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
12.1k32039
asked Nov 13 '18 at 1:43
Sol BadguySol 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
12.1k32039
asked Nov 13 '18 at 1:43
Sol BadguySol 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
12.1k32039
asked Nov 13 '18 at 1:43
Sol BadguySol 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
12.1k32039
asked Nov 13 '18 at 1:43
Sol BadguySol Badguy
195
edited Nov 13 '18 at 2:13
John
12.1k32039
asked Nov 13 '18 at 1:43
Sol BadguySol Badguy
195
edited Nov 13 '18 at 2:13
John
12.1k32039
edited Nov 13 '18 at 2:13
John
12.1k32039
edited Nov 13 '18 at 2:13
John
12.1k32039
12.1k32039
asked Nov 13 '18 at 1:43
Sol BadguySol Badguy
195
asked Nov 13 '18 at 1:43
Sol BadguySol Badguy
195
asked Nov 13 '18 at 1:43
Sol BadguySol 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
JohnJohn
12.1k32039
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 |
Your Answer
StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53272574%2fhow-to-add-an-array-to-a-mongo-entity-class%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
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
JohnJohn
12.1k32039
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
JohnJohn
12.1k32039
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
JohnJohn
12.1k32039
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
JohnJohn
12.1k32039
answered Nov 13 '18 at 2:12
JohnJohn
12.1k32039
answered Nov 13 '18 at 2:12
JohnJohn
12.1k32039
answered Nov 13 '18 at 2:12
JohnJohn
12.1k32039
12.1k32039
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 |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53272574%2fhow-to-add-an-array-to-a-mongo-entity-class%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
