How to add an array to a Mongo entity class?
I want to use List<> to create an array. For example:
Class Test{
public ObjectId Id {get;set;}
public string name {get;set;}
public List<Field> fields {get;set;}
}
Class Field{
public ObjectId Id {get;set;}
public string name {get;set;}
public string value {get;set;}
......
}
This is the code for saving it to the database:
var a = new Test();
a.name = "Saw";
var field1 = new Field();
field1.name="BIZMSGID";
a.fields = new List<Field>();
a.fields.Append(field1);
var collection = database.GetCollection<Test>("test");
collection.InsertOne(a);
And the result is this.(In Linqpad)
Why the field1 is not effective?
c# mongodb
edited Nov 13 '18 at 2:13
John
11.3k31737
asked Nov 13 '18 at 1:43
Sol Badguy
195
add a comment |
I want to use List<> to create an array. For example:
Class Test{
public ObjectId Id {get;set;}
public string name {get;set;}
public List<Field> fields {get;set;}
}
Class Field{
public ObjectId Id {get;set;}
public string name {get;set;}
public string value {get;set;}
......
}
This is the code for saving it to the database:
var a = new Test();
a.name = "Saw";
var field1 = new Field();
field1.name="BIZMSGID";
a.fields = new List<Field>();
a.fields.Append(field1);
var collection = database.GetCollection<Test>("test");
collection.InsertOne(a);
And the result is this.(In Linqpad)
Why the field1 is not effective?
c# mongodb
edited Nov 13 '18 at 2:13
John
11.3k31737
asked Nov 13 '18 at 1:43
Sol Badguy
195
add a comment |
I want to use List<> to create an array. For example:
Class Test{
public ObjectId Id {get;set;}
public string name {get;set;}
public List<Field> fields {get;set;}
}
Class Field{
public ObjectId Id {get;set;}
public string name {get;set;}
public string value {get;set;}
......
}
This is the code for saving it to the database:
var a = new Test();
a.name = "Saw";
var field1 = new Field();
field1.name="BIZMSGID";
a.fields = new List<Field>();
a.fields.Append(field1);
var collection = database.GetCollection<Test>("test");
collection.InsertOne(a);
And the result is this.(In Linqpad)
Why the field1 is not effective?
c# mongodb
edited Nov 13 '18 at 2:13
John
11.3k31737
asked Nov 13 '18 at 1:43
Sol Badguy
195
I want to use List<> to create an array. For example:
Class Test{
public ObjectId Id {get;set;}
public string name {get;set;}
public List<Field> fields {get;set;}
}
Class Field{
public ObjectId Id {get;set;}
public string name {get;set;}
public string value {get;set;}
......
}
This is the code for saving it to the database:
var a = new Test();
a.name = "Saw";
var field1 = new Field();
field1.name="BIZMSGID";
a.fields = new List<Field>();
a.fields.Append(field1);
var collection = database.GetCollection<Test>("test");
collection.InsertOne(a);
And the result is this.(In Linqpad)
Why the field1 is not effective?
c# mongodb
c# mongodb
edited Nov 13 '18 at 2:13
John
11.3k31737
asked Nov 13 '18 at 1:43
Sol Badguy
195
edited Nov 13 '18 at 2:13
John
11.3k31737
asked Nov 13 '18 at 1:43
Sol Badguy
195
edited Nov 13 '18 at 2:13
John
11.3k31737
edited Nov 13 '18 at 2:13
John
11.3k31737
edited Nov 13 '18 at 2:13
John
11.3k31737
11.3k31737
asked Nov 13 '18 at 1:43
Sol Badguy
195
asked Nov 13 '18 at 1:43
Sol Badguy
195
asked Nov 13 '18 at 1:43
Sol Badguy
195
195
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
You're using the LINQ method Append:
a.fields.Append(field1);
The remarks section of the documentation for Append states:
This method does not modify the elements of the collection. Instead, it creates a copy of the collection with the new element.
So, in short: you're not modifying a.fields, you're creating a LINQ view that has field1 as the last item.
