您不能指望获得可以粘贴的完整代码。我很快在记事本中写下了此内容,以便让您了解事件在这种情况下如何最好地发挥作用。我假设Form1直接打开Form3。下面的解决方案展示了如何使用事件。
您的家庭作业是通过在其间添加另一个表单 Form2 来使其工作。您可以通过位于中间的 Form2 传播相同的事件来实现此目的。
Form3.cs
public partial class Form3 : Form
{
public event EventHandler<AddRecordEventArgs> RecordAdded
public Form3()
{
InitializeComponent();
}
private void buttonAddRow _Click(object sender, EventArgs e)
{
OnRecordAdded();
}
private void OnRecordAdded() {
var handler = RecordAdded;
if(RecordAdded != null) {
RecordAdded.Invoke(this, new AddRecordEventArgs(txtQty.Text, txtDesc.Text, txtPrice.Text))
}
}
}
添加记录事件参数.cs
public class AddRecordEventArgs : EventArgs
{
public AddRecordEventArgs(string qty, string desc, string price) {
Quantity = qty;
Description = desc;
Price = price;
}
public int Quantity { get; private set; }
public string Description { get; private set; }
public decimal Price { get; private set; }
}
Form1.cs
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void buttonOpenForm3_Click(object sender, EventArgs e)
{
Form3 frm3 = new Form3();
frm3.RecordAdded += Form3_RecordAdded;
frm3.Show();
}
private void Form3_RecordAdded(object sender, AddRecordEventArgs e) {
// Access e.Quantity, e.Description and e.Price
// and add new row in grid using these values.
}
}