Set Class object using List?

Question

I have a class with n data members as follows :

public class Input
{
    int mode1  {get; set;}
    int geom2  {get; set;}
    int type3  {get; set;}
    int spacing4 {get; set;}
    int fluid5 {get; set;}
    int spec6 {get; set;}
    ...
    ...
    ...
    int data_n {get; set;}
}

and I have a filled list of n int items.

List<int> dataList = new List<int>

Now I want to fill an object of class Input from dataList through iteration or through any other direct method will be helpful. Thank you

Do you mean var input = new Input { mode1 = dataList[i + 0], geom2 = dataList[i + 1], ..., where i starting at 0 is the input index in the data list, enabling you to handle multiple in a loop? What have you tried? — CodeCaster
– CodeCaster, Commented Jul 9, 2014 at 8:49
Are the integers in your list in the same order as the fields in your Input class? — Alexandre D.
– Alexandre D., Commented Jul 9, 2014 at 8:50
@CodeCaster, my real class comprises 98 data members so I cant use this. — Rahul
– Rahul, Commented Jul 9, 2014 at 8:51

Selman Genç · Accepted Answer · 2014-07-09 09:08:26Z

3

Reflection can be useful here but you should definitely re-consider your design if you have 98 properties in one class.

var properties = typeof(Input)
                .GetProperties()
                .Where(p => p.PropertyType == typeof(int));

int i = 0;
foreach(var prop in properties)
    prop.SetValue(yourObject, dataList[i++]);

But this doesn't guarantee that each property will be assigned correctly because as already mentioned by @CodeCaster GetProperty method doesn't return the properties in particular order.And there is no way to determine the order and map values to the properties when you have List<int>, if you can use Dictionary<string, int> instead, where key is the property name, then you can set each property to the corresponding value.

edited Jul 9, 2014 at 9:08

answered Jul 9, 2014 at 8:53

Selman Genç

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2 Comments

CodeCaster Over a year ago

-1 for the assumptions this does. The GetProperties method does not return properties in a particular order, such as alphabetical or declaration order. Your code must not depend on the order in which properties are returned, because that order varies. (@Christos please define "elegant way"?).

Christos Over a year ago

@CodeCaster I didn't know that GetProperties method does not return properties in a particular order. As for the elegant way, I was meant the use of reflection which give us all the properties of the class called input and then the assign to each of these propertied the corresponding value, without having to use the name of the property.

Christos · Accepted Answer · 2014-07-09 08:50:53Z

1

You could try something like this (object initializer):

Input input = new Input { mode1 = dataList[0], 
                          geom2 = dataList[1],  
                          type3 = dataList[2],
                          spacing4 = dataList[3],
                          fluid5 = dataList[4],
                          spec6 = dataList[5] };

answered Jul 9, 2014 at 8:50

Christos

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3 Comments

user1017882 Over a year ago

Don't you need parenthesis to instantiate a new Input object? EDIT: I'm assuming you don't as R.T's answer has suggested the same.

Christos Over a year ago

@DeeMac no we don't need parenthesis. Please have a look here msdn.microsoft.com/en-us/library/bb384062.aspx. Thanks

Christos Over a year ago

@DeeMac no problem at all dude. This wasn't certainly a stupid comment.

Nikhil Agrawal · Accepted Answer · 2014-07-09 08:51:03Z

0

You can do this from reflection using GetProperties method as others said but why not use a simple way to do this?

Input i = new Input();

i.mode1 = dataList[0];
i.geom2 = dataList[1];
i.type3 = dataList[2];
i.spacing4 = dataList[3];
i.fluid5 = dataList[4];
i.spec6 = dataList[5];

answered Jul 9, 2014 at 8:51

Nikhil Agrawal

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Comments

Alexandre D. · Accepted Answer · 2014-07-09 09:09:39Z

0

You can try something like this using the reflection :

var properties = typeof(Input).GetProperties();

for(int i = 0; i < properties.Count(); ++i)
{
    properties[i].SetValue(dataList[i]);
}

answered Jul 9, 2014 at 9:09

Alexandre D.

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Comments

user2413912 · Accepted Answer · 2014-07-09 09:24:30Z

0

I'm not sure how you use your properties but you could alternatively have a list in your class and then set the whole list or add to that. Then you could use an enum to keep track of the values.

Something like this:

public class Input
{
    public enum MyValues
    {
        mode1 = 1,
        geom2 = 2,
        ...
    }
    public List<int> Data { get; set; }
}

answered Jul 9, 2014 at 9:24

user2413912

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Charlie · Accepted Answer · 2014-07-09 09:11:50Z

  class Layout
   {
int mode1 { get; set; }
int geom2 { get; set; }
int type3 { get; set; }
int spacing4 { get; set; }
int fluid5 { get; set; }
int spec6 { get; set; }

public int this[int number]
{

    get
    {
        if (number == 1)
            return mode1;
        else if (number == 2)
            return geom2;
        else if (number == 3)
            return type3;
        else if (number == 4)
            return spacing4;
        else if (number == 5)
            return fluid5;
        else if (number == 6)
            return spec6;
        else
            return -1;
    }
    set
    {
        if (number == 1)
            mode1 = value;
        else if (number == 2)
            geom2 = value;
        else if (number == 3)
            type3 = value;
        else if (number == 4)
            spacing4 = value;
        else if (number == 5)
            fluid5 = value;
        else if (number == 6)
            spec6 = value;
    }
}

iteration code

 Layout layout = new Layout();
foreach(int i in dataList)
 {
   layout[i]=dataList[i];
 }

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