Plugin Triggered by lookup field

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Posted on by Community Member

Hi guys, i have plugin that triggered by lookup, when lookup value is change, the plugin will execute some logic. But this also cause problem when i clear/set to empty the lookup value, its returning object reference not set to an object. How to avoid this, i mean when the lookup value is set to empty. Just avoid the logic. The plugin registered on Update Message

Entity e = (entity)context.InputParameters["target"];


if(e.Attributes.Contains("new_lookup"){

  Guid lookup_value = (e.GetAttributeValue<EntityReference>("new_lookup)).Id;

  if(lookup_value != Guid.empty){
    //Do Logic
  } 

}

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BadrinathB 970 on at

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RE: Plugin Triggered by lookup field

Hi Fikri,

Please add a null check as well.

Entity e = (entity)context.InputParameters["target"];

if((e.Attributes.Contains("new_lookup") && e.GetAttributeValue<EntityReference>("new_lookup))!= null){

Guid lookup_value = (e.GetAttributeValue<EntityReference>("new_lookup)).Id;

if(lookup_value != Guid.empty){

//Do Logic

}

}
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Ben Thompson 6,350 on at

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RE: Plugin Triggered by lookup field

When you sent an lookup to be empty the returned entity reference itself is null not just the id within the entity reference.

You need something like

if (e.Contains("new_lookup") && e.GetAttributeValue<EntityReference>("new_lookup")!=null)){ }
gdas 50,091 Moderator on at

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RE: Plugin Triggered by lookup field

Hi,

In this case the plugin should be registered deassociate message.