Re: How can I detect the presense of an optional assembly and call a method within it?
- From: "MUS" <moizshaikh@xxxxxxxxx>
- Date: 25 Oct 2005 01:43:21 -0700
Hello Gaetan!
Well this might not be the perfect Plugin approach (i.e. have a static
reference to client assembly) but just an idea, may be you feel worth
implementing. Its based on the use of config file and reflection.
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="ClientSection"
type="System.Configuration.DictionarySectionHandler" />
</configSections>
<!-- Custom Section -->
<ClientSection>
<add key="BusinessAssembly" value="<your_assembly>" />
<add key="BusinessType" value="<your_type>" />
<add key="BusinessMethod" value="<your_method>" />
</ClientSection>
<!-- / Custom Section -->
</configuration>
public Object DoAction()
{
try
{
Hashtable configData = (Hashtable)
ConfigurationSettings.GetConfig("ClientSection");
if(configData==null) throw new ArgumentNullException("Unable to read
configuration section");
// Get Assembly
String strAssembly =
Convert.ToString(configData["BusinessAssembly"]);
Assembly assembly = Assembly.Load(strAssembly);
if(assembly==null) throw new Exception("Unable to load assembly:
"+assemblyName);
// Get Type
String strType = Convert.ToString(configData["BusinessType"]);
Type workingType = assembly.GetType(strType);
if(workingType==null) throw new Exception("Unable to load type:
"+workingType);
// Get Method
String strMethod = Convert.ToString(configData["BusinessMethod"]);
MethodInfo methodInfo = workingType.GetMethod(strMethod);
if(methodInfo==null) throw new Exception(strAssembly+" (type:
"+workingType+") doesnot contain "+strMethod);
// Type Instance
Object obj = assembly.CreateInstance(strType, true);
if(obj==null) throw new Exception("Instantiation failed for
"+strType);
// Invoke Method
Object objReturnValue = methodInfo.Invoke(obj, null);
return objReturnValue;
}
catch(Exception ex) { throw ex; }
}
Its just a thought, I hope this might be of some help. I cant predict
the correctness of the code since i wrote it in "wordpad" [i have a
problem with my VS.NET] :-)
Let me know in case of any inconsistancy.
Regards,
Moiz Uddin Shaikh
Software Engineer
Kalsoft (Pvt) Ltd
.
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