C # notepad V2.0

On the basis of notepad V1.0, added the cut, assignment, paste, and delete functions in editing, and made some changes to the processing before the program is closed.

 

Newly Added code:

// Operation of the system clipboard
Private void copy toolstripmenuitem_click (Object sender, eventargs E)
{
If (this. textbox1.selectedtext! = "")
{
Clipboard. setdataobject (this. textbox1.selectedtext );
}
Else
MessageBox. Show ("No selected text! ");
}

Private void pasting toolstripmenuitem_click (Object sender, eventargs E)
{
Idataobject idata = clipboard. getdataobject ();

// Check whether the data is in the available format, that is, the text format.
If (idata. getdatapresent (dataformats. Text ))
{
If (this. textbox1.selectedtext! = "")
{
Textbox1.selectedtext = (string) idata. getdata (dataformats. Text );
}
Else
{
Textbox1.text + = (string) idata. getdata (dataformats. Text );
}
}
Else
{
MessageBox. Show ("No data is received from the clipboard! ");
}
}

Private void Delete toolstripmenuitem_click (Object sender, eventargs E)
{
This. textbox1.selectedtext = "";
}

Private void cut xtoolstripmenuitem_click (Object sender, eventargs E)
{
If (this. textbox1.selectedtext! = "")
{
Clipboard. setdataobject (this. textbox1.selectedtext );
This. textbox1.selectedtext = "";
}
Else
MessageBox. Show ("No selected text! ");

}

 

Modified code:

// Check whether the file is saved before closing
Private void mynotepad_formclosing (Object sender, formclosingeventargs E)
{
If (this. textbox1.text! = "")
{
If (! File. exists (this. Text ))
{
Dialogresult d = MessageBox. Show (the text of "file" + this. Text + @ "has changed.
Do you want to save the file? "," Mynotepad ", messageboxbuttons. yesnocancel, messageboxicon. Information, messageboxdefaultbutton. button1, messageboxoptions. defaulttoptoponly );
Switch (d)
{
Case dialogresult. Yes:
Using (savefiledialog savedig = new savefiledialog ())
{
Savedig. Filter = @ "Text Document (*. txt) | *. txt ";
Savedig. filename = "*. txt ";
If (savedig. showdialog () = dialogresult. OK)
{
Streamwriter Sw = new streamwriter (savedig. filename, false, system. Text. encoding. Default );
Sw. Write (this. textbox1.text );
Sw. Close ();
This. Text = savedig. filename;
}
}
Break;
Case dialogresult. No:
Break;
Case dialogresult. Cancel:
Break;

Default: system. Diagnostics. Debug. Assert (false );
Break;
}
}
}
}