将双精度数组转换为 IComparable 数组
我正在尝试使用 VB.NET 创建一个 Quicksort 基类，并将其作为 IComparable 元素的数组。 签名看起来像这样：
public shared sub Sort(ByVal values() as IComparable)
但是，当我传递一个双精度数组时，编译器给出了错误。
Dim numbers(100) as double
Dim random as new Random(0)
for i as integer = 0 to numbers.length - 1
numbers(i) = random.NextDouble()
Next
QuickSort.Sort(numbers) ' gives compiler error.
错误是：
Error 88 Value of type '1-dimensional array of Double' cannot be converted to '1-dimensional array of System.IComparable' because 'Double' is not derived from 'System.IComparable'. C:\Proving Grounds\Module1.vb
.NET 文档指出 double 实现了 IComparable。 为什么 .NET 编译器不允许我这样做？
I'm trying to create a Quicksort base class using VB.NET, taking it an array of IComparable elements. The signature looks like this:
public shared sub Sort(ByVal values() as IComparable)
However, when I pass in an array of doubles, the compiler is giving me errors.
Dim numbers(100) as double
Dim random as new Random(0)
for i as integer = 0 to numbers.length - 1
numbers(i) = random.NextDouble()
Next
QuickSort.Sort(numbers) ' gives compiler error.
The error is:
Error 88 Value of type '1-dimensional array of Double' cannot be converted to '1-dimensional array of System.IComparable' because 'Double' is not derived from 'System.IComparable'. C:\Proving Grounds\Module1.vb
The .NET documentation states that double's implement IComparable. Why isn't the .NET compiler letting me do this?
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虽然
double可以转换为IComparable，但这并不意味着double[]可以转换为IComparable[]. 一个简单的选择是创建一个新的IComparable[]数组并复制数据 - 或者在您的情况下，只需将原始数组启动为IComparable[]即可。实际上，我很想使用通用的
IComparable或IComparer接口，或Comparison委托- 全部使用泛型 - 这也允许使用Comparer.Default 和非默认比较器。Although
doublecan be cast toIComparable, it doesn't mean thatdouble[]can be cast toIComparable[]. A simple option would be to create a newIComparable[]array and copy the data over - or in your case, simply start the original array asIComparable[].Actually, I'd be tempted to use the generic
IComparable<T>orIComparer<T>interfaces, or theComparison<T>delegate - all using generics - this also allows use ofComparer<T>.Defaultand non-default comparers.