通过使用Lambda或LINQ将类实例转换或映射到另一个实例的列表? [英] Convert or map a class instance to a list of another one by using Lambda or LINQ?
问题描述
我有以下两个课程:
class MyData {
public List<string> PropertyList { get; private set;}
public string PropertyB { get; set; }
public string PropertyC { get; set; }
}
class MyData2 {
public string PropertyA { get; set;}
public string PropertyB { get; set; }
public string PropertyC { get; set; }
}
如果我有MyClass的实例,则需要将其转换为MyData2的列表.我可以通过循环MyData.PropertyList并缓存其他属性值并将其插入到MyData2列表中来做到这一点,就像这样:
If I have an instance of MyClass, I need to convert it to a list of MyData2. I could do it by looping MyData.PropertyList and caching other property values and inserting them to a list of MyData2 like this:
string propertyB = myData.PropertyB;
string propertyC = myData.PropertyC;
List<MyData2> myData2List = new List<MyData>();
foreach(string item in myData.PropertyList)
{
myData2List.Add(new myData2() { item, propertyB, propertyC });
}
不确定使用LINQ或Lambda表达式的.Net 3.5功能是否可以实现?
Not sure if this can be done with .Net 3.5 features of LINQ or Lambda expression?
推荐答案
简单易用.您要基于特定列表中的每个项目(字符串)来执行某项操作,因此应将其作为查询表达式的起点.您要为每个字符串创建一个新项目(a MyData2
),因此您要使用投影.您想在最后创建一个列表,因此您调用ToList()
完成该工作:
It's nice and easy. You want to do something based on every item (a string) in a particular list, so make that the starting point of your query expression. You want to create a new item (a MyData2
) for each of those strings, so you use a projection. You want to create a list at the end, so you call ToList()
to finish the job:
var myData2List = myData.PropertyList
.Select(x => new MyData2 {
PropertyA = x,
PropertyB = myData.PropertyB,
PropertyC = myData.PropertyC })
.ToList();
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