Question

在我的项目＆＃34; teacher_gui_windows_form＆＃34;我试图将我从工具箱中创建的userControl拖到我的表单＆＃34; teacher_gui＆＃34;但它给了我错误：＆＃34;无法创建组件＆＃39; StudentControl＆＃39;。错误消息如下：System.MissingMethodException类型＆＃39; teacher_gui_windows_form.StudentControl＆＃39;上的构造函数没找到。＆＃34;

但我确实有一个StudentControl构造函数。 StudentControl类使用另一种形式，这是它的类代码：

public partial class StudentControl : UserControl
{
    const int Num = 10;
    Image image;
    string message;
    public StudentForm studentForm = null;

    public StudentControl(Image image, string Ip, int index)
    {
        InitializeComponent();
        this.image = image;
        pictureBoxImage.Image = image;
        labelIp.Text = Ip;
        Location = new Point(index % Num * (Width + 5), index / Num * (Height + 5));
    }

    public void ChangeImage(Image image)
    {
        pictureBoxImage.Image = image;
    }

    private void StudentControl_Click(object sender, EventArgs e)
    {
        studentForm = new StudentForm(pictureBoxImage.Image);
        studentForm.ShowDialog();
    }

    private void pictureBoxImage_Click(object sender, EventArgs e)
    {
        studentForm = new StudentForm(pictureBoxImage.Image);
        studentForm.ShowDialog();
    }

    private void labelIp_Click(object sender, EventArgs e)
    {
        studentForm = new StudentForm(pictureBoxImage.Image);
        studentForm.ShowDialog();
    }

    private void seizeToolStripMenuItem_Click(object sender, EventArgs e)
    {

    }

    private void sendMessageToolStripMenuItem_Click(object sender, EventArgs e)
    {

    }
}

有谁知道为什么会这样？谢谢！

Answer 1

要创建UserControl的实例，Windows窗体设计器需要无参数构造函数。它对当前构造函数所需的参数（Image image, string Ip, int index）一无所知，也不会自动生成虚假值。

无法以Windows窗体创建组件userControl：

1 个答案: