How to provide custom string placeholder for string format

Question

I have a string

string str =\"Enter {0} patient name\";

I am using string.format to format it.

String.Format(str, \"Hello\         


        

Answer 1

You can also use the example from Marc Gravell and Extend the String class object:

public static class StringExtension
{
    static readonly Regex re = new Regex(@"\{([^\}]+)\}", RegexOptions.Compiled);
    public static string FormatPlaceholder(this string str, Dictionary fields)
    {
        if (fields == null)
            return str;

        return re.Replace(str, delegate(Match match)
        {
            return fields[match.Groups[1].Value];
        });

    }
}

Example usage:

String str = "I bought a {color} car";
Dictionary fields = new Dictionary();
fields.Add("color", "blue");

str.FormatPlaceholder(fields));