Mixing
Mapping a complex object using C# & Linq-to-entities
I have two Domain classes:
var ParentClass
{
public Guid Id { get; set; }
public virtual IEnumerable<ChildClass> Children { get; set; }
}
var ChildClass
{
public Guid Id { get; set; }
public Guid ParentId { get; set; }
public virtual ParentClass Parent{ get; set; }
}
how can I get a list of ParentClass an map it and all of it's children to two predefined view models('PClass' to map ParentClass & 'ChClass' to map ChildClass)?
I tried this code but it seems not working:
var query = MyDataContext.ParentClasses.Select(x => new PClass
{
Id = x.Id,
Children = x.Children.Select(y => new ChClass // this select is not working
{
Id = y.Id,
ParentId = y.ParentId,
Parent = x // x is not the right type and it should be of type 'PClass'
})
}).ToList();
c# entity-framework linq-to-entities
asked Nov 21 '18 at 15:14
amir molaamir mola
77110
add a comment |
I have two Domain classes:
var ParentClass
{
public Guid Id { get; set; }
public virtual IEnumerable<ChildClass> Children { get; set; }
}
var ChildClass
{
public Guid Id { get; set; }
public Guid ParentId { get; set; }
public virtual ParentClass Parent{ get; set; }
}
how can I get a list of ParentClass an map it and all of it's children to two predefined view models('PClass' to map ParentClass & 'ChClass' to map ChildClass)?
I tried this code but it seems not working:
var query = MyDataContext.ParentClasses.Select(x => new PClass
{
Id = x.Id,
Children = x.Children.Select(y => new ChClass // this select is not working
{
Id = y.Id,
ParentId = y.ParentId,
Parent = x // x is not the right type and it should be of type 'PClass'
})
}).ToList();
c# entity-framework linq-to-entities
asked Nov 21 '18 at 15:14
amir molaamir mola
77110
add a comment |
I have two Domain classes:
var ParentClass
{
public Guid Id { get; set; }
public virtual IEnumerable<ChildClass> Children { get; set; }
}
var ChildClass
{
public Guid Id { get; set; }
public Guid ParentId { get; set; }
public virtual ParentClass Parent{ get; set; }
}
how can I get a list of ParentClass an map it and all of it's children to two predefined view models('PClass' to map ParentClass & 'ChClass' to map ChildClass)?
I tried this code but it seems not working:
var query = MyDataContext.ParentClasses.Select(x => new PClass
{
Id = x.Id,
Children = x.Children.Select(y => new ChClass // this select is not working
{
Id = y.Id,
ParentId = y.ParentId,
Parent = x // x is not the right type and it should be of type 'PClass'
})
}).ToList();
c# entity-framework linq-to-entities
asked Nov 21 '18 at 15:14
amir molaamir mola
77110
I have two Domain classes:
var ParentClass
{
public Guid Id { get; set; }
public virtual IEnumerable<ChildClass> Children { get; set; }
}
var ChildClass
{
public Guid Id { get; set; }
public Guid ParentId { get; set; }
public virtual ParentClass Parent{ get; set; }
}
how can I get a list of ParentClass an map it and all of it's children to two predefined view models('PClass' to map ParentClass & 'ChClass' to map ChildClass)?
I tried this code but it seems not working:
var query = MyDataContext.ParentClasses.Select(x => new PClass
{
Id = x.Id,
Children = x.Children.Select(y => new ChClass // this select is not working
{
Id = y.Id,
ParentId = y.ParentId,
Parent = x // x is not the right type and it should be of type 'PClass'
})
}).ToList();
c# entity-framework linq-to-entities
c# entity-framework linq-to-entities
asked Nov 21 '18 at 15:14
amir molaamir mola
77110
asked Nov 21 '18 at 15:14
amir molaamir mola
77110
edited Nov 21 '18 at 15:48
amir mola
asked Nov 21 '18 at 15:14
amir molaamir mola
77110
asked Nov 21 '18 at 15:14
amir molaamir mola
77110
asked Nov 21 '18 at 15:14
amir molaamir mola
77110
77110
add a comment |
add a comment |
1 Answer
1
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oldest
votes
If every PClass has zero or more Children, it is fairly useless to fill in the parent of every Child class, because you already know that it is PClass.
Besides, this Parent in the ChildClass has at least one Child with a PClass in it which of course has at least one child with a Parent who has at least one Child with has a Parent, ... when do you want to stop?
So in such cases, we either tend not to provide a property to the Parent, or give it a null value:
var query = MyDataContext.Parents.Select(parent => new PClass
{
Id = parent.Id,
Children = parent.Children.Select(child => new ChClass
{
Id = child.Id,
// ParentId = y.ParentId, Useless, you know it has the same value as Id
// Parent = ... useless, you know it has the same value as the parent
// that you are creating.
