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On the difference between const and static readonly in C #

Source: Internet
Author: User
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Const compile-time constants

Static readonly run-time constant

Directly on the code

1. Create a new Class library bll-> Add Class teacher

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Linq;4 usingSystem.Text;5 usingSystem.Threading.Tasks;6 7 namespaceBLL8 {9     Public  classTeacherTen     { One          Public Static ReadOnly inti =3; A          Public Static ReadOnly stringj ="Static"; -  -          Public Const intm =6; the          Public Const stringn ="Const"; -     } -}
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2. Create a new empty Web application, add WebForm

/* Page html*/

1"http://www.w3.org/1999/xhtml">2"Server">3<meta http-equiv="Content-type"Content="text/html; Charset=utf-8"/>4<title></title>56<body>7<form id="Form1"runat="Server">8<div>9<asp:textbox id="Txti"runat="Server"></asp:TextBox>Ten<asp:textbox id="TXTJ"runat="Server"></asp:TextBox> One<asp:textbox id="Txtm"runat="Server"></asp:TextBox> A<asp:textbox id="Txtn"runat="Server"></asp:TextBox> -</div> -</form> the</body> -View Code
/* Background Code */
1 namespaceWebApplication12 {3      Public Partial classWebForm1:System.Web.UI.Page4     {5         protected voidPage_Load (Objectsender, EventArgs e)6         {7Teacher T =NewTeacher ();8              This. Txti. text=teacher.i.tostring ();9              This. Txtj. text=teacher.j.tostring ();Ten              This. Txtm. Text =teacher.m.tostring (); One              This. Txtn. Text =teacher.n.tostring (); A         } -     } -}
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3. After the IIS publishing access (page display)
4. Modifying constant values in the teacher class
namespacebll{ Public  classTeacher { Public Static ReadOnly inti =5;  Public Static ReadOnly stringj ="static_modify";  Public Const intm =9;  Public Const stringn ="const_modify"; }}
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5. Build the solution, replace the BLL.dll in the publish package after accessing the page results found
The static variable modification succeeded, and the const variable modification failed ...
Conclusion: const will have the value in the code, and static just keeps the reference
 On the difference between const and static readonly in C #

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