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You invoke static methods on the object itself, not a specific instance of that object. In your case, you don't need the FindByTypeName method or call. Instead, you would want to do this:
static void Main()
{
Customer[] customers = Customer.FindAll();
Product[] products = Product.FindAll();
}
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Thank you.
I read class name ( Customer, Products etc) from database.
Some class names are not known at design time.
So I cannot use hard coded class names.
How to invoke method if class name is passed as string to this procedure ?
Andrus
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reflection, I guess
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Thank you. Itried reflection but got assertion failed error.
What I'm doing wrong ?
using System.Collections.Generic;<br />
using System;<br />
using System.Windows.Forms;<br />
<br />
class TestApplication {<br />
static void Main() {<br />
MessageBox.Show(FindByTypeName("Customer").ToString());<br />
}<br />
<br />
static object[] FindByTypeName(string typename) {<br />
Type t = Type.GetType(typename);<br />
System.Reflection.MethodInfo mi = t.GetMethod("FindAll",<br />
System.Reflection.BindingFlags.Static);<br />
<br />
System.Diagnostics.Debug.Assert(mi != null);<br />
object[] entity = (object[])mi.Invoke(null, null);<br />
return entity;<br />
}<br />
}<br />
<br />
class Customer : ActiveRecordBase<Customer> {<br />
}<br />
<br />
class Product : ActiveRecordBase<Product> {<br />
}<br />
<br />
public class ActiveRecordBase<T> {<br />
public static T[] FindAll() {<br />
return null;<br />
}<br />
}
Andrus
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I think you need to supply both BindingFlags.Static | BindingFlags.Public to GetMethod.
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With .NET 2.0, it's noted that accessibility of classes need not be defined, since classes can be inherited within the same assembly.
When the superclass is given accessibility as public, the program runs successfully. However setting the inherited class as public, error messages are displayed:
public class myClass : TestConsole.MainConsole
Error: Inconsistent accessibility: base class 'TestConsole.MainConsole' is less accessible than class 'TestConsole.myClass'
What is the default accessibility level when it is not explicitly defined?
For example the following code is successfully built:
Program.cs
--------------------
using System;
using System.Collections.Generic;
using System.Text;
namespace TestConsole
{
class MainConsole
{
public const int myAge = 27;
public int returnZero()
{
return 0;
}
static void Main(string[] args)
{
Console.WriteLine("Start program");
}
}
myClass.cs
---------------------------
using System;
using System.Collections.Generic;
using System.Text;
namespace TestConsole
{
class myClass : TestConsole.MainConsole
{
private int Age;
public myClass()
{
Age = base.returnZero();
}
}
}
Jon
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coz the Child Class is Default (Private) u change Change
class myClass : TestConsole.MainConsole
into
Public class myClass : TestConsole.MainConsole
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The default accessibility is always private. This applies to classes, methods, properties, and fields.
In your code sample, defining MainConsole with out specifying the accessibility makes it private. However, the problem you are running into isn't the accessibility on the class since in this case, they are both private.
In MainConsole you do not have a default constructor, so the compiler is generating one for you. The compiler generated constructor is always private. When you then try to derive MyClass from it, MyClass has a public constructor. What the compiler sees is that you have a class with a public constructor inheriting from one with a private constructor and says that there is no way for the derived class to create an instance of the base class. (If something is private, even the derived classes don't have visibility to it.)
[modification 13:28 Tuesday 4th September, 2007]
I was wrong on this response, not sure what I was thinking. See this response: http://www.codeproject.com/script/comments/forums.asp?forumid=1649&select=2209501&mpp=50&fr=354&df=100#xx2209501xx[^]
[/modification]
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Hmmm, default accessibility for classes and structs is internal, nested classes and structs are private. If you create no constructors for a class it will have a default public constructor.
The error he gets is because MainConsole is internal and he creates a public class that inherits from it.
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You're right...I'm not sure what I was thinking when I wrote that response.
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Default accessibility is private for everything but namespace elements.
That means classes, structs, delegates or enums that are not defined within another class are by default internal. In all other cases accessibility defaults to private.
In your case, the myClass and MainConsole classes are internal.
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how van i change default printer page size to A6? i got printer name from installedprinters and i want to change page size of it to A6
thank you
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is there any managed code for it?
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Hi everyone,
Im trying to create a Container Control, which has selfdrawn borders and a few buttons to do something with it. I would like that my Control behaves professional, like a Windows.Forms.Control.
But now comes my Problem:
All I want to achieve is that no SubControl which I add to my Control can overlay the Control's borders.
I've tried to redirect the ControlCollection with my own inherited ControlCollection to an inner Panel wich then would have exact the ClientSize i want. - That works fine as long as you are not working with the Visual-Studio Designer else it throws NullReferenceExceptions or IndexOutOfRangeExceptions(Because the Control's Collection doesnt contain the inner Panel).
So now my next thought was to manipulate the ClientSize. A Form has a smaller ClientSize according to its Size then a Control because of its Border. So what if someone like me, wants his Control to have a different Border then the usual "FixedSingle,Fixed3d and None" then he must have to manipulate the CLientSize according to his Control's Border.
Ok unfortunatly Im not able to achieve this because when I resize the CLientSize also the Size Property changes and vise versa.
Hope someone has an idea how I could break this behavior.
Thanks in advance and sorry for my spelling mistakes.
XXX
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I can't insert breakpoints with F9 anymore in Visual Studio. Any tip what can be wrong? (I can use F5 to rum my program so it is not the F-lock button that is dissabled)
_____________________________
...and justice for all
APe
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Hello everyone,
I am using Visual Studio 2005 to develop a C# COM Class Library project. There is a setting in Build --> Output, called *Register for COM Interop*. What is the usage of this setting? In my situation, do I need to set this option?
thanks in advance,
George
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Indicates that your managed application will expose a COM object (a COM callable wrapper) that allows a COM object to interact with your managed application. The Output type property in the Application page of the Project Designer for this application must be set to Class Library in order for the Register for COM interop property to be available. For an example class that you might include in your Visual C# application and expose as a COM object, see Example COM Class (C# Programming Guide).
using System.Runtime.InteropServices;
namespace project_name
{
[Guid("EAA4976A-45C3-4BC5-BC0B-E474F4C3C83F")]
public interface ComClass1Interface
{
}
[Guid("7BD20046-DF8C-44A6-8F6B-687FAA26FA71"),
InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]
public interface ComClass1Events
{
}
[Guid("0D53A3E8-E51A-49C7-944E-E72A2064F938"),
ClassInterface(ClassInterfaceType.None),
ComSourceInterfaces(typeof(ComClass1Events))]
public class ComClass1 : ComClass1Interface
{
}
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Thanks Yanshof,
I am wondering what detailed operations is Visual Studio 2005 doing if this option is selected in your sample.
I am wondering what is the differences between using this Visual Studio 2005 option and do the following work by myself,
1. regasm /codebase <assembly name="">;
2. regasm /tlb <assembly name="">.
regards,
George
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George_George wrote: Register for COM Interop
It would, I guess, automatically create necessary type libraries and called regsvr32 also for you.
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Hi Vasudevan,
For C# managed COM, it should be mscoree.dll other than regsvr32 which is acting as the host for all COM components, right?
regards,
George
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