C# | Remove the entry at specified index from OrderedDictionary
Last Updated :
01 Feb, 2019
OrderedDictionary.RemoveAt(Int32) method is used to remove the entry at the specified index from the OrderedDictionary collection.
Syntax:
public void RemoveAt (int index);
Here, index is the zero-based index of the entry to remove.
Exceptions:
- NotSupportedException : If the OrderedDictionary collection is read-only.
- ArgumentOutOfRangeException : If the index is less than zero OR index is equal to or greater than Count.
Below given are some examples to understand the implementation in a better way:
Example 1:
using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
public static void Main()
{
OrderedDictionary myDict = new OrderedDictionary();
myDict.Add( "key1" , "value1" );
myDict.Add( "key2" , "value2" );
myDict.Add( "key3" , "value3" );
myDict.Add( "key4" , "value4" );
myDict.Add( "key5" , "value5" );
Console.WriteLine( "Number of elements are : "
+ myDict.Count);
foreach (DictionaryEntry de in myDict)
Console.WriteLine(de.Key + " -- " + de.Value);
myDict.RemoveAt(3);
Console.WriteLine( "Number of elements are : "
+ myDict.Count);
foreach (DictionaryEntry de in myDict)
Console.WriteLine(de.Key + " -- " + de.Value);
}
}
|
Output:
Number of elements are : 5
key1 -- value1
key2 -- value2
key3 -- value3
key4 -- value4
key5 -- value5
Number of elements are : 4
key1 -- value1
key2 -- value2
key3 -- value3
key5 -- value5
Example 2:
using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
public static void Main()
{
OrderedDictionary myDict = new OrderedDictionary();
myDict.Add( "A" , "Apple" );
myDict.Add( "B" , "Banana" );
myDict.Add( "C" , "Cat" );
myDict.Add( "D" , "Dog" );
Console.WriteLine( "Number of elements are : "
+ myDict.Count);
foreach (DictionaryEntry de in myDict)
Console.WriteLine(de.Key + " -- " + de.Value);
myDict.RemoveAt(-2);
Console.WriteLine( "Number of elements are : "
+ myDict.Count);
foreach (DictionaryEntry de in myDict)
Console.WriteLine(de.Key + " -- " + de.Value);
}
}
|
Runtime Error:
Unhandled Exception:
System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: index
Note: The entries that follow the removed entry move up to occupy the vacated spot and the indexes of the entries that move are also updated.
Reference:
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