C# 转换二维数组
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Convert 2 dimensional array
提问by Manoj
What is selectMany.ToArray()method? Is it a built in method in C#?
什么是selectMany.ToArray()方法？它是内置方法C#吗？
I need to convert two dimensional array to one dimensional array.
我需要将二维数组转换为一维数组。
回答by CMS
SelectManyis a projection operator, an extension method provided by the namespace System.Linq.
SelectMany是一个投影运算符，是命名空间 System.Linq 提供的扩展方法。
It performs a one to many element projection over a sequence, allowing you to "flatten" the resulting sequences into one.
它对序列执行一对多元素投影，允许您将结果序列“展平”为一个。
You can use it in this way:
你可以这样使用它：
int[][] twoDimensional = new int[][] {
new int[] {1, 2},
new int[] {3, 4},
new int[] {5, 6}
};
int [] flattened = twoDimensional.SelectMany(x=>x).ToArray();
回答by Marc Gravell
If you mean a jaggedarray (T[][]), SelectManyis your friend. If, however, you mean a rectangulararray (T[,]), then you can just enumerate the date data via foreach- or:
如果您的意思是锯齿状数组 ( T[][])，那么它SelectMany就是您的朋友。但是，如果您的意思是矩形数组 ( T[,])，那么您可以通过foreach- 或：
int[,] from = new int[,] {{1,2},{3,4},{5,6}};
int[] to = from.Cast<int>().ToArray();
回答by iperov
my solution:
我的解决方案：
public struct Array3D<T>
{
public T[] flatten;
int x_len;
int y_len;
int z_len;
public Array3D(int z_len, int y_len, int x_len)
{
this.x_len = x_len;
this.y_len = y_len;
this.z_len = z_len;
flatten = new T[z_len * y_len * x_len];
}
public int getOffset(int z, int y, int x) => y_len * x_len * z + x_len * y + x;
public T this[int z, int y, int x] {
get => flatten[y_len * x_len * z + x_len * y + x];
set => flatten[y_len * x_len * z + x_len * y + x] = value;
}
public T this[int flat_index] {
get => flatten[flat_index];
set => flatten[flat_index] = value;
}
}
