我如何使用UserControl？

Question

1. 开发者环境

   • 工具：Visual Studio 2017
   • 语言：C＃ - Windows窗体

2. 创建UserControl

   • testNext属性为Generic Type

   // ------- testControl.Designer.cs --------------------------------- -----

   partial class testTextBox<T>
   {
       private System.ComponentModel.IContainer components = null;
       protected override void Dispose(bool disposing)
       {
           if (disposing && (components != null))
           {
               components.Dispose();
           }
           base.Dispose(disposing);
       }
       private void InitializeComponent()
       {
           this.textBox1 = new System.Windows.Forms.TextBox();
           this.SuspendLayout();
           // textBox1
           this.textBox1.Location = new System.Drawing.Point(3, 2);
           this.textBox1.Name = "textBox1";
           this.textBox1.Size = new System.Drawing.Size(147, 21);
           this.textBox1.TabIndex = 1;
           this.textBox1.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.testTextBox_KeyPress);
           // testTextBox
           this.AutoScaleDimensions = new System.Drawing.SizeF(7F, 12F);
           this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
           this.Controls.Add(this.textBox1);
           this.Margin = new System.Windows.Forms.Padding(0);
           this.Name = "testTextBox";
           this.Size = new System.Drawing.Size(157, 26);
           this.Resize += new System.EventHandler(this.testTextBox_Resize);
           this.ResumeLayout(false);
           this.PerformLayout();
       }            
       private System.Windows.Forms.TextBox textBox1;
   }
   

   // ------- testControl.cs ----------------------------------- -----------------

   public partial class testTextBox<T> : UserControl
   {
       public delegate void DelegateKeyPress(object sender, KeyPressEventArgs e);
       public event DelegateKeyPress testKeyPress;  
       public testTextBox()
       {
           InitializeComponent();
       }
       public T _testNext;  // Generic property
       public T testNext
       {
           get
           {
               return this._testNext;
           }
           set
           {
               this._testNext = value;
           }
       }
       private void testTextBox_KeyPress(object sender, KeyPressEventArgs e)
       {
           if (this._testNext != null)
           {
               MessageBox.Show(this._testNext.GetType().Name);
           }
           if (this.testKeyPress != null)
           {
               this.testKeyPress(sender, e);
           }
       }
   }
   

3. 使用testTextBox

   • 我想在表单中使用testTextBox，但我不能在设计模式下使用它 我如何使用testTextBox？

Answer 1

1.确保usercontrol和mainform具有相同的命名空间。

1. 构建解决方案

2. 双击testControl.cs以打开设计窗口。

3. 转到工具箱，找到** Comopnets（**是您的项目名称）

4. 您的用户控件就在那里。只需添加和使用。