1
using
System;
2
using
System.Collections.Generic;
3
using
System.Linq;
4
using
System.Text;
5
6
namespace
EffectiveCSharpItem34
7
{
8
public
class
B2 { }
9
public
class
D2 : B2 { }
10
11
public
class
B
12
{
13
public
void
Foo(D2 parm)
14
{
15
Console.WriteLine(
"
In B.Foo
"
);
16
}
17
public
void
Bar(B2 parm)
18
{
19
Console.WriteLine(
"
In B.Bar
"
);
20
}
21
public
void
Foo2(IEnumerable
<
D2
>
parm)
22
{
23
Console.WriteLine(
"
In B.Foo2
"
);
24
}
25
}
26
27
public
class
D : B
28
{
29
public
void
Foo(B2 parm)
30
{
31
Console.WriteLine(
"
In D.Foo
"
);
32
}
33
public
void
Bar(B2 parm1, B2 parm2
=
null
)
34
{
35
Console.WriteLine(
"
In D.Bar
"
);
36
}
37
public
void
Foo2(IEnumerable
<
B2
>
parm)
38
{
39
Console.WriteLine(
"
In D.Foo2
"
);
40
}
41
}
42
43
class
Program
44
{
45
static
void
Main(
string
[] args)
46
{
47
var obj1
=
new
D();
48
obj1.Bar(
new
D2());
49
50
var obj2
=
new
D();
51
obj2.Foo(
new
D2());
52
obj2.Foo(
new
B2());
53
54
B obj3
=
new
D();
55
obj3.Foo(
new
D2());
56
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var obj4
=
new
D();
58
((B)obj4).Foo(
new
D2());
59
obj4.Foo(
new
B2());
60
61
var sequence
=
new
List
<
D2
>
{
new
D2(),
new
D2() };
62
var obj5
=
new
D();
63
obj2.Foo2(sequence);
64
65
Console.Read();
66
}
67
}
68
}
转载于:https://www.cnblogs.com/zhtf2014/archive/2011/02/23/1962610.html
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