How to retrieve Object from arraylist in c#

How to retrieve Object and its member from arraylist开发者_运维知识库 in c#.

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You mean like this?

ArrayList list = new ArrayList();
YourObject myObject = new YourObject();

list.Add(myObject);    

YourObject obj = (YourObject)list[0];

To loop through:

foreach(object o in list)
{
   YourObject myObject = (YourObject)o;  
  .......
}

Information on ArrayList

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    object[] anArray = arrayListObject.ToArray();
    for(int i = 0; i < anArray.Length; i++)
       Console.WriteLine(((MyType)anArray[i]).PropertyName); // cast type MyType onto object instance, then retrieve attribute

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Here's an example of a simple ArrayList being populated with a new KeyValuePair object. I then pull the object back out of the ArrayList, cast it back to its original type and access it property.

var testObject = new KeyValuePair<string, string>("test", "property");
var list = new ArrayList();
list.Add(testObject);
var fetch = (KeyValuePair<string, string>)list[0];
var endValue = fetch.Value;

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You should use generic collections for this. Use the generic ArrayList so you dont have to cast the object when you are trying to get it out of the array.

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You can also use extension methods:

ArrayList list = new ArrayList();
// If all objects in the list are of the same type
IEnumerable<MyObject> myenumerator = list.Cast<MyObject>();
// Only get objects of a certain type, ignoring others
IEnumerable<MyObject> myenumerator = list.OfType<MyObject>();

Or if you're not using a newer version of .Net, check the object type and cast using is/as

list[0] is MyObject; // returns true if it's an MyObject
list[0] as MyObject; // returns the MyObject if it's a MyObject, or null if it's something else

Edit: But if you're using a newer version of .Net...

I strongly suggest you use the Generic collections in System.Collections.Generic

var list = new List<MyObject>(); // The list is constructed to work on types of MyObject
MyObject obj = list[0];
list.Add(new AnotherObject()); // Compilation fail; AnotherObject is not MyObject

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Do a type casting like this:

yourObject = new object[]{"something",123,1.2};

((System.Collections.ArrayList)yourObject)[0];