C#提高数据转换效率的5个超实用技巧分享

// 示例：使用 Span<T> 转换字节数组为整数数组
byte[] byteArray = { 0x01, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00 };
Span<int> intSpan = MemoryMarshal.Cast<byte, int>(byteArray.AsSpan());

// 输出转换结果
foreach (var num in intSpan)
{
    Console.WriteLine(num); // 输出：1 和 2
}

// 示例：使用 Memory<T> 传递数据
public void ProcessData(Memory<int> data)
{
    Span<int> span = data.Span;
    // 对数据进行操作
    foreach (var num in span)
    {
        Console.WriteLine(num);
    }
}

// 调用示例
int[] dataArray = { 1, 2, 3, 4 };
ProcessData(dataArray.AsMemory());

// 示例：异步读取文件并转换为字符串
public async Task<string> ReadFileAsync(string filePath)
{
    using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read, 4096, true))
    {
        using (BufferedReader reader = new BufferedReader(new StreamReader(fs)))
        {
            return await reader.ReadToEndAsync();
        }
    }
}

// 调用示例
string filePath = "example.txt";
string content = await ReadFileAsync(filePath);
Console.WriteLine(content);

// 示例：异步发送 HTTP 请求
public async Task<string> FetchDataAsync(string url)
{
    using (HttpClient client = new HttpClient())
    {
        HttpResponseMessage response = await client.GetAsync(url);
        response.EnsureSuccessStatusCode();
        return await response.Content.ReadAsStringAsync();
    }
}

// 调用示例
string url = "https://api.example.com/data";
string data = await FetchDataAsync(url);
Console.WriteLine(data);

// 示例：并行处理数组
int[] numbers = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
Parallel.For(0, numbers.Length, i =>
{
    numbers[i] = numbers[i] * 2; // 对每个数字乘以 2
});

// 输出结果
foreach (var num in numbers)
{
    Console.WriteLine(num); // 输出：2, 4, 6, 8, 10, 12, 14, 16, 18, 20
}

// 示例：并行处理集合
ConcurrentDictionary<int, string> dictionary = new ConcurrentDictionary<int, string>();
Parallel.For(0, 10, i =>
{
    dictionary.TryAdd(i, $"Value {i}"); // 并行添加数据
});

// 输出结果
foreach (var kvp in dictionary)
{
    Console.WriteLine($"{kvp.Key}: {kvp.Value}");
}

// 示例：使用 LinkedList 处理频繁插入和删除的数据
LinkedList<int> linkedList = new LinkedList<int>();
linkedList.AddLast(1);
linkedList.AddLast(2);
linkedList.AddLast(3);

// 删除第一个元素
linkedList.RemoveFirst();

// 插入一个元素到头部
linkedList.AddFirst(0);

// 输出结果
foreach (var num in linkedList)
{
    Console.WriteLine(num); // 输出：0, 2, 3
}

// 示例：使用内存池
MemoryPool<int> pool = MemoryPool<int>.Shared;
IMemoryOwner<int> owner = pool.Rent(10); // 租用一个大小为 10 的内存块
Span<int> span = owner.Memory.Span;

// 使用内存块
for (int i = 0; i < span.Length; i++)
{
    span[i] = i * 2;
}

// 输出结果
foreach (var num in span)
{
    Console.WriteLine(num); // 输出：0, 2, 4, 6, 8, 10, 12, 14, 16, 18
}

// 释放内存
owner.Dispose();