改变目标框架

Question

在Visual Studio 2010速成[VB.NET]，如果我通过应用程序属性更改目标框架> 4.0编译>高级编译选项框架2.0，我得到的错误列表：

Warning 5 The referenced component 'System.Xml.Linq' could not be found. 
Warning 6 The referenced component 'System.Data.DataSetExtensions' could not be found.  
Warning 4 The referenced component 'System.Core' could not be found. 
Warning 2 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". WindowsApplication3 
Warning 3 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". WindowsApplication3 
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". WindowsApplication3 
Warning 7 Namespace or type specified in the project-level Imports 'System.Xml.Linq' doesn't contain any public member or cannot be found. Make sure the namespace or the type is defined and contains at least one public member. Make sure the imported element name doesn't use any aliases. WindowsApplication3 
Warning 8 Namespace or type specified in the project-level Imports 'System.Linq' doesn't contain any public member or cannot be found. Make sure the namespace or the type is defined and contains at least one public member. Make sure the imported element name doesn't use any aliases. WindowsApplication3 

我已经搜索过，但我似乎无法找到我认为对我有用的答案。我只是使用一个没有任何内容的空白项目。

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Warning 1 Namespace or type specified in the project-level Imports 'System.Xml.Linq' doesn't contain any public member or cannot be found. Make sure the namespace or the type is defined and contains at least one public member. Make sure the imported element name doesn't use any aliases. WindowsApplication3 
Warning 2 Namespace or type specified in the project-level Imports 'System.Linq' doesn't contain any public member or cannot be found. Make sure the namespace or the type is defined and contains at least one public member. Make sure the imported element name doesn't use any aliases. WindowsApplication3 

Answer 1

尝试在您的项目（S）移除的引用：

System.Xml.Linq 
System.Data.DataSetExtensions 
System.Core 

它们是由VS2010自动添加表达。

您可以通过展开引用树，突出显示引用并按下删除来实现此目的。