C# string interpolation-escaping double quotes and curly braces

c# string-interpolation
Boris K picture Boris K · Apr 26, 2017 · Viewed 21.8k times · Source

guys,

I'm building a JSON object from an interpolated string, and not getting how escaping works. I have to use double quotes for the API.

This does not interpolate the expressions between the curly braces:

@"{{
                        ""name"":""{taskName}"", 
                        ""products"": [    
                                    {""product"": ""ndvi_image"", ""actions"": [""mapbox"", ""processed""]}, 
                                    {""product"": ""true_color"", ""actions"": [""mapbox"", ""processed""]}
                                  ], 
                        ""recurring"":true,
                        ""query"":    {
                                        ""date_from"": ""{dateFromString}"",
                                        ""date_to"": ""{dateToString}"",
                                        ""aoi"": {polygon}
                                    },
                        ""aoi_coverage_percentage"":90
                        }}";

This throws a bunch of errors-apparently, the curly brackets are not being escaped properly:

$"{{
                        ""name"":""{taskName}"", 
                        ""products"": [    
                                    {""product"": ""ndvi_image"", ""actions"": [""mapbox"", ""processed""]}, 
                                    {""product"": ""true_color"", ""actions"": [""mapbox"", ""processed""]}
                                  ], 
                        ""recurring"":true,
                        ""query"":    {
                                        ""date_from"": ""{dateFromString}"",
                                        ""date_to"": ""{dateToString}"",
                                        ""aoi"": {polygon}
                                    },
                        ""aoi_coverage_percentage"":90
                        }}";

How should I format it in order to preserve the internal double quotes and outer brackets while allowing for the values inside the single brackets to be interpolated?

Answer

Uladzimir Palekh picture Uladzimir Palekh · Apr 26, 2017

It seems that you have missed escape for the products and query objects:

$@"{{
    ""name"":""{taskName}"",
    ""products"": [
        {{""product"": ""ndvi_image"", ""actions"": [""mapbox"", ""processed""]}},
        {{""product"": ""true_color"", ""actions"": [""mapbox"", ""processed""]}}
    ],
    ""recurring"":true,
    ""query"": {{
        ""date_from"": ""{dateFromString}"",
        ""date_to"": ""{dateToString}"",
        ""aoi"": {polygon}
    }},
    ""aoi_coverage_percentage"":90
}}";

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