asp.net C# winform 窗口传值与拖动实例

mousedown(object sender, mouseeventargs e)
mouseup(object sender, mouseeventargs e)
mousemove(object sender, mouseeventargs e)
这三个函数的作用分别是鼠标按下时激活，鼠标松开激活和鼠标移动
需要考虑的情况如下
1. 只有在鼠标按下的时候才可以使用鼠标移动事件
2. 鼠标移动的时候控件重新调整位置
为了有效控制第一个条件，所以可以将鼠标移动事件的绑定推迟到鼠标按下事件中，而不是在初始化时完成，另外要记录下初始状态下鼠标位于控件中的坐标，这里注意mouseeventargs参数中的x,y表示的是鼠标在当前控件中的layout坐标，而不是鼠标在主窗口中的坐标。

rivate void button1_mousedown(object sender, mouseeventargs e)
        {
            this.tmpx = e.x;
            this.tmpy = e.y;
            this.button1.mousemove += new system.windows.forms.mouseeventhandler(this.button1_mousemove);
        }
同时在鼠标送开事件中再将该方法绑定脱离
        private void button1_mouseup(object sender, mouseeventargs e)
        {
            this.button1.mousemove -= new system.windows.forms.mouseeventhandler(this.button1_mousemove);
        }
最后是mousemove事件
        private void button1_mousemove(object sender, mouseeventargs e)
        {
            this.button1.location = new system.drawing.point(this.button1.location.x + e.x - this.tmpx, this.button1.location.y + e.y - this.tmpy);
        }
这里重新计算了控件的新位置。
例子中使用了button作为实验对象并且额外定义了
        private int tmpx = 0;
        private int tmpy = 0;  

 

private int tmpx = 0; 

private int tmpy = 0; 

private void panel1_mousedown(object sender, mouseeventargs e) 

{ 

    if (e.button == mousebuttons.left) 

    { 

        this.tmpx = e.x; 

        this.tmpy = e.y; 

        this.panel1.cursor = cursors.sizeall; 

        this.panel1.mousemove += new mouseeventhandler(panel1_mousemove); 

    } 

} 

 

private void panel1_mouseup(object sender, mouseeventargs e) 

{ 

    this.panel1.cursor = cursors.default; 

    this.panel1.mousemove -= new mouseeventhandler(panel1_mousemove); 

} 

 

void panel1_mousemove(object sender, mouseeventargs e) 

{ 

    this.panel1.location = new point(this.panel1.location.x + e.x - this.tmpx, this.panel1.location.y + e.y - this.tmpy); 

}

看一个winform,showdialog,子窗体向父窗体传值

例子：
下面是子窗体代码，要求输入phone，然后会返回给父窗体。

using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.text;
using system.windows.forms;

namespace windowsapplication1
{
    public partial class phone : form
    {
        public phone()
        {
            initializecomponent();
            btnok.dialogresult = dialogresult.ok;
            btnok.dialogresult = dialogresult.cancel;
        }
        public string phonenumber
        {
            get { return textbox1.text; }
            set { textbox1.text = value; }
        }
        private void phone_load(object sender, eventargs e)
        {

        }
    }
}

不包含任何处理按钮单击事件的代码，因为设置了每个按钮的dialogresult属性，所以单击ok或者cancel按钮后，窗体就消失了。下面的代码显示了父窗体中调用phone对话框的方法。

using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.text;
using system.windows.forms;

namespace windowsapplication1
{
    public partial class form7 : form
    {
        public form7()
        {
            initializecomponent();
        }

        private void button1_click(object sender, eventargs e)
        {
            phone frm = new phone();
            frm.showdialog();
            if (frm.dialogresult == dialogresult.ok)
            {
                label1.text = "phone number is " + frm.phonenumber;
               
            }
            else if (frm.dialogresult == dialogresult.cancel)
            {
                label1.text = "form was canceled";
              
            }
            frm.close();
        }
    }
}

看起来非常简单，创建新的phone对象frm，在调用frm.showdialog方法是，代码停止，等待phone窗体返回，接着检查phone窗体的dialogresult属性，由于窗体还没有释放，是不可见的，所以仍可以访问公共属性phonenumber，一旦获取了需要的数据，就可以嗲用窗体的close方法。
一切正常，但是如果返回的格式不正确怎么办，就要把showdialog方法放在循环中，就可以再次调用，让用户重新输入，就可以得到正确的值。

上面的代码改成下面的即可。

using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.text;
using system.windows.forms;

namespace windowsapplication1
{
    public partial class form7 : form
    {
        public form7()
        {
            initializecomponent();
        }

        private void button1_click(object sender, eventargs e)
        {
            phone frm = new phone();

            while (true)
            {
                frm.showdialog();
                if (frm.dialogresult == dialogresult.ok)
                {
                    label1.text = "phone number is " + frm.phonenumber;
                    if (frm.phonenumber.length == 8 || frm.phonenumber.length == 12)
                    {
                        break;
                    }
                    else
                    {
                        messagebox.show("");
                    }
                }
                else if (frm.dialogresult == dialogresult.cancel)
                {
                    label1.text = "form was canceled";
                    break;
                }
            }
            frm.close();
        }
    }
}