markus / packages / EntityFramework.4.3.1 / tools / EF4.3on.NET4.5Readme.txt @ 0c997b99
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Entity Framework 5 Recommended for .NET Framework 4.5 Projects |
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You have installed EF 4.3 in a project that targets .NET Framework 4.5. |
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There are some known issues using EF 4.x in a .NET 4.5 project. |
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We recommend installing a pre-release version of EF 5, which is designed to work with .NET 4.5 |
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1) Open package manager console |
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Tools -> Library Package Manager -> Package Manager Console |
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2) Use the following command to install the latest pre-release package |
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Install-Package EntityFramework -IncludePreRelease |
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Known Issues with Entity Framework 4.x and .NET Framework 4.5 |
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Entity Framework 4.1 thru 4.3 included additional data annotations in the |
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System.ComponentModel.DataAnnotations namespace in the EntityFramework assembly. |
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In .NET 4.5 these annotations were moved to be part of the .NET Framework in the |
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System.ComponentModel.DataAnnotations.Schema namespace of the |
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System.ComponentModel.DataAnnotations.dll assembly. If you are using EF 4.x and targeting |
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.NET 4.5 this results in two data annotations with the same name in different assemblies. |
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Because the annotations in the .NET Framework are in a different namespace we were not |
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able to use type forwarding to avoid this conflict. |
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It is possible to use EF 4.x on .NET 4.5 but we recommend using the latest pre-release |
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version of EF 5. If you are not using the affected data annotations there is no impact |
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on your code. If you are using the data annotations in a C# project you can use the extern |
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modifier to ensure your code uses the annotations from EntityFramework.dll |
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(http://msdn.microsoft.com/en-us/library/e59b22c5(v=VS.80).aspx). If you use the new |
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annotations from the System.ComponentModel.DataAnnotations.dll assembly in .NET 4.5 |
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they will not be processed by Code First. |
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The affected annotations are: |
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- Column |
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- ComplexType |
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- DatabaseGenerated |
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- DatabaseGeneratedOption |
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- ForeignKey |
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- InverseProperty |
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- MaxLength |
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- MinLength |
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- NotMapped |
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- Table |
