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355I created a Plugin which is triggered while updating a Movie and shows an error when the fields "Title" and "Year" are left empty.
I also need to use PreImage to check whether the value is present in the pre-image but not in the target, i.e. if it was erased by the user.
I wrote the following code, but it doesn't work, can you please tell me if I'm using preImage and PostImage correctly?
public void Execute(IServiceProvider serviceProvider)
{
var context = new PluginContext(serviceProvider);
var service = context.CrmServiceSystem;
var trace = context.TracingService;
var target = context.GetTarget();
var preImage = context.GetPreImage();
if (target == null)
return;
var postImage = preImage.Merge(target);
// case 1: the field is left empty and it was empty before too:
if((!preImage.Attributes.Contains("title") && !postImage.Attributes.Contains("title"))
||
// case 2: the field was not empty, but the user deleted the content:
(preImage.Attributes.Contains("title") && !postImage.Attributes.Contains("title")))
{
throw new InvalidPluginExecutionException(OperationStatus.Failed, "Title can't be null");
}
if ((!preImage.Attributes.Contains("year") && !postImage.Attributes.Contains("year"))
||
(preImage.Attributes.Contains("year") && !postImage.Attributes.Contains("year")))
{
throw new InvalidPluginExecutionException(OperationStatus.Failed, "Year is null!");
}
}
For instance, I have this issue: when the Year is already correct and I don't modify it, I get the error "Year can't be null". As I merged the PreImage with the target, why the value is not recognized?
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