Format a string into columns

问题

Is there a cool way to take something like this:

Customer Name - City, State - ID
Bob Whiley - Howesville, TN - 322
Marley Winchester - Old Towne, CA - 5653

and format it to something like this:

Customer Name     - City,       State - ID
Bob Whiley        - Howesville, TN    - 322
Marley Winchester - Old Towne,  CA    - 5653

Using string format commands?

I am not too hung up on what to do if one is very long. For example this would be ok by me:

Customer Name     - City,       State - ID
Bob Whiley        - Howesville, TN    - 322
Marley Winchester - Old Towne,  CA    - 5653
Super Town person - Long Town Name, WA- 45648

To provide some context. I have a drop down box that shows info very similar to this. Right now my code to create the item in the drop down looks like this:

public partial class CustomerDataContract
{
    public string DropDownDisplay
    {
        get
        {
             return  Name + \" - \" + City + \",  \" + State + \" - \" + ID;
        }
    }
}

I am looking for a way to format this better. Any ideas?

This is what I ended up with:

HttpContext.Current.Server.HtmlDecode(
    String.Format(\"{0,-27} - {1,-15}, {2, 2} - {3,5}\", 
    Name, City, State, ID)
    .Replace(\" \", \"&nbsp;\"));

The HtmlDecode changes the to a space that can withstand the space removing formatting of the dropdown list.

回答1:

You can specify the number of columns occupied by the text as well as alignment using Console.WriteLine or using String.Format:

// Prints "--123       --"
Console.WriteLine("--{0,-10}--", 123);
// Prints "--       123--"
Console.WriteLine("--{0,10}--", 123);

The number specifies the number of columns you want to use and the sign specifies alignment (- for left alignment, + for right alignment). So, if you know the number of columns available, you could write for example something like this:

public string DropDownDisplay { 
  get { 
    return String.Format("{0,-10} - {1,-10}, {2, 10} - {3,5}"),
      Name, City, State, ID);
  } 
}

If you'd like to calculate the number of columns based on the entire list (e.g. the longest name), then you'll need to get that number in advance and pass it as a parameter to your DropDownDisplay - there is no way to do this automatically.

回答2:

In addition to Tomas's answer I just want to point out that string interpolation can be used in C# 6 or newer.

// with string format
var columnHeaders1 = string.Format($"|{0,-30}|{1,-4}|{2,-15}|{3,-30}|{4,-30}|{5,-30}|{6,-30}", "ColumnA", "ColumnB", "ColumnC", "ColumnD", "ColumnE", "ColumnF", "ColumnG");

// with string interpolation
var columnHeaders2 = $"|{"ColumnA",-30}|{"ColumnB",-4}|{"ColumnC",-15}|{"ColumnD",-30}|{"ColumnE",-30}|{"ColumnF",-30}|{"ColumnG",-30}";

来源：https://stackoverflow.com/questions/2978311/format-a-string-into-columns

标签

string

string-formatting