C# | OrderedDictionary.Item[Object] Property
Last Updated :
11 Jul, 2025
There are two methods in the overload list of this property as follows:
- Item[Int32] : Used to get or set the value at the specified index.
- Item[Object] : Used to get or set the value with the specified key.
OrderedDictionary.Item[Int32] Property
This property is used to get or set the value at the specified index.
Syntax:
public object this[int index] { get; set; }
Here, index is the zero-based index of the value to get or set.
Return Value: The value of the item at the specified index.
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:
CSHARP
// C# code to get or set the value
// at the specified index for
// OrderedDictionary
using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver method
public static void Main()
{
// Creating a orderedDictionary named myDict
OrderedDictionary myDict = new OrderedDictionary();
// Adding key and value in myDict
myDict.Add("key1", "value1");
myDict.Add("key2", "value2");
myDict.Add("key3", "value3");
myDict.Add("key4", "value4");
myDict.Add("key5", "value5");
// To get or set the value at the
// specified index for OrderedDictionary
Console.WriteLine(myDict[1]);
}
}
Output:
value2
Example 2:
CSHARP
// C# code to get or set the value
// at the specified index for
// OrderedDictionary
using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver method
public static void Main()
{
// Creating a orderedDictionary named myDict
OrderedDictionary myDict = new OrderedDictionary();
// Adding key and value in myDict
myDict.Add("key1", "value1");
myDict.Add("key2", "value2");
myDict.Add("key3", "value3");
myDict.Add("key4", "value4");
myDict.Add("key5", "value5");
// To get or set the value at the
// specified index for OrderedDictionary
// This should raise "ArgumentOutOfRangeException"
// as index is less than 0
Console.WriteLine(myDict[-3]);
}
}
Runtime Error:
Unhandled Exception:
System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
Note: This property allows you to access a specific element in the collection by using the syntax : myCollection[index].
OrderedDictionary.Item[Object] Property
This property is used to get or set the value with the specified key.
Syntax:
public object this[object key] { get; set; }
Here, key is the key of the value to get or set.
Return Value: The value associated with the specified key. If the specified key is not found, attempting to get it returns null, and attempting to set it creates a new element using the specified key.
Exception : This property will give NotSupportedException if the property is being set and the OrderedDictionary collection is read-only.
Example:
CSHARP
// C# code to get or set the
// value with the specified key
using System;
using System.Collections;
using System.Collections.Specialized;
class GFG {
// Driver method
public static void Main()
{
// Creating a orderedDictionary named myDict
OrderedDictionary myDict = new OrderedDictionary();
// Adding key and value in myDict
myDict.Add("key1", "value1");
myDict.Add("key2", "value2");
myDict.Add("key3", "value3");
myDict.Add("key4", "value4");
myDict.Add("key5", "value5");
// To get or set the value
// with the specified key
Console.WriteLine(myDict["key3"]);
}
}
Output:
value3
Note:
- This property allows you to access a specific element in the collection by using the syntax : myCollection[key].
- A key cannot be null, but a value can be.
Reference: