动态地将UserControl添加到buttonClick的面板上

Question

In my form I have a button and I want to add a user control to a panel each time it's clicked:

public partial class AddInstanceForm : MetroForm
{          
      private List<Material> material { get; set; }
      public AddInstanceForm()
      {
          InitializeComponent();
      }

      // get data from db for mycombobox which exit in MaterilControl
      private void AddInstanceForm_Load(object sender, EventArgs e)
      {
          using(DBContext db=new DBContext())
          {
              material = db.Materials.ToList();
          }
      }

      // This Attached to button click
      private void anotherMaterial_Click(object sender, EventArgs e)
      {         
          MaterialControl mc = new MaterialControl(material);
          this.SuspendLayout();

          panel1.Controls.Add(mc);     

          //EDIT
          this.Invalidate();
          this.Update();

          this.ResumeLayout(false);
      }
}

The problem is that just one user control is added to the panel, no matter how many times the button is clicked:

public partial class MaterialControl : UserControl
{
      private MaterialView _material;
      private List<Material> MaterialboData { get; set; }
      public MaterialView Material
      {
          get 
          {
              _material.Name=MaterialName.Text;
              _material.Quntity = MaterialQu.Text;
              _material.MaterialID = Convert.ToInt32(MaterialName.ValueMember);
              return _material;
          }
          set 
          {
              MaterialName.Text=value.Name;
              MaterialQu.Text = value.Quntity;
              MaterialName.ValueMember = Convert.ToString(_material.MaterialID);
          }
      }

      public MaterialControl(List<Material> Data)
      {
          _material = new MaterialView();
          this.MaterialboData = new List<Material>();
          this.MaterialboData = Data;
          InitializeComponent();
      }
}

Answer 1

如果没有专门用于这些控件的面板，则可以使用Dock Top代替，而不是将它们添加到新的顶部位置，这将使该面板自动为您布置控件。