C# Json LinQ - 使用循环构建 Json 字符串答案

【问题标题】：C# Json LinQ - Build Json String Using LoopC# Json LinQ - 使用循环构建 Json 字符串
【发布时间】：2021-03-31 16:01:00
【问题描述】：

我正在尝试生成一个如下所示的 Json 字符串：

{
  "fromAddress": {
    "streetLines": [
      "100 Test St",
      "Ste 100"
    ],
    "city": "Orlando",
    "stateOrProvinceCode": "FL",
    "postalCode": "32819",
    "countryCode": "US"
  },
  "toAddress": {
    "streetLines": [
      "101 Test St",
      null
    ],
    "city": "Orlando",
    "stateOrProvinceCode": "FL",
    "postalCode": "32819",
    "countryCode": "US"
  },
  "packageDimensions": [
   {
      "weight": 20.0,
      "length": "18",
      "width": "12",
      "height": "13"
   },
   {
      "weight": 20.0,
      "length": "18",
      "width": "12",
      "height": "13"
   },
   {
      "weight": 20.0,
      "length": "18",
      "width": "12",
      "height": "13"
   }
   ]
}

我的代码已经做到了这一点：

        var json = new
            {
                fromAddress = new
                {
                    streetLines = new[]
                    {
                        fromAddress1,
                        fromAddress2
                    },
                    city = fromCity,
                    stateOrProvinceCode = fromState,
                    postalCode = fromZip,
                    countryCode = fromCountry
                },
                toAddress = new
                {
                    streetLines = new[]
                    {
                        toAddress1,
                        toAddress2
                    },
                    city = toCity,
                    stateOrProvinceCode = toState,
                    postalCode = toZip,
                    countryCode = toCountry
                },
            };

这会产生以下内容，但缺少包装尺寸：

{
  "fromAddress": {
    "streetLines": [
      "100 Test St",
      "Ste 100"
    ],
    "city": "Orlando",
    "stateOrProvinceCode": "FL",
    "postalCode": "32819",
    "countryCode": "US"
  },
  "toAddress": {
    "streetLines": [
      "101 Test St",
      null
    ],
    "city": "Orlando",
    "stateOrProvinceCode": "FL",
    "postalCode": "32819",
    "countryCode": "US"
  }
}

我的包装尺寸数据是这样存储的：

List<double> weight
string length
string width
string height

重量的多个值与列表一起传入，尺寸是常数。

我需要找到一种方法来添加包装尺寸，迭代重量列表来做到这一点。但我不确定如何处理它，在 Json 构建中添加循环无论如何都不起作用。

对于获得所需数据迭代的任何建议，我将不胜感激。谢谢。

【问题讨论】：

标签： c# json linq

【解决方案1】：

您必须添加带有投影的 LINQ 表达式：

var json = new
    {
        fromAddress = new
        {
            streetLines = new[]
            {
                fromAddress1,
                fromAddress2
            },
            city = fromCity,
            stateOrProvinceCode = fromState,
            postalCode = fromZip,
            countryCode = fromCountry
        },
        toAddress = new
        {
            streetLines = new[]
            {
                toAddress1,
                toAddress2
            },
            city = toCity,
            stateOrProvinceCode = toState,
            postalCode = toZip,
            countryCode = toCountry
        },
        packageDimensions = weight.Select(w => new 
        {
            weight = w,
            length = length,
            width = width,
            height = height
        })
        .ToArray()
    };

【讨论】：