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<P>=E4=BB=8E=E5=85=B7=E4=BD=93=E4=B8=BB=E9=A2=98=E8=A7=92=E8=89=B2=E6=8C=87=
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=82</P>
<H2><BR>=E4=B8=89=E3=80=81&nbsp;=E8=A7=82=E5=AF=9F=E8=80=85=E6=A8=A1=E5=BC=
=8F=E7=9A=84=E7=A4=BA=E6=84=8F=E6=80=A7=E6=BA=90=E4=BB=A3=E7=A0=81</H2>
<DIV=20
style=3D"BORDER-RIGHT: windowtext 0.5pt solid; PADDING-RIGHT: 5.4pt; =
BORDER-TOP: windowtext 0.5pt solid; PADDING-LEFT: 5.4pt; BACKGROUND: =
#e6e6e6; PADDING-BOTTOM: 4px; BORDER-LEFT: windowtext 0.5pt solid; =
WIDTH: 98%; WORD-BREAK: break-all; PADDING-TOP: 4px; BORDER-BOTTOM: =
windowtext 0.5pt solid">
<DIV><IMG =
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/None.gif"=20
align=3Dtop><SPAN style=3D"COLOR: #008000">//</SPAN><SPAN=20
style=3D"COLOR: =
#008000">&nbsp;Observer&nbsp;pattern&nbsp;--&nbsp;Structural&nbsp;example=
&nbsp;&nbsp;</SPAN><SPAN=20
style=3D"COLOR: #008000"><BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/None.gif"=20
align=3Dtop></SPAN><SPAN style=3D"COLOR: #0000ff">using</SPAN><SPAN=20
style=3D"COLOR: #000000">&nbsp;System;<BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/None.gif"=20
align=3Dtop></SPAN><SPAN style=3D"COLOR: #0000ff">using</SPAN><SPAN=20
style=3D"COLOR: #000000">&nbsp;System.Collections;<BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/None.gif"=20
align=3Dtop><BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/None.gif"=20
align=3Dtop></SPAN><SPAN style=3D"COLOR: #008000">//</SPAN><SPAN=20
style=3D"COLOR: #008000">&nbsp;"Subject"</SPAN><SPAN=20
style=3D"COLOR: #008000"><BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/None.gif"=20
align=3Dtop></SPAN><SPAN style=3D"COLOR: #0000ff">abstract</SPAN><SPAN=20
style=3D"COLOR: #000000">&nbsp;</SPAN><SPAN=20
style=3D"COLOR: #0000ff">class</SPAN><SPAN=20
style=3D"COLOR: #000000">&nbsp;Subject<BR><IMG=20
id=3DCodehighlighter1_121_453_Open_Image=20
onclick=3D"this.style.display=3D'none'; =
Codehighlighter1_121_453_Open_Text.style.display=3D'none'; =
Codehighlighter1_121_453_Closed_Image.style.display=3D'inline'; =
Codehighlighter1_121_453_Closed_Text.style.display=3D'inline';"=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockSta=
rt.gif"=20
align=3Dtop><IMG id=3DCodehighlighter1_121_453_Closed_Image =
style=3D"DISPLAY: none"=20
onclick=3D"this.style.display=3D'none'; =
Codehighlighter1_121_453_Closed_Text.style.display=3D'none'; =
Codehighlighter1_121_453_Open_Image.style.display=3D'inline'; =
Codehighlighter1_121_453_Open_Text.style.display=3D'inline';"=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.=
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align=3Dtop></SPAN><SPAN id=3DCodehighlighter1_121_453_Closed_Text=20
style=3D"BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; =
DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 =
1px solid; BACKGROUND-COLOR: #ffffff"><IMG=20
src=3D"http://www.cnblogs.com/Images/dot.gif"></SPAN><SPAN=20
id=3DCodehighlighter1_121_453_Open_Text><SPAN style=3D"COLOR: =
#000000">{<BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif"=20
align=3Dtop>&nbsp;&nbsp;</SPAN><SPAN style=3D"COLOR: =
#008000">//</SPAN><SPAN=20
style=3D"COLOR: #008000">&nbsp;Fields</SPAN><SPAN style=3D"COLOR: =
#008000"><BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif"=20
align=3Dtop></SPAN><SPAN style=3D"COLOR: =
#000000">&nbsp;&nbsp;</SPAN><SPAN=20
style=3D"COLOR: #0000ff">private</SPAN><SPAN=20
style=3D"COLOR: =
#000000">&nbsp;ArrayList&nbsp;observers&nbsp;</SPAN><SPAN=20
style=3D"COLOR: #000000">=3D</SPAN><SPAN style=3D"COLOR: =
#000000">&nbsp;</SPAN><SPAN=20
style=3D"COLOR: #0000ff">new</SPAN><SPAN=20
style=3D"COLOR: #000000">&nbsp;ArrayList();<BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif"=20
align=3Dtop><BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif"=20
align=3Dtop>&nbsp;&nbsp;</SPAN><SPAN style=3D"COLOR: =
#008000">//</SPAN><SPAN=20
style=3D"COLOR: #008000">&nbsp;Methods</SPAN><SPAN style=3D"COLOR: =
#008000"><BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif"=20
align=3Dtop></SPAN><SPAN style=3D"COLOR: =
#000000">&nbsp;&nbsp;</SPAN><SPAN=20
style=3D"COLOR: #0000ff">public</SPAN><SPAN=20
style=3D"COLOR: #000000">&nbsp;</SPAN><SPAN=20
style=3D"COLOR: #0000ff">void</SPAN><SPAN=20
style=3D"COLOR: =
#000000">&nbsp;Attach(&nbsp;Observer&nbsp;observer&nbsp;)<BR><IMG=20
id=3DCodehighlighter1_242_277_Open_Image=20
onclick=3D"this.style.display=3D'none'; =
Codehighlighter1_242_277_Open_Text.style.display=3D'none'; =
Codehighlighter1_242_277_Closed_Image.style.display=3D'inline'; =
Codehighlighter1_242_277_Closed_Text.style.display=3D'inline';"=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlock=
Start.gif"=20
align=3Dtop><IMG id=3DCodehighlighter1_242_277_Closed_Image =
style=3D"DISPLAY: none"=20
onclick=3D"this.style.display=3D'none'; =
Codehighlighter1_242_277_Closed_Text.style.display=3D'none'; =
Codehighlighter1_242_277_Open_Image.style.display=3D'inline'; =
Codehighlighter1_242_277_Open_Text.style.display=3D'inline';"=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlo=
ck.gif"=20
align=3Dtop>&nbsp;&nbsp;</SPAN><SPAN =
id=3DCodehighlighter1_242_277_Closed_Text=20
style=3D"BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; =
DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 =
1px solid; BACKGROUND-COLOR: #ffffff"><IMG=20
src=3D"http://www.cnblogs.com/Images/dot.gif"></SPAN><SPAN=20
id=3DCodehighlighter1_242_277_Open_Text><SPAN style=3D"COLOR: =
#000000">{<BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif"=20
align=3Dtop>&nbsp;&nbsp;&nbsp;&nbsp;observers.Add(&nbsp;observer&nbsp;);<=
BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlock=
End.gif"=20
align=3Dtop>&nbsp;&nbsp;}</SPAN></SPAN><SPAN style=3D"COLOR: =
#000000"><BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif"=20
align=3Dtop><BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif"=20
align=3Dtop>&nbsp;&nbsp;</SPAN><SPAN style=3D"COLOR: =
#0000ff">public</SPAN><SPAN=20
style=3D"COLOR: #000000">&nbsp;</SPAN><SPAN=20
style=3D"COLOR: #0000ff">void</SPAN><SPAN=20
style=3D"COLOR: =
#000000">&nbsp;Detach(&nbsp;Observer&nbsp;observer&nbsp;)<BR><IMG=20
id=3DCodehighlighter1_324_362_Open_Image=20
onclick=3D"this.style.display=3D'none'; =
Codehighlighter1_324_362_Open_Text.style.display=3D'none'; =
Codehighlighter1_324_362_Closed_Image.style.display=3D'inline'; =
Codehighlighter1_324_362_Closed_Text.style.display=3D'inline';"=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlock=
Start.gif"=20
align=3Dtop><IMG id=3DCodehighlighter1_324_362_Closed_Image =
style=3D"DISPLAY: none"=20
onclick=3D"this.style.display=3D'none'; =
Codehighlighter1_324_362_Closed_Text.style.display=3D'none'; =
Codehighlighter1_324_362_Open_Image.style.display=3D'inline'; =
Codehighlighter1_324_362_Open_Text.style.display=3D'inline';"=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlo=
ck.gif"=20
align=3Dtop>&nbsp;&nbsp;</SPAN><SPAN =
id=3DCodehighlighter1_324_362_Closed_Text=20
style=3D"BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; =
DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 =
1px solid; BACKGROUND-COLOR: #ffffff"><IMG=20
src=3D"http://www.cnblogs.com/Images/dot.gif"></SPAN><SPAN=20
id=3DCodehighlighter1_324_362_Open_Text><SPAN style=3D"COLOR: =
#000000">{<BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif"=20
align=3Dtop>&nbsp;&nbsp;&nbsp;&nbsp;observers.Remove(&nbsp;observer&nbsp;=
);<BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlock=
End.gif"=20
align=3Dtop>&nbsp;&nbsp;}</SPAN></SPAN><SPAN style=3D"COLOR: =
#000000"><BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif"=20
align=3Dtop><BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif"=20
align=3Dtop>&nbsp;&nbsp;</SPAN><SPAN style=3D"COLOR: =
#0000ff">public</SPAN><SPAN=20
style=3D"COLOR: #000000">&nbsp;</SPAN><SPAN=20
style=3D"COLOR: #0000ff">void</SPAN><SPAN=20
style=3D"COLOR: #000000">&nbsp;Notify()<BR><IMG=20
id=3DCodehighlighter1_390_451_Open_Image=20
onclick=3D"this.style.display=3D'none'; =
Codehighlighter1_390_451_Open_Text.style.display=3D'none'; =
Codehighlighter1_390_451_Closed_Image.style.display=3D'inline'; =
Codehighlighter1_390_451_Closed_Text.style.display=3D'inline';"=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlock=
Start.gif"=20
align=3Dtop><IMG id=3DCodehighlighter1_390_451_Closed_Image =
style=3D"DISPLAY: none"=20
onclick=3D"this.style.display=3D'none'; =
Codehighlighter1_390_451_Closed_Text.style.display=3D'none'; =
Codehighlighter1_390_451_Open_Image.style.display=3D'inline'; =
Codehighlighter1_390_451_Open_Text.style.display=3D'inline';"=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/ContractedSubBlo=
ck.gif"=20
align=3Dtop>&nbsp;&nbsp;</SPAN><SPAN =
id=3DCodehighlighter1_390_451_Closed_Text=20
style=3D"BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; =
DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 =
1px solid; BACKGROUND-COLOR: #ffffff"><IMG=20
src=3D"http://www.cnblogs.com/Images/dot.gif"></SPAN><SPAN=20
id=3DCodehighlighter1_390_451_Open_Text><SPAN style=3D"COLOR: =
#000000">{<BR><IMG=20
src=3D"http://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif"=20
align=3Dtop>&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN=20
style=3D"COLOR: #0000ff">foreach</SPAN><SPAN=20
style=3D"COLOR: #000000">(&nbsp;Observer&nbsp;o&nbsp;</SPAN><SPAN=20
style=3D"COLOR: #0000ff">in</SPAN><SPAN=20
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