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Creating C# List Using dotNET

Occasional Contributor

Creating C# List Using dotNET



I want to create a script using TestComplete to test a C# API one of my colleagues wrote. How would I go about creating a C# list with TestComplete since it requires all arguments to be passed to a C# function, even though all arguments have a default value. I am using the CLR Bridge to load the DLL for the API. I  want to use dotNET in order to call these functions. 


// Here are two C# functions I want to call:


1) public short SendRequest(List<IP> ipList, double timeout = 2.0)


2) public void RefreshWindow(List<Devices> deviceList = null, int maxAttempts = 3, double timeout=2.0) 



// So Far all I got to work is this but that just creates a list of 'Sytem.Object' not a list of the class I want. 

// I found this example here


var typeListOf = dotNET.System.Type.GetType("System.Collections.Generic.List`1");
var paramTypes = dotNET.System.Array.CreateInstance(dotNET.System.Type.GetType("System.Type"), 1);
var objType = dotNET.System.Type.GetType("System.Object");
paramTypes.SetValue(objType, 0);
var typeListOfString = typeListOf.MakeGenericType(paramTypes);
var list = dotNET.System.Activator.CreateInstance_3(typeListOfString);

Any help would be greatly appreciated. 






SmartBear Alumni (Retired)

Hi socc3rpr0,


Please keep in mind that TestComplete is a GUI testing tool, it's not really suitable for .NET API unit testing. Consider using a unit testing tool like NUnit, MSTest,, etc.


That said, your example is almost correct. You only need to specify the appropriate type - IP or Devices - for objType:

var objType = dotNET.System.Type.GetType("Namespace.Whatever.IP");

var objType = dotNET.System.Type.GetType("Namespace.Whatever.Devices");

The assembly containing the IP and Devices classes needs to be in the CLR Bridge list.


Once you have created the list you can add list items as follows:

var ip1 = dotNET.name_space.IP.zctor(parameters);
var ip2 = dotNET.name_space.IP.zctor(parameters);


Helen Kosova
SmartBear Documentation Team Lead
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> Consider using a unit testing tool like NUnit, MSTest,, etc.

Or TestLeft ( which will provide you all power of .Net programming while keeping you within TestComplete's eco-system (Object Browser, Log, etc.).

  /Alex [Community Champion]
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Frequent Contributor

I know its very old, but I had the same Problem and with the suggestion it didnt work, because it just wouldnt know the class i type into the 



I managed it with 


objType = dotNET.namespace_further_further_whatever.ClassIwant.zctor().GetType()

So i just created a new instance of the class i needed and used the GetType onto it, this way the type set was exactly what I needed


As for the whole construct:


typeListOf = dotNET.System.Type.GetType("System.Collections.Generic.List`1")
objType = dotNET.namespace_further.SpecificValueClass.zctor().GetType()
paramTypes = dotNET.System.Array.CreateInstance(dotNET.System.Type.GetType("System.Type"), 1)
paramTypes.SetValue(objType, 0)
typeListOfString = typeListOf.MakeGenericType(paramTypes)

newValue = dotNET.namespace.WattPeakValues.zctor()

newValue.ID = 1
SmartBear Alumni (Retired)

Thanks for sharing your solution with us, @Lagencie!

Tanya Yatskovskaya
SmartBear Community and Education Manager

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