Exclude columns getting data with Entity Framework [duplicate]

问题

I'm using Entity Framework in C#. And I want exclude some columns while getting data from database. For example, my student table has 10 colums. And there is some columns in table like CreatedDate, CreatedBy, CreateRole, UpdatedDate, Updatedby, UpdatedRole. I want generic solution for exclude this column while getting list from database like below.

I'm looking for like below

 context.Students   
.Exclude("CreatedDate","CreatedBy","CreateRole","UpdatedDate","Updatedby","UpdatedRole")
.ToList();

Please don't advice below solution, because this is not what I'm looking for.

context.Students.Select(p=>new {
p.Name,
p.Surname,
p.Number,
p.BirthDate
}).ToList();

回答1:

As stated in my comments, I would create a model, for the properties which are only needed occasionally:

public class CreateAndUpdatePropertiesModel
{
    public DateTime CreatedDate { get; set; }
    public string CreatedBy { get; set; }
    public DateTme ModifiedDate { get; set; }
    public string ModifiedBy { get; set; }
    // ...and so on
}

And then use this model as a property in my primary model:

public class StudentModel
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public DateTime DateOfBirth { get; set; }
    // ...rest of the properties here

    // And then add the CreateAndUpdateProperties model as a property
    public CreateAndUpdateProperties { get; set; }
}

Then when you select items from Entity Framework, you can use

.Include(s => s.CreateAndUpdateProperties)

if you want to include the create and update properties. Without this include, it would just be null.

回答2:

You can modify DBContext as follows.

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<Students>().Ignore(t=>t.CreatedDate).Ignore(t=>t.CreatedBy).Ignore(t=>t.CreateRole).Ignore(t=>t.UpdatedDate).Ignore(t=>t.Updatedby).Ignore(t=>t.UpdatedRole);

    base.OnModelCreating(modelBuilder);
}

来源：https://stackoverflow.com/questions/53553305/exclude-columns-getting-data-with-entity-framework

标签

entity-framework

linq