C＃字符串插值 - 轉義雙引號和花括號

Question

伙計們，

我正在從插值字符串構建一個JSON對象，而不是獲取轉義的工作原理。 我必須為API使用雙引號。

這不會插入花括號之間的表達式：

@"{{
                        ""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
                        }}";

這會拋出一堆錯誤 - 顯然，大括號沒有正確轉義：

$"{{
                        ""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
                        }}";

我應該如何格式化它以保留內部雙引號和外括號，同時允許插入單個括號內的值？

Answer 1

您似乎錯過了products和query對象的轉義：

$@"{{
    ""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，這是您在構建需要插值的多行字符串文字時所尋找的：

$@"{{
    ""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

為了防止其他人正在考慮做同樣的事情，最好創建一個匿名類型並將其序列化為json有兩個原因：

1. 它更具可讀性和可維護性（有人需要多長時間才能更改代碼，因為json結構已經改變，同時保持所有轉義順序 - 特別是如果沒有單元測試？）
2. 它更可靠（如果taskName有雙引號怎么辦？）

下面使用json.net進行序列化。

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);