Mixing
What is the simplest way to partition a list based on a criteria?
0
Let's say, we have an object definition like this,
class MyObject {
int id;
string name;
}
and we have a list of MyObjects.
List<MyObject> objectList
Now, I need to partition this objectList into 2 sub-lists based on which objects have a non-null name field.
So, after the operation, I need to have 2 lists, objectsWithName where name field is non-null and objectsWithoutName where name field is null (this is the immediate criteria, but I'm looking more towards partitioning into 2 groups using a predicate).
What is the simplest way to achieve this? Can I do this in a single operation? Using LINQ is permitted.
c# list linq ienumerable
edited Nov 21 '18 at 9:21
Foo
1
asked Nov 21 '18 at 9:01
Sayan BoseSayan Bose
44429
add a comment |
0
Let's say, we have an object definition like this,
class MyObject {
int id;
string name;
}
and we have a list of MyObjects.
List<MyObject> objectList
Now, I need to partition this objectList into 2 sub-lists based on which objects have a non-null name field.
So, after the operation, I need to have 2 lists, objectsWithName where name field is non-null and objectsWithoutName where name field is null (this is the immediate criteria, but I'm looking more towards partitioning into 2 groups using a predicate).
What is the simplest way to achieve this? Can I do this in a single operation? Using LINQ is permitted.
c# list linq ienumerable
edited Nov 21 '18 at 9:21
Foo
1
asked Nov 21 '18 at 9:01
Sayan BoseSayan Bose
44429
4
for loop with if statement would be simplest, LINQ is overhead here
– brykneval
Nov 21 '18 at 9:03
1
This would help you stackoverflow.com/questions/419019/…
– Hamza Haider
Nov 21 '18 at 9:10
@brykneval - what makes you think Linq is an overhead -- have you compared the IL generated by a foreach loop with that generated by Linq? I think you'll find they are not very different.
– Chris F Carroll
Nov 21 '18 at 9:17
add a comment |
0
0
0
Let's say, we have an object definition like this,
class MyObject {
int id;
string name;
}
and we have a list of MyObjects.
List<MyObject> objectList
Now, I need to partition this objectList into 2 sub-lists based on which objects have a non-null name field.
So, after the operation, I need to have 2 lists, objectsWithName where name field is non-null and objectsWithoutName where name field is null (this is the immediate criteria, but I'm looking more towards partitioning into 2 groups using a predicate).
What is the simplest way to achieve this? Can I do this in a single operation? Using LINQ is permitted.
c# list linq ienumerable
edited Nov 21 '18 at 9:21
Foo
1
asked Nov 21 '18 at 9:01
Sayan BoseSayan Bose
44429
Let's say, we have an object definition like this,
class MyObject {
int id;
string name;
}
and we have a list of MyObjects.
List<MyObject> objectList
Now, I need to partition this objectList into 2 sub-lists based on which objects have a non-null name field.
So, after the operation, I need to have 2 lists, objectsWithName where name field is non-null and objectsWithoutName where name field is null (this is the immediate criteria, but I'm looking more towards partitioning into 2 groups using a predicate).
What is the simplest way to achieve this? Can I do this in a single operation? Using LINQ is permitted.
c# list linq ienumerable
c# list linq ienumerable
edited Nov 21 '18 at 9:21
Foo
1
asked Nov 21 '18 at 9:01
Sayan BoseSayan Bose
44429
edited Nov 21 '18 at 9:21
Foo
1
asked Nov 21 '18 at 9:01
Sayan BoseSayan Bose
44429
edited Nov 21 '18 at 9:21
Foo
1
edited Nov 21 '18 at 9:21
Foo
1
edited Nov 21 '18 at 9:21
Foo
1
1
asked Nov 21 '18 at 9:01
Sayan BoseSayan Bose
44429
asked Nov 21 '18 at 9:01
Sayan BoseSayan Bose
44429
asked Nov 21 '18 at 9:01
Sayan BoseSayan Bose
44429
44429
4
for loop with if statement would be simplest, LINQ is overhead here
– brykneval
Nov 21 '18 at 9:03
1
This would help you stackoverflow.com/questions/419019/…
– Hamza Haider
Nov 21 '18 at 9:10
@brykneval - what makes you think Linq is an overhead -- have you compared the IL generated by a foreach loop with that generated by Linq? I think you'll find they are not very different.
