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Type.GetType returns null when called via COM interop


Type.GetType returns null when called via COM interop

By : user2953853
Date : November 21 2020, 07:31 AM
seems to work fine My crystal ball says that Type.GetType(string) returns null because you haven't done anything to help the CLR find the assembly that contains your MySettingProvider class. Which is required, the CLR doesn't stand much of a chance to find it by itself. Something you can quickly test by yourself by copying the assembly into the same directory as "native.exe" so it is in the probing path.
Which is a wholly inappropriate solution of course, a [ComVisible] assembly doesn't get to choose what kind of app uses it. You need to help by storing any dependency that you have in the GAC. Also the place where your main assembly belongs, the GAC is a good solution for COM's DLL Hell problems. On the user's machine anyway, you can test on your own machine by copying files. You may be able to get AppDomain.AssemblyResolve to work, but you'd need a "global" object like Application to ensure you registered the event handler in a timely matter.
code :


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Type.GetType returns null when using MEF

Type.GetType returns null when using MEF


By : Mahwish Fatima
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , I'm currently using MEF for a project to import plugins, as the plugins are written in WPF they each have a view and a viewmodel. The plugins know about the viewmodel but the main shell UI will construct the view and bind the viewmodel using a convention over configuration type pattern. , It's probably easiest to do something like this:
code :
var modelType = this.Plugins.First().ViewModel.GetType();
var viewTypeName = modelType.FullName.Replace("Model", string.Empty);
var viewType = modelType.Assembly.GetType(viewTypeName);
Type.GetType(string typeName) returns null

Type.GetType(string typeName) returns null


By : Louisa
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further If you know that whatever type it is will be within DataAccessLayer, then I'd get an Assembly reference as simply as possible, e.g.
code :
 Assembly assembly = typeof(AnyPublicTypeWithinTargetAssembly).Assembly;
 Type type = assembly.GetType(namespaceQualifiedTypeName);
Type.GetType method returns null value

Type.GetType method returns null value


By : carnah
Date : March 29 2020, 07:55 AM
I wish this help you Just use Nullable.GetUnderlyingType(objProperty.PropertyType) directly.
It's useless to first call ToString() on it, and then use Type.GetType(...) on the string output!
Type.GetType returns null

Type.GetType returns null


By : Abed Nashef
Date : March 29 2020, 07:55 AM
this one helps. This might be a stretch, but have you marked your modules with the IModuleExport Interface using the ModuleExportAttibute?
code :
[ModuleExport("TestModule", typeof(TestModule), InitializationMode = InitializationMode.OnDemand)]
public class MainMenuControlModule : IModule
Loading C# DLL with powershell, [System.Type]::GetType returns null

Loading C# DLL with powershell, [System.Type]::GetType returns null


By : baimei
Date : March 29 2020, 07:55 AM
will help you
Use Add-Type -Path to load your assembly.
code :
# Compile the C# source code to assembly .\ClassLibrary1.dll
Add-Type -TypeDefinition @'
    namespace ClassLibrary1
    {
        public class Class1
        {
            public static void Test()
            {
            System.Diagnostics.Process.Start("CMD.exe", "/C calc"); 
            }
        }
    }
'@ -OutputAssembly .\ClassLibrary1.dll  


# Define the path to the assembly. Do NOT use "\\" as the path separator.
# PowerShell doesn't use "\" as the escape character.
$Path      = ".\ClassLibrary1.dll" 
$Namespace = "ClassLibrary1"
$ClassName = "Class1"
$Method    = "Test"
$Arguments = $null

# Load the assembly by its filesystem path, using the Add-Type cmdlet.
# Use of relative paths works.
Add-Type -Path $Path

$Full_Class_Name = "$Namespace.$ClassName"

# To get type [ClassLibrary1.Class1] by its full name as a string,
# simply cast to [type]
$Type            = [type] $Full_Class_Name

$MethodInfo = $Type.GetMethod($Method)
$MethodInfo.Invoke($null, $Arguments)
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