C＃字符串插值 - 转义双引号和花括号

Question

伙计们，

我正在从插值字符串构建一个JSON对象，而不是获取转义的工作原理。 我必须为API使用双引号。

这不会插入花括号之间的表达式：

@"{{
                        ""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
                        }}";

这会抛出一堆错误 - 显然，大括号没有正确转义：

$"{{
                        ""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
                        }}";

我应该如何格式化它以保留内部双引号和外括号，同时允许插入单个括号内的值？

Answer 1

您似乎错过了products和query对象的转义：

$@"{{
    ""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
}}";

Answer 2

除了@"..."和$"..." C＃支持$@"..."字符串，这是您在构建需要插值的多行字符串文字时所寻找的：

$@"{{
    ""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
}}";

Answer 3

为了防止其他人正在考虑做同样的事情，最好创建一个匿名类型并将其序列化为json有两个原因：

1. 它更具可读性和可维护性（有人需要多长时间才能更改代码，因为json结构已经改变，同时保持所有转义顺序 - 特别是如果没有单元测试？）
2. 它更可靠（如果taskName有双引号怎么办？）

下面使用json.net进行序列化。

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

var jsonString = JsonConvert.SerializeObject(jsonObj);