Looping through dictionary object

Question

I am very new to  NET  used to working in PHP  I need to iterate via foreach through a dictionary of objects  My setup is an MVC4 app   The Model looks like this    public class TestModels       Dictionary lt int  dynamic gt  sp   new Dictionary lt int  dynamic gt                 1  new  name  abc   age  1              2  new  name  def   age  2              Controller    public class TestController   Controller      Models TestModels obj   new Models TestModels        How do I loop through the obj object and retrieve the values of the dictionary and print them in the view

User · Answer

One way is to loop through the keys of the dictionary, which I recommend:

foreach(int key in sp.Keys)
    dynamic value = sp[key];

Another way, is to loop through the dictionary as a sequence of pairs:

foreach(KeyValuePair<int, dynamic> pair in sp)
{
    int key = pair.Key;
    dynamic value = pair.Value;
}

I recommend the first approach, because you can have more control over the order of items retrieved if you decorate the Keys property with proper LINQ statements, e.g., sp.Keys.OrderBy(x => x) helps you retrieve the items in ascending order of the key. Note that Dictionary uses a hash table data structure internally, therefore if you use the second method the order of items is not easily predictable.

Update (01 Dec 2016): replaced vars with actual types to make the answer more clear.

User · Answer

It depends on what you are after in the Dictionary  Models TestModels obj   new Models TestModels     foreach  var keyValuPair in obj sp           KeyValuePair lt int  dynamic gt     foreach  var key in obj sp Keys            Int     foreach  var value in obj sp Values           dynamic

User · Answer

public class TestModels       public Dictionary lt int  dynamic gt  sp   new Dictionary lt int  dynamic gt          public TestModels                 sp Add 0  new  name  Test One   age 5            sp Add 1  new  name  Test Two   age 7

User · Answer

You can do it like this   Models TestModels obj   new Models TestModels    foreach  var item in obj sp        Console Write item Key       Console Write item Value name       Console Write item Value age       The problem you most likely have right now is that the collection is private  If you add public to the beginning of this line  Dictionary lt int  dynamic gt  sp   new Dictionary lt int  dynamic gt     You should be able to access it from the function inside your controller   Edit  Adding functional example of the full TestModels implementation   Your TestModels class should look something like this   public class TestModels       public Dictionary lt int  dynamic gt  sp   new Dictionary lt int  dynamic gt          public TestModels                 sp Add 0  new  name  Test One   age 5            sp Add 1  new  name  Test Two   age 7              You probably want to read up on the dynamic keyword as well

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