利用多线程句柄设置鼠标忙碌状态的实现方法

当我们在读取数据的时候，或者处理大量数据的时候可能需要把鼠标设置为忙碌状态，等待返回结果。下面的代码可以帮忙实现这点：

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

namespace cursorthread
{
    public partial class form1 : form
    {
        public delegate int dosomethingdelegate(int data);

        public form1()
        {
            initializecomponent();
        }

        static int dosomething(int data)
        {
            /// <sumary>
            /// do something in this method
            /// </sumary>
            thread.sleep(300);
            return data++;

        }

        private void button1_click(object sender, eventargs e)
        {
            this.cursor = cursors.default;

            dosomethingdelegate d = dosomething;
            iasyncresult ar = d.begininvoke(100,null, null);

            while (true)
            {
                this.cursor = cursors.waitcursor;
                if(ar.asyncwaithandle.waitone(50, false))
                {
                    this.cursor = cursors.arrow;
                    break;
                }
            }

            //get the result
            int result = d.endinvoke(ar);
            messagebox.show(result.tostring());

        }
    }
}

这样在点击鼠标后，鼠标会变成忙碌状态一直等待dosomething这个方法调用结束，然后变回箭头状态。

当然你也可以这样：

// set the status of the cursor
this.cursor = cursor.busy;

// do something

// set the status of the cursor
this.cursor = cursor.arrow;

如果是在方法里面调用的话，不能使用this关键字，那你可以这样做：

private void method()
{   
         curosor.current = cursor.waitcursor;

         /// do something

         cursor.current = cursor.arrow;
}