about the Type type

[Tony Johansson]

Hello!

If I have string name = "Mytest";
and
Type test1 = Type.GetType(na me);
and
Type test2 = name.GetType();
then the first one will assign null to test1
but the second test2 will be given the correct type which is System.String

Now to my question why will test1 be assign null I would assume that
System.String would be assigned
because name is of that type

//Tony

[Jeroen Mostert]

Re: about the Type type

Tony Johansson wrote:

If I have string name = "Mytest";
and
Type test1 = Type.GetType(na me);
and
Type test2 = name.GetType();
then the first one will assign null to test1
but the second test2 will be given the correct type which is System.String
>
Now to my question why will test1 be assign null I would assume that
System.String would be assigned
because name is of that type
>

"Mytest" is not the name of a type, so Type.GetType() fails.

http://msdn.microsoft.com/library/w3f99sx1

--
J.

[=?ISO-8859-1?Q?Arne_Vajh=F8j?=]

Re: about the Type type

Tony Johansson wrote:

If I have string name = "Mytest";
and
Type test1 = Type.GetType(na me);
and
Type test2 = name.GetType();
then the first one will assign null to test1
but the second test2 will be given the correct type which is System.String
>
Now to my question why will test1 be assign null I would assume that
System.String would be assigned
because name is of that type

http://msdn.microsoft.com/en-us/library/w3f99sx1.aspx

Parameters

typeName
Type: System..::.Stri ng
The assembly-qualified name of the type to get. See
AssemblyQualifi edName. If the type is in the currently executing
assembly or in Mscorlib.dll, it is sufficient to supply the type name
qualified by its namespace.

Arne

[Jeff Johnson]

Re: about the Type type

"Tony Johansson" <johansson.ande rsson@telia.com wrote in message
news:klGUk.4215 $U5.29009@newsb .telia.net...

Hello!
>
If I have string name = "Mytest";
and
Type test1 = Type.GetType(na me);
and
Type test2 = name.GetType();
then the first one will assign null to test1
but the second test2 will be given the correct type which is System.String
>
Now to my question why will test1 be assign null I would assume that
System.String would be assigned
because name is of that type

It doesn't matter what name's type is; it matters what its CONTENTS are.
You're calling the overload of GetType() that accepts a string, and
therefore what the function wants out of that string is, from MSDN:

------
The assembly-qualified name of the type to get. See AssemblyQualifi edName.
If the type is in the currently executing assembly or in Mscorlib.dll, it is
sufficient to supply the type name qualified by its namespace.
------

You have not supplied enough information. Try puting the namespace on the
front of the type.

[Nicholas Paldino [.NET/C# MVP]]

Re: about the Type type

Tony,

Have you looked at the documentation of the overload of GetType which
takes a string? The string that you pass is the name of the class that you
want to get the type for, not the object that you want to get the type for
(for that, you just call GetType on the instance of the object).


--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m

"Tony Johansson" <johansson.ande rsson@telia.com wrote in message
news:klGUk.4215 $U5.29009@newsb .telia.net...

Hello!
>
If I have string name = "Mytest";
and
Type test1 = Type.GetType(na me);
and
Type test2 = name.GetType();
then the first one will assign null to test1
but the second test2 will be given the correct type which is System.String
>
Now to my question why will test1 be assign null I would assume that
System.String would be assigned
because name is of that type
>
//Tony
>
>

[Jeff Johnson]

Re: about the Type type

"Jeff Johnson" <i.get@enough.s pamwrote in message
news:OGWozTcSJH A.1172@TK2MSFTN GP03.phx.gbl...

>Now to my question why will test1 be assign null I would assume that
>System.Strin g would be assigned
>because name is of that type

Okay, it just occured to me what you're trying to do. C# has a special
keyword for this:

Type test1 = typeof(name);

[Nicholas Paldino [.NET/C# MVP]]

Re: about the Type type

That's not going to work. You can use typeof only when you use the
actual name. It's not an alias for the overload of the static GetType
method. That line will fail to compile.

--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m

"Jeff Johnson" <i.get@enough.s pamwrote in message
news:%232x6MYcS JHA.4764@TK2MSF TNGP05.phx.gbl. ..

"Jeff Johnson" <i.get@enough.s pamwrote in message
news:OGWozTcSJH A.1172@TK2MSFTN GP03.phx.gbl...
>

>>Now to my question why will test1 be assign null I would assume that
>>System.Stri ng would be assigned
>>because name is of that type

>
Okay, it just occured to me what you're trying to do. C# has a special
keyword for this:
>
Type test1 = typeof(name);
>

[Jeff Johnson]

Re: about the Type type

"Nicholas Paldino [.NET/C# MVP]" <mvp@spam.guard .caspershouse.c omwrote in
message news:5F773B66-39BB-41FD-BB35-5A6D02C68861@mi crosoft.com...

>Type test1 = typeof(name);

That's not going to work. You can use typeof only when you use the
actual name. It's not an alias for the overload of the static GetType
method. That line will fail to compile.

Ah, you're right. I use typeof() so infrequently I forgot that I usually
only use it as typeof(<EnumCla ssName>) and that you supply the real type
name, not a variable.

So using <variable>.GetT ype() is really the only way, isn't it?

[Peter Duniho]

Re: about the Type type

On Tue, 18 Nov 2008 13:21:20 -0800, Tony Johansson
<johansson.ande rsson@telia.com wrote:

Hello!
>
If I have string name = "Mytest";
and
Type test1 = Type.GetType(na me);
and
Type test2 = name.GetType();
then the first one will assign null to test1
but the second test2 will be given the correct type which is
System.String
>
Now to my question why will test1 be assign null I would assume that
System.String would be assigned
because name is of that type

The answer is in the documentation that Jeff posted. The two methods
you're looking at have the same name, but they do entirely different
things. Thus they return entirely different values. And in the case of
Type.GetType(st ring), since you don't have a type named "Mytest" in your
assembly, it returns null.

Pete

[Nicholas Paldino [.NET/C# MVP]]

Re: about the Type type

Jeff,

Well, assuming the variable is of the type that the OP wants to get,
then yes, that is. If all the OP has is the name in a string, then calling
the static GetType method is the way to go.

--
- Nicholas Paldino [.NET/C# MVP]
- mvp@spam.guard. caspershouse.co m

"Jeff Johnson" <i.get@enough.s pamwrote in message
news:%236BPnlcS JHA.5568@TK2MSF TNGP05.phx.gbl. ..

"Nicholas Paldino [.NET/C# MVP]" <mvp@spam.guard .caspershouse.c omwrote
in message news:5F773B66-39BB-41FD-BB35-5A6D02C68861@mi crosoft.com...
>

>>Type test1 = typeof(name);

>

> That's not going to work. You can use typeof only when you use the
>actual name. It's not an alias for the overload of the static GetType
>method. That line will fail to compile.

>
Ah, you're right. I use typeof() so infrequently I forgot that I usually
only use it as typeof(<EnumCla ssName>) and that you supply the real type
name, not a variable.
>
So using <variable>.GetT ype() is really the only way, isn't it?
>