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用常量文本初始化arraylist

.net-micro-framework .net c#

MandoMando · 技术社区 · 16 年前

是否可以直接初始化下面的arraylist,而不需要使用afileext字符串数组?

private static string[] aFileExt = 
     {"css", "gif", "htm", "html", "txt", "xml" };
private System.Collections.ArrayList alFileTypes =
     new System.Collections.ArrayList(aFileExt);

下面的行是目标,但我的.NET编译器不喜欢它:

private static System.Collections.ArrayList alFileTypes = 
     new System.Collections.ArrayList({"css","gif","htm","html","txt","xml"});

我正在使用.NET Micro框架,因此无法访问泛型类型。

6 回复 | 直到 13 年前

Jon Skeet 16 年前

C 1或2:

private static ArrayList alFileTypes = 
     new ArrayList(new string[] {"css","gif","htm","html","txt","xml"});

C 3使用隐式类型数组:

private static ArrayList alFileTypes = 
    new ArrayList(new[] {"css","gif","htm","html","txt","xml"});

C 3使用集合初始值设定项:

private static ArrayList alFileTypes = 
    new ArrayList{"css","gif","htm","html","txt","xml"};

或者创建自己的助手方法:

public static ArrayList CreateList(params object[] items)
{
    return new ArrayList(items);
}

然后:

static ArrayList alFileTypes = CreateList("css","gif","htm","html","txt","xml");

你为什么不使用通用集合,有什么理由吗?

Adam Robinson 16 年前

如果您使用的是.NET 2.0或更高版本,则应该使用通用的 List<T> 类型(即使是 List<object> ,这将为您提供与 ArrayList )

如果您使用的是.NET 3.5或更高版本,则可以使用以下语法:

private static List<string> fileTypes = new List<string>()
{ 
    "css","gif","htm","html","txt","xml" 
};

不管怎样,如果你想坚持 阵列列表 ,您只需执行以下操作:

private static System.Collections.ArrayList alFileTypes = 
 new System.Collections.ArrayList(new object[] {"css","gif","htm","html","txt","xml"});

Thomas Levesque 13 年前

C 3.0与通用 List<T> ,而不是 ArrayList :

private static List<string> alFileTypes =
    new List<string> {"css","gif","htm","html","txt","xml"};

Sean Bright Sean Stinehour 16 年前

private static System.Collections.ArrayList alFileTypes = 
 new System.Collections.ArrayList(new string [] {"css","gif","htm","html","txt","xml"});

TLiebe 16 年前

尝试

private static System.Collections.ArrayList alFileTypes =   new System.Collections.ArrayList(){"css","gif","htm","html","txt","xml"};

kemiller2002 16 年前

是的,换一下就行了

private static System.Collections.ArrayList alFileTypes = 
     new System.Collections.ArrayList({"css","gif","htm","html","txt","xml"});

到

private static System.Collections.ArrayList alFileTypes = 
     new System.Collections.ArrayList(new string[] {"css","gif","htm","html","txt","xml"});