使用LINQ生成Highchart列表数据

Question

我有文章数据列表List<Article>

class Article
{
  ....
  public string Author{get; set}
  public int ReadingNumber{get; set}
  public int LikeNumber{get; set}
  public int ForwardingNumber{get; set}
  ....
}

输入数据

List<Article> input = new List<Article>
        {
            new Article { Author = "author1", ReadingNumber = 49, LikeNumber = 55, ForwardingNumber = 21 },
            new Article { Author = "author1", ReadingNumber = 11, LikeNumber = 35, ForwardingNumber = 79 },
            new Article { Author = "author2", ReadingNumber = 25, LikeNumber = 77, ForwardingNumber = 39 },
        };

现在我不知道如何使用Linq或其他任何东西将其转换为Highchart列表数据，是这样的：

categories: ['author1','author2']

series: [{
        name: 'TotalReadingNumber',
        data: [60, 25]
    }, {
        name: 'TotalLikeNumber',
        data: [90, 77]
    }, {
        name: 'TotalForwardNumber',
        data: [100, 39]
    }]

我已经厌倦了使用 linq 和 Foreach 方法来生成数据：

var authorData=
    (from a in articleList
     group a by a.Author into g
     select new {
       Author = g.Key,
       TotalReading = g.Sum(a=>a.ReadingNumber),
       TotalLikes = g.Sum(a=>a.LikeNumber),
       .......
    }).ToList()

然后我使用ForEach方法获取我需要的每一个属性

               var totalReading = new AuthorData()
                {
                    name = "TotalReading",
                    data = new List<string>()
                };
                authorData.ForEach(a => totalRead.data.Add(a.TotalRead.ToString()));

最后我将它们组合成结果，

var result =
 {
    Authors=authorData.Select(a=>a.Author).ToList(),
    series = new List<AuthorData>{totalReading,totalLike,totalForwrad.....}
}

我认为这很复杂。如何简化此解决方案？

Answer 1

很遗憾，您没有说明您的输入是什么以及为什么它应该看起来像预期的输出。但我想这个解决方案应该建立你的预期输出。我使用反射来构建它。如果您添加或删除任何整数属性，它们将自动从您的输出字符串中添加或删除。

编辑：编辑问题后，我看到您需要计算属性的总和。这在您最初的问题中并不清楚。这是更新后的代码：

List<Article> input = new List<Article>
{
    new Article { Author = "author1", ReadingNumber = 49, LikeNumber = 55, ForwardingNumber = 74 },
    new Article { Author = "author1", ReadingNumber = 141, LikeNumber = 78, ForwardingNumber = 38 },
    new Article { Author = "author2", ReadingNumber = 106, LikeNumber = 38, ForwardingNumber = 39 },
};
        
var grouped = input.GroupBy(x => x.Author).Select(x => new
{
    Author = x.Key,
    TotalReadingNumber = x.Sum(y=>y.ReadingNumber),
    TotalLikeNumber = x.Sum(y=>y.LikeNumber),
    TotalForwardingNumber = x.Sum(y=>y.ForwardingNumber),
}).ToList();
    
StringBuilder output = new StringBuilder();
output.AppendLine("xAxis: {");
output.AppendLine("categories: [");
output.AppendLine(string.Join(",", input.Select(x => $"'{x.Author}'")));
output.AppendLine("]");
output.AppendLine("},"); 
output.Append("series: [");
bool first = true;
foreach(var property in grouped.GetType().GetGenericArguments().First().GetProperties().Where(x => x.PropertyType == typeof(int)))
{
    if(!first)
    {
        output.Append(", ");
    }
    output.AppendLine("{");
    output.AppendLine("name: 'Total" + property.Name + "',");
    output.AppendLine("data: [" + string.Join(",", grouped.Select(x => property.GetValue(x))) + "]");
    output.Append("}");
    first = false;
}
output.AppendLine("]");

如果您不想使用反射，因为您需要性能，或者因为您不想在更改 Article 类时动态更改输出，您也可以像我一样使用多个 string.Join 调用使用类别，并硬编码 TotalReadingNumber、TotalLikeNumber 等值。

在线演示：https://dotnetfiddle.net/I88ZHD