectAll: Select All
dialog box:
ShowDialog (); Displays a dialog box that returns an enumeration type of DialogResult

Colordialog:color property, used to get the color
Folderbrowserdialog:selectedpath Selected Path
The Fontdialog:font property returns a font type value that stores the settings for the font
OpenFileDialog:
FileName Gets or sets the file path that contains the filename
Filenames is an array of file path strings
Filter: File filter format is hint text one |*. suffix | hint text two |*. suffix | hint text three |*. suffix
SAVEFILEDIALOG1:
FileName Gets or sets the file path that contains the filename
Filenames is an array of file path strings
Filter: File filter format is hint text one |*. suffix | hint text two |*. suffix | hint text three |*. suffix

Notepad production:

1. Make a good menu bar with MenuStrip;

2. Set the text box to multiline and set the dock to fill;

3. Set the events for the Edit menu command;

4. Set the event for the "File" menu command;

Note: When setting up a command that requires a popup window, drag the appropriate window tool to the design form in advance, and drag it in the lower part of the form to see the following:

trigger events for individual menu commandsPrivate voidRevoke Toolstripmenuitem_click (Objectsender, EventArgs e) {            if(Textbox1.canundo) {Textbox1.undo (); }        }        Private voidClip Toolstripmenuitem_click (Objectsender, EventArgs e) {            if(Textbox1.selectedtext! =NULL) {textbox1.cut (); }        }        Private voidCopy Toolstripmenuitem_click (Objectsender, EventArgs e) {            if(Textbox1.selectedtext! =NULL) {textbox1.copy (); }        }        Private voidPaste Toolstripmenuitem_click (Objectsender, EventArgs e)        {Textbox1.paste (); }        Private voidDelete Toolstripmenuitem_click (Objectsender, EventArgs e) {            if(Textbox1.selectedtext! =NULL) {Textbox1.selectedtext=""; }        }//to set the event for a File menu command that pops up a dialog box        Private voidFont Toolstripmenuitem_click (Objectsender, EventArgs e) {Fontdialog1.showdialog ();//Display Font dialog box            if(Fontdialog1.font! =NULL)//If the user selects a font, the font size is displayed{MessageBox.Show (fontDialog1.Font.Size.ToString ());} }        Private voidOpen Toolstripmenuitem_click (Objectsender, EventArgs e)        {Openfiledialog1.showdialog (); }        Private voidSave Toolstripmenuitem_click (Objectsender, EventArgs e)            {Savefiledialog1.showdialog (); if(Savefiledialog1.filename! =NULL) {MessageBox.Show (savefiledialog1.filename); }        }

After you press the Font command

Second, read and write data through file stream

Required namespaces: using System. IO;

Flow:
Input stream:
string filename = Openfiledialog1.filename;
Read through the stream for file reading
StreamReader sr = new StreamReader (filename);
TextBox1.Text = Sr. ReadToEnd ();
Sr. Close ();
Output stream:
string filename = Savefiledialog1.filename;
Write a stream, you can create a file on the hard disk, and write information to the file
StreamWriter SW = new StreamWriter (filename);
Sw. Write (This.textBox1.Text);
Sw. Close ();
This: Represents the current object of the class in which it resides

Exercises for input streams:

Private voidOpen Toolstripmenuitem_click (Objectsender, EventArgs e)            {Openfiledialog1.showdialog (); if(Openfiledialog1.filename! =NULL)//If the user selects a file, the text that is read into the file            {                stringOpenFileName =Openfiledialog1.filename; StreamReader SR=NewStreamReader (OPENFILENAME);//Create a file stream object with the filename as a parametertextbox1.text= Sr. ReadToEnd ();//Transfer the text you read to a text boxSr.close ();//Remember to close the file stream when you're done            }                     }

Find the Aaa.txt on the desktop, click Open, you can see the text box has text

Print:
Print dialog box: PrintDialog
Page Setup: PageSetupDialog
Both dialog boxes need to be set PrintDocument to specify the print object
PrintDocument: Print objects, must have, a piece of artboard, for the printer and print content between the transfer, the printer is printed printdoment
Printdocument1_printpage: event, triggered before each page printed, used to specify print content for PrintDocument
Draw the content onto the page of the printed object through the artboard:
System.Drawing.Font f = new System.Drawing.Font ("Arial", 12);
E.graphics.drawstring (textbox1.text,f,system.drawing.brushes.aqua,5,5);
Last Print: Print dialog box, if the print dialog returns to confirm printing, execute printdocument.print ();

Tip: ctrl+e+d automatic alignment;
After the function name, enter a "(" or the cursor in () press ctrl+shift+ space, you can view the overloaded content.

Use function considerations: whether the content to invoke is determined to exist;
Under what conditions need to call;

The production of C # Notepad