})
.ToList(),
});
answered Nov 21 '18 at 15:30
Harald CoppoolseHarald Coppoolse
12.3k12960
Thanks for your answer but the main problem is that the second Select won't work at all.
– amir mola
Nov 21 '18 at 15:41
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
If every PClass has zero or more Children, it is fairly useless to fill in the parent of every Child class, because you already know that it is PClass.
Besides, this Parent in the ChildClass has at least one Child with a PClass in it which of course has at least one child with a Parent who has at least one Child with has a Parent, ... when do you want to stop?
So in such cases, we either tend not to provide a property to the Parent, or give it a null value:
var query = MyDataContext.Parents.Select(parent => new PClass
{
Id = parent.Id,
Children = parent.Children.Select(child => new ChClass
{
Id = child.Id,
// ParentId = y.ParentId, Useless, you know it has the same value as Id
// Parent = ... useless, you know it has the same value as the parent
// that you are creating.
})
.ToList(),
});
answered Nov 21 '18 at 15:30
Harald CoppoolseHarald Coppoolse
12.3k12960
Thanks for your answer but the main problem is that the second Select won't work at all.
– amir mola
Nov 21 '18 at 15:41
add a comment |
If every PClass has zero or more Children, it is fairly useless to fill in the parent of every Child class, because you already know that it is PClass.
Besides, this Parent in the ChildClass has at least one Child with a PClass in it which of course has at least one child with a Parent who has at least one Child with has a Parent, ... when do you want to stop?
So in such cases, we either tend not to provide a property to the Parent, or give it a null value:
var query = MyDataContext.Parents.Select(parent => new PClass
{
Id = parent.Id,
Children = parent.Children.Select(child => new ChClass
{
Id = child.Id,
// ParentId = y.ParentId, Useless, you know it has the same value as Id
// Parent = ... useless, you know it has the same value as the parent
// that you are creating.
})
.ToList(),
});
answered Nov 21 '18 at 15:30
Harald CoppoolseHarald Coppoolse
12.3k12960
Thanks for your answer but the main problem is that the second Select won't work at all.
– amir mola
Nov 21 '18 at 15:41
add a comment |
If every PClass has zero or more Children, it is fairly useless to fill in the parent of every Child class, because you already know that it is PClass.
Besides, this Parent in the ChildClass has at least one Child with a PClass in it which of course has at least one child with a Parent who has at least one Child with has a Parent, ... when do you want to stop?
So in such cases, we either tend not to provide a property to the Parent, or give it a null value:
var query = MyDataContext.Parents.Select(parent => new PClass
{
Id = parent.Id,
Children = parent.Children.Select(child => new ChClass
{
Id = child.Id,
// ParentId = y.ParentId, Useless, you know it has the same value as Id
// Parent = ... useless, you know it has the same value as the parent
// that you are creating.
})
.ToList(),
});
answered Nov 21 '18 at 15:30
Harald CoppoolseHarald Coppoolse
12.3k12960
If every PClass has zero or more Children, it is fairly useless to fill in the parent of every Child class, because you already know that it is PClass.
Besides, this Parent in the ChildClass has at least one Child with a PClass in it which of course has at least one child with a Parent who has at least one Child with has a Parent, ... when do you want to stop?
So in such cases, we either tend not to provide a property to the Parent, or give it a null value:
var query = MyDataContext.Parents.Select(parent => new PClass
{
Id = parent.Id,
Children = parent.Children.Select(child => new ChClass
{
Id = child.Id,
// ParentId = y.ParentId, Useless, you know it has the same value as Id
// Parent = ... useless, you know it has the same value as the parent
// that you are creating.
})
.ToList(),
});
answered Nov 21 '18 at 15:30
Harald CoppoolseHarald Coppoolse
12.3k12960
answered Nov 21 '18 at 15:30
Harald CoppoolseHarald Coppoolse
12.3k12960
answered Nov 21 '18 at 15:30
Harald CoppoolseHarald Coppoolse
12.3k12960
answered Nov 21 '18 at 15:30
Harald CoppoolseHarald Coppoolse
12.3k12960
12.3k12960
Thanks for your answer but the main problem is that the second Select won't work at all.
– amir mola
Nov 21 '18 at 15:41
add a comment |
Thanks for your answer but the main problem is that the second Select won't work at all.
– amir mola
Nov 21 '18 at 15:41
Thanks for your answer but the main problem is that the second Select won't work at all.
– amir mola
Nov 21 '18 at 15:41
Thanks for your answer but the main problem is that the second Select won't work at all.
– amir mola
Nov 21 '18 at 15:41
add a comment |
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