转换列表< T>到阵列(多维) [英] Converting List<T> to Array (multidimensional)

问题描述

可能重复:
如何转换列表<>到多维数组?

Possible Duplicate:
How can I convert a list<> to a multi-dimensional array?

我想为此使用double[,]形式的数组，因为我不知道该数组的长度是什么，我想先制作一个List，然后再使用List<T>.ToArray()转换为double[,]:

I want to have an array in form of double[,] for this purpose since I do not know what will be the length of this array, I want to make a List first then later using List<T>.ToArray() convert it to double[,]:

public double[,] FilterClampedData(double[,] data)
{
    var finalData = new List<double[]>();

    //Do some stuff on parameter

    return finalData.ToArray(); ///Does not compile :(
}

推荐答案

由于ToArray返回一维数组，因此也难怪为什么不编译.如果返回double[][]，它将编译.您还可以通过两个嵌套循环手动构建二维数组:

Since ToArray returns a one-dimensional array, there is no wonder why this does not compile. If you were returning double[][], it would compile, however. You could also build your 2-D array manually with two nested loops:

var R = finalData.Count;
var C = finalData[0].Length;
var res = new double[R, C];
for (int r = 0 ; r != R ; r++)
    for (int c = 0 ; c != C ; c++)
        res[r, c] = finalData[r][c];
return res;

上面的代码假定finalData中至少有一项，并且finalData中所有列表的长度是相同的.

The code above assumes that you have at least one item in the finalData, and that the length of all lists inside finalData is the same.

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