检查可观察集合是否为空！时间：2019-03-17 标签：c#
想要检查名为 PlayerProfile
if ((App.ViewModel.PlayerProfile.Count != 0))
{
// remove stored PlayerProfile
}
Anyideas 的可观察集合中是否有 ant Items ？
gettign 一个空错误（即使有
App.ViewModel.PlayerProfile 是一个可观察的包含玩家的集合，
我只想检查它是否为空，如果不删除或清除
want to check if there are ant Items in an observable collection named PlayerProfile
if ((App.ViewModel.PlayerProfile.Count != 0))
{
// remove stored PlayerProfile
}
Anyideas ??
gettign a null error (even though there are
App.ViewModel.PlayerProfile is an oberservable collection containg players
i just want to check to see if its empty and if not delete or clear
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如果您收到 null 错误，则存在三种可能性：
App为 null（极不可能）App.ViewModel可能为 null。ViewModel上的PlayerProfile属性可能为 null。我建议确保在 ViewModel 的所有构造函数中构造
PlayerProfile，并且此时您的 ViewModel 已构造完毕，因为这些是最有可能的罪魁祸首。最有可能的是，该例程在初始化方法之前被调用，这就是此时未设置这些例程的原因。If you're getting a null error, there are three possibilities:
Appis null (very unlikely)App.ViewModelcould be null.PlayerProfileproperty onViewModelmay be null.I suggest making sure that
PlayerProfileis being constructed in all constructors of your ViewModel, and that your ViewModel has been constructed at this point, as those are the most likely culprits. Most likely, this routine is being called prior to your initialization methods, which is why these are unset at this point.Count属性将返回集合中元素的数量。但是，如果您收到 null 错误，则意味着某些内容为 null。
The
Countproperty will return the number of elements in the collection.However, if you're getting a null error, that means something is null.
App、ViewModel或PlayerProfile为null。Either
App,ViewModelorPlayerProfileisnull.