Method of Reflection Action Notepad add plugin

This article is mainly about the dynamic acquisition of plug-ins through reflection.

First, all plugins must adhere to the specification, which is an interface defined as follows:

1. Public interface ieditplus / / the interface must be public, otherwise it cannot be referenced externally
2 {
3 string name {get;} / / the name of the plug-in
4 void changestring (textbox TB); / / method to change string
5} 

The interface of the main window

The main idea is to find all of the. dll files under the/debug/lib folder, and manipulate them by means of reflection. (Add Sub-menu under menu edit)

1   private void Form1_Load(object sender, EventArgs e)
2 {
3 / / search / bin / *. DLL
4 / / get the current assembly
5             Assembly ass = Assembly.GetExecutingAssembly();
6             string dirPath = Path.Combine(Path.GetDirectoryName(ass.Location), "lib");
7 string [] filepaths = directory.getfiles (dirpath, "*. DLL"); / / search all DLL files in the folder of the current assembly
8             foreach (var filePath in filePaths)
9             {
10                 Assembly assdll = Assembly.LoadFile(filePath);
11                 Type[] tps = assdll.GetTypes();
12                 foreach (Type tp in tps)
13                 {
14                     if (typeof(IEditPlus).IsAssignableFrom(tp) && !tp.IsAbstract)
15                     {
16 ieditplus EP = (ieditplus) activator. Createinstance (TP); / / get the object and convert it to an interface object
17 toolstripitem TSI = TMS. Dropdownitems. Add (EP. Name); / / load submenu for edit menu
18 tsi.tag = EP; / / save this object as a tag of TSI
19 TSI. Click + = tsi_click; / / add a click event to this sublist
20                     }
21                 }
22             }
23}
24         void tsi_Click(object sender, EventArgs e)
25 {
26 toolstripitem TSI = sender as toolstripitem; / / convert sender display to toolstripitem
27 If (TSI! = null) / / make sure TSI is not null, because sender is an accepted object
28             {
29 / / to operate the changestring method of ieditplus in the event, you need to remove it from the tag
30                 IEditPlus ep = tsi.Tag as IEditPlus;
31                 ep.ChangeString(textBox1);
32             }
Thirty-three
34} 

lowercase to uppercase DLL file code ---Place the generated DLL code under the/debug/lib file of the main program

1 public class lowercase to uppercase: ieditplus
2 {
3         public void ChangeString(System.Windows.Forms.TextBox tb)
4 {
5             tb.Text = tb.Text.ToUpper();
6}
7         public string Name
8 {
9 get {return "lowercase to uppercase";}
10}
11} 

DLL code that changes the font ---Place the generated DLL code under the/debug/lib file of the main program

First add a form, the interface

Add the code for the class:

1 public void ChangeString(System.Windows.Forms.TextBox tb)
2 {
3             FontFm ff = new FontFm(tb);
4             ff.ShowDialog();
5}
6         public string Name
7 {
8 get {return "font";}
9} 

Code for the form:

1  public FontFm()
2 {
3             InitializeComponent();
4}
5         public FontFm(TextBox tb):this()
6 {
7            this._tb = tb;
8}
9 private textbox? TB; / / to operate textbox TB, add fields and constructors
10         private void button1_Click(object sender, EventArgs e)
11 {
12_tb. Font = new font (cbmfont. Text, float. Parse (cbmsize. Text)); / / change font
13 this. Close(); / / close the form
14} 

I think, the reflection and the interface together, the ROD!!!

Method of Reflection Action Notepad add plugin