Question

我已经声明了一个名为// Usuario.cs public string Message { get; set; } ... Silabas silabas = new Silabas(this); // Silabas.cs public Silabas(Usuario usuario) { // Here you can access the usuario.Message }的类，其中每个实例都有自己继承自SubjectRow的控件：

System.Windows.Forms.Control

在我的public class SubjectRow : Control { static int counter = 0; public ComboBox subjectBox = new ComboBox(); public Label maxBox = new Label(); public TextBox nBox = new TextBox(); public TextBox aBox = new TextBox(); public TextBox mBox = new TextBox(); public TextBox eBox = new TextBox(); public TextBox cBox = new TextBox(); public SubjectRow() { counter++; subjectBox.Location = new Point(100, 300); } }方法中，您可以看到我尝试使用SubjectRow()在表单上显示ComboBox subjectBox。但是，这没有任何作用，表单在运行时仍然是空白的。

我对C＃很陌生，但我的理解是每当创建new Point(left, top)的新实例时都会运行SubjectRow()方法。那为什么这不起作用？如何在指定位置的表单上显示class SubjectRow控件？

Answer 1

你告诉你有一个表单，所以你应该将form参数添加到构造函数中;

public SubjectRow (Form f)
{
    counter++;
    subjectBox.Location = new Point(100, 300);
    f.Controls.Add(subjectBox);
}

在后面的代码中，创建一个这样的实例。

SubjectRow test= new SubjectRow (this);

希望有所帮助，

Answer 2

Control未实现UserControl

以下是正确的做法

<强> MyUserControl.cs：

using System.Windows.Forms;

namespace ControlTest
{
    public partial class MyUserControl : UserControl
    {
        public MyUserControl()
        {
            InitializeComponent();
        }

        private void InitializeComponent()
        {
            this.txtName = new System.Windows.Forms.TextBox();
            this.lblName = new System.Windows.Forms.Label();
            this.SuspendLayout();
            // 
            // txtName
            // 
            this.txtName.Location = new System.Drawing.Point(107, 18);
            this.txtName.Name = "txtName";
            this.txtName.Size = new System.Drawing.Size(305, 20);
            this.txtName.TabIndex = 0;
            // 
            // lblName
            // 
            this.lblName.AutoSize = true;
            this.lblName.Location = new System.Drawing.Point(22, 23);
            this.lblName.Name = "lblName";
            this.lblName.Size = new System.Drawing.Size(35, 13);
            this.lblName.TabIndex = 1;
            this.lblName.Text = "Name";
            // 
            // MyUserControl
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.Controls.Add(this.lblName);
            this.Controls.Add(this.txtName);
            this.Name = "MyUserControl";
            this.Size = new System.Drawing.Size(433, 57);
            this.ResumeLayout(false);
            this.PerformLayout();

        }

        private System.Windows.Forms.TextBox txtName;
        private System.Windows.Forms.Label lblName;
    }
}

在您的表单中，添加用户控件：

using System.Windows.Forms;

namespace ControlTest
{
    public partial class Form1 : Form
    {
        private MyUserControl myUserControl1;

        public Form1()
        {
            InitializeComponent();
            this.myUserControl1.Location = new System.Drawing.Point(12, 12);
            this.myUserControl1.Name = "myUserControl1";
            this.myUserControl1.Size = new System.Drawing.Size(433, 57);
            this.myUserControl1.TabIndex = 0;

        }
    }
}

Answer 3

快速而肮脏的样本：

public partial class SubjectRow : UserControl
  {
    private ComboBox comboBox1;
    private Label label1;
    private TextBox textBox1;
    private TextBox textBox2;
    private TextBox textBox3;
    private TextBox textBox4;
    private TextBox textBox5;

    public SubjectRow()
    {
      InitializeComponent();

      comboBox1 = new ComboBox();
      label1 = new Label();
      textBox1 = new TextBox();
      textBox2 = new TextBox();
      textBox3 = new TextBox();
      textBox4 = new TextBox();
      textBox5 = new TextBox();

      Controls.Add(textBox5);
      Controls.Add(textBox4);
      Controls.Add(textBox3);
      Controls.Add(textBox2);
      Controls.Add(textBox1);
      Controls.Add(label1);
      Controls.Add(comboBox1);
    }
  }

Answer 4

public SubjectRow (Form f, int pointX=100, int pointY=300)
{
    counter++;
    subjectBox.Location = new Point(pointX, pointY);
    f.Controls.Add(subjectBox);
}

SubjectRow test= new SubjectRow (this,100,300); // You can control position of every control

将控件添加到新类

4 个答案: