有一道题完全不会,求大神帮助,明天就考试了T T
1.使用winform编程完成一个随机数生成器。2.要求用户从编辑框输入生成随机数的时间间隔
3.程序按照用户的输入,每时间间隔生成一个1-100之间的随机数,在界面中显示。
4.要求程序设置开始按钮与停止按钮,点击开始按钮开始生成,点击停止按钮不再生成新的随机数
using System; using System.Threading; using System.Windows.Forms; namespace WindowsFormsApplication1 { public partial class Form1 : Form { private System.Threading.Timer timer; private Random random; private SynchronizationContext context; public Form1() { InitializeComponent(); random = new Random(); timer = new System.Threading.Timer(CreadeRandom, null, Timeout.Infinite, Timeout.Infinite); context = SynchronizationContext.Current; } private void CreadeRandom(object obj) { context.Post((t) => { listBox1.Items.Add(random.Next(1, 101)); }, obj); } private void button1_Click(object sender, EventArgs e) { listBox1.Items.Clear(); listBox1.Items.Add("随机数生成开始!"); timer.Change(0, int.Parse(textBox1.Text)); } private void button2_Click(object sender, EventArgs e) { timer.Change(Timeout.Infinite, Timeout.Infinite); listBox1.Items.Add("随机数生成结束!"); } } }
namespace WindowsFormsApplication1 { partial class Form1 { /// <summary> /// 必需的设计器变量。 /// </summary> private components = null; /// <summary> /// 清理所有正在使用的资源。 /// </summary> /// <param name="disposing">如果应释放托管资源,为 true;否则为 false。</param> protected override void Dispose(bool disposing) { if (disposing && (components != null)) { components.Dispose(); } base.Dispose(disposing); } #region Windows 窗体设计器生成的代码 /// <summary> /// 设计器支持所需的方法 - 不要 /// 使用代码编辑器修改此方法的内容。 /// </summary> private void InitializeComponent() { this.components = new (); this.serialPort1 = new (this.components); this.label1 = new System.Windows.Forms.Label(); this.textBox1 = new System.Windows.Forms.TextBox(); this.button1 = new System.Windows.Forms.Button(); this.button2 = new System.Windows.Forms.Button(); this.listBox1 = new System.Windows.Forms.ListBox(); this.SuspendLayout(); // // label1 // this.label1.AutoSize = true; this.label1.Location = new System.Drawing.Point(22, 29); this.label1.Name = "label1"; this.label1.Size = new System.Drawing.Size(137, 12); this.label1.TabIndex = 0; this.label1.Text = "生成时间间隔(毫秒):"; // // textBox1 // this.textBox1.Location = new System.Drawing.Point(165, 26); this.textBox1.Name = "textBox1"; this.textBox1.Size = new System.Drawing.Size(100, 21); this.textBox1.TabIndex = 1; this.textBox1.Text = "1000"; // // button1 // this.button1.Location = new System.Drawing.Point(291, 24); this.button1.Name = "button1"; this.button1.Size = new System.Drawing.Size(75, 23); this.button1.TabIndex = 2; this.button1.Text = "开始"; this.button1.UseVisualStyleBackColor = true; this.button1.Click += new System.EventHandler(this.button1_Click); // // button2 // this.button2.Location = new System.Drawing.Point(372, 24); this.button2.Name = "button2"; this.button2.Size = new System.Drawing.Size(75, 23); this.button2.TabIndex = 3; this.button2.Text = "停止"; this.button2.UseVisualStyleBackColor = true; this.button2.Click += new System.EventHandler(this.button2_Click); // // listBox1 // this.listBox1.FormattingEnabled = true; this.listBox1.ItemHeight = 12; this.listBox1.Location = new System.Drawing.Point(39, 80); this.listBox1.Name = "listBox1"; this.listBox1.Size = new System.Drawing.Size(475, 340); this.listBox1.TabIndex = 4; // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(550, 453); this.Controls.Add(this.listBox1); this.Controls.Add(this.button2); this.Controls.Add(this.button1); this.Controls.Add(this.textBox1); this.Controls.Add(this.label1); this.Name = "Form1"; this.Text = "Form1"; this.ResumeLayout(false); this.PerformLayout(); } #endregion private serialPort1; private System.Windows.Forms.Label label1; private System.Windows.Forms.TextBox textBox1; private System.Windows.Forms.Button button1; private System.Windows.Forms.Button button2; private System.Windows.Forms.ListBox listBox1; } }