Entity.GetAttributeValue<T> Method (String)

發行項
08/23/2017

Applies To: Dynamics 365 (online), Dynamics 365 (on-premises), Dynamics CRM 2016, Dynamics CRM Online

Gets the value of the attribute.

Namespace: Microsoft.Xrm.Sdk
Assembly: Microsoft.Xrm.Sdk (in Microsoft.Xrm.Sdk.dll)

Syntax

public virtual T GetAttributeValue<T>(
    string attributeLogicalName
)

Public Overridable Function GetAttributeValue(Of T) (
    attributeLogicalName As String
) As T

Parameters

attributeLogicalName
Type: System.String

Type: String. The logical name of the attribute.

Return Value

Type: T

Type: Type
The value of the attribute.

Type Parameters

T
Type: Type. The type of the attribute.

Remarks

You should only use this method for attributes you know were requested in the query that retrieved the entity. You can use Entity.Contains to check whether the entity instance includes the attribute.

When an entity instance does not include the attribute specified using the attributeLogicalName parameter this method will return null or the default value for the type rather than throw an exception. You should not assume that the entity includes the attribute. It may not be included if the code that retrieved the attribute didn’t request it.

The following table describes the default types for Dynamics Customer Engagement types which have default values:

CRM Type	.NET Type	Default Value
Two Options	Boolean	false
Whole Number	Int	0
Floating Point Number	Double	0.0
Currency	Decimal	0
Date and Time	DateTime	DateTime.MinValue(01/01/0001)

As mentioned above, getAttributeValue will return the default value rather than null for these attributes when the attribute is not requested in the query.

Examples

GetAttributeValue<EntityReference>("regardingobjectid")

共用方式為