System.FormatException of a string [duplicate]

Question

I'm getting System.FormatException: Input string was not in a correct format when running this method.

The values of the fields:

arrayName = "requester";
fieldList = "\"name\" : \"shimshon\""; // "name" : "shimshon"


public override string ToString()
{
   var val = string.Format("\"{0}\" : { {1} }", arrayName, fieldList);

   return val;
}

the expect result of the method is

"requester" : { "name" : "shimshon" }

What is wrong with this format?

Answer 1

I think you want:

var val = string.Format("\"{0}\" : {{ {1} }}", arrayName, fieldList);

Note the doubled {{ and }} which is the escape sequence necessary to get braces literally into the output.

Answer 2

Try

var val = string.Format("\"{0}\" : {{ {1} }}", arrayName, fieldList);