how to add { in String Format c# [duplicate]

Answer 1

string t = "1, 2, 3";
string v = String.Format(" foo {{{0}}}", t); 

See duplicate post here How to escape braces (curly brackets) in a format string in .NET

using {{ and }} with result in { and } in String.Format.

Answer 2

Alternatively, using the @ operator ensures that the string is represented exactly as it appears in code:

foreach (KeyValuePair<int, string> p in Helper.Dict)
{
       // file.WriteLine(string.Format("{0} | {1}",p.Key,p.Value));
       file.WriteLine(@"{" + string.Format("Enum.{0},\"{1}\"", p.Value,p.Value) + @"}");
}

Answer 3

From this MSDN FAQ:

string s = String.Format("{{ hello to all }}");
Console.WriteLine(s);    //prints '{ hello to all }'