Question: Is There A Way To Format White-space Like This In C#?

问题

Is There A Way To Format White-space Like This In C#?

I would like to know if you could parse string arrays into a method and get it to return you a formatted string with white-spaces, there is a specific way i need this done so here's an example:

string[][] StringArray = new string[][] {
    new string[] {"Name:", "John Jones."}
    new string[] {"Date of birth:", "07/11/1989."}
    new string[] {"Age:", "29 Years old."}
};

FormatWhiteSpace(StringArray, Padding: 5);

Output would be:

Name:              John Jones.
Date of birth:     07/11/1989.
Age:               29 Years old.

As you see above in the output everything is lined up and with 5 spaces for padding as defined when we called the method. This is exactly what we want. Also we have a 2 dimensional array because that allows us to parse in more than 1 line at once. Here's another example, this time with more than two columns:

string[][] StringArray = new string[][] {
    new string[] {"Name:", "John", "Jones."}
    new string[] {"Date of birth:", "Monday,", "07/11/1989."}
    new string[] {"Age:", "29", "Years old."}
};

FormatWhiteSpace(StringArray, Padding: 2);

Second Output would be:

Name:           John     Jones.
Date of birth:  Monday,  07/11/1989.
Age:            29       Years old.

That's all i would like to know if you know of anything that can help me please let me know. Thanks for your help, you guys really made my day.

回答1:

I personally love using Linq, also this works with any number of columns and will calculate the distance needed for each column.

void Main()
{
    string[][] StringArray = new string[][] {
    new [] {"Name:", "John", "Jones."},
    new [] {"Date of birth:", "Monday,", "07/11/1989."},
    new [] {"Age:", "29", "Years old."}};

    var lines = FormatWhiteSpace(StringArray, Padding: 2);

    foreach (var line in lines)
    {
        Console.WriteLine(line);
    }
}

private IEnumerable<string> FormatWhiteSpace(string[][] StringArray, int Padding)
{
    var maxLengthDict = StringArray
        .Select(sa => sa.Select((s, i) => new { Column = i, MaxLength = s.Length }))        
        .SelectMany(x => x)
        .GroupBy(x => x.Column)
        .Select(x => new {Column = x.Key, MaxLength = x.Max(y => y.MaxLength)})
        .ToDictionary(x => x.Column, x => x.MaxLength);

    return StringArray
        .Select(sa => string.Concat(sa.Select((s, i) => s.PadRight(maxLengthDict[i] + Padding))));
}

回答2:

Try something like this (I added an extra row to your data to make it not square and make debugging more obvious):

public static class PaddedColumns
{
    private static string[][] _stringArray = new string[][] {
        new [] {"Name:", "John", "Jones."},
        new [] {"Date of birth:", "Monday,", "07/11/1989."},
        new [] {"Age:", "29", "Years old."},
        new [] {"Eye Color:", "blue", ""},
    };

    public static void PadIt()
    {
        OutputPadded(_stringArray);
    }

    public static void OutputPadded(string[][] strings)
    {
        var columnMaxes = new int[strings[0].Length];

        foreach (var row in strings)
        {
            for (var colNo = 0; colNo < row.Length; ++colNo)
            {
                if (row[colNo].Length > columnMaxes[colNo])
                {
                    columnMaxes[colNo] = row[colNo].Length;
                }
            }
        }

        const int extraPadding = 2;

        //got the maxes, now go through and use them to pad things
        foreach (var row in strings)
        {
            for (var colNo = 0; colNo < row.Length; ++colNo)
            {
                Console.Write(row[colNo].PadRight(columnMaxes[colNo] + extraPadding));
            }
            Console.WriteLine("");
        }

    }

}

The result looks like:

Name:           John     Jones.
Date of birth:  Monday,  07/11/1989.
Age:            29       Years old.
Eye Color:      blue

来源：https://stackoverflow.com/questions/53401292/question-is-there-a-way-to-format-white-space-like-this-in-c

标签

formatting

whitespace