c#:覆盖SaveChanges并设置ModifiedDate，但是如何设置ModifiedBy？

您可以使用 HttpContext.Current.User.Identity.Name 获取当前用户的名称。

public override int SaveChanges()
{
    var changeSet = ChangeTracker.Entries<IAuditable>();
    if (changeSet != null)
    {
        foreach (var entry in changeSet.Where(c => c.State != EntityState.Unchanged))
        {
            entry.Entity.ModifiedDate = DateProvider.GetCurrentDate();
            entry.Entity.ModifiedBy = HttpContext.Current.User.Identity.Name;
        }
    }
    return base.SaveChanges();
}

更好的方法是使用构造函数注入将当前用户传递给上下文

public class MyContext : DbContext
{
    public MyContext(string userName)
    {
        UserName = userName;
    }
    public string UserName
    {
        get; private set;
    }
    public override int SaveChanges()
    {
       var changeSet = ChangeTracker.Entries<IAuditable>();
       if (changeSet != null)
       {
          foreach (var entry in changeSet.Where(c => c.State != EntityState.Unchanged))
          {
              entry.Entity.ModifiedDate = DateProvider.GetCurrentDate();
              entry.Entity.ModifiedBy = UserName;
          }
       }
       return base.SaveChanges();
   }
}

我还想自动化我的MVC 4 / Entity Framework 5应用程序上的审核字段.我使用来自@Eranga的答案和此博客的信息：http://lourenco.co.za/blog/2013/07/audit-trails-concurrency-and-soft-deletion-with-entity-framework/使该方法有效 Ninject对我来说-在对其他人有value的情况下发布：

创建了一个接口和抽象类：

public interface IAuditableEntity {
    DateTime? CreatedDate { get; set; }
    string CreatedBy { get; set; }
    DateTime? LastModifiedDate { get; set; }
    string LastModifiedBy { get; set; }
}
public abstract class AuditableEntity:IAuditableEntity {
    public DateTime? CreatedDate { get; set; }
    public string CreatedBy { get; set; }
    public DateTime? LastModifiedDate { get; set; }
    public string LastModifiedBy { get; set; }
}

在我的实体中使用了它们：

public class DataEntity : AuditableEntity {
    public int DataEntityID { get; set; }
    ...
}

向MyDbContext添加了一个构造函数，该构造函数接受HttpContext并覆盖SaveChanges：

public EFDbContext(HttpContext context) {
    _context = context;
}
public HttpContext _context {
    get;
    private set;
}
public override int SaveChanges() {
    DateTime currentDateTime = DateTime.Now;
    foreach (var auditableEntity in ChangeTracker.Entries<IAuditableEntity>()) {
        if (auditableEntity.State == EntityState.Added || auditableEntity.State == EntityState.Modified) {
            auditableEntity.Entity.LastModifiedDate = currentDateTime;
            switch (auditableEntity.State) {
                    case EntityState.Added:
                        auditableEntity.Entity.CreatedDate = currentDateTime;
                        auditableEntity.Entity.CreatedBy = _context.User.Identity.Name;
                        break;
                    case EntityState.Modified:
                        auditableEntity.Entity.LastModifiedDate = currentDateTime;
                        auditableEntity.Entity.LastModifiedBy = _context.User.Identity.Name;
                        if (auditableEntity.Property(p => p.CreatedDate).IsModified || auditableEntity.Property(p => p.CreatedBy).IsModified) {
                            throw new DbEntityValidationException(string.Format("Attempt to change created audit trails on a modified {0}", auditableEntity.Entity.GetType().FullName));
                        }
                        break;
                }
            }
        }
        return base.SaveChanges();
    }

最后-每个请求都需要一个DbContext并根据此答案通过HttpContext传递如下：https://stackoverflow.com/a/3617961/1803682-注意，作为 MyDbContext 现在是请求范围，存储库也必须是

kernel.Bind<IDataRepository>()
      .To<EFDataRepository>()
      .InRequestScope();
kernel.Bind<MyDbContext>().ToSelf()
      .InRequestScope()
      .WithConstructorArgument("context", ninjectContext=>HttpContext.Current);