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System.Reflection - Loading Assemblies

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Jon Ceanfaglione

I'm having some difficulty with the Reflection class and I'm at my wits end.

If I do this everything works fine:

public void invokeMethod(string sMethodName)
{
    object obj = null;

    Type type = typeof(MyNameSpace.MyClass);

    // Create an instance of AccountEnumeration in Memory
    obj = Activator.CreateInstance (type);

    //Get info for method
    MethodInfo mi = type.GetMethod(sMethodName);

    //invoke method
    mi.Invoke(obj, null);
}

But let's say I want to make the class that is loaded dynamic too (code
below). I get an error that the assembly could not be found. Any ideas?
Thanks!

public void invokeMethod(string sMethodName, string sClassName)
{

    object obj = null;
    Assembly a = null;
    Type type = null;

    try
    {
        //Get routing class type
        type = a.GetType(sClassName);
    }
    catch(Exception e)
    {
        System.Web.HttpContext.Current.Response.Write(e.Message);
    }

    // Create an instance of AccountEnumeration in Memory
    obj = Activator.CreateInstance (type);

    //Get info for method
    MethodInfo mi = type.GetMethod(sMethodName);

    //invoke method
    mi.Invoke(obj, null);

}

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Sinnott, John

Don't you need to set the assemly reference "a" to a valid object?

- John

[Original message clipped]

Reply to this message...

Jon Ceanfaglione

It's there.... bad cut and paste -- the function looks like:

public void invokeMethod(string sMethodName, string sClassName, string
sNameSpace)
{

    object obj = null;
    Assembly a = null;
    Type type = null;

    try
    {
        a = Assembly.Load(sNameSpace);
    }
    catch(Exception e)
    {
        System.Web.HttpContext.Current.Response.Write(e.Message);
    }

    //Get routing class type
    type = a.GetType(sClassName);

    // Create an instance of AccountEnumeration in Memory
    obj = Activator.CreateInstance (type);

    //Get info for method
    MethodInfo mi = type.GetMethod(sMethodName);

    //invoke method
    mi.Invoke(obj, null);

}

the line I get the error is:

a = Assembly.Load();

-----Original Message-----
From: Sinnott, John [mailto:Click here to reveal e-mail address]
Sent: Wednesday, November 21, 2001 2:34 PM
To: ngfx-reflection
Subject: [ngfx-reflection] RE: System.Reflection - Loading Assemblies

Don't you need to set the assemly reference "a" to a valid object?

- John

[Original message clipped]

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Reply to this message...

<1154-114@onlinehome.de>

It's not clear, what your sNameSpace is - i would try
string filePath ; //some file path like
            //System.Environment.CurrentDirectory +
"\\MyDll.dll"

Assembly.LoadFrom(filePath);

-----Original Message-----
From: Jon Ceanfaglione [mailto:Click here to reveal e-mail address]
Sent: Mittwoch, 21. November 2001 21:18
To: ngfx-reflection
Subject: [ngfx-reflection] RE: System.Reflection - Loading Assemblies

It's there.... bad cut and paste -- the function looks like:

public void invokeMethod(string sMethodName, string sClassName, string
sNameSpace)
{

    object obj = null;
    Assembly a = null;
    Type type = null;

    try
    {
        a = Assembly.Load(sNameSpace);
    }
    catch(Exception e)
    {

System.Web.HttpContext.Current.Response.Write(e.Message);
    }

    //Get routing class type
    type = a.GetType(sClassName);

    // Create an instance of AccountEnumeration in Memory
    obj = Activator.CreateInstance (type);

    //Get info for method
    MethodInfo mi = type.GetMethod(sMethodName);

    //invoke method
    mi.Invoke(obj, null);

}

the line I get the error is:

a = Assembly.Load();

-----Original Message-----
From: Sinnott, John [mailto:Click here to reveal e-mail address]
Sent: Wednesday, November 21, 2001 2:34 PM
To: ngfx-reflection
Subject: [ngfx-reflection] RE: System.Reflection - Loading Assemblies

Don't you need to set the assemly reference "a" to a valid object?

- John

[Original message clipped]

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hereby notified that any dissemination, distribution, or copying of this
communication, or any of its contents, is strictly prohibited. If you
have received this communication in error, please re-send this
communication to the sender and delete the original communication and
any copy of it from your computer system. Thank you.

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Reply to this message...

Jon Ceanfaglione

I'll try using LoadFrom. But, sNameSpace should and is the name of the
namespace for the class:

namespace SomeNameSpace{

    public class SomeClass
    {
        public void SomeMethod()
        {

        }
    }
}

Thus, I could invoke SomeMethod by using:

invokeMethod(SomeMethod,SomeClass,SomeNameSpace)

I don't know if that clears it up, but I will try the LoadFrom method.

Thanks.

Jon
-----Original Message-----
From: Click here to reveal e-mail address [mailto:Click here to reveal e-mail address]
Sent: Wednesday, November 21, 2001 5:42 PM
To: ngfx-reflection
Subject: [ngfx-reflection] RE: System.Reflection - Loading Assemblies

It's not clear, what your sNameSpace is - i would try
string filePath ; //some file path like
            //System.Environment.CurrentDirectory +
"\\MyDll.dll"

Assembly.LoadFrom(filePath);

-----Original Message-----
From: Jon Ceanfaglione [mailto:Click here to reveal e-mail address]
Sent: Mittwoch, 21. November 2001 21:18
To: ngfx-reflection
Subject: [ngfx-reflection] RE: System.Reflection - Loading Assemblies

It's there.... bad cut and paste -- the function looks like:

public void invokeMethod(string sMethodName, string sClassName, string
sNameSpace)
{

    object obj = null;
    Assembly a = null;
    Type type = null;

    try
    {
        a = Assembly.Load(sNameSpace);
    }
    catch(Exception e)
    {

System.Web.HttpContext.Current.Response.Write(e.Message);
    }

    //Get routing class type
    type = a.GetType(sClassName);

    // Create an instance of AccountEnumeration in Memory
    obj = Activator.CreateInstance (type);

    //Get info for method
    MethodInfo mi = type.GetMethod(sMethodName);

    //invoke method
    mi.Invoke(obj, null);

}

the line I get the error is:

a = Assembly.Load();

-----Original Message-----
From: Sinnott, John [mailto:Click here to reveal e-mail address]
Sent: Wednesday, November 21, 2001 2:34 PM
To: ngfx-reflection
Subject: [ngfx-reflection] RE: System.Reflection - Loading Assemblies

Don't you need to set the assemly reference "a" to a valid object?

- John

[Original message clipped]

| [ngfx-reflection] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngbeta.asp = JOIN/QUIT
| http://www.asplists.com/search = SEARCH Archives

__________________________________________________

The information contained in this communication is intended only for the
use of the recipient named above, and may be legally privileged,
confidential and exempt from disclosure under applicable law. If the
reader of this communication is not the intended recipient, you are
hereby notified that any dissemination, distribution, or copying of this
communication, or any of its contents, is strictly prohibited. If you
have received this communication in error, please re-send this
communication to the sender and delete the original communication and
any copy of it from your computer system. Thank you.

| [ngfx-reflection] member Click here to reveal e-mail address = YOUR ID
| http://www.asplists.com/asplists/aspngbeta.asp = JOIN/QUIT
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__________________________________________________

The information contained in this communication is intended only for the use
of the recipient named above, and may be legally privileged, confidential
and exempt from disclosure under applicable law. If the reader of this
communication is not the intended recipient, you are hereby notified that
any dissemination, distribution, or copying of this communication, or any of
its contents, is strictly prohibited. If you have received this
communication in error, please re-send this communication to the sender and
delete the original communication and any copy of it from your computer
system. Thank you.

Reply to this message...

	System.Activator
	System.Environment
	System.Reflection.Assembly
	System.Reflection.MethodInfo
	System.Web.HttpContext

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