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.
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)));
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);
}
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>());
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());
using System.Linq; to the using sectionIt seems to me, the safest way:
listString.AddRange(arrayList.ToArray().Select(e => e.ToString()));
ArrayList arrayList = new ArrayList {"A","B","C" };
List<string> listString = new List<string>();
foreach (string item in arrayList)
{
listString.Add(item);
}
var data = listString;
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 );
