How to Set Default Values to Entity Fields

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Posted on by dkrishna

483

Hello,

I want to set default values in C# by nullable value in some common function which will set value based on field value otherwise it will default value as NULL. I want to set default values for GUID, Entityreference, DateTime, Optionsetvalue and String.

Please suggest how to set default values by null checking .

public object SetAttributeValue(string attributeType, object attributevalue, bool isFormattedValue )
{
object value = null;
bool IsFalse = false;

bool isAliasedValue = objEntity[attribute] is AliasedValue ? !IsFalse : IsFalse;
switch (attributeType)
{
case "EntityReference":
// Need code to set default value for entity reference where i will pass entity reference value and need to extract guid and return guid else set default guid.
break;
case "Guid":
//Need to check if AttributeValue has value otherwise set default guid if it NUll
break;
case "DateTime":
// value= Convert.ToDateTime(attributevalue) ? null : (Convert.ToDateTime(attributevalue));
value = Convert.ToDateTime(attributevalue) : Convert.ToString(attributevalue);
break;
case "OptionSetValue":
value = (Convert.ToInt32(attributevalue)) == 0 ? null : new OptionSetValue(Convert.ToInt32(attributevalue));

break;
default:
value = string.IsNullOrWhiteSpace(Convert.ToString(attributevalue)) ? null : (Convert.ToString(attributevalue));
break;
}

return value;

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dkrishna 483 on at

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RE: How to Set Default Values to Entity Fields

I want to set default value based on datatype not Null value as default. Pls suggest.

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Community Member on at

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RE: How to Set Default Values to Entity Fields

You have 2 options:

1. This is tedious process and not suggestible if you have lot many attributes. Go with business rule-set default value.

2.Register a plug-in in per validation or preoperation of Create message and set respective default values when it’s null

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dkrishna 483 on at

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RE: How to Set Default Values to Entity Fields

Iam creating webapi so i need to use this function.

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Aric Levin - MVP 30,190 Moderator on at

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RE: How to Set Default Values to Entity Fields

I think the following will work for EntityReference:

value = ((EntityReference)attributevalue).Id;

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dkrishna 483 on at

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RE: How to Set Default Values to Entity Fields

Thanka Aric.. How to check attributevalue with null and set default value. If you see default type in above code i have set for string by checking null. Pls suggest if you know for datetime.

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RaviKashyap 55,410 Moderator on at

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RE: How to Set Default Values to Entity Fields

Hi Krishna,

You can have a top level check for null. This below code -

============

public object SetAttributeValue(Entity objEntity, string attributeName)

{

if (objEntity != null && !string.IsNullOrEmpty(attributeName) && objEntity.Contains(attributeName))

{

return objEntity[attributeName];

}

else

{

return null;

}

}

==============

Hope this helps.

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Aric Levin - MVP 30,190 Moderator on at

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RE: How to Set Default Values to Entity Fields

Just add

if (attributeValue != null)

{

// Add logic here

}

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dkrishna 483 on at

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RE: How to Set Default Values to Entity Fields

Here i will pass only Value of Attribute and Datatype so based on Datatype passed i need to check null and set default value from common function.

iam trying like this

case "EntityReference":

if (attributevalue!=null)

{

value = ((EntityReference)attributevalue).Id;

}

else

{

value = Guid.Empty;

}

break;

is this correct ?

Pls suggest in same way how to check if AttributeValue is Guid and set deafult value as Guid.Empty if it is NULL.

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dkrishna 483 on at

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RE: How to Set Default Values to Entity Fields

Thanks Aric . For DateTime iam doing like this is this correct ?

value = attributevalue != null ? attributevalue : (Nullable<DateTime>)null;

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dkrishna 483 on at

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RE: How to Set Default Values to Entity Fields

For GUID iam handling like this

value = string.IsNullOrWhiteSpace(Convert.ToString(attributevalue)) ? Guid.Empty : ((Guid)(attributevalue));

is this correct ?

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