C#. Loop through all struct members

Question

0.00/5 (No votes)

See more:

Hello Everyone,

I just bumped to an issue and I hope it's an easy one :)

I have a structure that contains various data types:

C#

string, Nullable<datetime>, Nullable<double> and Nullable<int64>

Totally there are 102 variables.
What I need is to do a for or foreach look in that structure and check the values.

The thing I am trying to avoid here is to reference each var separatelly like this:

C#

MyStruct str = new MyStruct();
str.var0 = "xxxx";
str.var1 = "xxxx";
...
...
str.var101 = "xxxx";

I would appreciate if you guys could at least show me the way. Don't need the detailed example as I would prefer to learn myself :)

C#

UPDATE OF THE QUESTION

The reason I am doing this is the following:
I have a DB and I need to take the tada from the DB and store it in the application. Each structure represents a single line of data from the DB (I am using

C#

OleDBDataReader

for that). Then - I am putting everything into

C#

List<MyStruct>

which I need for LINQ queries.
The final result would be another List<mystruct_2>

Thanks!

Posted 9-Sep-13 22:30pm

MK-Gii

Updated 9-Sep-13 22:41pm

v3

Add a Solution

3 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)

OriginalGriff · Accepted Answer · 2013-09-09T22:36:00

That's pretty nasty. You can do it, but it's not a good idea as a general rule unless the actual makeup of the structure is unavailable to you are design time, but the instance is at run time.
You need to play with Reflection to do this:

C#

FieldInfo[] fi = typeof(MyStruct).GetFields(BindingFlags.Public | BindingFlags.Instance);
foreach (FieldInfo info in fi)
{
    Console.WriteLine(info.Name);
}

That will give you the names of the fields within the structure, and you can use those (again with Reflection) to give you the values of the actual instance. But it really isn't a good idea unless you really, really have to - as a solution to save you typing it's a sledgehammer to crack a nut! :laugh:

**Joezer BH** · Accepted Answer · 2013-09-09T22:39:00

Solution 3

You can use Reflection!

C#

using System.Reflection;
//...
//...
//...


public void Foo (ref object structObject)
{
  FieldInfo[] members = structObject.GetType().GetFields();

  object tempValueToAssign = "A test string";

  foreach (FieldInfo fi in members)
  {
     // perform update of FieldInfo fi
     fi.SetValue(structObject, tempValueToAssign); 
  }
}

Cheers,
Edo

Posted 9-Sep-13 22:39pm

Joezer BH

v2

Comments

Herbisaurus 10-Sep-13 4:40am

*****

MK-Gii 10-Sep-13 4:43am

Thanks!

Joezer BH 10-Sep-13 4:45am

Maloniai kviečiame!

MK-Gii 10-Sep-13 4:48am

You should say: "Maloniai prasom" xDD
"Maloniai kvieciame" means "You are pleasantly invited" :D

Joezer BH 10-Sep-13 4:53am

Tnx for the correction,
it's not easy when you are not native :)

MK-Gii 10-Sep-13 4:59am

Well - Lithuanian language is real splinter in a but. Even Translate.Google.com has issue with it XD
Though it indeed translates separate words correctly (almost xD)

CPallini · Accepted Answer · 2013-09-09T22:35:00

Solution 1

You may use reflection. See, for instance, this Stack Overflow question: "Iterating through Struct members"[^].

Posted 9-Sep-13 22:35pm

CPallini