原文链接:https://blog.csdn.net/irwin_chen/article/details/7430524
有时子窗体的操作需要实时调用父窗体中的控件操作,比如在父窗体的文本框中显示子窗体中的输出:

主窗体:
MainForm.cs:
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
SubForm SubForm = new SubForm();
// 3.将ChangeTextVal加入到委托事件中
// 等效于:
// SubForm.ChangeTextVal += ChangeTextVal;
SubForm.ChangeTextVal += new DelegateChangeTextVal(ChangeTextVal);
SubForm.ShowDialog();
}
public void ChangeTextVal(string TextVal)
{
this.textBox1.Text = TextVal;
}
}
子窗体:
SubForm.cs:
// 1.定义委托类型
public delegate void DelegateChangeTextVal(string TextVal);
public partial class SubForm : Form
{
// 2.定义委托事件
public event DelegateChangeTextVal ChangeTextVal;
public SubForm()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
ChangeMainFormText(this.textBox1.Text);
}
private void ChangeMainFormText(string TextVal)
{
// 4.调用委托事件函数
ChangeTextVal(TextVal);
}
}