摘要:
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摘要:
问题:entitytype has no key definedSolution:增加引用增加关键字[Key] using System.ComponentModel.DataAnnotations;[global::System.Data.Linq.Mapping.ColumnAttribute... 阅读全文
摘要:
问题:The type or namespace name 'DbContext' could not be found (are you missing a using directive or an assembly reference?)解决方案:引用EntityFramework.dll 即... 阅读全文