CODEWITHSUNDEEP
c#.netstringlistarraylist
Arpit Gupta
Arpit Gupta

Reputation: 1277

C# Convert ArrayList to List of string?

I have an ArrayList, need to add the items of ArrayList into a List of string. I tried the following:

listString.AddRange(new List<string>((string[])this.arrayList.ToArray()))

But this gives an exception of

Unable to cast object of type 'System.Object[]' to type 'System.String[]'

Please note :; I can't use .Cast as I am working in framework 4.0.

Upvotes: 2

Views: 6831

Answers (7)

lashja
lashja

Reputation: 493

ArrayList arrayList = new ArrayList {"A","B","C" };
List<string> listString = new List<string>();  
foreach (string item in arrayList)
{
    listString.Add(item);
}
var data = listString;

Upvotes: 0

Raju Mali
Raju Mali

Reputation: 185

Try to understand below code : this code solve problem.

ArrayList myAL = new ArrayList(); 
myAL.Add( "The" );
myAL.Add( "quick" );    
myAL.Add( "brown" ); 
myAL.Add( "fox" ); 

// Creates and initializes a new Queue.
Queue myQueue = new Queue();
myQueue.Enqueue( "jumped" ); 
myQueue.Enqueue( "over" ); 

// Displays the ArrayList and the Queue.  
Console.WriteLine( "The ArrayList initially contains the following:" );
PrintValues( myAL, '\t' );
Console.WriteLine( "The Queue initially contains the following:" ); 
PrintValues( myQueue, '\t' ); 

// Copies the Queue elements to the end of the ArrayList. 
myAL.AddRange( myQueue );

Upvotes: -4

sayani sur
sayani sur

Reputation: 44

You can try the below code as follows:

ArrayList al = new ArrayList();
 List<string> lst = new List<string>();
 foreach (string l in al)
 {
    lst.Add(l);
 }

Upvotes: 3

MirrorBoy
MirrorBoy

Reputation: 879

It seems to me, the safest way:

listString.AddRange(arrayList.ToArray().Select(e => e.ToString()));

Upvotes: 1

Svein Fidjest&#248;l
Svein Fidjest&#248;l

Reputation: 3206

Use ToArray(typeof(string)) to create an Array and then cast it to a more specific array type string[] before adding it to the variable of type List<string>

listString.AddRange((string[])this.arrayList.ToArray(typeof(string)));

Upvotes: 4

MarkO
MarkO

Reputation: 2233

LINQ to objects has a Cast method, which returns an IEnumerable of T where all the types have been cast (assuming the cast is valid) , so i'd suggest:

this.ArrayList.Cast<string>().ToList();

or, if your listString is already existing:

listString.AddRange(this.ArrayList.Cast<string>());

Upvotes: 2

sujith karivelil
sujith karivelil

Reputation: 29016

You have to convert each elements of the array list into a string to add them in a List of strings. Better option for doing this is like the following:

 listString.AddRange(arrayList.ToArray().Select(x => x.ToString()).ToList());

Upvotes: 1

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