Question

我有一个文件需要保存为数组。我正在尝试使用StreamReader将文本文件转换为整数数组。我不确定在代码末尾的for循环中放入什么。

这是我到目前为止所做的：

//Global Variables
int[] Original;
//Load File
private void mnuLoad_Click_1(object sender, EventArgs e)
{
    //code to load the numbers from a file
    OpenFileDialog fd = new OpenFileDialog();

    //open the file dialog and check if a file was selected
    if (fd.ShowDialog() == DialogResult.OK)
    {
    //open file to read
    StreamReader sr = new StreamReader(fd.OpenFile());
    int Records = int.Parse(sr.ReadLine());

    //Assign Array Sizes
    Original = new int[Records];

    int[] OriginalArray;

    for (int i = 0; i < Records; i++)
    {
    //add code here
    }
}

.txt文件是：

PS我是初学者，所以我的编码技巧非常基础！

更新：我之前有使用Line.Split，然后将文件映射到数组的经验，但显然这不适用于此，所以我现在该怎么办？

//as continued for above code
for (int i = 0; i < Records; i++)
{
    int Line = int.Parse(sr.ReadLine());
    OriginalArray = int.Parse(Line.Split(';')); //get error here

    Original[i] = OriginalArray[0];
}

Answer 1

您应该能够使用与其上面相似的代码：

OriginalArray[i] = Convert.ToInt32(sr.ReadLine());

每次调用sr.ReadLine时，它都会将数据指针递增1行，从而遍历文本文件中的数组。

Answer 2

试试这个

OpenFileDialog fd = new OpenFileDialog();

if (fd.ShowDialog() == DialogResult.OK)
{
    StreamReader reader = new StreamReader(fd.OpenFile());

    var list = new List<int>();

    while (!reader.EndOfStream)
    {
        var line = reader.ReadLine();
        int value = 0;
        if (!string.IsNullOrWhiteSpace(line) && int.TryParse(line, out value))
            list.Add(value);
    }

    MessageBox.Show(list.Aggregate("", (x, y) => (string.IsNullOrWhiteSpace(x) ? "" : x + ", ") + y.ToString()));
}

Answer 3

您可以将整个文件读入字符串数组，然后解析（检查每个文件的完整性）。

类似的东西：

int[] Original;
//Load File
private void mnuLoad_Click_1(object sender, EventArgs e)
{
    //code to load the numbers from a file
    var fd = new OpenFileDialog();

    //open the file dialog and check if a file was selected
    if (fd.ShowDialog() == DialogResult.OK)
    {
        var file = fd.FileName;

        try
        {
            var ints = new List<int>();
            var data = File.ReadAllLines(file);

            foreach (var datum in data)
            {
                int value;
                if (Int32.TryParse(datum, out value))
                {
                    ints.Add(value);
                }
            }

            Original = ints.ToArray();

        }
        catch (IOException)
        {
            // blah, error
        }
    }
}

Answer 4

另一种方法是，如果您想要阅读文件的末尾并且您不知道使用while循环有多长时间：

String line = String.Empty;
int i=0;
while((line = sr.ReadLine()) != null)
{
    yourArray[i] = Convert.ToInt32(line);
    i++;

    //but if you only want to write to the file w/o any other operation
    //you could just write w/o conversion or storing into an array
    sw.WriteLine(line); 
    //or sw.Write(line + " "); if you'd like to have it in one row
}

Answer 5

//using linq & anonymous methods (via lambda)
string[] records = File.ReadAllLines(file);
int[] unsorted = Array.ConvertAll<string, int>(records, new Converter<string, int>(i => int.Parse(i)));

如何将.txt文件中的数字读取为整数数组？

5 个答案: