How to Sort Strings Numerically While Maintaining Alphabetical Order?-C++-php.cn

How to Sort Strings Numerically While Maintaining Alphabetical Order?

Barbara Streisand

Release： 2024-12-31 02:19:14

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How to Sort Strings Numerically While Maintaining Alphabetical Order?

Sorting Strings Numerically While Preserving Alphabetical Order

To resolve the issue of sorting strings that are numeric but cannot be converted to integers, you can implement a custom sorting algorithm. Here's how to do it:

Utilize the Enumerable.OrderBy method, which allows you to specify a custom comparer for sorting.
Create a class that implements the IComparer interface and defines the logic for comparing strings.
Implement the Compare method within the custom comparer class to determine the ordering of strings.
Here's an example implementation of the SemiNumericComparer class that considers both numeric and alphabetical values:

public class SemiNumericComparer : IComparer<string>
{
    public static bool IsNumeric(string value) => int.TryParse(value, out _);

    public int Compare(string s1, string s2)
    {
        const int S1GreaterThanS2 = 1;
        const int S2GreaterThanS1 = -1;

        var isNumeric1 = IsNumeric(s1);
        var isNumeric2 = IsNumeric(s2);

        // Handle numeric comparisons
        if (isNumeric1 && isNumeric2)
        {
            var i1 = Convert.ToInt32(s1);
            var i2 = Convert.ToInt32(s2);

            return i1 > i2 ? S1GreaterThanS2 : (i1 < i2 ? S2GreaterThanS1 : 0);
        }

        // Handle mixed numeric and non-numeric comparisons
        if (isNumeric1) return S2GreaterThanS1;
        if (isNumeric2) return S1GreaterThanS2;

        // Handle alphabetical comparisons
        return string.Compare(s1, s2, true, CultureInfo.InvariantCulture);
    }
}

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Integrate the custom comparer into your sorting logic:

string[] things = new string[] { "paul", "bob", "lauren", "007", "90", "101" };

foreach (var thing in things.OrderBy(x => x, new SemiNumericComparer()))
{
    Console.WriteLine(thing);
}

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This approach allows you to sort strings alphabetically while accounting for numeric values, resulting in the desired output:

007
90
bob
lauren
paul

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