blocks|key|868915|text|是的，您可以安全地将您的MVC2应用程序迁移到MVC3。http://weblogs.asp.net/leftslipper/archive/2010/07/28/migrating-asp-net-mvc-2-applications-to-asp-net-mvc-3-preview-1.aspx|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|868916|entityMap|0|LINK|mutability|MUTABLE|url|http://weblogs.asp.net/leftslipper/archive/2010/07/28/migrating-asp-net-mvc-2-applications-to-asp-net-mvc-3-preview-1.aspx^0|S|3E|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Yes you can migrate your MVC2 app to MVC3 safely. <a href="http://weblogs.asp.net/leftslipper/archive/2010/07/28/migrating-asp-net-mvc-2-applications-to-asp-net-mvc-3-preview-1.aspx" rel="nofollow">http://weblogs.asp.net/leftslipper/archive/2010/07/28/migrating-asp-net-mvc-2-applications-to-asp-net-mvc-3-preview-1.aspx</a>

blocks|key|868952|text|是的，asp.net+mvc2是向前兼容的。我们有相当大的产品，我们没有遇到任何问题。您可以查看以下说明进行升级。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|868953|how+to+upgrade+your+exisitng+asp.net+mvc+2+project+to+asp.net+mvc+3|offset|length|868954|entityMap|0|LINK|mutability|MUTABLE|url|http://www.adeelhussain.com/how-to-upgrade-your-exisitng-asp-net-mvc-2-project-to-asp-net-mvc-3/^0|0|0|1V|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

yes asp.net mvc 2 is forward compatible. We have fairly large product and we faced no problems. you can check the following instructions to upgrade.

<a href="http://www.adeelhussain.com/how-to-upgrade-your-exisitng-asp-net-mvc-2-project-to-asp-net-mvc-3/" rel="nofollow">how to upgrade your exisitng asp.net mvc 2 project to asp.net mvc 3</a>

blocks|key|4536140|text|对我来说，从MVC2迁移到MVC3要比从版本1迁移到2容易得多。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4536141|我遇到的唯一问题是Nullable操作参数总是为null+(即使有值)……但我认为这只是RC2中的一个bug。|4536142|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Moving from MVC 2 to MVC 3 was much easier than the move from version 1 to 2 for me. 

The only issue I encountered was the Nullable action parameters always being null (even when there is a value)... but I think that was just a bug in RC2.

blocks|key|2936871|text|其他响应者是不正确的。在大多数情况下，MVC2应用程序将继续在MVC3上运行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2936872|对站点进行可能会影响用户的功能更改时，|2936873|会阻止应用程序对应用程序进行runtime|unordered-list-item|2936874|introduce失败|2936875|2936876|虽然这种情况应该很少见(并且完全取决于您是否使用了行为发生变化的特性)，但请确保阅读release+notes并测试您的应用程序，以确保它可以工作。|offset|length|2936877|entityMap|0|LINK|mutability|MUTABLE|url|http://www.asp.net/learn/whitepapers/mvc3-release-notes^0|0|0|0|0|0|16|D|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|X|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|Y|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|10|8|@]|9|@$L|11|M|12|1|13]]|A|$]]|$1|N|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]]]

The other responders are not correct. MVC 2 apps will continue to run in tha majority of cases on MVC 3. However, there's a a few breaking changes that could

<ul>
<li>prevent your application from compiling</li>
<li>cause the application to fail at runtime</li>
<li>introduce functional changes to your site that could affect users</li>
</ul>

While this should be quite rare (and depends entirely on whether you use features whose behaviors have changed), please make sure to read the <a href="http://www.asp.net/learn/whitepapers/mvc3-release-notes" rel="nofollow">release notes</a> and test your application to make sure it works.

I have been working on a ASP.NET MVC 2 project and i've been thinking if i should migrate it to ASP.NET MVC 3. 

I'm not sure though if it's forward compatible and i dont have to re work that much on my existing application.

Another issue i have is if migrating would affect the behavior of my Dev Express controls. Or any third party control for that matter.

Is a ASP.NET MVC 2 app forward compatible to ASP.NET MVC 3 framework

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我一直在做一个ASP.NET MVC2项目，我一直在想是否应该把它迁移到ASP.NET MVC3。虽然我不确定它是否向前兼容，而且我不需要在现有的应用程序上做太多的重新工作。我的另一个问题是迁移是否会影响我的Dev Express控件的行为。或任何第三方控件。

问一个与ASP.NET MVC 3框架兼容的ASP.NET MVC 2应用程序
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