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href="/">南软g开?/a> 览ơ数Q?Script Language="Javascript" Src="/item/GetHits.asp?Action=Count&GetFlag=0&m=1&ID=2900"></Script></div> <div class="article_main"><div id="MyContent"><p><span style="font-size: 14px;">  隐式cd</span></p><p><span style="font-size: 14px;">  Q?Q源?/span></p><p><span style="font-size: 14px;">  在隐式类型出C?</span></p><p><span style="font-size: 14px;">  我们在声明一个变量的时?</span></p><p><span style="font-size: 14px;">  L要ؓ一个变量指定他的类?/span></p><p><span style="font-size: 14px;">  甚至在foreach一个集合的时候,</span></p><p><span style="font-size: 14px;">  也要为遍历的集合的元素,指定变量的类?/span></p><p><span style="font-size: 14px;">  隐式cd的出玎ͼ</span></p><p><span style="font-size: 14px;">  E序员就不用再做q个工作了?/span></p><p><span style="font-size: 14px;">  Q?Q用方?/span></p><p><span style="font-size: 14px;">  来看下面的代码:</span></p><p><span style="font-size: 14px;">    var a = 1; //int a = 1;</span></p><p><span style="font-size: 14px;">    var b = "123";//string b = "123";</span></p><p><span style="font-size: 14px;">    var myObj = new MyObj();//MyObj myObj = new MyObj()</span></p><p><span style="font-size: 14px;">  var myObj = new MyObj();//MyObj myObj = new MyObj()</span></p><p><span style="font-size: 14px;">  上面的每行代码,与每行代码后面的注释Qv到的作用是完全一L</span></p><p><span style="font-size: 14px;">  也就是说Q在声明一个变量(q且同时l它赋|的时候,完全不用指定变量的类型,只要一个varp决问题了</span></p><p><span style="font-size: 14px;">  Q?Q你担心q样写会降低性能吗?</span></p><p><span style="font-size: 14px;">  我可以负责Q的告诉你Q这样写不会影响性能Q?/span></p><p><span style="font-size: 14px;">  上面的代码和注释里的代码Q编译后产生的IL代码Q中间语a代码Q是完全一L</span></p><p><span style="font-size: 14px;">  Q编译器Ҏ变量的|推导出变量的cdQ才产生的IL代码Q?/span></p><p><span style="font-size: 14px;">  Q?Q这个关键字的好处:</span></p><p><span style="font-size: 14px;">  你不用在声明一个变量ƈl这个变量赋值的时候,写两ơ变量类?/span></p><p><span style="font-size: 14px;">  Q这一点真的ؓ开发者节省了很多旉Q?/span></p><p><span style="font-size: 14px;">  在foreach一个集合的时候,可以使用var关键字来代替书写循环变量的类?/span></p><p><span style="font-size: 14px;">  Q?Q注意事?/span></p><p><span style="font-size: 14px;">  你不能用var关键字声明一个变量而不l它赋?/span></p><p><span style="font-size: 14px;">  因ؓ~译器无法推导出你这个变量是什么类型的?/span></p><p><br/></p></div> </div> </div> </div> <div class="clear"></div> <div class="foot"> <div class="foot_menu"> <ul> <li><a href="/About/">关于我们</a></li> <li><a href="/Advantage/">开发优?/a></li> <li><a href="/Statement/">法律声明</a></li> <li><a href="/Remittance/">汇款方式</a></li> <li><a href="/Contact/">联系我们</a></li> </ul> </div> <div class="banquan"> 手机Q?8678812288 EQMail:1069706080@qq.com<br /> 地址Q山东省南市舜耕\泉城公园东门园内向北50c? 鲁ICP?7011972? 版权所?008Q?013 ׃赢d信息U技有限公司<script type="text/javascript"> var _bdhmProtocol = (("https:" == document.location.protocol) ? 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