C# 使用常量文字初始化 ArrayList
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Initializing ArrayList with constant literal
提问by MandoMando
Can the ArrayList below be initialized directly without the need for aFileExt string array?
下面的ArrayList可以直接初始化而不需要aFileExt字符串数组吗？
private static string[] aFileExt =
{"css", "gif", "htm", "html", "txt", "xml" };
private System.Collections.ArrayList alFileTypes =
new System.Collections.ArrayList(aFileExt);
The line below is the goal, but my .Net Compiler does not like it:
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"});
I am using the .net Micro Framework and thus do not have access to generic types.
我使用的是 .net Micro Framework，因此无法访问泛型类型。
采纳答案by Jon Skeet
C# 1 or 2:
C# 1 或 2：
private static ArrayList alFileTypes =
new ArrayList(new string[] {"css","gif","htm","html","txt","xml"});
C# 3 using an implicitly typed array:
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 using a collection initializer:
C# 3 使用集合初始值设定项：
private static ArrayList alFileTypes =
new ArrayList{"css","gif","htm","html","txt","xml"};
Or create your own helper method:
或者创建你自己的辅助方法：
public static ArrayList CreateList(params object[] items)
{
return new ArrayList(items);
}
then:
然后：
static ArrayList alFileTypes = CreateList("css","gif","htm","html","txt","xml");
Any reason why you're not using the generic collections, btw?
你有什么理由不使用泛型集合，顺便说一句？
回答by Sean Bright
private static System.Collections.ArrayList alFileTypes =
new System.Collections.ArrayList(new string [] {"css","gif","htm","html","txt","xml"});
回答by kemiller2002
yes, just change
是的，只是改变
private static System.Collections.ArrayList alFileTypes =
new System.Collections.ArrayList({"css","gif","htm","html","txt","xml"});
to
到
private static System.Collections.ArrayList alFileTypes =
new System.Collections.ArrayList(new string[] {"css","gif","htm","html","txt","xml"});
回答by Adam Robinson
If you're using .NET 2.0 or greater, you should be using the generic List<T>type (even if it's List<object>, which would given you the same functionality as ArrayList).
如果您使用 .NET 2.0 或更高版本，您应该使用泛型List<T>类型（即使它是List<object>，它会给您与 相同的功能ArrayList）。
If you're using .NET 3.5 or greater, you can use this syntax:
如果您使用 .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"
};
Either way, however, if you want to stick with ArrayList, you can just do:
但是，无论哪种方式，如果您想坚持使用ArrayList，您都可以这样做：
private static System.Collections.ArrayList alFileTypes =
new System.Collections.ArrayList(new object[] {"css","gif","htm","html","txt","xml"});
回答by TLiebe
Try
尝试
private static System.Collections.ArrayList alFileTypes = new System.Collections.ArrayList(){"css","gif","htm","html","txt","xml"};
回答by Thomas Levesque
C# 3.0 with a generic List<T>, rather than an ArrayList:
C# 3.0 使用泛型List<T>，而不是ArrayList：
private static List<string> alFileTypes =
new List<string> {"css","gif","htm","html","txt","xml"};
