实际上过去我也写过类似的主题,这里把各种方法总结一下,内容的确基础了一些,所以这篇文章是写给刚刚学习C#的同行们的,希望对大家有些帮助吧!很抱歉,这篇文章没有诡异的bug来勾起大家的兴趣,但是下篇文章我会努力写些有趣的主题的!
在窗体间传递数据的方法比较多:
1,在子窗体中自定义一个构造函数,参数类型是主窗体,当要显示子窗体的时候,就用这个构造函数来实例化子窗体,然后把this指针传进去,说起来太抽象了,我大概一写大家应该就明白了:
- public class frmMain:Form
- {
- ...
- frmControl controlForm=new frmControl(this);
- controlForm.Show();
- }
- public class frmControl:Form //子窗体,用来控制主窗体的某些显示!
- {
- private frmMain mainForm;
- public frmControl(frmMain mainForm)
- {
- this.mainForm=mainForm;
- }
- private void button1_Click(object sender,EventArgs e)
- {
- frmMain.textBox1.Text=this.textBox1.Text; //把子窗体的文本框值传递给主窗体的文本框!
- }
- }
2,我个人感觉上面的方法不是很好,虽然实现起来很简单,只是想改变窗体的标题文本,就把整个主窗体的引用都传递给子窗体,这样的方式不是很幽雅,我们用接口来改进上面的方法,这样可以限制暴露给子窗体的功能,降低窗体之间的耦合度:
- public interface IChangeTitle:
- {
- void ChangeTitle(string title);
- }
- public class frmMain:Form,IChangeTitle
- {
- ...
- frmControl controlForm=new frmControl(this);
- controlForm.Show();
- public void ChangeTitle(string title)
- {
- this.Text=title;
- }
- }
- public class frmControl:Form //子窗体,用来控制主窗体的某些显示!
- {
- private IChangeTitle ichangeTitle;
- public frmControl(IChangeTitle ichangeTitle)
- {
- this.ichangeTitle=ichangeTitle;
- }
- private void button1_Click(object sender,EventArgs e)
- {
- ichangeTitle.ChangeTitle(this.textBox1.Text); //通过接口来调用方法
- }
- }
3,为了进一步降低窗体之间的耦合度,我们可以用委托来实现这个需求:
- public partial class ChildForm : Form
- {
- public delegate void TitleChangedHandler(string title);
- public TitleChangedEventHandler TitleChanged;
- public ChildForm()
- {
- InitializeComponent();
- }
- private void btn_Ok_Click(object sender, EventArgs e)
- {
- if (TitleChanged != null)
- TitleChanged("Test Title"); //委托调用
- }
- }
主窗体给委托变量赋值就可以了:
- public partial class MainForm : Form
- {
- private ChildForm loginForm = new ChildForm();
- public MainForm()
- {
- InitializeComponent();
- loginForm.TitleChanged = new ChildForm.TitleChangedEventHandler(FormTitleChanged);
- }
- protected void FormTitleChanged(string title)
- {
- this.Text = title;
- }
- private void button1_Click(object sender, EventArgs e)
- {
- loginForm.Show();
- }
- }
4,也可以在子窗体中定义一个自定义的事件,然后自定义一个事件参数,用来传递你想传递的一些信息:
- public partial class ChildForm : Form
- {
- public class TitleChangedEventArgs : EventArgs //事件参数类
- {
- private string title = "";
- public string Title
- {
- get
- {
- return title;
- }
- set
- {
- title = value;
- }
- }
- }
- public delegate void TitleChangedEventHandler(object sender, TitleChangedEventArgs e);
- public event TitleChangedEventHandler TitleChanged;
- public ChildForm()
- {
- InitializeComponent();
- }
- private void btn_Ok_Click(object sender, EventArgs e)
- {
- TitleChangedEventArgs e1=new TitleChangedEventArgs();
- e1.Title="Login sucessed";
- OnTitleChanged(e1);//触发事件
- }
- protected virtual void OnTitleChanged(TitleChangedEventArgs e) //触发事件的方法
- {
- if (TitleChanged != null)
- TitleChanged(this, e);
- }
- }
主窗体订阅这个事件就可以了:
- public partial class MainForm : Form
- {
- private ChildForm loginForm = new ChildForm();
- public MainForm()
- {
- InitializeComponent();
- loginForm.TitleChanged += new ChildForm.TitleChangedEventHandler(FormTitleChanged);
- }
- protected void FormTitleChanged(object sender, ChildForm.TitleChangedEventArgs e)
- {
- this.Text = e.Title;
- }
- private void button1_Click(object sender, EventArgs e)
- {
- loginForm.Show();
- }
- }