IEnumerable when I get a real reference on the objects?

Posted by Steve on Stack Overflow See other posts from Stack Overflow or by Steve
Published on 2010-03-31T14:04:57Z Indexed on 2010/03/31 14:13 UTC
Read the original article Hit count: 207

Filed under:

ienumerable

|

equals

|

c#

IEnumerable<T> collection;

void MyMethod(T toSearch)
{
  foreach (T t in collection)
    if (t == toSearch) {}
}

The if clause is never true.. is it because the Enumerator creates all the items instances on demand, so everytime a new Reference ?

© Stack Overflow or respective owner

Related posts about ienumerable

Grouping consecutive identical items: IEnumerable<T> to IEnumerable<IEnumerable<T>>

as seen on Stack Overflow - Search for 'Stack Overflow'
I've got an interresting problem: Given an IEnumerable<string>, is it possible to yield a sequence of IEnumerable<string> that groups identical adjacent strings in one pass? Let me explain. Considering the following IEnumerable<string> (pseudo representation): {"a","b","b","b"… >>> More
IEnumerable<IEnumerable<T>> to IEnumerable<T> using LINQ

as seen on Stack Overflow - Search for 'Stack Overflow'
How to split an IEnumerable of IEnumerables to one flat IEnumerable using LINQ (or someway else)? >>> More
IEnumerable.GetEnumerator() and IEnumerable<T>.GetEnumerator()

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, In the .net framework, there's a generic IEnumerable<T> interface which inherits from the not-generic IEnumerable, and they both have a GetEnumerator() method. The only differents between these two GetEnumerator() is the return type. Now I have a similar design, but when I compile the… >>> More
Create a Generic IEnumerable<T> given a IEnumerable and the member datatypes

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I get an IEnumerable which I know is a object array. I also know the datatype of the elements. Now I need to cast this to an IEnumerable<T, where T is a supplied type. For instance IEnumerable results = GetUsers(); IEnumerable<T> users = ConvertToTypedIEnumerable(results, typeof(User)); I… >>> More
Casting from IEnumerable<Object> to IEnumerable<string>

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi All, Recently I found a very surprising behavior in c#. I had a method which takes IEnumerable<Object> as a parameter and i was passing IEnumerable<string> but it's not possible. While in c# everything can be upcast to Object than why this is not possible? It's totally confusing for… >>> More

Related posts about equals

Equals method of System.Collections.Generic.List<T>...?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm creating a class that derives from List... public class MyList : List<MyListItem> {} I've overridden Equals of MyListItem... public override bool Equals(object obj) { MyListItem li = obj as MyListItem; return (ID == li.ID); // ID is a property of MyListItem } I would like… >>> More
C#/Java: Proper Implementation of CompareTo when Equals tests reference identity

as seen on Stack Overflow - Search for 'Stack Overflow'
I believe this question applies equally well to C# as to Java, because both require that {c,C}ompareTo be consistent with {e,E}quals: Suppose I want my equals() method to be the same as a reference check, i.e.: public bool equals(Object o) { return this == o; } In that case, how do I implement… >>> More
FindBugs controversial description

as seen on Stack Overflow - Search for 'Stack Overflow'
Am I understanding it wrong, or is the description wrong? Equals checks for noncompatible operand (EQ_CHECK_FOR_OPERAND_NOT_COMPATIBLE_WITH_THIS) This equals method is checking to see if the argument is some incompatible type (i.e., a class that is neither a supertype nor subtype… >>> More
How to determine if two generic type values are equal?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to figure out how I can successfully determine if two generic type values are equal to each other. Based on Mark Byers' answer on this question I would think I can just use value.Equals() where value is a generic type. My actual problem is in a LinkedList implementation, but the problem… >>> More
Why both hashCode() and equals() exist

as seen on Stack Overflow - Search for 'Stack Overflow'
why java Object class has two methods hashcode() and equals()? One of them looks redundant and its percolated to the bottom most derived class? >>> More