Microsoft Dynamics CRM (Archived)

GetAttributeValue returns null

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Posted on by Community Member

Hello,

In a c# plug-in, i try to get the value of a field with logical name "asip_categorie", type Picklist (OptionSet).

Data is filled in asip_categorie.

The method GetAttributeValue returns null and i get an exception. Why?

Code :

if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)
{
Entity entity = (Entity)context.InputParameters["Target"];

var Categorie = entity.GetAttributeValue<OptionSetValue>("asip_categorie");

...

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Abhishek Gupta 2,003 on at

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RE: GetAttributeValue returns null

HI,

try this

int optionsetvalue= entityname.GetAttributeValue<OptionSetValue>("fieldname").Value;

Please mark my answer as correct if you find so.

Regards,
Abhishek

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Mahendar Pal 45,095 on at

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RE: GetAttributeValue returns null

you need to use Value as suggested because you want to get value of the option set field and in case interested for other types please refer our blog: mahenderpal.wordpress.com/.../retrieve-ms-crm-datatype-fields-using-late-bound

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Guido Preite 54,084 Moderator on at

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RE: GetAttributeValue returns null

you get null because

your plugin is on update, that optionset is not inside the updated attributes so it return null

you should use a preimage in order to get the value

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Aiden Kaskela 19,696 on at

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RE: GetAttributeValue returns null

Hi,

If you're getting a null reference exception, drilling more into the null value won't help. You should always be checking for null before accessing properties:

if (entity.Attributes.ContainsKey("asip_categorie"))

{

// Once you verify the property exists, then you can get into it further. I like to get it from the attibute collection

OptionSetValue value = (OptionSetValue)entity.Attributes["asip_categorie"];

}

If this was helpful, I'd appreciate if you would mark this as the verified answer.

Thanks Paul,

Aiden

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Community Member on at

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RE: GetAttributeValue returns null

Hi,

I tried to change the line with :

int Categorie = entity.GetAttributeValue<OptionSetValue>("asip_categorie").Value;

And i get the fallowing exception :

Unexpected exception from plug-in (Execute): [...]: System.NullReferenceException: La référence d'objet n'est pas définie à une instance d'un objet.

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Community Member on at

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RE: GetAttributeValue returns null

I changed the code as recommended :

if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)

{

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

if (entity.Attributes.ContainsKey("asip_categorie"))

{

// Once you verify the property exists, then you can get into it further. I like to get it from the attibute collection

OptionSetValue Categorie =(OptionSetValue)entity.Attributes["asip_categorie"];

} else

{

throw new InvalidPluginExecutionException("Key asip_categorie missing.");

}

When i execute the plugin by creating a new entity, i get the exception : "Key asip_categorie missing". It means that ContainsKey method return false with "asip_categorie". However, the field "asip_categorie" exists in the entity.

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Community Member on at

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RE: GetAttributeValue returns null

And "asip_categorie" has a value filled.

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Community Member on at

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RE: GetAttributeValue returns null

My plugin is on Create.

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Aiden Kaskela 19,696 on at

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RE: GetAttributeValue returns null

Hi Paul,

You need to follow Guido's suggestion about ensuring the image is passed in to the plugin, and my suggestion to check for null. You need to get it from the image so you can access the value if its set, and check for null in case its not set (because it's not always going to be).

Thanks,

Aiden

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Aiden Kaskela 19,696 on at

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RE: GetAttributeValue returns null

Get the entity from context.PreEntityImages or context.PostEntityImages

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