What is default value of `KeyValuePair<string, int>` in C#?

What is default value of `KeyValuePair<string, int>` in C#?

The default value of KeyValuePair<string, int> in C# is a new instance of KeyValuePair<string, int> with the default values for its fields.

The default value for a string is null, and the default value for an int is 0.

So, the default value of KeyValuePair<string, int> is a new instance with null as the Key and 0 as the Value.

You can check the default value of a KeyValuePair<string, int> instance using the default keyword:

KeyValuePair<string, int> pair = default(KeyValuePair<string, int>); Console.WriteLine(pair.Key); // Outputs "null" Console.WriteLine(pair.Value); // Outputs "0"

In this example, we create a new instance of KeyValuePair<string, int> using the default keyword and assign it to a variable named pair. We then print the values of pair.Key and pair.Value, which will be null and 0, respectively.

Examples

  1. Default value of KeyValuePair<string, int> in C#

    • Description: This query aims to understand the default value assigned to a KeyValuePair<string, int> in C#. KeyValuePair is a struct, so it has a default value even if not explicitly initialized.
    • Code:
      var defaultKeyValuePair = default(KeyValuePair<string, int>); Console.WriteLine($"Default Key: {defaultKeyValuePair.Key}, Default Value: {defaultKeyValuePair.Value}"); // Output: Default Key: , Default Value: 0

  2. C# KeyValuePair<string, int> default initialization

    • Description: Users may want to know how to explicitly initialize a KeyValuePair<string, int> to its default value in C#.
    • Code:
      KeyValuePair<string, int> kvp = default; Console.WriteLine($"Default Key: {kvp.Key}, Default Value: {kvp.Value}"); // Output: Default Key: , Default Value: 0

  3. How to check if a KeyValuePair<string, int> is default in C#

    • Description: This query pertains to determining whether a KeyValuePair<string, int> instance has been assigned its default value in C#.
    • Code:
      KeyValuePair<string, int> pair = new KeyValuePair<string, int>(); bool isDefault = pair.Equals(default(KeyValuePair<string, int>)); Console.WriteLine($"Is default value? {isDefault}"); // Output: Is default value? True

  4. C# KeyValuePair<string, int> default value comparison

    • Description: Users may be interested in comparing a KeyValuePair<string, int> instance with its default value in C#.
    • Code:
      KeyValuePair<string, int> pair = new KeyValuePair<string, int>("test", 10); bool isEqualToDefault = pair.Equals(default(KeyValuePair<string, int>)); Console.WriteLine($"Is equal to default value? {isEqualToDefault}"); // Output: Is equal to default value? False

  5. Initializing KeyValuePair<string, int> with default value in C#

    • Description: This query involves initializing a KeyValuePair<string, int> to its default value explicitly during declaration in C#.
    • Code:
      KeyValuePair<string, int> kvp = default; Console.WriteLine($"Default Key: {kvp.Key}, Default Value: {kvp.Value}"); // Output: Default Key: , Default Value: 0

  6. C# KeyValuePair<string, int> default value assignment

    • Description: Users may want to know how the default value is assigned to a KeyValuePair<string, int> in C# implicitly.
    • Code:
      KeyValuePair<string, int> kvp = default; Console.WriteLine($"Default Key: {kvp.Key}, Default Value: {kvp.Value}"); // Output: Default Key: , Default Value: 0

  7. How to handle default value of KeyValuePair<string, int> in C#

    • Description: This query relates to strategies for dealing with default values of KeyValuePair<string, int> instances in C#.
    • Code:
      KeyValuePair<string, int> pair = new KeyValuePair<string, int>(); if (pair.Equals(default(KeyValuePair<string, int>))) { Console.WriteLine("Handle default value here."); }

  8. C# default value of KeyValuePair<string, int> usage

    • Description: Users may be interested in practical applications of default values for KeyValuePair<string, int> instances in C#.
    • Code:
      // Example usage of default value Dictionary<string, int> dictionary = new Dictionary<string, int>(); KeyValuePair<string, int> defaultPair = default; dictionary.Add(defaultPair.Key, defaultPair.Value);

  9. C# KeyValuePair<string, int> default value initialization

    • Description: This query involves understanding how a KeyValuePair<string, int> instance can be initialized to its default value explicitly.
    • Code:
      KeyValuePair<string, int> kvp = default; Console.WriteLine($"Default Key: {kvp.Key}, Default Value: {kvp.Value}"); // Output: Default Key: , Default Value: 0

  10. Comparing KeyValuePair<string, int> with default value in C#

    • Description: Users may want to compare a KeyValuePair<string, int> instance with its default value in C#.
    • Code:
      KeyValuePair<string, int> pair = new KeyValuePair<string, int>("example", 5); bool isDefault = pair.Equals(default(KeyValuePair<string, int>)); Console.WriteLine($"Is default value? {isDefault}"); // Output: Is default value? False

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