如果你定义一个只有一个getter的接口的接口(= VBO中的ReadOnly),你为什么要在用C#实现类而不是用VB实现类时定义setter？
我原以为它是在.NET级别定义的,而不是特定于语言的.
示例：对于此接口
'VB.NET
Interface SomeInterface
'the interface only say that implementers must provide a value for reading
ReadOnly Property PublicProperty As String
End Interface
要么
//C# code
interface IPublicProperty
{
string PublicProperty { get; }
}
这是C#中的正确实现：
public class Implementer:IPublicProperty
{
private string _publicProperty;
public string PublicProperty
{
get
{
return _publicProperty;
}
set
{
_publicProperty = value;
}
}
}
但这在VB.NET中无效
Public Property PublicProperty As String Implements SomeInterface.PublicProperty
Get
Return _myProperty
End Get
Set(ByVal value As String)
_myProperty = value
End Set
End Property
更新2015/04/23
原来这个功能是VB14的一部分！
见Languages features in C# 6 and VB 14和New Language Features in Visual Basic 14：
ReadOnly interface properties can be implemented by ReadWrite props
This cleans up a quirky corner of the language. Look at this example:06004
PrevIoUsly,if you were implementing the ReadOnly property I.P,then
you had to implement it with a ReadOnly property as well. Now that
restriction has been relaxed: you can implement it with a read/write
property if you want. This example happens to implement it with a
read/write autoprop,but you can also use a property with getter and
setter.
因为VB.NET要求实现接口成员以具有该Implements子句,所以说明它正在实现哪个成员. C#允许您显式实现接口成员(类似于VB.NET的SORT OF),或隐式实现(没有VB.NET等效).因此,实际的C#版本是
public class Implementer : IPublicProperty
{
private string _publicProperty;
string IPublicProperty.PublicProperty // explicit implementation
{
get
{
return _publicProperty;
}
set
{
_publicProperty = value;
}
}
}
这确实给出了一个错误：
error CS0550: ‘ConsoleApplication171.Implementer.ConsoleApplication171.IPublicProperty.PublicProperty.set’ adds an accessor not found in interface member ‘ConsoleApplication171.IPublicProperty.PublicProperty’