我有一个对象“ConnectableProperty”,将一个属性挂钩到另一个属性,并要求我给它提供Func。现在我有2种类型 - 标量和颜色。两者都可以通过明确的操作符相互转换。由于某些原因,我无法提供Func<double, double, Scalar>
到Func<double, double Color>
,即使标量可以投射到彩色。这是怎么回事?匿名方法返回类型铸造
为了澄清,我添加了代码。请注意,可连接属性是“输入”。输出(可以插入)是具有该签名的方法。
这里的ConnectableProperty
public sealed class ConnectableProperty<T> : IEquatable<T>, IGetXY<T> where T : IValue<T>
{
private T _value;
public T Value { get { return _value; } set { _value = value; } }
public INode ParentNode { get; private set; }
public ValueConnection<T> Connection { get; set; }
public INode ConnectionFrom { get { return !IsConnected ? null : Connection.FromNode; } }
public bool IsConnected { get { return Connection == null; } }
public ConnectableProperty(INode parentNode, T value)
{
ParentNode = parentNode;
_value = value;
}
public T GetXY(double x, double y)
{
return IsConnected
? Connection.FromValue(x, y)
: _value;
}
public void Connect(INode fromNode, Func<double, double, T> getXY)
{
Connection = new ValueConnection<T>(fromNode, ParentNode, getXY, this);
}
public void Disconnect()
{
Connection = null;
}
public bool Equals(T other)
{
return _value.Equals(other);
}
public static implicit operator T(ConnectableProperty<T> connectableProperty)
{
return connectableProperty._value;
}
}
而且ValueConnection:
public class ValueConnection<T>
{
public INode FromNode { get; private set; }
public INode ToNode { get; private set; }
public Func<double, double, T> FromValue { get; private set; }
public ConnectableProperty<T> ToValue { get; private set; }
public ValueConnection(INode fromNode, INode toNode, Func<double, double, T> fromValue, ConnectableProperty<T> toValue)
{
// TODO: Implement INPC type thing
FromNode = fromNode;
ToNode = toNode;
FromValue = fromValue;
ToValue = toValue;
}
}
你能举个例子吗?你现在怎么做? – 2011-06-13 12:13:20
你可以发布你的对象?如果只能明确表演,那么我不会看到Func如何工作。 – IndigoDelta 2011-06-13 12:13:45
也许如果有某种类型的继承,或者接口实现可以将标量func提供给颜色1,但不是这样的 – Atzoya 2011-06-13 12:16:21