ComplexType Klasse

Definition

public ref class ComplexType : System::Data::Metadata::Edm::StructuralType

public class ComplexType : System.Data.Metadata.Edm.StructuralType

type ComplexType = class
    inherit StructuralType

Public Class ComplexType
Inherits StructuralType

Vererbung

Object

MetadataItem

GlobalItem

EdmType

StructuralType

ComplexType

Beispiele

Das folgende Codebeispiel ruft einen Metadatenarbeitsbereich aus der Verbindung ab und verwendet diesen Metadatenarbeitsbereich, um Informationen zu den Eigenschaften der komplexen Typen im angegebenen Modell abzurufen. Beachten Sie, dass der Metadatenarbeitsbereich eine Laufzeitdienstkomponente ist, die Unterstützung für das Abrufen von Metadaten bietet.

Im Codebeispiel wird ein CSpace Modell zum Angeben des Modells verwendet. Dies CSpace stellt den Standardnamen für das konzeptionelle Modell dar. Im Codebeispiel wird das CustomerComplexAddr-Modell verwendet, das unter How to: Define a Model with Complex Types (Entity Framework) thema bereitgestellt wird.

using System;  
using System.Data;  
using System.Collections.ObjectModel;  
using System.Data.EntityClient;  
using System.Data.Metadata.Edm;  

class GetComplexTypeMembersExample  
{  
  static void Main()  
  {  
    try  
    {  
      // Establish a connection to the underlying data provider by   
      // using the connection string specified in the config file.  
      using (EntityConnection connection =  
        new EntityConnection("Name=CustomerWComplexAddrEntities"))  
      {  
         // Open the connection.  
         connection.Open();  

         // Access the metadata workspace.  
         MetadataWorkspace workspace =   
            connection.GetMetadataWorkspace();  

         // Get properties of complex types.  
         GetProperties(workspace, DataSpace.CSpace);  
      }  
    }  
    catch (MetadataException exceptionMetadata)  
    {  
       Console.WriteLine("MetadataException: {0}",  
              exceptionMetadata.Message);  
    }  
    catch (System.Data.MappingException exceptionMapping)  
    {  
       Console.WriteLine("MappingException: {0}",  
               exceptionMapping.Message);  
    }  
  }  

  public static void GetProperties(MetadataWorkspace workspace,   
      DataSpace model)  
  {  
    // Get a collection of complex types.  
    ReadOnlyCollection<ComplexType> complexTypes =  
       workspace.GetItems<ComplexType>(model);  

    // Iterate through the collection to get each complex type.  
    foreach (ComplexType complexType in complexTypes)  
    {  
       Console.WriteLine(  
         "\n\n***ComplexType Name: {0}, Namespace: {1}",  
         complexType.Name,  
         complexType.NamespaceName);  

       Console.WriteLine(  
          "\nGet the properties of this " +  
          "ComplexType object ==>");  
          // Iterate through the collection to get each property of the   
          // current ComplexType object.  
          foreach (EdmProperty property in complexType.Properties)  
          {  
            Console.Write("   Property Name: {0} ", property.Name);  

            Console.WriteLine(  
               "   Property declaring Type: {0}, edmtype: {1}," +  
               " default: {2}, nullable: {3} ",  
               property.DeclaringType, property.TypeUsage.EdmType,  
               property.Default, property.Nullable);  
          }  
      }  
  }  
}  

Imports System  
Imports System.Collections.ObjectModel  
Imports System.Data  
Imports System.Data.EntityClient  
Imports System.Data.Metadata.Edm  

Class GetComplexTypeMembersExample  
  Public Shared Sub Main()  
    Try  
      ' Establish a connection to the underlying data provider by   
      ' using the connection string specified in the config file.  
      Using connection As EntityConnection = _  
         New EntityConnection("Name=CustomerWComplexAddrEntities")  

         ' Open the connection.  
         connection.Open()  

         ' Access the metadata workspace.  
         Dim workspace As MetadataWorkspace = _  
            connection.GetMetadataWorkspace  

         ' Get properties of complex types.  
         GetProperties(workspace, DataSpace.CSpace)  
      End Using  
    Catch exceptionMetadata As MetadataException  
       Console.WriteLine("MetadataException: {0}", _  
           exceptionMetadata.Message)  
    Catch exceptionMapping As MappingException  
       Console.WriteLine("MappingException: {0}", _  
           exceptionMapping.Message)  
     End Try  
  End Sub  

  Public Shared Sub GetProperties( _  
    ByVal workspace As MetadataWorkspace, ByVal model As DataSpace)  

    ' Get a collection of complex types.  
    Dim complexTypes As ReadOnlyCollection(Of ComplexType) = _  
       workspace.GetItems(Of ComplexType)(model)  

    ' Iterate through the collection to get each complex type.  
    Dim complexType As ComplexType  
    For Each complexType In complexTypes  
       Console.WriteLine( _  
          ControlChars.Lf & ControlChars.Lf & _  
          "***ComplexType Name: {0}, Namespace: {1}", _  
          complexType.Name, complexType.NamespaceName)  

       Console.WriteLine(ControlChars.Lf & _  
          "Get the properties of this ComplexType object ==>")  

          ' Iterate through the collection to get each property of the   
          ' current ComplexType object.  
          Dim property1 As EdmProperty  
          For Each property1 In complexType.Properties  
            Console.Write("   Property Name: {0} ", property1.Name)  
            Console.WriteLine( _  
              "   Property declaring Type: {0}, edmtype: {1}, " + _  
              "default: {2}, nullable: {3} ", _  
              New Object() {property1.DeclaringType, _  
              property1.TypeUsage.EdmType, _  
              property1.Default, property1.Nullable})  
          Next  
        Next  
    End Sub  
End Class  

Hinweise

Das ComplexType konzeptuelle Modell stellt einen Typ dar, der eine Reihe von Eigenschaften wie einen Entitätstyp enthält, aber keine Schlüsseleigenschaft enthält. Weitere Informationen zu den komplexen Typen in einem konzeptionellen Modell finden Sie unter "Komplexer Typ " und "How to: Define a Model with Complex Types (Entity Framework)".