namespace WindowsControl { partial class Form1 { /// <summary> /// 必需的设计器变量。 /// </summary> private System.ComponentModel.IContainer 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 - 不要修改 /// 使用代码编辑器修改此方法的内容。 /// </summary> private void InitializeComponent() { this.lbl2 = new System.Windows.Forms.Label(); this.btn1 = new System.Windows.Forms.Button(); this.button1 = new System.Windows.Forms.Button(); this.button2 = new System.Windows.Forms.Button(); this.SuspendLayout(); // // lbl2 // this.lbl2.AutoSize = true; this.lbl2.Location = new System.Drawing.Point(44, 169); this.lbl2.Name = "lbl2"; this.lbl2.Size = new System.Drawing.Size(55, 15); this.lbl2.TabIndex = 0; this.lbl2.Text = "label2"; // // btn1 // this.btn1.Location = new System.Drawing.Point(37, 247); this.btn1.Name = "btn1"; this.btn1.Size = new System.Drawing.Size(139, 36); this.btn1.TabIndex = 1; this.btn1.Text = "删除第一个控件"; this.btn1.UseVisualStyleBackColor = true; this.btn1.Click += new System.EventHandler(this.btn1_Click); // // button1 // this.button1.Location = new System.Drawing.Point(206, 247); this.button1.Name = "button1"; this.button1.Size = new System.Drawing.Size(103, 36); this.button1.TabIndex = 2; this.button1.Text = "设置标签2"; this.button1.UseVisualStyleBackColor = true; this.button1.Click += new System.EventHandler(this.button1_Click); // // button2 // this.button2.Location = new System.Drawing.Point(330, 247); this.button2.Name = "button2"; this.button2.Size = new System.Drawing.Size(164, 36); this.button2.TabIndex = 3; this.button2.Text = "显隐lable1"; this.button2.UseVisualStyleBackColor = true; this.button2.Click += new System.EventHandler(this.button2_Click); // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(8F, 15F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(524, 333); this.Controls.Add(this.button2); this.Controls.Add(this.button1); this.Controls.Add(this.btn1); this.Controls.Add(this.lbl2); this.Name = "Form1"; this.Text = "Form1"; this.Load += new System.EventHandler(this.Form1_Load); this.ResumeLayout(false); this.PerformLayout(); } #endregion private System.Windows.Forms.Label lbl2; private System.Windows.Forms.Button btn1; private System.Windows.Forms.Button button1; private System.Windows.Forms.Button button2; } }
using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace WindowsControl { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { this.Text = "控件演示"; //编程添加控件Label Label lbl = new Label(); lbl.Text = "用户名"; lbl.Name = "lb1"; lbl.Location = new Point(50, 50); this.Controls.Add(lbl); this.lbl2.Text = "第二个标签"; } private void btn1_Click(object sender, EventArgs e) { this.Controls.RemoveByKey("lb1"); } private void button1_Click(object sender, EventArgs e) { lbl2.Text = "The second lable"; } private void button2_Click(object sender, EventArgs e) { this.Focus(); //label1是编程添加,所以从控件集合中获得 Control[] controlArray = this.Controls.Find("lb1", false); if (controlArray != null && controlArray.Length > 0) { Label lbl = (Label)controlArray[0]; lbl.Visible = !lbl.Visible; } } } }