如果占用用户界面线程,为什么Windows CE会删除关键事件?

现在我很欣赏这个故事的寓意是“不要占用用户界面线程”,但我们试图通过尽可能长时间地保持用户界面线程上的内容来亲吻,但我认为我们已经达到了临界点,我们将不得不改变我们的设计。

但是无论如何……我在我们的设备上注意到了一些桌面上不会发生的事情:当你霸占用户界面线程时,它会掉钥匙。这里有一个显示问题的非常简单的应用程序。

using System;
using System.Windows.Forms;

namespace DeviceApplication14
{
    public partial class Form1 : Form
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [MTAThread]
        static void Main()
        {
            Application.Run(new Form1());
        }

        private int ctr;

        public Form1()
        {
            InitializeComponent();
            KeyPreview = true;
            KeyDown += Form1_KeyDown;
        }

        void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            for (int i = 0; i < 1000000; i++)
            {

            }
            ctr++;
            button1.Text = ctr.ToString();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            ctr = 0;
            button1.Text = ctr.ToString();
        }

        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.button1 = new System.Windows.Forms.Button();
            this.button2 = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(235, 137);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(329, 239);
            this.button1.TabIndex = 0;
            this.button1.Text = "button1";
            // 
            // button2
            // 
            this.button2.Location = new System.Drawing.Point(62, 291);
            this.button2.Name = "button2";
            this.button2.Size = new System.Drawing.Size(72, 20);
            this.button2.TabIndex = 1;
            this.button2.Text = "Clear";
            this.button2.Click += new System.EventHandler(this.button2_Click);
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(96F, 96F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Dpi;
            this.AutoScroll = true;
            this.ClientSize = new System.Drawing.Size(638, 455);
            this.Controls.Add(this.button2);
            this.Controls.Add(this.button1);
            this.Name = "Form1";
            this.Text = "Form1";
            this.ResumeLayout(false);

        }

        #endregion

        private Button button1;
        private Button button2;
    }
}

当我在自定义框上运行这个命令时,我可以连续按四个键,但我的ctr只会增加两个。如果我添加一些零(以补偿桌面的更快速度),然后在桌面上运行它,我会得到所有的键。

这是怎么回事?