选择在LINQ多维阵列 [英] Selecting a multi-dimensional array in LINQ
问题描述
我有,我需要一个DataTable转换为一个二维数组的任务。这是很容易,只需遍历的行和列(见下面的例子)来完成。
I have a task where I need to translate a DataTable to a two-dimensional array. That's easy enough to do by just looping over the rows and columns (see example below).
private static string[,] ToArray(DataTable table)
{
var array = new string[table.Rows.Count,table.Columns.Count];
for (int i = 0; i < table.Rows.Count; ++i)
for (int j = 0; j < table.Columns.Count; ++j)
array[i, j] = table.Rows[i][j].ToString();
return array;
}
我真正想要做的是使用LINQ SELECT语句生成二维数组。不幸的是,它看起来像没有在LINQ没有办法选择一个多维数组。是的,我知道,我可以使用LINQ选择一个交错数组,但是这不是我想要的。
What I'd really like to do is use a select statement in LINQ to generate that 2D array. Unfortunately it looks like there is no way in LINQ to select a multidimensional array. Yes, I'm aware that I can use LINQ to select a jagged array, but that's not what I want.
是我的假设是正确的,或者是有办法使用LINQ选择一个多维数组?
Is my assumption correct, or is there a way to use LINQ to select a multi-dimensional array?
推荐答案
我不认为这是可能的。我的理由是,选择以及大多数其他LINQ功能要求,他们对工作的藏品至少实现的IEnumerable< T>
对于一些T:
I don't think it is possible. My reasoning is that Select and most other LINQ functions require that the collections they work on implement at least IEnumerable<T>
for some T:
public static IEnumerable<TResult> Select<TSource, TResult>(
this IEnumerable<TSource> source,
Func<TSource, TResult> selector
)
一个矩形阵列不执行的IEnumerable< T>
对于任意t,因此不能返回值一个选择功能。
A rectangular array doesn't implement IEnumerable<T>
for any T so it can't be the return value of a Select function.
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