Escape Quote in C# for javascript consumption

Question

I have a ASP.Net web handler that returns results of a query in JSON format

public static String dt2JSON(DataTable dt)
{
    String s = \"{\\\"rows\\\":[\";
         


        

Answer 1

Here is a rework of @Bryan Legend's answer with Linq:

public static string EncodeJavaScriptString(string s)
    => string.Concat(s.Select(c => {
        switch (c)
        {
            case '\"': return "\\\"";
            case '\\': return "\\\\";
            case '\b': return "\\b";
            case '\f': return "\\f";
            case '\n': return "\\n";
            case '\r': return "\\r";
            case '\t': return "\\t";
            default: return (c < 32 || c > 127) && !char.IsLetterOrDigit(c) ? $"\\u{(int)c:X04}" : c.ToString();
        }}));

Try it Online!

changelog:

• Remove double quoting wrapping since I do it in the js
• Use expression body
• Use a cleaner switch
• Use Linq
• Add a check for Letter to allow é