[英]ef core .Include().Contains() null reference exception
我有这样的模型设置...
public class Model1 : IEquatable<Model1>
{
public int Model1Id { get; set; }
public string Name1 { get; set; }
public Model2 Model2 { get; set; }
public int Model2Id { get; set; }
public bool Equals(Model1 other)
{
return this.Model2.Equals(other.Model2)
&& this.Name1 == other.Name1;
}
}
public class Model2 : IEquatable<Model2>
{
public int Model2Id { get; set; }
public string Name2 { get; set; }
public bool Equals(Model2 other)
{
return this.Name2 == other.Name2;
}
}
public class ModelContext : DbContext
{
public DbSet<Model1> Model1 { get; set; }
public DbSet<Model2> Model2 { get; set; }
public ModelContext(DbContextOptions<ModelContext> options) : base(options) { }
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Model1>(b =>
{
b.HasOne(m1 => m1.Model2).WithMany().HasForeignKey(m1 => m1.Model2Id);
});
}
}
然后当我这样做时,我得到一个空引用异常...
static void Main(string[] args)
{
var myModel1 = new Model1
{
Name1 = "myName1",
Model2 = new Model2
{
Name2 = "myName2"
}
};
var connection = new SqliteConnection("DataSource=:memory:");
connection.Open();
try
{
var options = new DbContextOptionsBuilder<ModelContext>()
.UseSqlite(connection)
.Options;
//create database
using(var ctx = new ModelContext(options))
{
ctx.Database.EnsureCreated();
}
//add model objects
using (var ctx = new ModelContext(options))
{
ctx.Database.EnsureCreated();
ctx.Model1.Add(myModel1);
ctx.SaveChanges();
}
//check if exists
using(var ctx = new ModelContext(options))
{
//exception here
bool isExists = ctx.Model1.Include(m1 => m1.Model2).Contains(myModel1);
Console.WriteLine(isExists);
}
}
finally
{
connection.Close();
}
Console.ReadKey();
}
我正在调用我的Include
时填充我的m1
的Model2
实例,但它仍然为null
。
但是,如果我将AsEnumerable()添加到查询中,例如。
ctx.Model1.Include(m1 => m1.Model2).AsEnumerable().Contains(model1);
然后一切正常。
编辑:
我的问题是...为什么我需要调用AsEnumerable()? 我期望它在不调用AsEnumerable()的情况下工作。
区别是一个是entityframe工作调用,另一个是对对象的linq Entity Framework不了解包含用于CLR对象的对象
public void AddIfNotExists(Model1 model1)
{
//No Need for the include this is executed in sql, assuming the model 2
//property has already been included in your model1 this should work fine
if(false == _context.Model1.Any(x => x.Name1 == model1.Name1
&& x.Model2.Name2 == model1.Model2.Name2))
{
_context.Model1.Add(model1);
}
}
我是根据您的逻辑进行此操作的,但是您真的很可能只想检查model1.id是否为model1集。 但是我不知道您的架构在做什么,所以这可能就是您想要的
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