Prevent Delete - Using plugin in CRM 2011

Question

How to prevent delete based on condition in a plugin in Microsoft Dynamics CRM 2011? I have tried InvalidPluginExecutionException but it is not working.

This is my code.

try
{
    if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)
    {
        Entity entity = (Entity)context.InputParameters["Target"];
        new_testing testing = entity.ToEntity<new_testing>();
        if (testing.new_hutang.Value == true)
        {
            throw new InvalidPluginExecutionException("error delete");
        }
    }
}
catch (InvalidPluginExecutionException e)
{
    Console.WriteLine("cancel delete plugin" + e);
}

Can you please help me on what needs to be done?

Answer 1

You need to add a PreImage to the Plugin Registration for the field "new_hutang." The Target entity won't include all the fields on a delete by default, but the PreImage entity will if you specify it when you register your plugin. See this blog post for more information: https://deepakexploring.wordpress.com/2011/02/04/preentityimages-and-postentityimages-in-crm-5-0-2011/

Answer 2

Additional to @Josh Painter (which is the best approach) you can also use a javascript instruction to make sure that the field is included.

Xrm.Page.getAttribute("new_hutang").setSubmitMode("always");

This line could be inside an onsave function that you would "attach" to the OnSave envent of the form. This would also ensure that the field exists in your plugin.