How to Generate All Possible Combinations of a List in C#?

Generate list of all possible combinations

In C#, you may encounter situations where you need to process a list of integers but don't know the number of items until runtime. To solve this situation, it is crucial to find all possible combinations of lists.

To do this, you can utilize a mathematical method:

<code class="language-csharp">static void GetCombination(List<int> list)
{
    double count = Math.Pow(2, list.Count);
    for (int i = 1; i < count; i++)
    {
        string str = Convert.ToString(i, 2);
        str = str.PadLeft(list.Count, '0');
        Console.Write("{");
        for (int j = 0; j < str.Length; j++)
        {
            if (str[j] == '1')
            {
                Console.Write(list[j] + ",");
            }
        }
        Console.WriteLine("}");
    }
}</code>

This method:

• Use 2^list.Count to calculate the total number of combinations.
• Convert each combined index i to its binary representation as a string str.
• Pad the string with leading zeros to match the list length.
• Iterate over the characters in str. If the character is '1', the corresponding element in the list is output.
• Repeat this operation for each index i, thus generating all possible combinations.

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