You should use the List's add method:
a.fields.Add(field1);
answered Nov 13 '18 at 2:12
John
11.3k31737
Thanks,Seems I have a wrong understanding for Linq methods :(
– Sol Badguy
Nov 13 '18 at 2:18
1
@Sol LINQ methods that returnIGroupingorIEnumerableare just views of the original collection -.Append()is one such method. See this example.
– John
Nov 13 '18 at 2:50
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
You're using the LINQ method Append:
a.fields.Append(field1);
The remarks section of the documentation for Append states:
This method does not modify the elements of the collection. Instead, it creates a copy of the collection with the new element.
So, in short: you're not modifying a.fields, you're creating a LINQ view that has field1 as the last item.
You should use the List's add method:
a.fields.Add(field1);
answered Nov 13 '18 at 2:12
John
11.3k31737
Thanks,Seems I have a wrong understanding for Linq methods :(
– Sol Badguy
Nov 13 '18 at 2:18
1
@Sol LINQ methods that returnIGroupingorIEnumerableare just views of the original collection -.Append()is one such method. See this example.
– John
Nov 13 '18 at 2:50
add a comment |
You're using the LINQ method Append:
a.fields.Append(field1);
The remarks section of the documentation for Append states:
This method does not modify the elements of the collection. Instead, it creates a copy of the collection with the new element.
So, in short: you're not modifying a.fields, you're creating a LINQ view that has field1 as the last item.
You should use the List's add method:
a.fields.Add(field1);
answered Nov 13 '18 at 2:12
John
11.3k31737
Thanks,Seems I have a wrong understanding for Linq methods :(
– Sol Badguy
Nov 13 '18 at 2:18
1
@Sol LINQ methods that returnIGroupingorIEnumerableare just views of the original collection -.Append()is one such method. See this example.
– John
Nov 13 '18 at 2:50
add a comment |
You're using the LINQ method Append:
a.fields.Append(field1);
The remarks section of the documentation for Append states:
This method does not modify the elements of the collection. Instead, it creates a copy of the collection with the new element.
So, in short: you're not modifying a.fields, you're creating a LINQ view that has field1 as the last item.
You should use the List's add method:
a.fields.Add(field1);
answered Nov 13 '18 at 2:12
John
11.3k31737
You're using the LINQ method Append:
a.fields.Append(field1);
The remarks section of the documentation for Append states:
This method does not modify the elements of the collection. Instead, it creates a copy of the collection with the new element.
So, in short: you're not modifying a.fields, you're creating a LINQ view that has field1 as the last item.
You should use the List's add method:
a.fields.Add(field1);
answered Nov 13 '18 at 2:12
John
11.3k31737
answered Nov 13 '18 at 2:12
John
11.3k31737
answered Nov 13 '18 at 2:12
John
11.3k31737
answered Nov 13 '18 at 2:12
John
11.3k31737
11.3k31737
Thanks,Seems I have a wrong understanding for Linq methods :(
– Sol Badguy
Nov 13 '18 at 2:18
1
@Sol LINQ methods that returnIGroupingorIEnumerableare just views of the original collection -.Append()is one such method. See this example.
– John
Nov 13 '18 at 2:50
add a comment |
Thanks,Seems I have a wrong understanding for Linq methods :(
– Sol Badguy
Nov 13 '18 at 2:18
1
@Sol LINQ methods that returnIGroupingorIEnumerableare just views of the original collection -.Append()is one such method. See this example.
– John
Nov 13 '18 at 2:50
Thanks,Seems I have a wrong understanding for Linq methods :(
– Sol Badguy
Nov 13 '18 at 2:18
Thanks,Seems I have a wrong understanding for Linq methods :(
– Sol Badguy
Nov 13 '18 at 2:18
1
1
@Sol LINQ methods that return
IGrouping or IEnumerable are just views of the original collection - .Append() is one such method. See this example.– John
Nov 13 '18 at 2:50
@Sol LINQ methods that return
IGrouping or IEnumerable are just views of the original collection - .Append() is one such method. See this example.– John
Nov 13 '18 at 2:50
add a comment |
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