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const 编译时常量
static readonly 运行时常量
直接上代码
1.新建一个类库BLL->添加类Teacher
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6 7 namespace BLL 8 { 9 public class Teacher 10 { 11 public static readonly int i = 3; 12 public static readonly string j = "static"; 13 14 public const int m = 6; 15 public const string n = "const"; 16 } 17 }
2.新建空Web应用程序->添加Webform
/*页面HTML*/
1 <html xmlns="http://www.w3.org/1999/xhtml"> 2 <head runat="server"> 3 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 4 <title></title> 5 </head> 6 <body> 7 <form id="form1" runat="server"> 8 <div> 9 <asp:TextBox ID="txti" runat="server"></asp:TextBox> 10 <asp:TextBox ID="txtj" runat="server"></asp:TextBox> 11 <asp:TextBox ID="txtm" runat="server"></asp:TextBox> 12 <asp:TextBox ID="txtn" runat="server"></asp:TextBox> 13 </div> 14 </form> 15 </body> 16 </html>
/*后台代码*/
1 namespace WebApplication1 2 { 3 public partial class WebForm1 : System.Web.UI.Page 4 { 5 protected void Page_Load(object sender, EventArgs e) 6 { 7 Teacher t = new Teacher(); 8 this.txti.Text=Teacher.i.ToString(); 9 this.txtj.Text=Teacher.j.ToString(); 10 this.txtm.Text = Teacher.m.ToString(); 11 this.txtn.Text = Teacher.n.ToString(); 12 } 13 } 14 }
3.在IIS发布访问后(页面显示)
4.修改Teacher类中常量值
namespace BLL { public class Teacher { public static readonly int i = 5; public static readonly string j = "static_modify"; public const int m = 9; public const string n = "const_modify"; } }
5.生成解决方案,替换发布包中的BLL.dll后访问页面结果发现
static变量修改成功了,而const变量修改失败...
结论 :const 会将值便已在代码中,而static只是保留了引用
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原文地址：http://www.cnblogs.com/sakuya-GD/p/4619338.html
