无法解析符号 T
我对 ObservableCollection 类有疑问。 我无法解决这个问题。
using System.Collections.ObjectModel;
#region ViewModelProperty: CustomerList
private ObservableCollection<T> _customerList = new ObservableCollection<T>();
public ObservableCollection<T> CustomerList
{
get
{
return _customerList;
}
set
{
_customerList = value;
OnPropertyChanged("CustomerList");
}
}
#endregion
我的 ObservableCollection 类继承了 ViewModelBase：
public abstract class ViewModelBase : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
知道吗，问题出在哪里？
I have a problem with ObservableCollection Class. I cant resolve this.
using System.Collections.ObjectModel;
#region ViewModelProperty: CustomerList
private ObservableCollection<T> _customerList = new ObservableCollection<T>();
public ObservableCollection<T> CustomerList
{
get
{
return _customerList;
}
set
{
_customerList = value;
OnPropertyChanged("CustomerList");
}
}
#endregion
My class with the ObservableCollection inherits ViewModelBase:
public abstract class ViewModelBase : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
any idea, where is the problem?
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评论（3）
T只是一个占位符。 您需要在某处为T提供实际类型。例如，如果您有
List，则可以创建List或List(Tcode> 是符合给定约束的任何其他类型）。 即，在第一种情况下，T是int，在第二种情况下，T是string。Tis just a placeholder. You need to supply an actual type somewhere forT.E.g. if you have
List<T>, you could make aList<int>orList<string>(Tis any other type which fits the given constraints). I.e.Tisintin the first case andstringin the second.我认为当您阅读一点 泛型< /a>
您可以这样做：
然后，您有一个类型化集合，它将能够存储 Customer 类的实例（以及从 Customer 继承的子类的实例）。
因此，如果您想要一个能够添加多种类型实例的集合，您可以创建一个基类（或接口），并从该基类继承或实现此接口，然后创建一个 ObservableCollection例如，前。
I think that it will become clear to you when you read up a bit on Generics
You could do it like this:
Then, you have a typed collection which will be able to store instances of the Customer class (and also instances of subclasses that inherit from Customer).
So, if you want to have a collection where you want to be able to add instances of multiple types, you could create a base-class (or interface), and inherit from that base-class or implement this interface, and create an ObservableCollection instance for ex.
如前所述，T 是占位符。 你可能想要这样的东西：
As previously posted, T is a placeholder. You probably want something like: