I am looking for the simplest way to write the following Java code
Arrays.asList(1L);
in .Net
Thanks
int[] a = new int[] { 1, 2, 3, 4, 5 };
List<int> list = a.ToList(); // Requires LINQ extension method
//Another way...
List<int> listNew = new List<int>(new []{ 1, 2, 3 }); // Does not require LINQ
Note that LINQ
is available in .NET 3.5
or higher.
Since arrays already implement IList<T>
in .NET then there's not really any need for an equivalent of Arrays.asList
. Just use the array directly, or if you feel the need to be explicit about it:
IList<int> yourList = (IList<int>)existingIntArray;
IList<int> anotherList = new[] { 1, 2, 3, 4, 5 };
This is about as close as you'll get to the Java original: fixed-size, and writes pass through to the underlying array (although in this case the list and the array are exactly the same object).
Further to the comments on Devendra's answer , if you really want to use exactly the same syntax in .NET then it'll look something like this (although it's a pretty pointless exercise, in my opinion).
IList<int> yourList = Arrays.AsList(existingIntArray);
IList<int> anotherList = Arrays.AsList(1, 2, 3, 4, 5);
// ...
public static class Arrays
{
public static IList<T> AsList<T>(params T[] source)
{
return source;
}
}
not sure whether you want to convert an array to a list as per Devendra's answer or create a new populated list in one go if it's the second then this'll do it:
new List<int>(){1, 2, 3, 4, 5};
In fact the braces syntax to populate collections will populate Arrays, dictionaries etc...
The implementation of that static method looks like this.
public static <T> List<T> asList(T... a) {
return new ArrayList<T>(a);
}
The equivalent for You wold be write same utility class with method asList in C# or use the solution presented by Massif.
public static class Arrays {
public static List<T> asList<T>(params T[] a)
{
return new List<T>(a);
}
}
要创建单项数组,您只需执行以下操作:
long[] arr = new[] { 1L };
return new List<int> {A,B};
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