– Chris F Carroll
Nov 21 '18 at 9:17
add a comment |
4
for loop with if statement would be simplest, LINQ is overhead here
– brykneval
Nov 21 '18 at 9:03
1
This would help you stackoverflow.com/questions/419019/…
– Hamza Haider
Nov 21 '18 at 9:10
@brykneval - what makes you think Linq is an overhead -- have you compared the IL generated by a foreach loop with that generated by Linq? I think you'll find they are not very different.
– Chris F Carroll
Nov 21 '18 at 9:17
4
4
for loop with if statement would be simplest, LINQ is overhead here
– brykneval
Nov 21 '18 at 9:03
for loop with if statement would be simplest, LINQ is overhead here
– brykneval
Nov 21 '18 at 9:03
1
1
This would help you stackoverflow.com/questions/419019/…
– Hamza Haider
Nov 21 '18 at 9:10
This would help you stackoverflow.com/questions/419019/…
– Hamza Haider
Nov 21 '18 at 9:10
@brykneval - what makes you think Linq is an overhead -- have you compared the IL generated by a foreach loop with that generated by Linq? I think you'll find they are not very different.
– Chris F Carroll
Nov 21 '18 at 9:17
@brykneval - what makes you think Linq is an overhead -- have you compared the IL generated by a foreach loop with that generated by Linq? I think you'll find they are not very different.
– Chris F Carroll
Nov 21 '18 at 9:17
add a comment |
3 Answers
3
active
oldest
votes
2
Two LINQ statements would do:
var nameNotNull = objectList.Where(o => !string.IsNullOrEmpty(o.Name));
var nameNull = objectList.Where(o => string.IsNullOrEmpty(o.Name));
Of course, you could use GroupBy, or a more efficient foreach statement.
To show the foreach option:
List<MyObject> nameNotNull = new List<MyObject>();
List<MyObject> nameNull = new List<MyObject>();
foreach (MyObject o in objectList)
{
if (!string.IsNullOrEmpty(o.Name))
{
nameNotNull.Add(o);
}
else
{
nameNull.Add(o);
}
}
answered Nov 21 '18 at 9:06
Patrick HofmanPatrick Hofman
127k18171229
I was looking to partition the list in a single iteration - so I would go with the foreach solution.
– Sayan Bose
Nov 21 '18 at 10:12
That is perfectly fine. @SayanBose
– Patrick Hofman
Nov 21 '18 at 10:30
add a comment |
1
public class MyObject
{
public int Id { get; set; }
public string Name { get; set; }
}
public class MyObjectLists
{
private readonly List<MyObject> _objects;
public List<MyObject> NullNameObjects
{
get
{
return _objects.Where(x => x.Name == null).ToList();
}
}
public List<MyObject> NonNullNameObjects
{
get
{
return _objects.Where(x => x.Name != null).ToList();
}
}
public MyObjectLists(List<MyObject> objects)
{
_objects = objects ?? throw new ArgumentNullException(nameof(objects));
}
}
Using the code:
var list = new List<MyObject>
{
new MyObject
{
Id = 1,
Name = "John"
},
new MyObject
{
Id = 2
},
new MyObject
{
Id = 3,
Name = "Mary"
},
new MyObject
{
Id = 4
}
};
var objects = new MyObjectLists(list);
foreach (MyObject myObject in objects.NonNullNameObjects)
{
Console.WriteLine($"Object with Id {myObject.Id} has a non-null name");
}
foreach (MyObject myObject in objects.NullNameObjects)
{
Console.WriteLine($"Object with Id {myObject.Id} has a null name");
}
answered Nov 21 '18 at 9:16
Rui JarimbaRui Jarimba
7,12063158
add a comment |
0
I think you're looking for something like this example:
class MyObject
{
int id;
string name;
}
var objectList = new List<MyObject>();
objectList.Add(new MyObject { name = "item 1" });
objectList.Add(new MyObject { name = string.Empty });
objectList.Add(new MyObject { name = "item 3" });
var objectsWithName = objectList.Where(x => !string.IsNullOrEmpty(x.name));
var objectsWithoutName = objectList.Except(objectsWithName);
I've created 2 lists that the first list contains the MyObject items with the name property is NOT null, otherwise to the second's.
answered Nov 21 '18 at 9:16
FooFoo
1
Exceptis too expensive here.
– Patrick Hofman
Nov 21 '18 at 9:37
@PatrickHofman I'm sorry. Could you please explain why?
– Foo
Nov 21 '18 at 9:46
1
Because it will create a hashset to compare values, while there is absolutely no need for.
– Patrick Hofman
Nov 21 '18 at 9:50
add a comment |
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
2
Two LINQ statements would do:
var nameNotNull = objectList.Where(o => !string.IsNullOrEmpty(o.Name));
var nameNull = objectList.Where(o => string.IsNullOrEmpty(o.Name));
Of course, you could use GroupBy, or a more efficient foreach statement.
To show the foreach option:
List<MyObject> nameNotNull = new List<MyObject>();
List<MyObject> nameNull = new List<MyObject>();
foreach (MyObject o in objectList)
{
if (!string.IsNullOrEmpty(o.Name))
{
nameNotNull.Add(o);
}
else
{
nameNull.Add(o);
}
}
answered Nov 21 '18 at 9:06
Patrick HofmanPatrick Hofman
127k18171229
I was looking to partition the list in a single iteration - so I would go with the foreach solution.
– Sayan Bose
Nov 21 '18 at 10:12
That is perfectly fine. @SayanBose
– Patrick Hofman
Nov 21 '18 at 10:30
add a comment |
2
Two LINQ statements would do:
var nameNotNull = objectList.Where(o => !string.IsNullOrEmpty(o.Name));
var nameNull = objectList.Where(o => string.IsNullOrEmpty(o.Name));
Of course, you could use GroupBy, or a more efficient foreach statement.
To show the foreach option:
List<MyObject> nameNotNull = new List<MyObject>();
List<MyObject> nameNull = new List<MyObject>();
foreach (MyObject o in objectList)
{
if (!string.IsNullOrEmpty(o.Name))
{
nameNotNull.Add(o);
}
else
{
nameNull.Add(o);
}
}
answered Nov 21 '18 at 9:06
Patrick HofmanPatrick Hofman
127k18171229
I was looking to partition the list in a single iteration - so I would go with the foreach solution.
– Sayan Bose
Nov 21 '18 at 10:12
That is perfectly fine. @SayanBose
– Patrick Hofman
Nov 21 '18 at 10:30
add a comment |
2
2
2
Two LINQ statements would do:
var nameNotNull = objectList.Where(o => !string.IsNullOrEmpty(o.Name));
var nameNull = objectList.Where(o => string.IsNullOrEmpty(o.Name));
Of course, you could use GroupBy, or a more efficient foreach statement.
To show the foreach option:
List<MyObject> nameNotNull = new List<MyObject>();
List<MyObject> nameNull = new List<MyObject>();
foreach (MyObject o in objectList)
{
if (!string.IsNullOrEmpty(o.Name))
{
nameNotNull.Add(o);
}
else
{
nameNull.Add(o);
}
}
answered Nov 21 '18 at 9:06
Patrick HofmanPatrick Hofman
127k18171229
Two LINQ statements would do:
var nameNotNull = objectList.Where(o => !string.IsNullOrEmpty(o.Name));
var nameNull = objectList.Where(o => string.IsNullOrEmpty(o.Name));
Of course, you could use GroupBy, or a more efficient foreach statement.
To show the foreach option:
List<MyObject> nameNotNull = new List<MyObject>();
List<MyObject> nameNull = new List<MyObject>();
foreach (MyObject o in objectList)
{
if (!string.IsNullOrEmpty(o.Name))
{
nameNotNull.Add(o);
}
else
{
nameNull.Add(o);
}
}
answered Nov 21 '18 at 9:06
Patrick HofmanPatrick Hofman
127k18171229
answered Nov 21 '18 at 9:06
Patrick HofmanPatrick Hofman
127k18171229
answered Nov 21 '18 at 9:06
Patrick HofmanPatrick Hofman
127k18171229
answered Nov 21 '18 at 9:06
Patrick HofmanPatrick Hofman
127k18171229
127k18171229
I was looking to partition the list in a single iteration - so I would go with the foreach solution.
– Sayan Bose
Nov 21 '18 at 10:12
That is perfectly fine. @SayanBose
– Patrick Hofman
Nov 21 '18 at 10:30
add a comment |
I was looking to partition the list in a single iteration - so I would go with the foreach solution.
– Sayan Bose
Nov 21 '18 at 10:12
That is perfectly fine. @SayanBose
– Patrick Hofman
Nov 21 '18 at 10:30
I was looking to partition the list in a single iteration - so I would go with the foreach solution.
– Sayan Bose
Nov 21 '18 at 10:12
I was looking to partition the list in a single iteration - so I would go with the foreach solution.
– Sayan Bose
Nov 21 '18 at 10:12
That is perfectly fine. @SayanBose
– Patrick Hofman
Nov 21 '18 at 10:30
That is perfectly fine. @SayanBose
– Patrick Hofman
Nov 21 '18 at 10:30
add a comment |
1
public class MyObject
{
public int Id { get; set; }
public string Name { get; set; }
}
public class MyObjectLists
{
private readonly List<MyObject> _objects;
public List<MyObject> NullNameObjects
{
get
{
return _objects.Where(x => x.Name == null).ToList();
}
}
public List<MyObject> NonNullNameObjects
{
get
{
return _objects.Where(x => x.Name != null).ToList();
}
}
public MyObjectLists(List<MyObject> objects)
{
_objects = objects ?? throw new ArgumentNullException(nameof(objects));
}
}
Using the code:
var list = new List<MyObject>
{
new MyObject
{
Id = 1,
Name = "John"
},
new MyObject
{
Id = 2
},
new MyObject
{
Id = 3,
Name = "Mary"
},
new MyObject
{
Id = 4
}
};
var objects = new MyObjectLists(list);
foreach (MyObject myObject in objects.NonNullNameObjects)
{
Console.WriteLine($"Object with Id {myObject.Id} has a non-null name");
}
foreach (MyObject myObject in objects.NullNameObjects)
{
Console.WriteLine($"Object with Id {myObject.Id} has a null name");
}
answered Nov 21 '18 at 9:16
Rui JarimbaRui Jarimba
7,12063158
add a comment |
1
public class MyObject
{
public int Id { get; set; }
public string Name { get; set; }
}
public class MyObjectLists
{
private readonly List<MyObject> _objects;
public List<MyObject> NullNameObjects
{
get
{
return _objects.Where(x => x.Name == null).ToList();
}
}
public List<MyObject> NonNullNameObjects
{
get
{
return _objects.Where(x => x.Name != null).ToList();
}
}
public MyObjectLists(List<MyObject> objects)
{
_objects = objects ?? throw new ArgumentNullException(nameof(objects));
}
}
Using the code:
var list = new List<MyObject>
{
new MyObject
{
Id = 1,
Name = "John"
},
new MyObject
{
Id = 2
},
new MyObject
{
Id = 3,
Name = "Mary"
},
new MyObject
{
Id = 4
}
};
var objects = new MyObjectLists(list);
foreach (MyObject myObject in objects.NonNullNameObjects)
{
Console.WriteLine($"Object with Id {myObject.Id} has a non-null name");
}
