How to convert child interface list to parent interface list

Question

1.00/5 (1 vote)

See more:

class AttachToObjectData : IData

I have this two list
m_attachObjectDataListToProcess = new List<attachtoobjectdata>();
createAndCheckInObjectDataList = new List<idata>();

i have one function where i want to give IData as input.

so for that i want to convert List<attachtoobjectdata> to List<idata>

for example : updateDocument(IData)

now for this call i want data should be in IData

Regars
Bhushan

What I have tried:

I tried
m_attachObjectDataListToProcess.Convert : Not working

m_attachObjectDataListToProcess

.Cast : Not working

Posted 16-Aug-17 3:26am

Member 13253943

Updated 16-Aug-17 3:44am

TheRealSteveJudge

v2

Add a Solution

Comments

Richard Deeming 17-Aug-17 10:35am

Isn't this essentially the same question you asked last week?

https://www.codeproject.com/Questions/1200615/How-can-I-cast-child-to-parent-and-parent-to-child[^]

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Graeme_Grant · Answer 1 · 2017-08-16T03:32:00

Solution 1

Change the definition of m_attachObjectDataListToProcess to:

C#

m_attachObjectDataListToProcess = new List<idata>();

Then you can add AttachToObjectData objects to m_attachObjectDataListToProcess as AttachToObjectData implements idata interface. now you can do what you are trying to do.

Posted 16-Aug-17 3:32am

Graeme_Grant

TheRealSteveJudge · Answer 2 · 2017-08-16T03:42:00

If you have an interface like this

public interface IData
{
    string Value { get; set; }
}

and a class implementing this interface

public class Data : IData
{
    public string Value { get; set; }
}

and a list of Data like this

var dataList = new List<Data>
{
    new Data {Value = "A"},
    new Data {Value = "B"}
};

you could cast to IData like this:

var iDataList = dataList.Cast<IData>();