c# - 检测Form中其他类ComboBox的变化

Question

我想检测 ComboBox selectedindex 的变化。组合框与 Form 类位于不同的类中：

class Analyze
    {
        public Analyze(Form theform)
        {
            size = new ComboBox();
            size.Location = new Point(100,100);
            size.Name = "matrixsize";
            size.Size= new Size(200,100);
            size.Items.AddRange(matrix_sizes);
            theform.Controls.Add(size);
        }
        private string[] matrix_sizes = { "1", "2", "3", "4", "5", "6", "7", "8", "9", "0" };
        private ComboBox size;
    }

我在这里创建了一个分析类型的新对象：

private void Analyze_Click(object sender, EventArgs e)
{
    Analyze analyze = new Analyze(this);
}

现在我想检测Analyze.size中值的变化，我该怎么做？访问大小组合框的正确方法是什么？

提前致谢。

Answer 1

只需添加您自己的处理程序：

class Analyze {
  public event EventHandler SelectedIndexChanged;

  public Analyze(Form theform) {

    ...
    size.SelectedIndexChanged += size_SelectedIndexChanged;
    theform.Controls.Add(size);
  }

  void size_SelectedIndexChanged(object sender, EventArgs e) {
    if (SelectedIndexChanged != null) {
      SelectedIndexChanged(sender, e);
    }
  }
}

然后在调用表单上存根您的事件：

private void Analyze_Click(object sender, EventArgs e)
  Analyze analyze = new Analyze(this);
  analyze.SelectedIndexChanged += analyze_SelectedIndexChanged;
}

void analyze_SelectedIndexChanged(object sender, EventArgs e) {
  // do something
}