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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gdas 50,091 Moderator on at

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Hi,

In this case the plugin should be registered deassociate message.

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Ben Thompson 6,350 on at

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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)){ }

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BadrinathB 970 on at

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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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