You may receive the System.Reflection.TargetInvocationException unhandled exception when you use the FormsFactory class to open a form in Small Business Accounting (906467)

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Run the following code that constructs and then uses the FormsFactory class and the Small Business Accounting form in the domain that is explicitly created.

The following code creates the application domain.

AppDomain myDomain = AppDomain.CreateDomain(
	"MyDomain", 
	null, 
	GetSbaFullBusinessLogicAssemblyPath(""), 
	"My Integration;Small Business Accounting", 
	false);

ObjectHandle objectHandle = myDomain.CreateInstance(
	Assembly.GetExecutingAssembly().FullName,
	"SBA.ExecutingCode");

ExecutingCode ec = (ExecutingCode) objectHandle.Unwrap();

ec.LaunchCustomerForm();

The following code adds the directories that are involved in the application domain.

static string GetSbaFullBusinessLogicAssemblyPath(string assemblyName)
{
	// If you run the Setup program, the installation path is in the registry.
	const string InstallPathRegKey = 
		@"SOFTWARE\Microsoft\Business Solutions eCRM\2.0";
	const string MagellanInstallPathRegKey = 
		@"SOFTWARE\Microsoft\Business Solutions eCRM";
	const string InstallPathRegValue = "AccountingUI";            
	const string DefaultPath = 
		@"C:\Program Files\Microsoft Small Business\";

	StringBuilder installPath = new StringBuilder();

	RegistryKey regkey = 
		Registry.LocalMachine.OpenSubKey(InstallPathRegKey);

	if (regkey != null)
	{
		// A Small Business Accounting installation exists.
		installPath.Append(
			regkey.GetValue(InstallPathRegValue).ToString());

		// This line removes the file name and the Small Business Accounting folder.
		if (installPath.ToString().EndsWith("sbaui.dll"))
		{
			int lastSlash = installPath.ToString().LastIndexOf(@"\");
			int charToEnd = installPath.Length - (lastSlash);

			// This line tells where the last slash is.
			installPath.Remove(lastSlash, charToEnd);

			// This line finds the newest last slash.
			lastSlash = installPath.ToString().LastIndexOf(@"\");

			// This line determines how many characters the Remove method must remove.
			charToEnd = installPath.Length - (lastSlash);

			// This line removes the directory name.
			installPath.Remove(lastSlash, charToEnd);
		}
	}
	else 
	{
		// This line looks for a Magellan installation. 
		regkey =			Registry.LocalMachine.OpenSubKey(MagellanInstallPathRegKey);

		if (regkey != null)
		{
			Object temp = regkey.GetValue(InstallPathRegValue);

			if (temp != null)
			{
				installPath.Append(temp.ToString() );
			}
		}
	}

	if (regkey != null)
	{
		regkey.Close();
	}

	if (installPath.Length == 0)
	{
		// This line appends the default value of the installation path.
		installPath.Append(DefaultPath);
	}

	installPath.Append(assemblyName);

	return installPath.ToString();
}

The following code creates an instance of the ExecutingCode class that opens the Small Business Accounting form by using the FormsFactory class.

[Serializable]
public class ExecutingCode : MarshalByRefObject
{
	public void LaunchCustomerForm()
	{
		ObjectHandle sbiHandle = 
			AppDomain.CurrentDomain.CreateInstance(
				"SBAAPI",
				"Microsoft.BusinessSolutions.SmallBusinessAccounting.SmallBusinessInstance");

		ISmallBusinessInstance iSbi = 
			(ISmallBusinessInstance) sbiHandle.Unwrap();

		// This line determines that you can log on by using the database name and the server name.
		iSbi.LogOn(companyName, serverName);

		DataRow dr = iSbi.CustomerAccounts.DataView.Table.Rows[6];
		ICustomerAccount cust = 
			(ICustomerAccount)iSbi.CustomerAccounts.GetByDataRow(dr);

		ObjectHandle ffHandle = AppDomain.CurrentDomain.CreateInstance(
			"SBAUI", 
			"Microsoft.BusinessSolutions.SmallBusinessAccounting.UI.FormsFactory");
		IFormsFactory iFF = (IFormsFactory) ffHandle.Unwrap();
		iFF.Initialize(iSbi);
		Form form = iFF.CreateForm(cust);
		form.ShowDialog();
		form.Dispose();
		iFF.UnInitialize(false);
	}
}