How to Replace String

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Hi,

If we have to statically replace string like

String.Format("this is my string {0} & {1}","First","second");
But what if I get dynamically {0},{1},..{n}

How can I do it easily replace n elements with my parameters from UI?

C#

String dynString = "This is a dynamic string {0} & {1}";
String[] replaceString = new String[] { "First", "Second" };
Console.Write(String.Format(dynString, replaceString));
Console.Read();

I wrote something like this just wondering whether this will work for n when I get this replaceString with n number of elements.

Thanks.

Posted 19-Aug-12 20:04pm

payne173

Updated 19-Aug-12 21:02pm

Manfred Rudolf Bihy

v3

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pradiprenushe 20-Aug-12 2:21am

Use Arraylist with for loop or Use IEnumerable interface with foreach.

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Prabhakaran Soundarapandian · Answer 1 · 2012-08-19T20:22:00

If your parameter is a collection of string means you can use it like this
ex:

C#

string[] names = { "Anders", "Eric", "Scott", "Duncan" };
            Console.Write("My string is ");
            foreach (string curr in names)
                Console.Write(curr + " ");

If you explain clearly about your parameter details and the output you going to show then I could try to show the result in that way..

Andreas Gieriet · Answer 2 · 2012-08-19T23:37:00

If I understand your question correctly, you get some format string and want to check if it is valid for your parameter array?

You may go and have a look at Escaping in C#: characters, strings, string formats, keywords, identifiers[^], go to the Bonus paragraph in the string.format escaping section.

A solution may be (tweak with the number of args and with the formatting to see it work...):

C#

static void Main(string[] args)
{
    string dynString = "This is a dynamic string {0} & {1}";
    var constArgs = new object[] { "First", "Second" };
    string formatted = DynFormat(dynString, constArgs);
    Console.WriteLine(formatted ?? "<wrong format>");
}
// get all string format ids in the sequence they appear in the format string
private static IEnumerable<int> GetIds(string format)
{
    string pattern = @"\{(\d+)[^\}]*\}";
    return Regex.Matches(format ?? string.Empty, pattern, RegexOptions.Compiled)
                    .Cast<Match>()
                    .Select(m => int.Parse(m.Groups[1].Value));
}
// true  = the format matches the number of args,
// false = the format does not get sufficient args
private static bool HasSufficientArgs(string dynFormat, object[] args)
{
    var ids = GetIds(dynFormat).ToArray();
    // if no ids (no formatting), then ignore args
    // if there are ids, they must have matching args (excess args are ignored)
    return (ids.Length == 0)
           || (args != null) && (args.Length > ids.Max());
}
// returns the formatted string if there are sufficent args for the given format,
// returns null otherwise
public static string DynFormat(string dynFormat, params object[] args)
{
    return HasSufficientArgs(dynFormat, args)
           ? string.Format(dynFormat, args)
           : null;
}

Cheers
Andi

How to Replace String

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