搞了个枚举,枚举类型定义了一组符号和数值对,每个枚举类型都直接继承于system.enum.而system.enum又继承于system.valuetype,因此枚举类型是值类型,枚举类型week 定义了一个星期7天.
1
using System;
2using System.Data;
3using System.Configuration;
4using System.Web;
5using System.Web.Security;
6using System.Web.UI;
7using System.Web.UI.WebControls;
8using System.Web.UI.WebControls.WebParts;
9using System.Web.UI.HtmlControls;
10
11public partial class _Default : System.Web.UI.Page
12
{
13
protected void Page_Load(object sender, EventArgs e)
14
{
15 if (!IsPostBack)
16 {
17 TestEnum();
18 Week weekDay = (Week)100;
19 ValiateEnum(weekDay);
20 Response.End();
21
}
22
23 }
24
25//定义星期的枚举
26 public enum Week
27 {
28 Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday
29 }
30 private void TestEnum()
31 {
32 Week[] weekList = (Week[])Enum.GetValues(typeof(Week));
33 foreach (Week w in weekList)
34 {
35 Response.Write(w.ToString("D") + "\t" + w.ToString("G") + "<br>");
36 }
37 string[] nameList = Enum.GetNames(typeof(Week));
38 foreach (string s in nameList)
39 { Response.Write(s + "<br>"); }
40 Response.Write(Enum.GetName(typeof(Week),3)+"<br>");
41 Response.Write(Enum.GetName(typeof(Week),Week.Wednesday)+ "<br>");
42 //Response.Write("Base class is "+Enum.GetUnderlyingType(typeof(Week)+"<br>"));
43 //不知道错哪了,不注释掉不让调试
.
44 }
45 private void ValiateEnum(Week w)
46 {
47 if (Enum.IsDefined(typeof(Week), w) == false)
48 {
49 Response.Write(w.ToString() + "Is not exist.<br>");
50 }
51 else
52 {
53 Response.Write(w.ToString() + "\t Is exist.<br>");
54 }
55 }
56
}
57
58
using System;2
using System.Data;3
using System.Configuration;4
using System.Web;5
using System.Web.Security;6
using System.Web.UI;7
using System.Web.UI.WebControls;8
using System.Web.UI.WebControls.WebParts;9
using System.Web.UI.HtmlControls;10
11
public partial class _Default : System.Web.UI.Page 12
{
13
protected void Page_Load(object sender, EventArgs e)14
{
15
if (!IsPostBack)16
{17
TestEnum();18
Week weekDay = (Week)100;19
ValiateEnum(weekDay);20
Response.End();21
}22
23
}24
25
//定义星期的枚举26
public enum Week27
{28
Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday29
}30
private void TestEnum()31
{32
Week[] weekList = (Week[])Enum.GetValues(typeof(Week));33
foreach (Week w in weekList)34
{35
Response.Write(w.ToString("D") + "\t" + w.ToString("G") + "<br>");36
}37
string[] nameList = Enum.GetNames(typeof(Week));38
foreach (string s in nameList)39
{ Response.Write(s + "<br>"); }40
Response.Write(Enum.GetName(typeof(Week),3)+"<br>");41
Response.Write(Enum.GetName(typeof(Week),Week.Wednesday)+ "<br>");42
//Response.Write("Base class is "+Enum.GetUnderlyingType(typeof(Week)+"<br>"));43
//不知道错哪了,不注释掉不让调试.44
}45
private void ValiateEnum(Week w)46
{47
if (Enum.IsDefined(typeof(Week), w) == false)48
{49
Response.Write(w.ToString() + "Is not exist.<br>");50
}51
else52
{53
Response.Write(w.ToString() + "\t Is exist.<br>");54
}55
}56
}57
58
问题就出现了,其中有个GetValue和 GetValues,虽然就多了一个S ,但区别很大的.
还有一个GetName和 GetNames,也不一样,GetName是指定枚举中检索具有指定值的常数的名称;
GetNames是指检索指定枚举中常数名称的数组;
还有上面 Response.Write(w.ToString("D") + "\t" + w.ToString("G") + "<br>");里面的Ｄ和Ｇ是什么意思？