Question

当我在数据库上搜索时，我使用下面的代码在panel1上创建多个新标签。如果我在数据库中删除一个名字，是否有机会删除标签？

public void labelLocate(string name, string labelLocate, int x, int y)
{
    // name is the ID in the database
    var label = this.Controls.OfType<Label>().FirstOrDefault(l => l.Name == name);
    if (label != null) this.Controls.Remove(label);
    Label labelstring = new Label();
    labelstring.Width = 0;
    labelstring.Text = name;
    labelstring.Name = name;            
    labelstring.AutoSize = true;
    this.Controls.Remove(labelstring);
    this.Controls.Add(labelstring);
    labelstring.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
    labelstring.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
    labelstring.BringToFront();

    switch (labelLocate)
    {
        case "Up": labelstring.Location = new Point(x + (panel1.Location.X + 3), (y - 20) + (panel1.Location.Y + 3));
            break;
        case "Down": labelstring.Location = new Point(x + (panel1.Location.X + 3), (y) + 5 + (panel1.Location.Y + 3));
            break;
        case "Left": labelstring.Location = new Point(x - 5 - (labelstring.Width) + (panel1.Location.X + 3), y + 5 + (panel1.Location.Y + 3));
            break;
        case "Right": labelstring.Location = new Point(x + 10 + (panel1.Location.X + 3), y + 5 + (panel1.Location.Y + 3));
            break;
    }
}

Answer 1

您可以使用ControlCollection.Remove和LINQ：

var label = this.Controls.OfType<Label>().FirstOrDefault(l => l.Name == "TheID");
if(label != null)
    this.Controls.Remove(label);

Answer 2

找到你的控件，然后：

if(label != null)
          label.Dispose();

Answer 3

您可以使用以下代码更轻松地删除标签：

this.Controls.Remove(label1);。

this是当前形式。 Controls是位于表单上的标签，按钮等。 Remove()删除目标控件。

c＃以编程方式创建后删除标签

3 个答案: