Convert an array of integers for use in a SQL “IN” clause

Question

Surely there is a framework method that given an array of integers, strings etc converts them into a list that can be used in a SQL \"IN\" clause?

e.g.

Answer 1

You can do this more efficiently using the following extension method:

    ///
Appends a list of strings to a StringBuilder, separated by a separator string.
    ///The StringBuilder to append to.
    ///The strings to append.
    ///A string to append between the strings.
    public static StringBuilder AppendJoin(this StringBuilder builder, IEnumerable strings, string separator) {
        if (builder == null) throw new ArgumentNullException("builder");
        if (strings == null) throw new ArgumentNullException("strings");
        if (separator == null) throw new ArgumentNullException("separator");

        bool first = true;

        foreach (var str in strings) {
            if (first)
                first = false;
            else
                builder.Append(separator);

            builder.Append(str);
        }

        return builder;
    }

    ///
Combines a collection of strings into a single string.
    public static string Join(this IEnumerable strings, string separator, Func selector) { return strings.Select(selector).Join(separator); }
    ///
Combines a collection of strings into a single string.
    public static string Join(this IEnumerable strings, string separator) { return new StringBuilder().AppendJoin(strings, separator).ToString(); }