Winform instance (1)-simple notepad, winform instance notepad

Winform instance (1)-simple notepad, winform instance notepad
Using the time spent learning C #, we made some simple winform forms.

First, let's take one.

Required controls:

1. Two button controls ------ enable and save functions.

2. The corresponding "dialog box" -- openFileDialog and SaveFileDialog controls.

3. A textbox Control is the text content.

3. A timer control prompts the time.

4. A label control with prompt information.

Code implementation: Enable the function:

1 private void btn_open_Click (object sender, EventArgs e) 2 {3 if (openFileDialog1.ShowDialog () = DialogResult. OK) 4 {5 FileName = openFileDialog1.FileName; 6 7 try 8 {9 OriginalContent = File. readAllText (FileName); 10 textBox1.Text = OriginalContent; 11} 12 catch 13 {14 15 lbl_notice.Text = "the file cannot be opened! "; 16} 17} 18}

 

Save:

You have written a method to save and disable it.

1 private void save () 2 {3 // when the content has changed, this flag is True 4 bool ShouldSvae = false; 5 // if the file name is not empty, indicates that the content in the current text box is from file 6 if (FileName! = "") 7 {8 // if the content changes 9 if (textBox1.Text! = OriginalContent & MessageBox. Show ("the file has been modified. Are you sure you want to save it? "," Save file ", MessageBoxButtons. yesNo) = DialogResult. yes) 10 {11 ShouldSvae = true; 12} 13} 14 else15 {16 // if the user inputs the content, a file name 17 if (textBox1.Text! = "" & SaveFileDialog1.ShowDialog () = DialogResult. OK) 18 {19 FileName = saveFileDialog1.FileName; 20 ShouldSvae = true; 21} 22} 23 if (ShouldSvae) 24 {25 try26 {27 File. writeAllText (FileName, textBox1.Text); 28 OriginalContent = textBox1.Text; 29 lbl_notice.Text = "saved files"; 30} 31 catch (Exception) 32 {33 lbl_notice.Text = "failed to save the file !! "; 34 throw; 35} 36} 37}

 

Close the window and save:

The FormClosing event of the form is used.

1 // when the window is closed, save the file 2 private void form=formclosing (object sender, FormClosingEventArgs e) 3 {4 save (); 5}

 

Textbox Control details:

(1) set the multiline attribute;

(2) Side Pull box: Scrollbars attributes;

Timer control:

1 private void timer1_Tick(object sender, EventArgs e)2         {3             lblTimer.Text = DateTime.Now.ToString();4         }

Window title:

Display the file name in the window title.

1 // form initial value 2 private void Form1_Load (object sender, EventArgs e) 3 {4 lblTimer. text = ""; 5 lbl_notice.Text = ""; 6 Text = "untitled-my notepad"; 7 8} 9 // The Form title displays the file name 10 private string OriginalContent; 11 12 private string _ FileName = ""; 13 14 public string FileName15 {16 get {return _ FileName ;} 17 18 set 19 {20 // update the Form title 21 _ FileName = value; 22 // use System. IO reference 23 Text = Path. getFileName (value) + "-My Notepad"; 24 25} 26}

 

All code:

1 using System; 2 using System. collections. generic; 3 using System. componentModel; 4 using System. data; 5 using System. drawing; 6 using System. IO; 7 using System. linq; 8 using System. text; 9 using System. threading. tasks; 10 using System. windows. forms; 11 12 namespace Notepad 13 {14 public partial class Form1: Form 15 {16 public Form1 () 17 {18 InitializeComponent (); 19 20} 21 22 23 private void Timereffectick (object sender, EventArgs e) 24 {25 lblTimer. text = DateTime. now. toString (); 26} 27 28 // initial form value 29 private void Form1_Load (object sender, EventArgs e) 30 {31 lblTimer. text = ""; 32 lbl_notice.Text = ""; 33 Text = "untitled-my notepad"; 34 35} 36 // format title display file name 37 private string OriginalContent; 38 39 private string _ FileName = ""; 40 41 public string FileName 42 {43 get {return _ FileName;} 44 45 set 46 {47 // Update Form title 48 _ FileName = value; 49 // use System. IO references 50 Text = Path. getFileName (value) + "-My Notepad"; 51 52} 53} 54 55 private void btn_open_Click (object sender, EventArgs e) 56 {57 if (openFileDialog1.ShowDialog () = DialogResult. OK) 58 {59 FileName = openFileDialog1.FileName; 60 61 try 62 {63 OriginalContent = File. readAllText (FileName); 64 textBox1.Text = OriginalContent; 65} 6 6 catch 67 {68 69 lbl_notice.Text = "the file cannot be opened! "; 70} 71} 72} 73 74 private void btn_save_Click (object sender, EventArgs e) 75 {76 save (); 77} 78 79 private void save () 80 {81 // when the content has changed, this flag is True 82 bool ShouldSvae = false; 83 // if the file name is not empty, indicates that the content in the current text box is from the file 84 if (FileName! = "") 85 {86 // if the content is changed 87 if (textBox1.Text! = OriginalContent & MessageBox. Show ("the file has been modified. Are you sure you want to save it? "," Save file ", MessageBoxButtons. yesNo) = DialogResult. yes) 88 {89 ShouldSvae = true; 90} 91} 92 else 93 {94 // if the user inputs the content, a file named 95 if (textBox1.Text! = "" & SaveFileDialog1.ShowDialog () = DialogResult. OK) 96 {97 FileName = saveFileDialog1.FileName; 98 ShouldSvae = true; 99} 100} 101 if (ShouldSvae) 102 {103 try104 {105 File. writeAllText (FileName, textBox1.Text); 106 OriginalContent = textBox1.Text; 107 lbl_notice.Text = "saved file"; 108} 109 catch (Exception) 110 {111 lbl_notice.Text = "failed to save the file !! "; 112 throw; 113} 114} 115} 116 // when the window is closed, save the file 117 private void form=formclosing (object sender, FormClosingEventArgs e) 118 {119 save (); 120} 121 122} 123}

View Code

 

 

Finally:

Through the exercises of the winform instance, you can customize the functions you want.