Question

我正在尝试移动位于Form1中的所有标签。我可以移动一个特定的标签，但如何循环和移动所有标签？感谢您的帮助和建议。

移动特定标签：

label1.Location = new Point(0, 0);

这不起作用：

Form1 f1 = new Form1();
for (int i = 0; i < f1.Controls.Count; i++)
{
    f1.Controls[i].Location = new Point(0, 0);
{

Answer 1

您可以遍历所有控件，但是您需要检查它是什么类型的控件，以查看它是否实际上是一个标签。以下代码应该有效，如果as实际上不是标签，则labelControl关键字将导致ctrl为空

//Form1 f1 = new Form1(); // Removed, using this means you're calling from within the control you want to change already.
foreach (var ctrl in this.Controls)
{
    var labelControl = ctrl as Label;
    if (labelControl == null)
    {
        continue;
    }

    labelControl.Location = new Point(0, 0);
}

Answer 2

您可以使用is限定符来确定控件是否确实是标签

//Form1 f1 = new Form1(); as pointed out this is not needed your are already on the right instance. doing new creates a new instance
for (int i = 0; i < Controls.Count; i++)
{
    if (Controls[i] is Label){
        Controls[i].Location = new Point(0, 0);
    }
}

应该做的伎俩

如何在C＃Winforms中以编程方式移动Form1中的所有标签

2 个答案: