Question

I am storing object values in strings e.g.,

string[] values = new string[] { "213.4", "10", "hello", "MyValue"};

is there any way to generically initialize the appropriate object types? e.g., something like

double foo1 = AwesomeFunction(values[0]);
int foo2 = AwesomeFunction(values[1]);
string foo3 = AwesomeFunction(values[2]);
MyEnum foo4 = AwesomeFunction(values[3]);

where AwesomeFunction is the function I need. The ultimate use is to intialize properties e.g.,

MyObject obj = new MyObject();
PropertyInfo info = typeof(MyObject).GetProperty("SomeProperty");
info.SetValue(obj, AwesomeFunction("20.53"), null);

The reason I need such functionality is I am storing said values in a database, and wish to read them out via a query and then initialize the corresponding properties of an object. Is this going to be possible? The entire object is not being stored in the database, just a few fields which I’d like to read & set dynamically. I know I can do it statically, however that will get tedious, hard to maintain, and prone to mistakes with numerous different fields/properties are being read.

EDIT: Bonus points if AwesomeFunction can work with custom classes which specify a constructor that takes in a string!

EDIT2: The destination type can be know via the PropertyType, in the specific case where I want to use this type of functionality. I think Enums Would be easy to parse with this e.g.,

Type destinationType = info.PropertyType;
Enum.Parse(destinationType, "MyValue");

Answer 1

Perhaps the first thing to try is:

object value = Convert.ChangeType(text, info.PropertyType);

However, this doesn’t support extensibility via custom types; if you need that, how about:

TypeConverter tc = TypeDescriptor.GetConverter(info.PropertyType);
object value = tc.ConvertFromString(null, CultureInfo.InvariantCulture, text);
info.SetValue(obj, value, null);

Or:

info.SetValue(obj, AwesomeFunction("20.53", info.PropertyType), null);

with

public object AwesomeFunction(string text, Type type) {
    TypeConverter tc = TypeDescriptor.GetConverter(type);
    return tc.ConvertFromString(null, CultureInfo.InvariantCulture, text);
}