从列表中删除项目 - C#

Question

I have rather a complex datastructure. The simple version looks like this:

public class Field
{

  List<FieldRow> fieldRow;

  //I want to write a delete that iterates and deletes given the key 
  //(Use Linq?)
  public void DeleteByKey(int key)
  {
    //Do Remove
  }
}

public class FieldRow
{
  public int key;
}

Any help in implementing Delete is appreciated.

Answer 1

public class Field
{
  List<FieldRow> fieldRow;

  public void DeleteByKey(int key)
  {
    fieldRow.RemoveAll(row => key == row.key);
  }
}

public class FieldRow
{
  public int key;
}

Answer 2

List<T>().RemoveAll() will do what you want.

You give it a Predicate delegate type, that is executed for each item, like a where clause:

fieldRow.RemoveAll(item => item.Key == key);

However, you might want to consider storing the data in a Dictionary<int, FieldRow> . That way you can access the dictionary/map directly by key. This would improve performance.

Answer 3

You could find the index of the field you need to remove and use the RemoveAt method on List.

I will add an example in a minute. Nevermind, the suggestion to use RemoveAll with a predicate seems to be a better option:-)