C# widget

时间:2020-12-29 08:21:35

Invoke(Delegate)的用法:

//例如,要实时update窗体。如果在另一个线程中update,那么可以直接update(可以不在新线程中);也可以在Delegate中给出upate,然后invoke调用(但是invoke必须在另一线程中)
//区别在于invoke是同步的(在此处,同步是啥意思)
//参数Delegate拥有某个窗体句柄的控制权,即Delegate是在窗体类中定义的 —— 故update操作应在Delegate中
//invoke应该在另一个线程中调用;返回值为Delegate的返回值
class MyFormControl : Form
{
public delegate void AddListItem();
public AddListItem myDelegate;
private Thread myThread; public MyFormControl()
{
myDelegate = new AddListItem(AddListItemMethod); myThread = new Thread(new ThreadStart(ThreadFunction));
myThread.Start();
}
public void AddListItemMethod()
{
//update
}
private void ThreadFunction()
{
MyThreadClass myThreadClassObject = new MyThreadClass(this);
myThreadClassObject.Run();
}
}
class MyThreadClass
{
MyFormControl myFormControl1;
public MyThreadClass(MyFormControl myForm)
{
myFormControl1 = myForm;
}
public void Run()
{
myFormControl1.Invoke(myFormControl1.myDelegate);
//myFormControl1.myDelegate();
}
}

主要采用纯手写代码,生成窗体界面的方式(偶尔也可能拖控件)。

空工程创建一个窗体(但是现在是先弹出控制台——想办法去掉):

using System.Drawing;
using System.Windows.Forms; namespace Project1
{
class MyFormControl : Form
{
public MyFormControl()
{
ClientSize = new Size(, );
Text = "Custom Widget";
}
static void Main()
{
MyFormControl myForm = new MyFormControl();
myForm.ShowDialog();
}
}
}

Button的创建及响应事件(下面的就不AddRange了):

//基于刚才的工程,在构造函数中新建一个button
//Location、Size、TabIndex、Text、EventHandler
myButton = new Button();
myButton.Location = new Point(, );
myButton.Size = new Size(, );
myButton.TabIndex = ;
myButton.Text = "Add items in list box";
myButton.Click += new EventHandler(Button_Click); Controls.AddRange(new Control[] { myButton });

ListBox的创建及用法:

myListBox = new ListBox();
myListBox.Location = new Point(, );
myListBox.Name = "myListBox";
myListBox.Size = new Size(, );
myListBox.TabIndex = ; //添加项
string myItem = "";
myListBox.Items.Add(myItem);
myListBox.Update();