How to link custom action to control event

Question

I'm studying Wix to build product installer. I've customized the UI successfully but be wondering how to link a custom action to control event (i.e PushButton).

I have 2 projects:

Product.Wix.CustomActions

[CustomAction]
public static ActionResult CustomAction1(Session session)
{
 session.Log("Begin CustomAction1");
 MessageBox.Show("CustomActions1");
 return ActionResult.Success;
}

Product.Wix.Setup (referenced to Product.Wix.CustomActions project). In Setup.wxs, I have declared a custom action:

<Binary Id="CustomActions" SourceFile="..\Product.Wix.CustomActions\bin\Debug\Product.Wix.CustomActions.CA.dll" />
<CustomAction Id='Action1' BinaryKey='CustomActions' DllEntry='CustomAction1' Execute='immediate' Return='check' />

I have a custom dialog with Connect button and wiring to the action as below:

<Control Id="Connect" Type="PushButton" X="325" Y="75" Width="30" Height="17" Text="...">
<Publish Event="DoAction" Value="Action1">1</Publish>
</Control>

It does not work as I expected it should pop-up a message box when clicking on the Connect button.

Answer 1

Am not sure whether MessageBox.Show() will work. Also its better to go with WIX dialogs as you can capture the option selected by user on the popup.

Example

<Control Id="TestConn" Type="PushButton" X="265" Y="205" Width="70" Height="18" Text="&amp;Test Connection">
    <Publish Event="DoAction" Value="Action1">1</Publish>
    <Publish Property="ERRORMSG" Value="CustomActions1">ACCEPTED = "1"</Publish>
    <Publish Event="SpawnDialog" Value="InvalidDBConnDlg">ACCEPTED = "0"</Publish>
</Control>

<Dialog Id="InvalidDBConnDlg" Width="260" Height="120" Title="[ProductName]">
    <Control Id="OK" Type="PushButton" X="102" Y="90" Width="56" Height="17" Default="yes" Cancel="yes" Text="OK" />
    <Control Id="Text" Type="Text" X="48" Y="22" Width="194" Height="60" Text="[MSGVAR]" />
    <Control Id="Icon" Type="Icon" X="15" Y="15" Width="24" Height="24" ToolTip="Information icon" FixedSize="yes" IconSize="32" Text="WixUI_Ico_Info" />
</Dialog>

Custom Action

[CustomAction]
public static ActionResult CustomAction1(Session session)
{
    session["MSGVAR"] = "Some Message";
    return ActionResult.Success;
}

Answer 2

The log file shows my custom action assemblies could not be loaded properly. The reason is I have unintentionally removed the section:

<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0" />
</startup>

from the config file. Added it back and everything works now.