如何使用C#计算一个大(5+ GB)文件中字符的出现次数？

string filePath = "path/to/your/file.txt";
StreamReader reader = new StreamReader(filePath);

string line;
while ((line = reader.ReadLine()) != null)
{
    // 处理每行内容
}

Dictionary<char, int> charCount = new Dictionary<char, int>();

foreach (char c in line)
{
    if (charCount.ContainsKey(c))
    {
        charCount[c]++;
    }
    else
    {
        charCount[c] = 1;
    }
}

reader.Close();

string filePath = "path/to/your/file.txt";
StreamReader reader = new StreamReader(filePath);

Dictionary<char, int> charCount = new Dictionary<char, int>();
string line;

while ((line = reader.ReadLine()) != null)
{
    foreach (char c in line)
    {
        if (charCount.ContainsKey(c))
        {
            charCount[c]++;
        }
        else
        {
            charCount[c] = 1;
        }
    }
}

reader.Close();

// 输出字符及其出现次数
foreach (KeyValuePair<char, int> entry in charCount)
{
    Console.WriteLine("Character: " + entry.Key + ", Count: " + entry.Value);
}