用户控制自定义事件和设置get属性

本文关键字：设置 get 属性 事件 控制 自定义 用户 | 更新日期: 2023-09-27 18:02:05

我有两个标签和一个属性在用户控制:下面是属性:

private int _SelectIndex;
[Browsable(true)]
public int SelectIndex { get; set; }

和2个标签:

Label lbl1, lbl2;
void iControl()
{
      lbl1 = new Label();
      lbl2 = new Label();
      lbl1.Name = "lbl1";
      lbl2.Name = "lbl2";
      lbl1.Click += lbl_Click;
      lbl2.Click += lbl_Click;
      this.Controls.Add(lbl1);
      this.Controls.Add(lbl2);
}
点击

: 

void lbl_Click(object sender, EventArgs e)
{
    Label selectedlbl = sender as Label;
    if(selectedlbl.Name == "lbl1") 
          this.Select = 1;
    else
          this.Select = 2;
}
类事件:

public class SelectEventArgs : EventArgs
{
  private int index;
  public SelectEventArgs(int index)
  {
     this.index = index;
  }
  public int ItemIndex
  {
    get
    {
      return index;
    }
  }
}

自定义事件在我的控制:

public event EventHandler SelectEvent;
protected virtual void OnSelectEvent()
{
  if (SelectEvent!= null)
    SelectEvent(this, new SelectEventArgs(this._SelectIndex));
}

我需要一个事件来获取和设置MainForm中的属性值，如下所示:

int index = 0;
public Form1()
{
  InitializeComponent();
  this.icontrol = new iControl();
  this.SelectEvent += Select();
}
void Select(object sender, SelectItem e)
{
   //use this to set value of Select
   this.icontrol.SelectIndex = index;
   //and this to get value of Select
   index = this.icontrol.SelectIndex;
}

Select为空。如何让它工作?

用户控制自定义事件和设置get属性

我贴在这里给任何需要的人:
1.声明委托:

public delegate void SelectIndexEventHandler(object sender, SelectEventArgs e);
public class SelectEventArgs : EventArgs
{
  private int index;
  public SelectEventArgs(int index)
  {
    this.index = index;
  }
  public int ItemIndex
  {
    get { return index; }
    set { index = value; }
  }
}

2。声明事件SelectIndexChanged和方法OnSelectIndexChanged:

public event SelectIndexEventHandler SelectIndexChanged;
protected virtual void OnSelectIndexChanged(SelectEventArgs e)
{
   if (SelectIndexChanged != null)
      SelectIndexChanged(this, e);
}

3。在setter中调用它:

public int SelectIndex
{
   get { return _SelectIndex; }
   set { 
     _SelectIndex = value;
     OnSelectIndexChanged(new SelectEventArgs(value)); 
   }
}

然后是MainForm:

this.gListBox1.SelectIndexChanged += icontrol_SelectIndexChanged;
void icontrol_SelectIndexChanged(object sender, SelectEventArgs e)
{
   var current = e.ItemIndex;
}

再次感谢jbmintjb Reza Aghaei。

代码有多个问题。考虑以下技巧来解决这些问题:

  1. SelecetEvent不属于Form。事件属于icontrol。

  2. this.SelectEvent += Select();是不正确的，你应该使用:

    icontrol.SelectEvent += Select;

  3. 当你有一个自定义事件参数时，你应该这样定义事件:

    public event EventHandler<SelectEventArgs> SelectEvent;

  4. 你应该使用你创建的OnSelectEvent方法在属性的setter中引发事件。

要了解更多关于事件的知识，请看c#处理和引发事件。

看一下列表框控件上的SelectedIndexChanged事件，认为这就是您正在寻找的

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