如何使用 lambda 表达式过滤 C# 中的列表？
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How to filter a list in C# with lambda expression?
提问by user603007
I am trying to filter a list so it results in a list with just the brisbane suburb?
我正在尝试过滤一个列表，以便生成一个仅包含布里斯班郊区的列表？
c#
C＃
Temp t1 = new Temp() { propertyaddress = "1 russel street", suburb = "brisbane" };
Temp t2 = new Temp() { propertyaddress = "12 bret street", suburb = "sydney" };
List<Temp> tlist = new List<Temp>();
tlist.Add(t1);
tlist.Add(t2);
List<Temp> tlistFiltered = new List<Temp>();
//tlistFiltered. how to filter this so the result is just the suburbs from brisbane?
public class Temp
{
public string propertyaddress { get; set; }
public string suburb { get; set; }
}
采纳答案by Despertar
Use Whereclause to filter a sequence
使用Where子句过滤序列
var tlistFiltered = tlist.Where(item => item.suburb == "brisbane")
LINQ expressions like Where return IEnumerable<T>. I usually capture the result with var but you could use ToList()to project the result to a list as well. Just depends what you need to do with the list later.
LINQ 表达式，如 Where return IEnumerable<T>。我通常使用 var 捕获结果，但您也可以使用ToList()将结果投影到列表中。只取决于您稍后需要对列表做什么。
List<Temp> tlistFiltered = tlist
.Where(item => item.suburb == "brisbane")
.ToList()
Note that with the above you don't have to allocate a new list. The Whereand ToList()methods both return a new sequence which you just need to capture with the reference.
请注意，使用上述内容，您不必分配新列表。该Where和ToList()方法均返回，你只需要捕获与参考的新序列。
