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How to add the object to a collection from another object?

How do I add objects to an ICollection property? Do I need to initialize the ICollection first? If so how?

I have a Class 'foo' that has an ICollection<bar> property named 'bar'. I also have a separate Collection of objects containing deserialized excel data. I want to populate the ICollection<bar> bar property using this data.

ICollection<bar>

ICollection<bar> bar

Assuming I have an instance of foo called 'fooexample' then I am trying to assign a value to the ICollection<bar> bar by using 'fooexample.bar.id' but I know that this is syntactically incorrect.

foo

ICollection<bar> bar

Class foo

public class foo

public int id get; set;
public string name get; set;
public ICollection<bar> bar get; set;



Class bar

public class bar

public int id get; set;
public string name get; set;



Adding objects from another object

exceldata = ParseDocument.Parse(filestream);
foo fooexample = new foo();
foreach (var object in exceldata)

fooexample.id = object.id;
fooexample.bar.id = object.bar.id;
// <-- how do I do this? if I need to initialize it, how?



exceldata

public ICollection<bar> bar get; = new List<bar>();

fooExample.bar.Add(new bar id = obj.id, name = obj.bar.name );

ICollection<bar> bar

public ICollection<bar> bar get; = new List<bar>();

fooexample.bar.id

fooexample.bar

fooexample.bar[0].id

1 Answer
1

I get the impression you dont actually need a collection so you could do the following.

Class foo

public class foo

public int id get; set;
public string name get; set;
public bar bar get; set;



Adding objects from another object

exceldata = ParseDocument.Parse(filestream);
foo fooexample = new foo();
foreach (var object in exceldata)

fooexample.id = object.id;
fooexample.bar = new bar();
fooexample.bar.id = object.bar.id;



There is a shorthand in C# to instantiate an object and set it's properties on one line so you could alternatively have

exceldata = ParseDocument.Parse(filestream);
foo fooexample = new foo();
foreach (var object in exceldata)

fooexample.id = object.id;
fooexample.bar = new bar(id = object.bar.id);



Or using a collection

Class foo

public class foo

public int id get; set;
public string name get; set;
public ICollection<bar> bar get; set;



Adding objects from another object

exceldata = ParseDocument.Parse(filestream);
foo fooexample = new foo();
fooexample.bar = new List<bar>();
foreach (var object in exceldata)

fooexample.id = object.id;
fooexample.bar.Add(new bar(id = object.bar.id));



As others have noted you could alternatively initialize the List in the 'foo' class.

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