Question

How to store A Multiple key vlaue pair

Asked by: Win111

How can we store Same key with different values in c#.
Something like this
I need (Root1 , Object 1)
(Root1 ,Object2)
(Root1,Object3)

Object 1, object2, object3  are c# class object.
I.e Multi value dictionary

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Asked On
2009-08-27 at 11:50:38ID24687716
Topic

Microsoft Visual C#.Net

Participating Experts
3
Points
500
Comments
12

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Answers

 

by: efg-uaePosted on 2009-08-27 at 12:05:42ID: 25201532

Hi

Create an Object Array and store into it.

object[] ga = new object[10];
 
Store you objects into it.

 

by: RyanAndresPosted on 2009-08-27 at 12:13:13ID: 25201596

Use generic Dictionary and a List of objects or an array of objects.

Dictionary<string, List<object>> dictionary = new Dictionary<string, List<object>>();
 
List<object> objects = new List<object>();
objects.Add(Object1);
objects.Add(Object2);
objects.Add(Object3);
 
dictionary.Add("Root1", objects);

                                              
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by: Win111Posted on 2009-08-27 at 12:37:18ID: 25201804

But Dictionary does not allow Same key twice

 

by: RyanAndresPosted on 2009-08-27 at 12:53:54ID: 25201998

Then use a List of KeyValuePair.

List<KeyValuePair<string, object[]>>

 

by: Win111Posted on 2009-08-27 at 13:12:04ID: 25202167

Can you please provide an example of the above. showing insertion and Retrieval

 

by: packratt_jkPosted on 2009-08-27 at 13:17:22ID: 25202226

Another option would be to make a two-level dictionary

Dictionary<string, Dictionary<string, object>>


But you'd need another key to keep them appart.


I think RyanAndres's original comment is what I would go with first though.

 

by: RyanAndresPosted on 2009-08-27 at 13:37:11ID: 25202438

Here's an example.

The lines are pretty long but you could also use the var keyword to shorten the beginning of the first 4 statements.

List<KeyValuePair<string, object>> list = new List<KeyValuePair<string, object>>();
 
KeyValuePair<string, object> item1 = new KeyValuePair<string, object>("Root1", Object1);
KeyValuePair<string, object> item2 = new KeyValuePair<string, object>("Root1", Object2);
KeyValuePair<string, object> item3 = new KeyValuePair<string, object>("Root1", Object3);
 
list.Add(item1);
list.Add(item2);
list.Add(item2);

                                              
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by: packratt_jkPosted on 2009-08-27 at 13:48:47ID: 25202556

The downside of List<KeyValuePair<string, object>> though is that you wouldn't be able to index into it, you'd have to iterate through it each time to look for a specific value.

If you are interested in getting a value for a particular key, this would be a lot slower than the Dictionary<string, List<object>> method

 

by: RyanAndresPosted on 2009-08-27 at 14:08:37ID: 25202728

You could always use LINQ to search for a value.

The following will return all items matching key "Root1".

list.Where(k => k.Key == "Root1").ToList();

                                              
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by: packratt_jkPosted on 2009-09-23 at 08:45:42ID: 25404541

I think Ryan should be awarded the points on comment ID 25201596.  His answer is a simple, direct answer to the question.

20120131-EE-VQP-002

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