我必须根据名为“descripcio”的字符串[]创建表单中的标签 . “descripcio”的每个参数对应于新标签 . 每个标签需要三个事件,MouseDown,MouseUp和MouseMove . 所有标签都有相同的事件 . 代码是:
public FormEquip(string[] descripcio)
{
InitializeComponent();
this.descripcio = descripcio;
inicialitza_descripcions();
}
private void inicialitza_descripcions()
{
for (int i = 0; i < this.descripcio.Length; ++i)
{
System.Windows.Forms.Label Label = new System.Windows.Forms.Label();
crea_label(ref Label2, 100, 50 * (i + 1), "D" + i, this.descripcio[i], 2 * i + 2);
this.Controls.Add(Label);
}
}
private void crea_label(ref System.Windows.Forms.Label Label, int x, int y, string nom, string text, int index)
{
Label.AutoSize = true;
Label.Font = new System.Drawing.Font("Microsoft Sans Serif", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
Label.Location = new System.Drawing.Point(x, y);
Label.Name = nom;
Label.TabIndex = index;
Label.Text = text;
Label.Visible = true;
Label.MouseDown += new System.EventHandler(Label_MouseDown);
Label.MouseUp += new System.EventHandler(Label_MouseUp);
Label.MouseMove += new System.EventHandler(Label_MouseMove);
}
private void Label_MouseDown(object sender, MouseEventArgs e)
{
this.isDragging = true;
}
private void Label_MouseUp(object sender, MouseEventArgs e)
{
this.isDragging = false;
}
private void Label_MouseMove(object sender, MouseEventArgs e)
{
Control ctrl = sender as Control;
if (this.isDragging)
{
Point p1 = ctrl.PointToScreen(e.Location);
Point p2 = ctrl.Parent.PointToClient(p1);
ctrl.Location = p2;
}
}
此代码生成“无重载”Label_MouseDown / Label_MouseUp / Label_MouseMove“匹配委托'system.eventhandler'”这三行中的错误:
Label.MouseDown += new System.EventHandler(Label_MouseDown);
Label.MouseUp += new System.EventHandler(Label_MouseUp);
Label.MouseMove += new System.EventHandler(Label_MouseMove);
第一行“没有重载”Label_MouseDown“匹配委托'system.eventhandler'” . 第二行“没有重载”Label_MouseUp“匹配委托'system.eventhandler'” . 第三行“没有重载”Label_MouseMove“匹配委托'system.eventhandler'” .
在撰写这篇文章之前,我已经看过几篇有类似错误消息的帖子 . 我试着按照我在帖子中读到的解释,但我无法得到解决方案 . 谢谢大家 .
编辑:
最后,我只需要更改这部分代码:
Label.MouseDown += new System.EventHandler(Label_MouseDown);
Label.MouseUp += new System.EventHandler(Label_MouseUp);
Label.MouseMove += new System.EventHandler(Label_MouseMove);
对于:
Label.MouseDown += new System.Windows.Forms.MouseEventHandler(Label_MouseDown);
Label.MouseUp += new System.Windows.Forms.MouseEventHandler(Label_MouseUp);
Label.MouseMove += new System.Windows.Forms.MouseEventHandler(Label_MouseMove);
就这样 . 谢谢HuorSwords .
1 回答
您的
Label_MouseDown
,Label_MouseUp
和Label_MouseMove
未实现System.EventHandler
contract,必须是:此外,您必须将
EventArgs
参数强制转换为MouseEventArgs
才能将其用于您的方法(实际上您只将它用于Label_MouseMove
方法) .