C＃中删除动态创建的对象 [英] c# delete dynamically created objects

问题描述

我想删除所有动态创建的对象[在这种情况下，标签和trackbars]

I would like to remove all dynamically created object [ in this case, labels and trackbars ]

foreach (Label Labels in Controls.OfType<Label>())
{
    if (Labels.Tag.ToString() != "non-disposal"){
        Labels.Dispose();
    }
}

我想这一点，但我得到一个错误说对象引用未设置到对象的实例。

I tried this, but i get an error saying "Object reference not set to an instance of an object. "

感谢您，

解决方案

foreach (Label label in Controls.OfType<Label>()){

if (label.Tag != null && label.Tag.ToString() == "dynamic")
    label.Dispose();

由于lazyberezovsky

thanks to lazyberezovsky

推荐答案

添加到所有动态控制某些标签，例如： 动态。然后，处理它们是这样的：

Add to all dynamic controls some Tag, e.g. "dynamic". Then dispose them this way:

foreach (Label label in Controls.OfType<Label>())
{
    if (label.Tag != null && label.Tag.ToString() == "dynamic")
        label.Dispose();    
}

看起来有些标签没有标记分配。这就是为什么你有一个例外，试图调用的ToString（）在空。

Looks like some label do not have Tag assigned. That's why you've got an exception trying to call ToString() on null.

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