C# multithreading concurrency parallel-extensions

如何使用多维数组调用 Parallel.ForEach

发布于 2024-09-10 16:50:18 字数 646 浏览 11 评论 0原文

我在弄清楚如何使用 2D 字符串数组调用 Parallel.ForEach 时遇到了一些麻烦：

string[,] board = new string[,]{
        {"A", "B", "C", "D", "E" },
        {"F", "G", "H", "I", "J"},
        {"K", "L", "M", "N", "O"},
        {"0", "1", "2", "3", "4"}};

Parallel.ForEach(board, row =>
    {
        for (int i = 0; i < row.Length; ++i)
        {
            // find all valid sequences
        }
    });

如果我没有明确指定类型，则会收到以下错误：

方法的类型参数 'System.Threading.Tasks.Parallel.ForEach(System.Collections.Generic.IEnumerable, System.Action)' 不能从使用情况推断。尝试指定类型参数明确地。

显式指定类型参数的正确方法是什么？

原文

I'm having a little trouble figuring out how to call the Parallel.ForEach with a 2D array of strings:

string[,] board = new string[,]{
        {"A", "B", "C", "D", "E" },
        {"F", "G", "H", "I", "J"},
        {"K", "L", "M", "N", "O"},
        {"0", "1", "2", "3", "4"}};

Parallel.ForEach(board, row =>
    {
        for (int i = 0; i < row.Length; ++i)
        {
            // find all valid sequences
        }
    });

If I don't specify the type explicitly I get the following error:

The type arguments for method
'System.Threading.Tasks.Parallel.ForEach(System.Collections.Generic.IEnumerable,
System.Action)' cannot be
inferred from the usage. Try
specifying the type arguments
explicitly.

What's the proper way to specify the type arguments explicitly?

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ゝ偶尔ゞ 2024-09-17 16:50:18

您面临的问题是二维数组没有实现 IEnumerable<一维数组>。（它确实实现了 IEnumerable，但它是一个“扁平化”数组的字符串的 IEnumerable。）您可以执行两件事：

更改 string[ ,] 为锯齿状数组，string[][]。
实现您自己的扩展方法，迭代二维数组并将其转换为 IEnumerable<一维数组>。

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私藏温柔 2024-09-17 16:50:18

您仍然应该能够使用多维数组来完成此操作，只需使用 Parallel.For 而不是 Parallel.ForEach：

string[,] board = new string[,] {
    {"A", "B", "C", "D", "E" },
    {"F", "G", "H", "I", "J"},
    {"K", "L", "M", "N", "O"},
    {"0", "1", "2", "3", "4"}
};

int height = board.GetLength(0);
int width = board.GetLength(1);

Parallel.For(0, height, y =>
    {
        for (int x = 0; x < width; ++x)
        {
            string value = board[y, x];
            // do whatever you need to do here
        }
    }
);

You should still be able to make this work with a multi-dimensional array, just using Parallel.For instead of Parallel.ForEach:

string[,] board = new string[,] {
    {"A", "B", "C", "D", "E" },
    {"F", "G", "H", "I", "J"},
    {"K", "L", "M", "N", "O"},
    {"0", "1", "2", "3", "4"}
};

int height = board.GetLength(0);
int width = board.GetLength(1);

Parallel.For(0, height, y =>
    {
        for (int x = 0; x < width; ++x)
        {
            string value = board[y, x];
            // do whatever you need to do here
        }
    }
);

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