EntityKey Constructor (String, IEnumerable(Of KeyValuePair(Of String, Object)))


Initializes a new instance of the EntityKey class with an entity set name and a generic T:System.Collections.Generic.KeyValuePair collection.

Namespace:   System.Data
Assembly:  System.Data.Entity (in System.Data.Entity.dll)

Public Sub New (
	qualifiedEntitySetName As String,
	entityKeyValues As IEnumerable(Of KeyValuePair(Of String, Object))


Type: System.String

A String that is the entity set name qualified by the entity container name.

Type: System.Collections.Generic.IEnumerable(Of KeyValuePair(Of String, Object))

A generic T:System.Collections.Generic.KeyValuePair collection.

Each key/value pair has a property name as the key and the value of that property as the value. There should be one pair for each property that is part of the EntityKey. The order of the key/value pairs is not important, but each key property should be included. The property names are simple names that are not qualified with an entity type name or the schema name.

This example is based on the AdventureWorks Sales Model. The example shows you how to create and use an EntityKey.

Using context As New AdventureWorksEntities()
        ' Create the key that represents the order. 
        Dim orderKey As New EntityKey("AdventureWorksEntities.SalesOrderHeaders", "SalesOrderID", orderId)

        ' Create the stand-in SalesOrderHeader object 
        ' based on the specified SalesOrderID. 
        Dim order As New SalesOrderHeader()
        order.EntityKey = orderKey

        ' Assign the ID to the SalesOrderID property to matche the key. 
        order.SalesOrderID = CInt(orderKey.EntityKeyValues(0).Value)

        ' Attach the stand-in SalesOrderHeader object. 

        ' Create a new SalesOrderDetail object. 
        ' You can use the static CreateObjectName method (the Entity Framework 
        ' adds this method to the generated entity types) instead of the new operator: 
        ' SalesOrderDetail.CreateSalesOrderDetail(1, 0, 2, 750, 1, (decimal)2171.2942, 0, 0, 
        ' Guid.NewGuid(), DateTime.Today)); 
        Dim detail = New SalesOrderDetail With
            .SalesOrderID = 0,
            .SalesOrderDetailID = 0,
            .OrderQty = 2,
            .ProductID = 750,
            .SpecialOfferID = 1,
            .UnitPrice = CDec(2171.2942),
            .UnitPriceDiscount = 0,
            .LineTotal = 0,
            .rowguid = Guid.NewGuid(),
            .ModifiedDate = DateTime.Now


    Catch generatedExceptionName As InvalidOperationException
        Console.WriteLine("Ensure that the key value matches the value of the object's ID property.")
    Catch generatedExceptionName As UpdateException
        Console.WriteLine("An error has occured. Ensure that an object with the '{0}' key value exists.", orderId)
    End Try
End Using

.NET Framework
Available since 3.5
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