Question

我正在使用listview，并尝试使用文件填充。我需要在表格开始后立即读入文件。

private void mainForm_Load(object sender, EventArgs e)
    {
        //get file read in
        if (File.Exists("../../MealDeliveries.txt"))
        {
            StreamReader sr = new StreamReader("../../MealDeliveries.txt");
            //first line is delivery name
            string strDeliveryName = sr.ReadLine();
            do
            {
                //other lines
                Delivery d = new Delivery(strDeliveryName, sr.ReadLine(), sr.ReadLine(), sr.ReadLine(), sr.ReadLine(), sr.ReadLine(), sr.ReadLine());
                mainForm.myDeliveries.Add(d);
                //check for further values
                strDeliveryName = sr.ReadLine();
                //stop if no more values
            } while (strDeliveryName != null);
            displayDeliveries();
        }
    }


private void displayDeliveries()
    {
        lstDeliveryDetails.Items.Clear();
        foreach (Delivery d in mainForm.myDeliveries)
        {
            lstDeliveryDetails.Items.Add(d.DeliveryName);
        }
    }

listview没有显示任何内容，尽管文件肯定在那里！

Answer 1

是的，它应该假定文件位于您认为的位置。你肯定文件存在吗？

试试这个。它至少会确认是否找到了该文件。

private void mainForm_Load(object sender, EventArgs e) 
{
    string fileName = @"..\..\MealDeliveries.txt";

    if (!File.Exists(fileName))
    {
        MessageBox.Show("File not found!");
        return;
    }

    using (StreamReader sr = new StreamReader(fileName))
    {
        //first line is delivery name 
        string strDeliveryName = sr.ReadLine(); 
        while (strDeliveryName != null)
        { 
            //other lines 
            Delivery d = new Delivery(strDeliveryName, sr.ReadLine(),
                                      sr.ReadLine(), sr.ReadLine(),
                                      sr.ReadLine(), sr.ReadLine(),
                                      sr.ReadLine());
            mainForm.myDeliveries.Add(d);

            //check for further values
            strDeliveryName = sr.ReadLine();
        }
    }
    displayDeliveries();
}

需要注意的另一件事是将字符串作为字符串读取以传递给业务对象（交付）。您可能会发现使用XmlSerializer提供的某种序列化格式或Marcos Meli's FileHelpers库支持的某种文件格式会更好。无论哪种方式，都需要比读取字符串更强大的东西。

Answer 2

也许它会起作用但你还需要用IDisposable包裹using。像这样：

using (StreamReader sr = new StreamReader("../../MealDeliveries.txt"))
{
            //first line is delivery name
            string strDeliveryName = sr.ReadLine();
            do
            {
                //other lines
                Delivery d = new Delivery(strDeliveryName, sr.ReadLine(), sr.ReadLine(), sr.ReadLine(), sr.ReadLine(), sr.ReadLine(), sr.ReadLine());
                mainForm.myDeliveries.Add(d);
                //check for further values
                strDeliveryName = sr.ReadLine();
                //stop if no more values
            } while (strDeliveryName != null);
            displayDeliveries();
}

需要从表单加载读入文件

2 个答案: