convert properties of class to list

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Hello All,

i have this classes in my project

C#

public class A{
    public A(B b, C c) {
            this.b = b;
            this.c = c;
        }
    B b;
    C c;
}

public class B{
    public B(DataRow row) {
            if (row.Table.Columns.Contains("UserName"))
                this.UserName = row["UserName"].ToString();

            if (row.Table.Columns.Contains("Password"))
                this.Password = row["Password"].ToString();
        }
    public string UserName { get; set; }
    public string Password { get; set; }

    public object MyToObject(){
    }
}

public class C{
    public C(DataRow row) {
            if (row.Table.Columns.Contains("UserName"))
                this.UserName = row["UserName"].ToString();

            if (row.Table.Columns.Contains("Password"))
                this.Password = row["Password"].ToString();
        }
    public string UserName { get; set; }
    public string Password { get; set; }
}

then, i want to take an object as output from MyToObject function that is declared in Class A,
that the output object contains all of the properties of b and c, like this:

C#

output object = {b.UserName, b.PassWord, c.UserName, c.PassWord}

Posted 19-Jun-13 9:00am

shajarian_lover

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Ron Beyer · Answer 1 · 2013-06-19T10:01:00

Solution 1

This will give you a list of properties:

C#

PropertyInfo[] propsB = typeof(b).GetProperties(BindingFlags.Public | BindingFlags.Instance);
PropertyInfo[] propsC = typeof(c).GetProperties(BindingFlags.Public | BindingFlags.Instance);

Then to put them into a list...

C#

List<string> propNames = new List<string>();

foreach (PropertyInfo p in propsB)
{
    propNames.Add("b." + p.Name);
}

foreach (PropertyInfo p in propsC)
{
    propNames.Add("c." + p.Name);
}

And there you have it, a list called propNames with all the public instance properties of class b and class c.

[Edit]

If you want to create a dynamic object from the properties, that's something much more difficult and requires using the framework Emit functions and low level MSIL.

What is the ultimate goal here? Are you trying to create a dynamic object based on static code? Why would you want to create an object with the properties of the two other classes if the classes are well known?

Posted 19-Jun-13 10:01am

Ron Beyer

Updated 19-Jun-13 10:13am

v3

Comments

shajarian_lover 19-Jun-13 16:20pm

can you explain more about how can i create dynamic object?

Ron Beyer 19-Jun-13 16:35pm

You can try DynamicObject or if you want to generate true dynamic types: True Dynamic Types

shajarian_lover 19-Jun-13 16:41pm

how can i get the value of properties?

Ron Beyer 19-Jun-13 16:57pm

p.GetValue(<instanceofb>, null), replacing the <instanceofb> with the actual instance of the class b that you want to get the property value of. For example, c objc = new c(); then find the property you want in the list, and get its value like p.GetValue(objc, null)

Sergey Alexandrovich Kryukov 19-Jun-13 16:56pm

Correct, with one exclusion: you should not hard-code "b." and "c."; for this purpose, Type.Name of Type.FullName should be used. Hard-coding of such names strongly defeats the purpose of reflection.
(I voted 4 this time.)
—SA

Ron Beyer 19-Jun-13 16:58pm

True, just a quick and dirty example, usually I use the object instance.GetType() method, that way the object type can change and the rest of the code will still work correctly.

Sergey Alexandrovich Kryukov 19-Jun-13 18:00pm

Sure...