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在我的C#项目,我得到一个错误时,EF尝试创建我的数据库 当我打电话实体框架中使用ModelConfiguration提供了一个错误“是不是有效的属性表达”
Database.SetInitializer(new CreateDatabaseIfNotExists<ApplicationDatabase>());
的出现的错误错误消息是
The expression 'x => x.Dependancies' is not a valid property expression. The expression should represent a property: C#: 't => t.MyProperty' VB.Net: 'Function(t) t.MyProperty'.
我的域类如下
[Table("LoggedEntity")]
public class LoggedEntity
{
public int Id { get; set; }
}
[Table("TemplateTaskDependancy")]
public class TemplateTaskDependancy : LoggedEntity
{
[Column]
public int NeededTaskId { get; set; }
[Column]
public int TaskId { get; set; }
[Required]
[ForeignKey("TaskId")]
public virtual TemplateTask Task { get; set; }
[Required]
[ForeignKey("NeededTaskId")]
public virtual TemplateTask NeededTask { get; set; }
}
[Table("TemplateTask")]
public class TemplateTask : LoggedEntity
{
public ICollection<TemplateTaskDependancy> Dependancies;
public ICollection<TemplateTaskDependancy> NeededTasks;
public virtual Template Template { get; set; }
}
[Table("Template")]
public class Template : LoggedEntity
{
public string Description { get; set; }
}
我的配置类是如下
public class TemplateTaskConfiguration : EntityTypeConfiguration<TemplateTask>
{
public TemplateTaskConfiguration()
{
HasMany(x => x.Dependancies)
.WithRequired(d => d.Task)
.HasForeignKey(d => d.TaskId)
.WillCascadeOnDelete(false);
HasMany(x => x.NeededTasks)
.WithRequired(d => d.NeededTask)
.HasForeignKey(d => d.NeededTaskId)
.WillCascadeOnDelete(false);
}
}
我的上下文是如下
public class ApplicationDatabase : DbContext
{
public DbSet<TemplateTask> TemplateTasks { get; set; }
public DbSet<TemplateTaskDependancy> TemplateTaskDependancies { get; set; }
public DbSet<Template> Templates { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Conventions.Remove<OneToManyCascadeDeleteConvention>();
modelBuilder.Configurations.Add(new TemplateTaskConfiguration());
}
public void InitializeDatabase()
{
Database.SetInitializer(new CreateDatabaseIfNotExists<ApplicationDatabase>());
}
}
你确定它不应该是依赖关系?而不是依赖? – 2014-09-25 23:39:33
是的 - 拼写检查通过,但我只使用依赖 – 2014-09-25 23:42:49