LINQ的选择新对象 [英] Linq select to new object

问题描述

我有一个LINQ查询

var x = (from t in types select t).GroupBy(g =>g.Type)

这组按类型的对象，因此我希望能有一个新的对象包含所有组合的对象和他们的计数。事情是这样的：

which groups objects by their type, as a result I want to have single new object containing all of the grouped objects and their count. Something like this:

type1, 30    
type2, 43    
type3, 72

更清晰：分组结果应该是一个对象而不是每个项目类型的对象

to be more clear: grouping results should be in one object not an object per item type

推荐答案

阅读： 101 LINQ样品 在 LINQ - 微软MSDN分组操作符网站

var x = from t in types  group t by t.Type
         into grp    
         select new { type = grp.key, count = grp.Count() };

forsingle对象使用的StringBuilder并追加它，会做或转换这字典的形式

forsingle object make use of stringbuilder and append it that will do or convert this in form of dictionary

    // fordictionary 
  var x = (from t in types  group t by t.Type
     into grp    
     select new { type = grp.key, count = grp.Count() })
   .ToDictionary( t => t.type, t => t.count); 

   //for stringbuilder not sure for this 
  var x = from t in types  group t by t.Type
         into grp    
         select new { type = grp.key, count = grp.Count() };
  StringBuilder MyStringBuilder = new StringBuilder();

  foreach (var res in x)
  {
       //: is separator between to object
       MyStringBuilder.Append(result.Type +" , "+ result.Count + " : ");
  }
  Console.WriteLine(MyStringBuilder.ToString());   

这篇关于LINQ的选择新对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！