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C # - How can I format the output so that the line is always 7 digits long?

string name1 = "John";
string name2 = "Alexander";

Console.WriteLine(??);

//desired output: 
John   Alexand

How can I format the lines so that they always take up 7 spaces? I know how to do it in C, but I can't seem to find a way to do it for C #.

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3 answers


Use PadRight

andSubString 



var a = "James";
Console.WriteLine(a.PadRight(7, ' ').Substring(0, 7));
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Formatting like this $"{name, 7}"

ensures that the result is at least 7

; however, longer inputs will not be clipped (i.e. "Alexander"

will not be clipped to "Alexand"

).

We have to inject the logic manually, and I suggest hiding it in the extension method:

public static class StringExtensions {
  public static string ToLength(this string source, int length) {
    if (length < 0)
      throw new ArgumentOutOfRangeException("length");
    else if (length == 0)
      return "";
    else if (string.IsNullOrEmpty(source))
      return new string(' ', length);
    else if (source.Length < length)
      return source.PadRight(length);
    else
      return source.Substring(0, length); 
  }   
}


using:

Console.WriteLine($"{name1.ToLength(7)} {name2.ToLength(7)}");
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I would use an extension method in combination with PadRight() 

public void Main() {
    string name1 = "John";
    string name2 = "Alexander";

    string FullName = name1.FixLeft(7) + name2.FixLeft(7);
    Console.WriteLine(FullName);
}

private static string FixLeft(this string TextInput, int DesiredLength) {
    if (TextInput.Length < DesiredLength) { return TextInput.PadRight(DesiredLength); }
    else { return TextInput.Substring(0,DesiredLength); }
}
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