当我学习C#/ .NET的复杂性时,请原谅愚蠢的爆发
假设我有三个具有多个静态属性的类(超过三个但是为了参数...)
CLASS FOO
public static A
{
get / set A;
}
public static B
{
get / set B;
}
public static C
{
get / set C;
}
CLASS BAR
{
get / set A;
}
public static B
{
get / set B;
}
public static C
{
get / set C;
}
CLASS YOO
{
get / set A;
}
public static B
{
get / set B;
}
public static C
{
get / set C;
}
从另一个类我需要多次更新每个类中的一个或多个静态属性...如何保持编写多个这样的SWITCH语句......
public void updateVarx(string class, string varx)
{
string y = 'class'
SWITCH (y)
{
case FOO:
FOO.A = Varx;
break;
case BAR:
BAR.A = Varx;
break;
case YOO:
YOO.A = Varx;
break;
}
}
然后另一个当我想要更新B varY时:
public void updateVary(string class, string vary)
{
string y = 'class'
SWITCH (y)
{
case FOO:
FOO.B = Vary;
break;
case BAR:
BAR.B = Vary;
break;
case YOO:
YOO.B = Vary;
break;
}
}
也许我不理解这个问题,但是如果你的所有类都具有相同的属性,那么你可以将对象(FOO,BAR或YOO)传递给UpdateVarx或UpdateVary方法并只实现一个接口?这些方面的东西:
public class FOO : IHasStatus
{
public A
{
get / set A;
}
public B
{
get / set B;
}
public C
{
get / set C;
}
}
public void updateVarx(IHasStatus someObject, string varx)
{
someObject.A = varx;
}
public void updateVary(IHasStatus someObject, string vary)
{
someObject.B = vary;
}
既然你正在学习.net / c#,我想我应该警告你,使用静态属性可能不是面向对象编程的方法。
静态是全球状态并且是危险的。如果你最终使用多线程代码,你必须非常小心。如果你只需要一个实例,只需要实例化一个实例,但不要在类上创建静态属性,除非你有充分的理由添加它们(我现在想不到任何东西)。
实际上,在设计良好的面向对象代码中,你可能不应该有很多if,switch,getter或setter。
假设你的课程需要不同的行为,你可以这样做。
Interface ISecurity {
void UpdateVarX(int value);
void UpdateVarY(int value);
int GetValueX();
int GetValueX();
}
class Foo:ISecurity {
// Implement methods of the interface
}
class Bar:ISecurity {
// Implement methods of the interface
}
class Yoo:ISecurity {
// Implement methods of the interface
}
// This class is the class that uses your other classes
class Consumer
{
private ISecurity sec;
public Consumer(ISecurity sec) {
sec.UpdateVarX(25);
}
}
或者,如果在您的示例中,所有静态类都具有相同的属性:
public class Settings {
public int A {get; set;}
public int B {get; set;}
public int C {get; set;}
}
public class NeedsToUseOtherClass {
public NeedsToUseOtherClass() {
Settings foo = new Settings();
Settings bar = new Settings();
Settings yoo = new Settings();
foo.setA(25);
}
}
如果您不需要具体的类,您可以像这样抽象逻辑:
public class Status {
public string A {
get; set;
}
public string B {
get; set;
}
public string C {
get; set;
}
}
public static class StatusManager {
private static Dictionary<string, Status> statusMap = new Dictionary<string,Status>();
public static Status GetStatus(string name) {
Status status;
if (!statusMap.TryGetValue(name, out status))
statusMap[name] = status = new Status();
return status;
}
public static void SetStatus(string name, Status status) {
statusMap[name] = status;
}
public static void UpdateVarx(string name, string varx) {
GetStatus(name).A = varx;
}
// ...
}
如果你是解决像this这样的多个开关案例的javascript方式的粉丝
你总是可以将开关处理程序包装为Actions并将它们放入Dictionary中。
例如:(来自here的来源)
public class SwitchCase : Dictionary<string,Action>
{
public void Eval(string key)
{
if (this.ContainsKey(key))
this[key]();
else
this["default"]();
}
}
//Now, somewhere else
var mySwitch = new SwitchCase
{
{ "case1", ()=>Console.WriteLine("Case1 is executed") },
{ "case2", ()=>Console.WriteLine("Case2 is executed") },
{ "case3", ()=>Console.WriteLine("Case3 is executed") },
{ "case4", ()=>Console.WriteLine("Case4 is executed") },
{ "default",()=>Console.WriteLine("Default is executed") },
};
mySwitch.Eval(c);
下面的代码使用各种黑客,除非你有充分的理由,否则不会在生产代码中真正推荐。
using System;
using System.Linq;
namespace ConsoleApplication1
{
static class Program
{
private static void SetStaticProperty(string className, string propName, string varx)
{
//This sucks, I couldnt find the namespace with easily through reflection :(
string NAMESPACE = "ConsoleApplication1";
Type t = Type.GetType(NAMESPACE + "." + className);
t.GetProperties().Where(p => p.Name == propName).First().SetValue(null, varx, null);
}
public static void updateVarx(string className, string varx)
{
SetStaticProperty(className, "A", varx);
}
public static void updateVary(string className, string vary)
{
SetStaticProperty(className, "B", vary);
}
static void Main(string[] args)
{
updateVarx("Foo", "FooAstring");
updateVarx("Bar", "BarAstring");
updateVarx("Yod", "YodAstring");
updateVary("Foo", "FooBstring");
updateVary("Bar", "BarBstring");
updateVary("Yod", "YodBstring");
Console.WriteLine(Foo.A);
Console.WriteLine(Foo.B);
Console.WriteLine(Bar.A);
Console.WriteLine(Bar.B);
Console.WriteLine(Yod.A);
Console.WriteLine(Yod.B);
Console.ReadLine();
}
}
class Foo
{
public static string A { get; set; }
public static string B { get; set; }
public static string C { get; set; }
}
class Bar
{
public static string A { get; set; }
public static string B { get; set; }
public static string C { get; set; }
}
class Yod
{
public static string A { get; set; }
public static string B { get; set; }
public static string C { get; set; }
}
}
您可以使用字典作为配置并删除switch语句创建字典并添加如下所示的附加数据以进行映射
//Have dictionary setted up
Dictionary<string, dynamic> m_Dictionary = new Dictionary<string, dynamic>();
m_xmlDictionary.Add("classA",FOO);
m_xmlDictionary.Add("classB",BAR);
m_xmlDictionary.Add("classC",BAR);
//Have dictionary setted up
//change the function as below
public void updatevarx(string class, string varx)
{
m_Dictionary[class].A=varx // Replaced switch statement
}
//while calling use
updatevarx("classC","abc!");// This will assign BAR.A with abc!