Error when formatting JSON string

Question

JSON data is

"participant": {"id": "1"},

I tried the following code.But I got a exception

String.Format(("\n\"{0}\":{\"{1}\":\"{2}\"}","participant","id","1"));

Exception is

An unhandled exception of type 'System.FormatException' occurred in mscorlib.dll

Additional information: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.

What are you trying to do? Calling string.Format with no placeholders is pointless. — RobH
– RobH, Commented Oct 23, 2014 at 8:21

atom.gregg · Accepted Answer · 2014-10-23 08:32:34Z

5

When you have curly braces in a string.Format call, you need to escape them using double curly braces.

For example:

var str = string.Format("\"{0}\": {{ \"id\": \"{1}\" }}", "participant", 5);

In string.Format, you use placeholders which are numerically ordered from 0 (zero) to whatever you need. These are placed in single curly braces, hence the need to escape your json curly braces.

Another option would be to use one of the many Json libraries to do the serialization for you, for example Json.NET (http://james.newtonking.com/json)

eg.

var anon = new { participant = "bob", id = 5 };
var json = JsonConvert.SerializeObject(anon);

edited Oct 23, 2014 at 8:32

answered Oct 23, 2014 at 8:26

atom.gregg

1,0079 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Error when formatting JSON string

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related