[英]How to convert jagged array to 2D array?
I have a file file.txt
with the following: 我有一个文件
file.txt
以下各项:
6,73,6,71
32,1,0,12
3,11,1,134
43,15,43,6
55,0,4,12
And this code to read it and feed it to a jagged array: 并通过以下代码读取它并将其提供给锯齿状数组:
string[][] arr = new string[5][];
string[] filelines = File.ReadAllLines("file.txt");
for (int i = 0; i < filelines.Length; i++)
{
arr[i] = filelines[i].Split(',').ToArray();
}
How would I do the same thing, but with a 2D array? 如果使用2D阵列,我将如何做同样的事情?
Assuming you know the dimensions of your 2D array (or at least the maximum dimensions) before you start reading the file, you can do something like this: 假设您在开始读取文件之前了解 2D数组的尺寸(或至少是最大尺寸),则可以执行以下操作:
string[,] arr = new string[5,4];
string[] filelines = File.ReadAllLines("file.txt");
for (int i = 0; i < filelines.Length; i++)
{
var parts = filelines[i].Split(','); // Note: no need for .ToArray()
for (int j = 0; j < parts.Length; j++)
{
arr[i, j] = parts[j];
}
}
If you don't know the dimensions, or if the number of integers on each line may vary, your current code will work, and you can use a little Linq to convert the array after you've read it all in: 如果您不知道尺寸,或者每行整数的数量可能有所不同,那么您当前的代码将起作用,并且在阅读完所有内容后可以使用一点Linq来转换数组:
string[] filelines = File.ReadAllLines("file.txt");
string[][] arr = new string[filelines.Length][];
for (int i = 0; i < filelines.Length; i++)
{
arr[i] = filelines[i].Split(','); // Note: no need for .ToArray()
}
// now convert
string[,] arr2 = new string[arr.Length, arr.Max(x => x.Length)];
for(var i = 0; i < arr.Length; i++)
{
for(var j = 0; j < arr[i].Length; j++)
{
arr2[i, j] = arr[i][j];
}
}
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