[VB.Net] Typecasting generic parameters.

Posted by CFP on Stack Overflow See other posts from Stack Overflow or by CFP
Published on 2010-05-23T12:56:48Z Indexed on 2010/05/23 13:00 UTC
Read the original article Hit count: 208

Filed under:

vb.net

|

generics

|

typecasting

Hello world!

Using the following code:

Function GetSetting(Of T)(ByVal SettingName As String, ByRef DefaultVal As T) As T
    Return If(Configuration.ContainsKey(SettingName), CType(Configuration(SettingName), T), DefaultVal)
End Function

Yields the following error:

Value of type 'String' cannot be converted to 'T'.

Any way I could specify that in all cases, the conversion will indeed be possible (I'm basically getting integers, booleans, doubles and strings).

Thanks!

© Stack Overflow or respective owner

Related posts about vb.net

VB.NET How Do I skin a vb.net app

as seen on Stack Overflow - Search for 'Stack Overflow'
I want to skin a vb.net app I made ive googled some stuff and I've seen skinned vb.net apps. However it seems like any time i try to find someone explaining it its a link to a pay for product. Does anyone have anything useful on this? >>> More
VB.NET IF() Coalesce and “Expression Expected” Error

as seen on ASP.net Weblogs - Search for 'ASP.net Weblogs'
I am trying to use the equivalent of the C# “??” operator in some VB.NET code that I am working in. This StackOverflow article for “Is there a VB.NET equivalent for C#'s ?? operator?” explains the VB.NET IF() statement syntax which is exactly what I am looking for... and I thought I was going to… >>> More
Would a programmer knowing C# and VB.Net ever choose VB.Net?

as seen on Programmers - Search for 'Programmers'
Now before someone tells me VB.Net isn't bad like VB was, I know it isn't. But, I've yet to speak to a programmer who is completely content that some project they work on is written in VB.Net. Basically, my question is would a programmer knowing both C# and VB.Net (and all of their team knowing both)… >>> More
Do I lose anything by coding in c# and using free online vb.net code convertors?

as seen on Programmers - Search for 'Programmers'
The company I work for uses vb.net since there are many programmers who moved up from vb6 to vb.net. Basically more vb.net resources in the company for support/maintenance vs c#. I am a c# coder and was wondering if I could just continue coding in c# and just use the many online free c# to vb.net… >>> More
What are some good/reputable/widely-used libraries written in VB.NET?

as seen on Stack Overflow - Search for 'Stack Overflow'
Generally speaking, when VB.NET and C# are compared, there is a lot of strong support for C#, accompanied by some bashing of VB.NET until a respected developer comes along and acts as The Voice Of Reason, pointing out that while VB prior to VB.NET had its fair share of issues, VB.NET is really a very… >>> More

Related posts about generics

Java generics: What is the compiler's issue here?

as seen on Stack Overflow - Search for 'Stack Overflow'
I have the following methods: public <T> T fromJson( Reader jsonData, Class<T> clazz ) { return fromJson( jsonData, (Type)clazz ); } public <T> T fromJson( Reader jsonData, Type clazz ) { ... } The compiler is saying about the first method: type parameters of <T>T… >>> More
Why does NUnit ignore datapoints when using generics in a theory

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to make use of the TheoryAttribute, introduced in NUnit 2.5. Everything works fine as long as the arguments are of a defined type: [Datapoint] public double[,] Array2X2 = new double[,] { { 1, 0 }, { 0, 1 } }; [Theory] public void TestForArbitraryArray(double[,] array) { // ... } It… >>> More
Instantiating generics type in java

as seen on Stack Overflow - Search for 'Stack Overflow'
I would like to create an object of Generics Type in java. Please suggest how can I achieve the same. suppose I have the class declaration as: public class Abc<T> { public static void main(String[] args) { // I want to create an instance of T } } >>> More
.NET converting simple arrays to List Generics

as seen on Stack Overflow - Search for 'Stack Overflow'
This question might seem trivial and also stupid at the first glance, but it is much more than this. I have an array of any type T (T[]) and I want to convert it into a List generic (List<T>). Is there any other way apart from creating a Generic list, traversing the whole array and adding the… >>> More
Instantiating a list of parameterized types, making beter use of Generics and Linq

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm hashing a file with one or more hash algorithms. When I tried to parametrize which hash types I want, it got a lot messier than I was hoping. I think I'm missing a chance to make better use of generics or LINQ. I also don't like that I have to use a Type[] as the parameter instead of limiting… >>> More