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<DIV class=3DpostText>
<P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;=20
<FONT=20
size=3D4><STRONG>C#=E8=8B=A5=E5=B9=B2=E7=9F=A5=E8=AF=86=E7=82=B9=E7=9A=84=
=E5=B0=8F=E7=A8=8B=E5=BA=8F<BR></STRONG></FONT>&nbsp;=E3=80=80=E3=80=80=E3=
=80=80=E3=80=80=E3=80=80&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
&nbsp;<FONT=20
size=3D2>=E4=BD=9C=E8=80=85=EF=BC=9A=EF=BC=88ECNU=EF=BC=89=E5=AD=9F=E5=BA=
=86=E6=B6=9B<BR></FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;=20
&nbsp;Email: <A =
href=3D"mailto:mqt-2003@163.com">mqt-2003@163.com</A></P>
<P><FONT =
size=3D2><STRONG>=E6=B3=A8=EF=BC=9A</STRONG></FONT>=E4=B8=80=E4=B8=8B=E6=98=
=AF=E4=B8=AA=E4=BA=BA=E5=9C=A8=E7=BB=83=E4=B9=A0C#=E6=97=B6=E6=89=80=E4=BD=
=BF=E7=94=A8=E7=9A=84=E4=BE=8B=E5=AD=90=EF=BC=8C=E6=9C=89=E4=B8=80=E9=83=A8=
=E5=88=86=E6=98=AF=E8=87=AA=E5=B7=B1=E5=86=99=E7=9A=84=EF=BC=8C=E4=B8=80=E9=
=83=A8=E5=88=86=E6=9D=A5=E8=87=AA=E4=BA=8E=E3=80=8AC#=20
=E9=AB=98=E7=BA=A7=E7=BC=96=E7=A8=8B=E3=80=8B=EF=BC=8C=E7=89=B9=E6=AD=A4=E5=
=A3=B0=E6=98=8E=E3=80=82=E5=A6=82=E9=9C=80=E5=BC=95=E7=94=A8=EF=BC=8C=E8=AF=
=B7=E6=A0=87=E6=98=8E=E4=BD=9C=E8=80=85<BR><FONT size=3D2><STRONG>1:=20
try_catch_fianlly=E8=AF=AD=E6=B3=95</STRONG></FONT><BR>using System;</P>
<P>namespace Wrox.ProCSharp.AdvancedCSharp<BR>{<BR>&nbsp;&nbsp;&nbsp; =
public=20
class MainEntryPoint<BR>&nbsp;&nbsp;&nbsp;=20
{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public static void=20
Main()<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
string=20
userInput;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;=20
while=20
(true)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;=20
{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;=20
try<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;=20
{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;=20
Console.Write("Input a number between 0 and 5 " + "(or just hit return =
to=20
exit)&gt;=20
");<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
userInput =3D=20
Console.ReadLine();<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
if (userInput =3D=3D=20
"")<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =

break;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
int index =3D=20
Convert.ToInt32(userInput);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =

if (index &lt; 0 || index &gt;=20
5)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
throw new IndexOutOfRangeException("You typed in " +=20
userInput);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
Console.WriteLine("Your number was " +=20
index);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;=20
catch (IndexOutOfRangeException=20
e)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;=20
{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
Console.WriteLine("Exception: " +"Number should be between 0 and 5. " +=20
e.Message);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;=20
catch (Exception=20
e)<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;=20
{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
Console.WriteLine("An exception was thrown. Message was: " +=20
e.Message);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;=20
catch<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;=20
{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
Console.WriteLine("Some other exception has=20
occurred");<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;=20
finally<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
{<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
Console.WriteLine("Thank=20
you");<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;=20
}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
}<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; }<BR>&nbsp;&nbsp;&nbsp;=20
}<BR>}<BR><FONT =
size=3D2><STRONG>2=EF=BC=9A=E4=BB=A3=E8=A1=A8=EF=BC=88delegate=EF=BC=89=20
<BR></STRONG></FONT>=E6=B3=A8=E6=84=8F=EF=BC=8C=E8=BF=99=E4=B8=A4=E7=A7=8D=
=E7=9A=84=E8=BE=93=E5=87=BA=E7=BB=93=E6=9E=9C=E6=98=AF=E4=B8=8D=E5=90=8C=E7=
=9A=84=EF=BC=8C=E5=A4=A7=E5=AE=B6=E5=8F=AF=E4=BB=A5=E7=9B=B4=E6=8E=A5=E5=8E=
=BB=E8=BF=90=E8=A1=8C=E4=B8=80=E4=B8=8B=EF=BC=8C=E7=9C=8B=E7=9C=8B=EF=BC=9A=
<BR>(1)=E5=BD=A2=E5=BC=8F1<BR>using=20
System;</P>
<P>namespace Wrox.ProCSharp.AdvancedCSharp<BR>{<BR>&nbsp;delegate double =

DoubleOp(double x);</P>
<P>&nbsp;class MainEntryPoint<BR>&nbsp;{<BR>&nbsp;&nbsp;static void=20
Main()<BR>&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;/***************************=
***************************************************<BR>&nbsp;&nbsp;&nbsp;=
=20
* &nbsp;&nbsp;&nbsp; * <BR>&nbsp;&nbsp;&nbsp; *=20
=E4=BB=A3=E8=A1=A8=E6=95=B0=E7=BB=84=EF=BC=8C=E6=B3=A8=E6=84=8F=E5=92=8C=E2=
=80=9C+=E2=80=9D=E7=9A=84=E5=BD=A2=E5=BC=8F=E5=8C=BA=E5=88=AB<BR>&nbsp;&n=
bsp;&nbsp; * Console.WriteLine("Using=20
operations[{0}]:",=20
i);<BR>&nbsp;&nbsp;&nbsp;&nbsp;ProcessAndDisplayNumber(operations[i],=20
2.0);<BR>&nbsp;&nbsp;&nbsp;&nbsp;ProcessAndDisplayNumber(operations[i],=20
7.94);<BR>&nbsp;&nbsp;&nbsp;&nbsp;ProcessAndDisplayNumber(operations[i], =

1.414);<BR>&nbsp;&nbsp;&nbsp; * <BR>&nbsp;&nbsp;&nbsp; *=20
*************************************************************************=
****/<BR>&nbsp;&nbsp;&nbsp;DoubleOp=20
[] operations =3D <BR>&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;new =

DoubleOp(MathsOperations.MultiplyByTwo),<BR>&nbsp;&nbsp;&nbsp;&nbsp;new=20
DoubleOp(MathsOperations.Square)<BR>&nbsp;&nbsp;&nbsp;};</P>
<P>&nbsp;&nbsp;&nbsp;for (int i=3D0 ; i&lt;operations.Length ;=20
i++)<BR>&nbsp;&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;&nbsp;Console.WriteLine(=
"Using=20
operations[{0}]:",=20
i);<BR>&nbsp;&nbsp;&nbsp;&nbsp;ProcessAndDisplayNumber(operations[i],=20
2.0);<BR>&nbsp;&nbsp;&nbsp;&nbsp;ProcessAndDisplayNumber(operations[i],=20
7.94);<BR>&nbsp;&nbsp;&nbsp;&nbsp;ProcessAndDisplayNumber(operations[i], =

1.414);<BR>&nbsp;&nbsp;&nbsp;&nbsp;Console.WriteLine();<BR>&nbsp;&nbsp;&n=
bsp;&nbsp;Console.ReadLine();<BR>&nbsp;&nbsp;&nbsp;}<BR>&nbsp;&nbsp;}</P>=

<P>&nbsp;&nbsp;static void ProcessAndDisplayNumber(DoubleOp action, =
double=20
value)<BR>&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;double result =3D=20
action(value);<BR>&nbsp;&nbsp;&nbsp;Console.WriteLine("Value is {0}, =
result of=20
operation is {1}", value, result);<BR>&nbsp;&nbsp;}<BR>&nbsp;}</P>
<P>&nbsp;class MathsOperations<BR>&nbsp;{<BR>&nbsp;&nbsp;public static =
double=20
MultiplyByTwo(double value)<BR>&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;return =

value*2;<BR>&nbsp;&nbsp;}</P>
<P>&nbsp;&nbsp;public static double Square(double=20
value)<BR>&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;return=20
value*value;<BR>&nbsp;&nbsp;}<BR>&nbsp;}<BR>}<BR>(2)=E5=BD=A2=E5=BC=8F2<B=
R>using System;</P>
<P>namespace Wrox.ProCSharp.AdvancedCSharp<BR>{<BR>&nbsp;delegate void=20
DoubleOp(double value);</P>
<P>&nbsp;class MainEntryPoint<BR>&nbsp;{<BR>&nbsp;&nbsp;static void=20
Main()<BR>&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;/*****=
************************************************************************<=
BR>&nbsp;&nbsp;&nbsp;=20
* <BR>&nbsp;&nbsp;&nbsp; * <BR>&nbsp;&nbsp;&nbsp; * DoubleOp operations =
=3D new=20
DoubleOp(MathsOperations.MultiplyByTwo);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;=20
operations +=3D new=20
DoubleOp(MathsOperations.Square);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
operations+=3Dnew DoubleOp(MathsOperations.www);<BR>&nbsp;&nbsp;&nbsp; * =

=E6=B3=A8=E6=84=8F=E4=BB=A3=E8=A1=A8=E2=80=9C+=E2=80=9D=E7=9A=84=E4=BD=9C=
=E7=94=A8<BR>&nbsp;&nbsp;&nbsp; * <BR>&nbsp;&nbsp;&nbsp; *=20
<BR>&nbsp;&nbsp;&nbsp; * <BR>&nbsp;&nbsp;&nbsp; *=20
*************************************************************************=
***/<BR>&nbsp;&nbsp;&nbsp;DoubleOp=20
operations =3D new=20
DoubleOp(MathsOperations.MultiplyByTwo);<BR>&nbsp;&nbsp;&nbsp;operations =
+=3D new=20
DoubleOp(MathsOperations.Square);<BR>&nbsp;&nbsp;&nbsp;operations+=3Dnew =

DoubleOp(MathsOperations.www);</P>
<P>&nbsp;&nbsp;&nbsp;ProcessAndDisplayNumber(operations,=20
2.0);<BR>&nbsp;&nbsp;&nbsp;ProcessAndDisplayNumber(operations,=20
7.94);<BR>&nbsp;&nbsp;&nbsp;ProcessAndDisplayNumber(operations,=20
1.414);<BR>&nbsp;&nbsp;&nbsp;Console.WriteLine();<BR>&nbsp;&nbsp;&nbsp;Co=
nsole.ReadLine();<BR>&nbsp;&nbsp;}</P>
<P>&nbsp;&nbsp;static void ProcessAndDisplayNumber(DoubleOp action, =
double=20
value)<BR>&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;Console.WriteLine("\nProcess=
AndDisplayNumber=20
called with value =3D " +=20
value);<BR>&nbsp;&nbsp;&nbsp;action(value);<BR>&nbsp;&nbsp;&nbsp;<BR>&nbs=
p;&nbsp;}<BR>&nbsp;}</P>
<P>&nbsp;class MathsOperations<BR>&nbsp;{<BR>&nbsp;&nbsp;public static =
void=20
MultiplyByTwo(double value)<BR>&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;double =
result=20
=3D value*2;<BR>&nbsp;&nbsp;&nbsp;Console.WriteLine("Multiplying by 2: =
{0} gives=20
{1}", value, result);<BR>&nbsp;&nbsp;}</P>
<P>&nbsp;&nbsp;public static void Square(double=20
value)<BR>&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;double result =3D=20
value*value;<BR>&nbsp;&nbsp;&nbsp;Console.WriteLine("Squaring: {0} gives =
{1}",=20
value, result);<BR>&nbsp;&nbsp;}<BR>&nbsp;&nbsp;public static void =
www(double=20
value)<BR>&nbsp;&nbsp;{<BR>&nbsp;&nbsp;&nbsp;Console.WriteLine("ddddddddd=
dddd");<BR>&nbsp;&nbsp;}<BR>&nb
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#net #framework #frame #工作原理
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