使用.net 4.0编写的程序，但我需要此应用程序在运行.net 2.0的计算机上运行

Question

这个问题应该从其标题中清楚地说明，但让我更详细地解释一下。我刚刚完成了我的应用程序的编写，我认为是.Net 4.0框架（见下图）。在意识到我需要我的应用程序与最早版本的.Net框架兼容之后，我回过头来改变了Visual Studio的Properties窗口中的Target Framework。不幸的是，这样做给我留下了一长串警告 - 以及一个严重的错误。我很好奇是否有人有一些解决方案可以让我的应用程序（使用.Net 4.0框架编写）在运行.Net 2.0框架的环境中运行。

原始编辑

错误列表：

谢谢， 埃文

编辑：

据我所知，第二张照片对我们大多数人来说并不完全可见，所以我会在下面发布错误：

Warning 9   The referenced component 'System.Xml.Linq' could not be found.  
Warning 10  The referenced component 'System.Data.DataSetExtensions' could not be found.    
Warning 8   The referenced component 'System.Core' could not be found.  
Warning 11  The referenced component 'Microsoft.CSharp' could not be found.     
Warning 4   The primary reference "System.Xml.Linq", which is a framework assembly, could not be resolved in the currently targeted framework. ".NETFramework,Version=v2.0". To resolve this problem, either remove the reference "System.Xml.Linq" or retarget your application to a framework version which contains "System.Xml.Linq".   Protection
Warning 2   The primary reference "System.Xml.Linq" could not be resolved because it has an indirect dependency on the framework assembly "System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which could not be resolved in the currently targeted framework. ".NETFramework,Version=v2.0". To resolve this problem, either remove the reference "System.Xml.Linq" or retarget your application to a framework version which contains "System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089".   Protection
Warning 5   The primary reference "System.Data.DataSetExtensions", which is a framework assembly, could not be resolved in the currently targeted framework. ".NETFramework,Version=v2.0". To resolve this problem, either remove the reference "System.Data.DataSetExtensions" or retarget your application to a framework version which contains "System.Data.DataSetExtensions". Protection
Warning 3   The primary reference "System.Data.DataSetExtensions" could not be resolved because it has an indirect dependency on the framework assembly "System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which could not be resolved in the currently targeted framework. ".NETFramework,Version=v2.0". To resolve this problem, either remove the reference "System.Data.DataSetExtensions" or retarget your application to a framework version which contains "System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089".   Protection
Warning 1   The primary reference "System.Core", which is a framework assembly, could not be resolved in the currently targeted framework. ".NETFramework,Version=v2.0". To resolve this problem, either remove the reference "System.Core" or retarget your application to a framework version which contains "System.Core".   Protection
Warning 6   The primary reference "Microsoft.CSharp", which is a framework assembly, could not be resolved in the currently targeted framework. ".NETFramework,Version=v2.0". To resolve this problem, either remove the reference "Microsoft.CSharp" or retarget your application to a framework version which contains "Microsoft.CSharp".    Protection
Error   7   Could not load file or assembly 'System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified. Line 123, position 5.    C:\Users\FARINA_EVAN\Documents\Programming\C#\Run Time Crypter\Run Time Crypter\Properties\Resources.resx   123 5   Protection

Answer 1

当您创建面向.NET 4.0的新项目时，Visual Studio会自动添加对一些常用的.NET 4.0程序集的引用。但是，在查找目标平台时，这些引用不会被删除，因此需要手动删除，因为您无法从.NET 2.0应用程序引用.NET 4.0程序集。

首先删除这些错误的引用，然后查看是否还有错误。如果您使用了.NET 2.0中不可用的任何.NET功能，则可能需要更改某些源代码，或者如果缺少.NET 2.0程序集，则可能需要添加新的引用。

出现的任何编译器错误都可能指向正确的方向。

Answer 2

是的，但您需要删除任何引用大于2的.net版本的代码。要清除上述错误，您需要删除对所有项目的引用，其中包含“引用的组件xx可能找不到“。此外，您还需要搜索资源，配置等文件，以替换任何.net 4引用.net 2 - ＆gt;从4.0.0.0到2.0.0.0，或者如果它们在.net 2中不存在，则完全删除引用。

Answer 3

错误消息告诉您错误，在这种情况下，您的项目中的引用无法解析。展开项目树中的references节点，并删除带有警告图标的引用。

如果您在此之后尝试编译，则可能会收到有关您使用的.NET 2.0中不可用的类，命名空间或关键字的其他错误。您必须删除它们或更改您的代码。

Answer 4

由于Linq在.NET 2.0中不可用，您可以尝试LinqBridge作为替代。