c# - Form_Load() - 传递参数

Question

我正在为离开我雇主的同事开发的代码添加一个功能。我将尝试在一个简单的案例中解释解决方案 -

我有 2 个表格 A 和 B。

在 A 表单上，我从用户那里获取文件夹路径，然后单击 A 上的按钮。

在单击表单 A 的按钮时，我需要将路径传递给表单 B 的方法 M。我公开了方法 M，并在表单 A 的 button_click 中编写了以下代码。

private void startButton_Click(object sender, EventArgs e)
{
    startButton.Enabled = false;
    pathTextBox.Enabled = false;
    using (Form1 form1 = new Form1())
    {
        // This is what I am trying to do. Initially start() did not had any input parameters, now I have added a single input parameter to it. 
        form1.start(pathTextBox.Text);
    }

    //this.Close();
}

Now, this works except that FormA_Load() is defined like this -

private void FormA_Load(object sender, EventArgs e)
{
    start();
}

问题是我如何将 pathBox.Text 传递给 FormA_Load()，因为它会抛出错误

No overload for method 'start' takes 0 arguments

public void start(string selectedPath)
{
    try
    {
        this.Cursor = Cursors.WaitCursor;
        SMSManager smsManager = new SMSManager (selectedPath);
        smsManager .CopyCompletedHandler += new SMSManager .CopyCompleted(smsManager_CopyCompletedHandler);
        smsManager .CopyLogFiles();
    }
    catch (Exception ex)
    {
        WriteLog(ex);

        smsManager _CopyCompletedHandler("Error :" + ex.Message, false);
        this.Cursor = Cursors.Default;
        MessageBox.Show(ex.Message);
    }
}

void smsManager_CopyCompletedHandler(string data, bool isFullyCompleted)
{
    Invoke((MethodInvoker)delegate
    {
        this.Text = "SMS Collector- Copying...";
        txtStatus.AppendText(stepNo + ". " + data + Environment.NewLine + Environment.NewLine);
        txtStatus.ScrollToCaret();
        stepNo++;
        if (isFullyCompleted)
        {
            this.Cursor = Cursors.Default;
            this.Text = "SMS Collector- Completed";
            MessageBox.Show(this, data, "Message", MessageBoxButtons.OK,
                            MessageBoxIcon.Information);
        }
    });

}

Answer 1

您的代码需要的第一个更改。
通过被调用表单的构造函数传递文本框中的信息，然后显示表单

private void startButton_Click(object sender, EventArgs e)
{
    startButton.Enabled = false;
    pathTextBox.Enabled = false;
    using (Form1 form1 = new Form1(pathTextBox.Text))
    {
         // ShowDialog is required to stop the execution here 
         // Otherwise the code exits immediately and the using destroys the form1 instance
         form1.ShowDialog();
    }
}

现在以调用的形式将传递的路径保存在全局变量中

public class Form1 
{
     private string _selectedPath = string.Empty;
     public Form1(string path)
     {
        InitializeComponents();
        _selectedPath = path;
     }
     .....
}

现在您可以在表单加载事件中调用 SMS 系统的初始化(或者更好地覆盖 OnLoad 事件。)现在这是安全的，因为在 OnLoad 覆盖中表单的控件已完全初始化并准备好使用

protected override void OnLoad(EventArgs e)
{
  // The code here will be executed before the Form.Load event
  start(_selectedPath);
  base.OnLoad(e);
  // The code here will be executed after the Form.Load event
}