Entity Framework (v6) Eager-Loading weird behaviour - 'Gotcha'
0
Should the following two queries be equivalent?
(note the placement of .Include)
== (V1)
using (var ctx = new Entities())
ctx.Configuration.ProxyCreationEnabled = false; //return stronglyTyped Entity, not dynamic entity...
IQueryable<TB_MyHeader> query = from hd in ctx.TB_MyHeader.Include(h => h.TB_MyLines)
join wo in ctx.TB_AnotherTable on hd.fkId equals wo.ID
where wo.woPk == @id
orderby hd.PoItem
select hd;
var headerPlusLines = query
.AsNoTracking()
.ToList();
return headerPlusLines;
== (V2)
using (var ctx = new Entities())
ctx.Configuration.ProxyCreationEnabled = false; //return stronglyTyped Entity, not dynamic entity...
IQueryable<TB_MyHeader> query = (from hd in ctx.TB_MyHeader
join wo in ctx.TB_AnotherTable on hd.fkId equals wo.ID
where wo.woPk == @id
orderby hd.PoItem
select hd)
.Include(h => h.TB_MyLines);
var headerPlusLines = query
.AsNoTracking()
.ToList();
return headerPlusLines;
The first version (V1) may not fetch children into the Nav property, depending on combinations of how ProxyCreationEnabled, LazyLoadingEnabled are set true/false.
In fact, the opposite of expected result occurs; if i set LazyLoadingEnabled = false, no children load at all;
When i would have expect it to 'dont be lazy, load it now !'
Whats going on?
entity-framework-6 eager-loading navigation-properties
asked Nov 15 '18 at 5:54
joedotnotjoedotnot
2,01643554
add a comment |
0
Should the following two queries be equivalent?
(note the placement of .Include)
== (V1)
using (var ctx = new Entities())
ctx.Configuration.ProxyCreationEnabled = false; //return stronglyTyped Entity, not dynamic entity...
IQueryable<TB_MyHeader> query = from hd in ctx.TB_MyHeader.Include(h => h.TB_MyLines)
join wo in ctx.TB_AnotherTable on hd.fkId equals wo.ID
where wo.woPk == @id
orderby hd.PoItem
select hd;
var headerPlusLines = query
.AsNoTracking()
.ToList();
return headerPlusLines;
== (V2)
using (var ctx = new Entities())
ctx.Configuration.ProxyCreationEnabled = false; //return stronglyTyped Entity, not dynamic entity...
IQueryable<TB_MyHeader> query = (from hd in ctx.TB_MyHeader
join wo in ctx.TB_AnotherTable on hd.fkId equals wo.ID
where wo.woPk == @id
orderby hd.PoItem
select hd)
.Include(h => h.TB_MyLines);
var headerPlusLines = query
.AsNoTracking()
.ToList();
return headerPlusLines;
The first version (V1) may not fetch children into the Nav property, depending on combinations of how ProxyCreationEnabled, LazyLoadingEnabled are set true/false.
In fact, the opposite of expected result occurs; if i set LazyLoadingEnabled = false, no children load at all;
When i would have expect it to 'dont be lazy, load it now !'
Whats going on?
entity-framework-6 eager-loading navigation-properties
asked Nov 15 '18 at 5:54
joedotnotjoedotnot
2,01643554
Have you had a look at the SQL that Entity Framework generates for both versions? That could shed some light on the different behaviour...
– Alistair Findlay
Nov 15 '18 at 10:19
@Alistair good point.. will look at the gen sql when i get the time (I've forgotten how to do it, any tips?)
– joedotnot
Nov 15 '18 at 10:45
Add this line above thequerydefinition to see the logs generated by Entity Framework, including the generated SQL for your queries:ctx.Database.Log = s => System.Diagnostics.Debug.WriteLine(s);. When you run in debug mode you should see the logs come through in the Output window.
– Alistair Findlay
Nov 15 '18 at 11:31
Thanks: saved me hours on remembering how i did it previously :-)
– joedotnot
Nov 15 '18 at 11:34
add a comment |
0
0
0
Should the following two queries be equivalent?
(note the placement of .Include)
== (V1)
using (var ctx = new Entities())
ctx.Configuration.ProxyCreationEnabled = false; //return stronglyTyped Entity, not dynamic entity...
IQueryable<TB_MyHeader> query = from hd in ctx.TB_MyHeader.Include(h => h.TB_MyLines)
join wo in ctx.TB_AnotherTable on hd.fkId equals wo.ID
where wo.woPk == @id
orderby hd.PoItem
select hd;
var headerPlusLines = query
.AsNoTracking()
.ToList();
return headerPlusLines;
== (V2)
using (var ctx = new Entities())
ctx.Configuration.ProxyCreationEnabled = false; //return stronglyTyped Entity, not dynamic entity...
IQueryable<TB_MyHeader> query = (from hd in ctx.TB_MyHeader
join wo in ctx.TB_AnotherTable on hd.fkId equals wo.ID
where wo.woPk == @id
orderby hd.PoItem
select hd)
.Include(h => h.TB_MyLines);
var headerPlusLines = query
.AsNoTracking()
.ToList();
return headerPlusLines;
The first version (V1) may not fetch children into the Nav property, depending on combinations of how ProxyCreationEnabled, LazyLoadingEnabled are set true/false.
In fact, the opposite of expected result occurs; if i set LazyLoadingEnabled = false, no children load at all;
When i would have expect it to 'dont be lazy, load it now !'
Whats going on?
entity-framework-6 eager-loading navigation-properties
asked Nov 15 '18 at 5:54
joedotnotjoedotnot
2,01643554
Should the following two queries be equivalent?
(note the placement of .Include)
== (V1)
using (var ctx = new Entities())
ctx.Configuration.ProxyCreationEnabled = false; //return stronglyTyped Entity, not dynamic entity...
IQueryable<TB_MyHeader> query = from hd in ctx.TB_MyHeader.Include(h => h.TB_MyLines)
join wo in ctx.TB_AnotherTable on hd.fkId equals wo.ID
where wo.woPk == @id
orderby hd.PoItem
select hd;
var headerPlusLines = query
.AsNoTracking()
.ToList();
return headerPlusLines;
== (V2)
using (var ctx = new Entities())
ctx.Configuration.ProxyCreationEnabled = false; //return stronglyTyped Entity, not dynamic entity...
IQueryable<TB_MyHeader> query = (from hd in ctx.TB_MyHeader
join wo in ctx.TB_AnotherTable on hd.fkId equals wo.ID
where wo.woPk == @id
orderby hd.PoItem
select hd)
.Include(h => h.TB_MyLines);
var headerPlusLines = query
.AsNoTracking()
.ToList();
return headerPlusLines;
The first version (V1) may not fetch children into the Nav property, depending on combinations of how ProxyCreationEnabled, LazyLoadingEnabled are set true/false.
In fact, the opposite of expected result occurs; if i set LazyLoadingEnabled = false, no children load at all;
When i would have expect it to 'dont be lazy, load it now !'
Whats going on?
entity-framework-6 eager-loading navigation-properties
entity-framework-6 eager-loading navigation-properties
asked Nov 15 '18 at 5:54
joedotnotjoedotnot
2,01643554
asked Nov 15 '18 at 5:54
joedotnotjoedotnot
2,01643554
asked Nov 15 '18 at 5:54
joedotnotjoedotnot
2,01643554
asked Nov 15 '18 at 5:54
joedotnotjoedotnot
2,01643554
asked Nov 15 '18 at 5:54
joedotnotjoedotnot
2,01643554
2,01643554
Have you had a look at the SQL that Entity Framework generates for both versions? That could shed some light on the different behaviour...
– Alistair Findlay
Nov 15 '18 at 10:19
@Alistair good point.. will look at the gen sql when i get the time (I've forgotten how to do it, any tips?)
– joedotnot
Nov 15 '18 at 10:45
Add this line above thequerydefinition to see the logs generated by Entity Framework, including the generated SQL for your queries:ctx.Database.Log = s => System.Diagnostics.Debug.WriteLine(s);. When you run in debug mode you should see the logs come through in the Output window.
– Alistair Findlay
Nov 15 '18 at 11:31
Thanks: saved me hours on remembering how i did it previously :-)
– joedotnot
Nov 15 '18 at 11:34
add a comment |
Have you had a look at the SQL that Entity Framework generates for both versions? That could shed some light on the different behaviour...
– Alistair Findlay
Nov 15 '18 at 10:19
@Alistair good point.. will look at the gen sql when i get the time (I've forgotten how to do it, any tips?)
– joedotnot
Nov 15 '18 at 10:45
Add this line above thequerydefinition to see the logs generated by Entity Framework, including the generated SQL for your queries:ctx.Database.Log = s => System.Diagnostics.Debug.WriteLine(s);. When you run in debug mode you should see the logs come through in the Output window.
– Alistair Findlay
Nov 15 '18 at 11:31
Thanks: saved me hours on remembering how i did it previously :-)
– joedotnot
Nov 15 '18 at 11:34
Have you had a look at the SQL that Entity Framework generates for both versions? That could shed some light on the different behaviour...
– Alistair Findlay
Nov 15 '18 at 10:19
Have you had a look at the SQL that Entity Framework generates for both versions? That could shed some light on the different behaviour...
– Alistair Findlay
Nov 15 '18 at 10:19
@Alistair good point.. will look at the gen sql when i get the time (I've forgotten how to do it, any tips?)
– joedotnot
Nov 15 '18 at 10:45
@Alistair good point.. will look at the gen sql when i get the time (I've forgotten how to do it, any tips?)
– joedotnot
Nov 15 '18 at 10:45
Add this line above the
query definition to see the logs generated by Entity Framework, including the generated SQL for your queries: ctx.Database.Log = s => System.Diagnostics.Debug.WriteLine(s);. When you run in debug mode you should see the logs come through in the Output window.– Alistair Findlay
Nov 15 '18 at 11:31
Add this line above the
query definition to see the logs generated by Entity Framework, including the generated SQL for your queries: ctx.Database.Log = s => System.Diagnostics.Debug.WriteLine(s);. When you run in debug mode you should see the logs come through in the Output window.– Alistair Findlay
Nov 15 '18 at 11:31
Thanks: saved me hours on remembering how i did it previously :-)
– joedotnot
Nov 15 '18 at 11:34
Thanks: saved me hours on remembering how i did it previously :-)
– joedotnot
Nov 15 '18 at 11:34
add a comment |
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Have you had a look at the SQL that Entity Framework generates for both versions? That could shed some light on the different behaviour...
– Alistair Findlay
Nov 15 '18 at 10:19
@Alistair good point.. will look at the gen sql when i get the time (I've forgotten how to do it, any tips?)
– joedotnot
Nov 15 '18 at 10:45
Add this line above the
querydefinition to see the logs generated by Entity Framework, including the generated SQL for your queries:ctx.Database.Log = s => System.Diagnostics.Debug.WriteLine(s);. When you run in debug mode you should see the logs come through in the Output window.– Alistair Findlay
Nov 15 '18 at 11:31
Thanks: saved me hours on remembering how i did it previously :-)
– joedotnot
Nov 15 '18 at 11:34