foreach (MyObject myObject in objects.NullNameObjects)
{
Console.WriteLine($"Object with Id {myObject.Id} has a null name");
}
answered Nov 21 '18 at 9:16
Rui JarimbaRui Jarimba
7,12063158
add a comment |
1
1
1
public class MyObject
{
public int Id { get; set; }
public string Name { get; set; }
}
public class MyObjectLists
{
private readonly List<MyObject> _objects;
public List<MyObject> NullNameObjects
{
get
{
return _objects.Where(x => x.Name == null).ToList();
}
}
public List<MyObject> NonNullNameObjects
{
get
{
return _objects.Where(x => x.Name != null).ToList();
}
}
public MyObjectLists(List<MyObject> objects)
{
_objects = objects ?? throw new ArgumentNullException(nameof(objects));
}
}
Using the code:
var list = new List<MyObject>
{
new MyObject
{
Id = 1,
Name = "John"
},
new MyObject
{
Id = 2
},
new MyObject
{
Id = 3,
Name = "Mary"
},
new MyObject
{
Id = 4
}
};
var objects = new MyObjectLists(list);
foreach (MyObject myObject in objects.NonNullNameObjects)
{
Console.WriteLine($"Object with Id {myObject.Id} has a non-null name");
}
foreach (MyObject myObject in objects.NullNameObjects)
{
Console.WriteLine($"Object with Id {myObject.Id} has a null name");
}
answered Nov 21 '18 at 9:16
Rui JarimbaRui Jarimba
7,12063158
public class MyObject
{
public int Id { get; set; }
public string Name { get; set; }
}
public class MyObjectLists
{
private readonly List<MyObject> _objects;
public List<MyObject> NullNameObjects
{
get
{
return _objects.Where(x => x.Name == null).ToList();
}
}
public List<MyObject> NonNullNameObjects
{
get
{
return _objects.Where(x => x.Name != null).ToList();
}
}
public MyObjectLists(List<MyObject> objects)
{
_objects = objects ?? throw new ArgumentNullException(nameof(objects));
}
}
Using the code:
var list = new List<MyObject>
{
new MyObject
{
Id = 1,
Name = "John"
},
new MyObject
{
Id = 2
},
new MyObject
{
Id = 3,
Name = "Mary"
},
new MyObject
{
Id = 4
}
};
var objects = new MyObjectLists(list);
foreach (MyObject myObject in objects.NonNullNameObjects)
{
Console.WriteLine($"Object with Id {myObject.Id} has a non-null name");
}
foreach (MyObject myObject in objects.NullNameObjects)
{
Console.WriteLine($"Object with Id {myObject.Id} has a null name");
}
answered Nov 21 '18 at 9:16
Rui JarimbaRui Jarimba
7,12063158
answered Nov 21 '18 at 9:16
Rui JarimbaRui Jarimba
7,12063158
answered Nov 21 '18 at 9:16
Rui JarimbaRui Jarimba
7,12063158
answered Nov 21 '18 at 9:16
Rui JarimbaRui Jarimba
7,12063158
7,12063158
add a comment |
add a comment |
0
I think you're looking for something like this example:
class MyObject
{
int id;
string name;
}
var objectList = new List<MyObject>();
objectList.Add(new MyObject { name = "item 1" });
objectList.Add(new MyObject { name = string.Empty });
objectList.Add(new MyObject { name = "item 3" });
var objectsWithName = objectList.Where(x => !string.IsNullOrEmpty(x.name));
var objectsWithoutName = objectList.Except(objectsWithName);
I've created 2 lists that the first list contains the MyObject items with the name property is NOT null, otherwise to the second's.
answered Nov 21 '18 at 9:16
FooFoo
1
Exceptis too expensive here.
– Patrick Hofman
Nov 21 '18 at 9:37
@PatrickHofman I'm sorry. Could you please explain why?
– Foo
Nov 21 '18 at 9:46
1
Because it will create a hashset to compare values, while there is absolutely no need for.
