如何将嵌套字典展平为某些对象的列表(以下示例中为SomeObject
),这些对象应该包含这些字典的键?
例如:让我们有一个以下类型的字典
var nestedDictionary = new Dictionary<int, Dictionary<int, string>>();
然后,让我们有这个班级
public class SomeObject
{
public int var1;
public int var2;
public string someStringVar;
}
如何将nestedDictionary
转换为List<SomeObject>
,其中var1
是外部字典的关键字,var2
是内部字典的关键字someStringVar
}是内部字典的字符串值?
基本上,我该如何转移:
nestedDict[0][0] = "foo";
nestedDict[0][1] = "bar";
nestedDict[0][2] = "foo1";
nestedDict[1][0] = "bar1";
nestedDict[1][1] = "foo2";
nestedDict[1][2] = "bar2";
到此(在伪C#中只是为了可视化)
objList[0] = SomeObject { var1 = 0, var2 = 0, someStringVar = "foo" }
objList[1] = SomeObject { var1 = 0, var2 = 1, someStringVar = "bar" }
objList[2] = SomeObject { var1 = 0, var2 = 2, someStringVar = "foo1" }
objList[3] = SomeObject { var1 = 1, var2 = 0, someStringVar = "bar1" }
objList[4] = SomeObject { var1 = 1, var2 = 1, someStringVar = "foo2" }
objList[5] = SomeObject { var1 = 1, var2 = 2, someStringVar = "bar2" }
使用LINQ?
答案 0 :(得分:10)
您可以使用SelectMany()并撰写如下内容:
var objList = nestedDictionary.SelectMany(
pair => pair.Value.Select(
innerPair => new SomeObject() {
var1 = pair.Key,
var2 = innerPair.Key,
someStringVar = innerPair.Value
})).ToList();
答案 1 :(得分:9)
这应该有效:
var flattened =
from kvpOuter in nestedDictionary
from kvpInner in kvpOuter.Value
select new SomeObject()
{
var1 = kvpOuter.Key,
var2 = kvpInner.Key,
someStringVar = kvpInner.Value
};
var list = flattened.ToList(); // if you need a list...
答案 2 :(得分:1)
这将为您提供IEnumerable<SomeObject>
的可枚举:
var results = from d in nestedDictionary
from innerD in d.Value
select new SomeObject { var1 = d.Key, var2 = innerD .Key, someStringVar = innerD .Value };
致电results.ToList
或results.ToArray
,分别获得List<SomeObject>
或SomeObject[]
。
答案 3 :(得分:0)
var xxx = nestedDictionary.SelectMany(
kvp =>
kvp.Value.Select(
xx => new SomeObject() {var1 = kvp.Key, var2 = xx.Key, someStringVar = xx.Value}));