标题是pretty的清晰。有什么不同的建筑/运行针对.NET 4的应用程序，如果你只安装.NET 4.0框架或.Net 4.5框架？

the title is pretty clear. Is there any difference building / running an application targeting .Net 4 if you have installed only .Net 4 Framework or .Net 4.5 Framework?

我的一位同事表示，即使该应用程序面向.NET 4安装4.5有差别，我不能确定。

A colleague of mine said that even if the application targets .Net 4 installing the 4.5 makes a difference and I'm unsure.

感谢。

推荐答案

NET 4.5是一个就地升级的.NET 4，所以即使你面向.NET 4中，您将使用.NET 4.5，请参阅http://www.hanselman.com/blog/NETVersioningAndMultiTargetingNET45IsAnInplaceUpgradeToNET40.aspx.

NET 4.5 is an "in-place upgrade" of .NET 4, so even if you target .Net 4 you will be using .NET 4.5, see http://www.hanselman.com/blog/NETVersioningAndMultiTargetingNET45IsAnInplaceUpgradeToNET40.aspx.

Summarising这个博客，也有.NET的，可以并排安装三个主要版本：

Summarising this blog, there are three major version of .NET that can be installed side by side:

在未成年人的版本是就地升级

The "minor" versions are in place upgrades