Re: Dynamic type creation questions (more info)
- From: "~~~ .NET Ed ~~~" <tiredofspam@xxxxxxxxxxxxxxx>
- Date: Wed, 6 Apr 2005 14:14:45 +0200
The saga continues.... Question #2 is still 100% open. As for question #1 I
found a way but am still halfways:
1. I can use the method below to get a System.Type based on the string name
of the type (itemType). Then I used
some obscure things from System.Reflection to get access to the type's
Parse method if it exists. Since I am
dealing with numeric & boolean & string types this handling is ok, if
parse is found it can be used, but I haven't
gotten there yet, because....
1a) I obtained my type (System.Type) as itemNativeType below. This can be
almost any of the types mentioned
above (int, byte, long, etc.). The question that I have now is, HOW,
based on itemNativeType (ie. it may be
ANY of those types) can I create an instance of that type. For example,
to create an instance of a long, or
boolean or string?
The problem i see here is that some of those types (int for example)
are value types so I cannot get a handle
to the type's constructor or initializer. Any ideas?
"~~~ .NET Ed ~~~" <tiredofspam@xxxxxxxxxxxxxxx> wrote in message
news:e%23IhdgoOFHA.3704@xxxxxxxxxxxxxxxxxxxxxxx
> Hi, I am confronted with a problem that is probably related to a part of
> the .NET framework I am not familiar with, so here are the two "problems".
>
> 1. I have a value in string form, and a string indicating the actual
> system type of the value:
> string itemValue = "2500.6";
> string itemType = "System.Decimal"
>
> Having that information I want to dynamically be able to recreate the
> item in its original type (ie. decimal item = 2500.6M").
>
> I know I can obtain the type using the following:
> System.Type itemNativeType = System.Type.GetType(itemType);
>
> But then at this point I do not know how I could do something that would
> be equivalent to decimal.Parse(itemValue) but then in a way that it can be
> done in a generic way (for numeric types at least) using the
> itemNativeType variable shown above. Basically I want to avoid having a
> large switch statement (or if chain) for each of the supported data types,
> ie this is not what I want:
>
> if (itemType.Equals("System.Decimal"))
> decimal d = decimal.Parse(itemValue);
> if .....
>
>
> 2. Then the 2nd problem that occupies my mind is how to dynamically create
> a new type. Say I want to dynamically create a structure whose type I
> would name SAnyType and to which I could dynamically ADD members of any of
> the basic .net types (int, string, float, decimal, etc.). So the structure
> may contain two members (int, float) in one instance and then under other
> circumstances just one (of any type) or more of any combination thereof.
> Is that possible? I have been trying to find any sample on the internet
> without any luck.
>
> Thx,
> Emil
>
.
- References:
- Dynamic type creation questions
- From: ~~~ .NET Ed ~~~
- Dynamic type creation questions
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