C# 将集合拆分为多个集合
我想在单个列表的基础上创建列表的新列表。 我有一张这样的清单C# 将集合拆分为多个集合,c#,linq,lambda,C#,Linq,Lambda,我想在单个列表的基础上创建列表的新列表。 我有一张这样的清单 public class OfficeLocator { public String id{ get; set; } public string Geography{ get; set; } public string Country{ get; set; } public string State{ get; set; } public string OfficeName{ get; set;
public class OfficeLocator
{
public String id{ get; set; }
public string Geography{ get; set; }
public string Country{ get; set; }
public string State{ get; set; }
public string OfficeName{ get; set; }
}
我正在准备一个树状结构的列表
GeographyName="Asia",
{
Country = "China",
{
State = "Hunan",
{
{
OfficeId = "1",
OfficeName = "Office 1"
},
{
OfficeId = "2",
OfficeName = "Office 2"
}
},
State = "Hubei"
{
{
OfficeId = "3",
OfficeName = "Office 3"
}
}
},
Country = "India",
{
State = "Maharashtra",
{
{
OfficeId = "4",
OfficeName = "Office 4"
},
{
OfficeId = "5",
OfficeName = "Office 5"
}
},
State = "Punjab"
{
{
OfficeId = "6",
OfficeName = "Office 6"
}
}
},
},
GeographyName="Europe",
{
Country = "UK",
{
State = "York",
{
{
OfficeId = "7",
OfficeName = "Office 7"
},
{
OfficeId = "8",
OfficeName = "Office 8"
}
}
}
}
我试着在地理和国家方面使用一些分组。
但我没有得到所需的输出。我可以使用循环逻辑来获得结果,但我想避免它,并尝试使用linq。类似的东西
var allRegionGroups = allOfficeLocators
.GroupBy(ol => ol.Geography)
.Select(gGroup => new
{
GeographyName = gGroup.Key,
Countries = gGroup
.GroupBy(ol => ol.Country)
.Select(cGroup => new
{
Country = cGroup.Key,
States = cGroup
.GroupBy(ol => ol.State)
.Select(sGroup => new
{
State = sGroup.Key,
OfficeList = sGroup
.Select(ol => new { OfficeId = ol.id, ol.OfficeName })
.ToList()
})
.ToList()
})
.ToList()
})
.ToList();
如何访问匿名类型的所有属性:
foreach (var region in allRegionGroups)
{
string geographyName = region.GeographyName;
var allCountries = region.Countries;
foreach (var c in allCountries)
{
string country = c.Country;
var allStates = c.States;
// and so on...
}
}
像这样的
var allRegionGroups = allOfficeLocators
.GroupBy(ol => ol.Geography)
.Select(gGroup => new
{
GeographyName = gGroup.Key,
Countries = gGroup
.GroupBy(ol => ol.Country)
.Select(cGroup => new
{
Country = cGroup.Key,
States = cGroup
.GroupBy(ol => ol.State)
.Select(sGroup => new
{
State = sGroup.Key,
OfficeList = sGroup
.Select(ol => new { OfficeId = ol.id, ol.OfficeName })
.ToList()
})
.ToList()
})
.ToList()
})
.ToList();
如何访问匿名类型的所有属性:
foreach (var region in allRegionGroups)
{
string geographyName = region.GeographyName;
var allCountries = region.Countries;
foreach (var c in allCountries)
{
string country = c.Country;
var allStates = c.States;
// and so on...
}
}
,具有一些在这种情况下很方便的过载:
var query = locations.GroupBy(
x => x.Geography,
(a, aGroup) => new
{
A = a,
Items = aGroup.GroupBy(
x => x.Country,
(b, bGroup) => new
{
B = b,
Items = bGroup.GroupBy(
x => x.State,
(c, cGroup) => new
{
B = c,
Items = cGroup.Select(i => new {i.Id, i.OfficeName})
})
})
});
读写起来更清晰一点。如果需要,Anonimized对象可以由您自己的类替换 ,在这种情况下会有一些过载:
var query = locations.GroupBy(
x => x.Geography,
(a, aGroup) => new
{
A = a,
Items = aGroup.GroupBy(
x => x.Country,
(b, bGroup) => new
{
B = b,
Items = bGroup.GroupBy(
x => x.State,
(c, cGroup) => new
{
B = c,
Items = cGroup.Select(i => new {i.Id, i.OfficeName})
})
})
});
读写起来更清晰一点。如果需要,Anonimized对象可以由您自己的类替换 你可以达到蒂姆提到的同样的结果 但不是使用方法语法, 依赖查询语法以获得更好的可读性
var projection = from location in locations
group location by location.Geography into geographies
select new
{
Geography = geographies.Key,
Countries = from geography in geographies
group geography by geography.Country into countries
select new
{
Country = countries.Key,
States = from country in countries
group country by country.State into states
select new
{
State = states.Key,
Offices = from state in states
select new
{
Id = state.Id,
Office = state.Office,
}
}
}
};
最终结果是这样的
您可以获得与Tim提到的相同的结果 但不是使用方法语法, 依赖查询语法以获得更好的可读性
var projection = from location in locations
group location by location.Geography into geographies
select new
{
Geography = geographies.Key,
Countries = from geography in geographies
group geography by geography.Country into countries
select new
{
Country = countries.Key,
States = from country in countries
group country by country.State into states
select new
{
State = states.Key,
Offices = from state in states
select new
{
Id = state.Id,
Office = state.Office,
}
}
}
};
最终结果是这样的
当你说“列表”时,你的意思是
list
type collection of C#,还是一个简单的文本列表作为JSON?展示你的方法我的意思是list type collection of C#你可以检查并指定你的问题吗。现在,它看起来像是给我指出了正确的方向。当你说“列表”时,你是指list
type-collection of C#,还是指一个简单的文本列表作为JSON?展示你的方法我指的是list-type-collection of C#,你可以检查并指定你的问题吗。目前看来,它似乎为我指明了正确的方向。感谢您提供的解决方案,但是有没有办法将集合作为列表,这样我就可以直接从中筛选数据,而不是使用foreach循环。它是一个列表,当我试图将其转换为任何类型时,您可以直接查询它。我得到的匿名类型转换错误是type to List。例如:如果我尝试创建它的树结构,并使用类节点{string id;string name;List Nodes}之类的递归逻辑,那么您还没有显示您的类,因此我无法创建它的实例。您必须使用new ClassNane,我使用new{}创建匿名类型。是的,我这样做了,而不是使用new,我有我的类名,但对于最后一个节点,它给出了一个转换列表的例外,无法从匿名转换为解决方案,但是有没有办法将集合作为列表,这样我就可以直接从中筛选数据,而不是使用foreach循环。它是一个列表,您可以直接查询它。当我试图将它转换为任何类型时,我得到了匿名类型转换为列表的类型转换错误。例如:如果我尝试创建它的树结构,并使用类节点{string id;string name;List Nodes}之类的递归逻辑,那么您还没有显示您的类,因此我无法创建它的实例。您必须使用new ClassNane,我使用new{}创建匿名类型。是的,我这样做了,而不是new,我有我的类名,但对于最后一个节点,它给出了一个转换列表的异常,无法从匿名转换。我尝试了与我的一个类似的方法。但没有取得任何成功。你能帮我吗?嗨,我试着用类似的方法来处理我的一个问题。但没有取得任何成功。你能帮我吗。