String format Error "input string was not in a correct format." [duplicate]

Question

I am getting this error with the following line of code,

int numberStored = 9;
record.VALUE = string.Format("{\"FIELDS\":[{\"ELEMENT_ID\":\"275887826\",\"VALUE\":\"{0}\"}]}", numberStored.ToString(), 0);

This works fine if i substitute out {0} and place the 9 in directly, but obviously I don't want it hard coded like this. The previous answers I can see for this problem do not seem to be helping me.

As an aside, you don't need numberStored.ToString(), you can use numberStored in String.Format. ToString is called implicitly anyway. — Tim Schmelter
– Tim Schmelter, Commented Mar 11, 2015 at 15:21
Please instead of just typing "The previous answers I can see for this problem do not seem to be helping me." into the question as "demonstration" of research add actual links to questions you've found. I.e. "I've searched for bing.com/search?q=c%23+string+format+curly which gave me stackoverflow.com/questions/3773857/…, but I don't get what 'Use double braces' mean" or something similar. — Alexei Levenkov
– Alexei Levenkov, Commented Mar 11, 2015 at 15:28

Tim Schmelter · Accepted Answer · 2015-03-11 15:22:21Z

8

You have to escape curly braces by doubling them:

int numberStored = 9;
record.VALUE = string.Format("{{\"FIELDS\":[{{\"ELEMENT_ID\":\"275887826\",\"VALUE\":\"{0}\"}}]}}", numberStored.ToString(), 0);

edited Mar 11, 2015 at 15:22

Tim Schmelter

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answered Mar 11, 2015 at 15:19

dario

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