Nullable detection kludge

[jon.rea@gmail.com]

Please tell me there is a better way :-D

....

public static bool IsNullableType( Type paramType)
{
return paramType.IsGen ericType &&
paramType.GetGe nericTypeDefini tion() == typeof
(Nullable<>);
}

public static bool IsNullableTypeM atch(Type paramType, Type
argType)
{
return IsNullableType( paramType) &&
argType.IsValue Type &&
paramType.FullN ame.Contains(ar gType.FullName) ; //
**********Kludg e***********
}

- paramType {Name = "Nullable`1 " FullName = "System.Nullabl e`1
[[System.Int32, mscorlib, Version=2.0.0.0 , Culture=neutral ,
PublicKeyToken= b77a5c561934e08 9]]"} System.Type {System.Runtime Type}

- argType {Name = "Int32" FullName = "System.Int 32"} System.Type
{System.Runtime Type}

IsNullableTypeM atch(...) -->

Nullable<Int32w ith Int32 -- returns true
Nullable<OtherV alueTypewith Int32 -- returns false
Nullable<Int32w ith OtherValueType -- returns false

Any ideas how I can remove my kludge???

Many thanks for any help,
Jon

[Hans Kesting]

Re: Nullable detection kludge

jon.rea@gmail.c om submitted this idea :

Please tell me there is a better way :-D
>
...
>
public static bool IsNullableType( Type paramType)
{
return paramType.IsGen ericType &&
paramType.GetGe nericTypeDefini tion() == typeof
(Nullable<>);
}
>
public static bool IsNullableTypeM atch(Type paramType, Type
argType)
{
return IsNullableType( paramType) &&
argType.IsValue Type &&
paramType.FullN ame.Contains(ar gType.FullName) ; //
**********Kludg e***********
}
>
- paramType {Name = "Nullable`1 " FullName = "System.Nullabl e`1
[[System.Int32, mscorlib, Version=2.0.0.0 , Culture=neutral ,
PublicKeyToken= b77a5c561934e08 9]]"} System.Type {System.Runtime Type}
>
- argType {Name = "Int32" FullName = "System.Int 32"} System.Type
{System.Runtime Type}
>
IsNullableTypeM atch(...) -->
>
Nullable<Int32w ith Int32 -- returns true
Nullable<OtherV alueTypewith Int32 -- returns false
Nullable<Int32w ith OtherValueType -- returns false
>
Any ideas how I can remove my kludge???
>
Many thanks for any help,
Jon

This should work:

public static bool IsNullableTypeM atch(Type paramType, Type argType)
{
return IsNullableType( paramType) &&
argType.IsValue Type &&
paramType.GetGe nericArguments( )[0] == argType;
}

Hans Kesting

[Ben Voigt [C++ MVP]]

Re: Nullable detection kludge

Hans Kesting wrote:

jon.rea@gmail.c om submitted this idea :

>Please tell me there is a better way :-D
>>
>...
>>
> public static bool IsNullableType( Type paramType)
> {
> return paramType.IsGen ericType &&
> paramType.GetGe nericTypeDefini tion() == typeof
>(Nullable<>) ;
> }
>>
> public static bool IsNullableTypeM atch(Type paramType, Type
>argType)
> {
> return IsNullableType( paramType) &&
> argType.IsValue Type &&
> paramType.FullN ame.Contains(ar gType.FullName) ; //
>**********Klud ge***********
> }
>>
>- paramType {Name = "Nullable`1 " FullName = "System.Nullabl e`1
>[[System.Int32, mscorlib, Version=2.0.0.0 , Culture=neutral ,
>PublicKeyToken =b77a5c561934e0 89]]"} System.Type {System.Runtime Type}
>>
>- argType {Name = "Int32" FullName = "System.Int 32"} System.Type
>{System.Runtim eType}
>>
>IsNullableType Match(...) -->
>>
>Nullable<Int32 with Int32 -- returns true
>Nullable<Other ValueTypewith Int32 -- returns false
>Nullable<Int32 with OtherValueType -- returns false
>>
>Any ideas how I can remove my kludge???
>>
>Many thanks for any help,
>Jon

>
>
This should work:
>
public static bool IsNullableTypeM atch(Type paramType, Type argType)
{
return IsNullableType( paramType) &&
argType.IsValue Type &&

the IsValueType check here is unnecessary

paramType.GetGe nericArguments( )[0] == argType;
}
>
Hans Kesting