使用LINQ查询内部IList的属性

Question

Below method returns an IList of 'SomeClass', which has property called IList.

What I am looking for is if 'Status' property of IList is 'true', I wanted to get the values of IList. I can easily do this using foreach loop, but I am planning to use LINQ for this.

Definitions :

Method:

IList<SomeClass> SomeMethod()

public class SomeClass
{
    public SomeClass();

    public IList<SomeInnerClass> ActualData { get; set; }
    public bool Status { get; set; }
}

public class SomeInnerClass
{
    public SomeInnerClass();

    public int? ID { get; set; }
    public string Message { get; set; }
    public string Name { get; set; }
}

What I have now:

var abc = IList<SomeClass> SomeMethod();

foreach (var outer in abc)
{
    foreach (var inner in outer.ActualData)
    {

    }
}

Answer 1

If you wanted to select the SomeInnerClass objects themselves, you could use a Where() call to filter your outer collection and then a Select() or SelectMany() call to retrieve either the ActualData or SomeInnerClass objects respectively :

// Get your list
var list = SomeMethod(); 
// Pull out on the SomeInnerClasses where Status is true
var output = list.Where(l => l.Status)
                 .SelectMany(l => l.ActualData)
                 .ToList();