Using escaped string with String.Format results in Format Exception

Question

I get a System.Format exception when trying this:

var jsonString = String.Format( @"{
    ""searchOptions"": {
        ""departurePosition"": { ""id"": {0} },
        ""arrivalPosition"": { ""id"": 376422 },
        ""travelModes"": [ ""Flight"", ""Train"", ""Bus"" ],
        ""departureDate"": ""2017-01-15"",
        ""passengers"": [
          {
            ""age"": 12,
            ""discountCards"": [ ]
          }
        ],
        ""userInfo"": {
          ""identifier"": ""0.jhvlf8amtgk"",
          ""domain"": "".com"",
          ""locale"": ""en"",
          ""currency"": ""EUR""
        },
        ""abTestParameters"": [ ]
    }
}", departurePosition);

I need this when sending a post request to a server.

How can I solve this problem ?

Create a class which will represent the data and use var json = Newtonsoft.Json.JsonConvert.SerializeObject(yourDataInstance) to create a json string. — Fabio
– Fabio, Commented Jan 15, 2017 at 8:01
As @Fabio suggested, the best option to create a maintainable solution for your Json output would be to create classes an use a library like Newtonsoft to create a valid output. As an example, I created a small demo here — Icepickle
– Icepickle, Commented Jan 15, 2017 at 8:48

Ofir Winegarten · Accepted Answer · 2017-01-15 08:02:48Z

2

It's probably because the use of { and } To Escape the { and } use {{ and }}

answered Jan 15, 2017 at 8:02

Ofir Winegarten

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Community · Accepted Answer · 2017-05-23 12:16:30Z

0

OfirW already shared this, string.Format() giving “Input string is not in correct format”

If this is just one variable, regular string concatenation will work fine.

var jsonString =  
@"{ ""searchOptions"": {
        ""departurePosition"": { ""id"": " + departurePosition + @"},
        ""arrivalPosition"": { ""id"": 376422 },
        ""travelModes"": [ ""Flight"", ""Train"", ""Bus"" ],
        ""departureDate"": ""2017-01-15"",
        ""passengers"": [
          {
            ""age"": 12,
            ""discountCards"": [ ]
          }
        ],
        ""userInfo"": {
          ""identifier"": ""0.jhvlf8amtgk"",
          ""domain"": "".com"",
          ""locale"": ""en"",
          ""currency"": ""EUR""
        },
        ""abTestParameters"": [ ]
  }
}";

edited May 23, 2017 at 12:16

CommunityBot

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answered Jan 15, 2017 at 8:13

Ankit

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