– Patrick Hofman
Nov 21 '18 at 9:50
add a comment |
0
I think you're looking for something like this example:
class MyObject
{
int id;
string name;
}
var objectList = new List<MyObject>();
objectList.Add(new MyObject { name = "item 1" });
objectList.Add(new MyObject { name = string.Empty });
objectList.Add(new MyObject { name = "item 3" });
var objectsWithName = objectList.Where(x => !string.IsNullOrEmpty(x.name));
var objectsWithoutName = objectList.Except(objectsWithName);
I've created 2 lists that the first list contains the MyObject items with the name property is NOT null, otherwise to the second's.
answered Nov 21 '18 at 9:16
FooFoo
1
Exceptis too expensive here.
– Patrick Hofman
Nov 21 '18 at 9:37
@PatrickHofman I'm sorry. Could you please explain why?
– Foo
Nov 21 '18 at 9:46
1
Because it will create a hashset to compare values, while there is absolutely no need for.
– Patrick Hofman
Nov 21 '18 at 9:50
add a comment |
0
0
0
I think you're looking for something like this example:
class MyObject
{
int id;
string name;
}
var objectList = new List<MyObject>();
objectList.Add(new MyObject { name = "item 1" });
objectList.Add(new MyObject { name = string.Empty });
objectList.Add(new MyObject { name = "item 3" });
var objectsWithName = objectList.Where(x => !string.IsNullOrEmpty(x.name));
var objectsWithoutName = objectList.Except(objectsWithName);
I've created 2 lists that the first list contains the MyObject items with the name property is NOT null, otherwise to the second's.
answered Nov 21 '18 at 9:16
FooFoo
1
I think you're looking for something like this example:
class MyObject
{
int id;
string name;
}
var objectList = new List<MyObject>();
objectList.Add(new MyObject { name = "item 1" });
objectList.Add(new MyObject { name = string.Empty });
objectList.Add(new MyObject { name = "item 3" });
var objectsWithName = objectList.Where(x => !string.IsNullOrEmpty(x.name));
var objectsWithoutName = objectList.Except(objectsWithName);
I've created 2 lists that the first list contains the MyObject items with the name property is NOT null, otherwise to the second's.
answered Nov 21 '18 at 9:16
FooFoo
1
answered Nov 21 '18 at 9:16
FooFoo
1
answered Nov 21 '18 at 9:16
FooFoo
1
answered Nov 21 '18 at 9:16
FooFoo
1
1
Exceptis too expensive here.
– Patrick Hofman
Nov 21 '18 at 9:37
@PatrickHofman I'm sorry. Could you please explain why?
– Foo
Nov 21 '18 at 9:46
1
Because it will create a hashset to compare values, while there is absolutely no need for.
– Patrick Hofman
Nov 21 '18 at 9:50
add a comment |
Exceptis too expensive here.
– Patrick Hofman
Nov 21 '18 at 9:37
@PatrickHofman I'm sorry. Could you please explain why?
– Foo
Nov 21 '18 at 9:46
1
Because it will create a hashset to compare values, while there is absolutely no need for.
– Patrick Hofman
Nov 21 '18 at 9:50
Except is too expensive here.– Patrick Hofman
Nov 21 '18 at 9:37
Except is too expensive here.– Patrick Hofman
Nov 21 '18 at 9:37
@PatrickHofman I'm sorry. Could you please explain why?
– Foo
Nov 21 '18 at 9:46
@PatrickHofman I'm sorry. Could you please explain why?
– Foo
Nov 21 '18 at 9:46
1
1
Because it will create a hashset to compare values, while there is absolutely no need for.
– Patrick Hofman
Nov 21 '18 at 9:50
Because it will create a hashset to compare values, while there is absolutely no need for.
– Patrick Hofman
Nov 21 '18 at 9:50
add a comment |
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4
for loop with if statement would be simplest, LINQ is overhead here
– brykneval
Nov 21 '18 at 9:03
1
This would help you stackoverflow.com/questions/419019/…
– Hamza Haider
Nov 21 '18 at 9:10
@brykneval - what makes you think Linq is an overhead -- have you compared the IL generated by a foreach loop with that generated by Linq? I think you'll find they are not very different.
– Chris F Carroll
Nov 21 '18 at 9:17