c# - 如何检查一个数字在文本文件中的特定行中出现了多少次

Question

到目前为止，这是我的代码。我知道这很乱，关于如何让它发挥作用有什么想法吗？

我想输出一个数字在文本文件中出现的次数。我想从代码中以字母 Time 开头的特定行获取数字

计算所有 3 个时段的成员总数

文本文件是这样的:

*****************************
Participant: 1

Location: UK
Name: George 
Phone Number: 69347653633
Time Slot: 1
*****************************

*****************************
Participant: 2

Location: FR
Name: Alex 
Phone Number: 69635343623
Time Slot: 2
*****************************

*****************************
Participant: 3

Location: gr
Name: Maria 
Phone Number: 694785896
Time Slot: 3
*****************************

例如，我想要这样的输出:

Total Member Registered for Slot 1: 5

Total Member Registered for Slot 2: 1

Total Member Registered for Slot 3: 3

数字在1到3之间

到目前为止我得到的输出是:

1 was found 1 times
1 was found 1 times
1 was found 1 times
2 was found 1 times
3 was found 1 times
1 was found 1 times
1 was found 1 times
1 was found 1 times
1 was found 1 times
1 was found 1 times

关于如何改进和修复它的任何想法？

public static void ReadNumbers()
{
    // Declare list
    string[] lines = File.ReadAllLines("text.TXT");

    IEnumerable<string> selectLines = lines.Where(line => line.StartsWith("Time"));

    foreach (var item in selectLines)
    {
        var getNumbers = (from num in item where char.IsNumber(num) select num).ToArray();

        //Console.WriteLine(new string(getNumbers));
        getNumbers.ToArray();

        foreach (var group in getNumbers.GroupBy(n => n))
        {
            Console.WriteLine("{0} was found {1} times", group.Key, group.Count());
        }
    }
}

Answer 1

更新的答案

我看到您对原始问题进行了一些编辑，并对另一个答案发表了评论，这使得该答案需要进行一些调整。具体来说，您似乎希望结果按升序显示(从插槽 1 到 3)。你还说:

I want also if a slot has not any appear in the file to display Number 2 appeared 0 times.

所以这是我提出的解决方案:

public static void ReadNumbers()
{
    string[] lines = File.ReadAllLines("text.TXT");

    var groups = lines
        .Where(line => line.StartsWith("Time"))
        .Select(line => Int32.Parse(new String(line.Where(Char.IsDigit).ToArray())))
        .GroupBy(number => number);

    for(int i = 1; i <= 3; i ++)
    {
        var count = groups.FirstOrDefault(group => group.Key == i)?.Count() ?? 0;
        Console.WriteLine($"Total Members Registered for Slot {i}: {count}");
    }
}

注意:此代码未经测试但应该有效。

我还想补充一点，在接受答案后更改您的问题通常被认为是不礼貌的，这样的更改需要对所述答案进行更改。在这种情况下，您通常会问一个新问题。

原始答案

这是我的做法:

public static void ReadNumbers()
{
    string[] lines = File.ReadAllLines("text.TXT");

    var groups = lines
        .Where(line => line.StartsWith("Time"))
        .Select(line => Int32.Parse(new string(line.Where(Char.IsDigit).ToArray())))
        .GroupBy(number => number);

    foreach(var group in groups)
        Console.WriteLine($"{group.Key} appeared: {group.Count()} times");
}

请注意，此方法假定您的文件遵循您在问题中显示的相同格式。

如果您的文件在同一行中出现任何“时间”而没有包含数字，它也会抛出错误。例如，如果您的文件包含如下行:"Time Slot: " 或 "Time Slot: SomeValueThatIsNotANumber" 那么它将抛出。