Question

我正在访问.CSV文件并转换要在DataGrid中显示的值，我的问题是我只有一个已定义的实例，它曾经在循环之外，我没有设置它的属性。

如何在循环中创建多个实例并在我使用时设置属性值？

CSV格式为： “标题” 'string，string，int，string'（最多300个条目）

以下是主要代码，点击菜单 - ＆gt;打开：

        // Function to open a .CSV file and assign the values within to a List.
    private void openToolStripMenuItem_Click(object sender, EventArgs e)
    {
        List<Stock> stocks = new List<Stock>();
        // Set strings to retrieve current directory and store stocklist.csv as "filename"
        string filename = @"C:\StockFile\stocklist.csv";

        // Read all lines in file and set indexer to 0.
        string[] linesInFile = File.ReadAllLines(filename);
        string[] StockDetails = new string[0];

        for (int i = 1; i < linesInFile.Length; i++)
        {
            // Load lines in file and increment by 1.
            string currentLine1 = linesInFile[i];
            // Split the current line by separator ,
            StockDetails = currentLine1.Split(',');

            Stock item = new Stock();
            stocks.Add(item);
        }
        var list = new BindingList<Stock>(stocks);
        stockGridView.DataSource = list;
    }

这是我的Stock类：

    class Stock
    {
        public string Code { get; internal set; }
        public string Desc { get; internal set; }
        public int CurCnt { get; internal set; }
        public string Order { get; internal set; }

        public Stock(string code, string desc, int curcnt, string order)
        {
            Code = code;
            Desc = desc;
            CurCnt = curcnt;
            Order = order;
        }
    }

Answer 1

如果我理解你要做什么，你需要初始化Stock项的实例，并且每次在循环中new关键字将创建它的新实例并将创建的实例添加到列表

 private void openToolStripMenuItem_Click(object sender, EventArgs e)
    {
        List<Stock> stocks = new List<Stock>();
        // Set strings to retrieve current directory and store stocklist.csv as "filename"
        string filename = @"C:\StockFile\stocklist.csv";

        // Read all lines in file and set indexer to 0.
        string[] linesInFile = File.ReadAllLines(filename);
        string[] StockDetails = new string[0];

        for (int i = 1; i < linesInFile.Length; i++)
        {
            // Load lines in file and increment by 1.
            string currentLine1 = linesInFile[i];
            // Split the current line by separator ,
            StockDetails = currentLine1.Split(',');

        Stock item = new Stock(StockDetails[0],StockDetails[1],StockDetails[2],StockDetails[3]);
    stocks.Add(item);
        }
        var list = new BindingList<Stock>(stocks);
        stockGridView.DataSource = list;
    }

创建多个实例并设置属性值

1 个答案: