更新时间:2023-02-13 22:22:31
您需要使用 Distinct
的第二个重载,它采用 IEqualityComparer
实例作为第二个参数.像这样定义一个比较器:
You need to use the second overload of Distinct
that takes an IEqualityComparer<TimeMetric>
instance as a second parameter. Define a comparer like this:
class MyComparer : IEqualityComparer<TimeMetric>
{
public bool Equals(TimeMetric x, TimeMetric y)
{
return x.MetricText.Equals(y.MetricText);
}
public int GetHashCode(TimeMetric obj)
{
return obj.MetricText.GetHashCode();
}
}
重要提示:上面的代码没有检查 MetricText
属性为 null
的情况(听起来可能是, 因为它很可能是一个 string
).如果 MetricText
为 null
,您应该这样做并从 GetHashCode
返回 0
.另一方面,如果MetricText
的类型是值类型,则不需要进行任何修改.
Important note: The above code does not check for the case where the MetricText
property is null
(and it sounds like it could be, since it's most probably a string
). You should do that and return 0
from GetHashCode
if MetricText
is null
. On the other hand, if the type of MetricText
is a value type, you don't need to perform any modification.
然后:
var list = new List<TimeMetric> { ... };
var unique = list.Distinct(new MyComparer());