ComplexType 类

定义

命名空间:

System.Data.Metadata.Edm

程序集:

System.Data.Entity.dll

表示概念模型中的复杂类型。

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

继承

Object

MetadataItem

GlobalItem

EdmType

StructuralType

ComplexType

示例

下面的代码示例从连接中获取元数据工作区，并使用该元数据工作区检索有关指定模型中复杂类型的属性的信息。 请注意，元数据工作区是一个为检索元数据提供支持的运行时服务组件。

该代码示例使用 CSpace 指定模型。 CSpace 表示概念性模型的默认名称。 该代码示例使用 How to： Define a Model with Complex Types (Entity Framework 主题 中提供的 CustomerComplexAddr 模型) 。

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  

注解

ComplexType概念模型中的 表示包含一组属性（如实体类型）但不包含键属性的类型。 有关概念模型中复杂类型的详细信息，请参阅复杂类型和如何：定义具有复杂类型的模型 (实体框架) 。

属性

Abstract	获取一个值，该值指示此类型是否为抽象的。 (继承自 EdmType)
BaseType	获取此类型的基类型。 (继承自 EdmType)
BuiltInTypeKind	获取此 ComplexType 的内置类型种类。
Documentation	获取或设置与此类型关联的文档。 (继承自 MetadataItem)
FullName	获取此类型的全名。 (继承自 EdmType)
Members	获取此类型的成员列表。 (继承自 StructuralType)
MetadataProperties	获取当前类型的属性列表。 (继承自 MetadataItem)
Name	获取此类型的名称。 (继承自 EdmType)
NamespaceName	获取此类型的命名空间。 (继承自 EdmType)
Properties	获取此 ComplexType 的属性的列表。

方法

Equals(Object)	确定指定对象是否等于当前对象。 (继承自 Object)
GetCollectionType()	返回其元素类型属于此类型的 CollectionType 的实例。 (继承自 EdmType)
GetHashCode()	作为默认哈希函数。 (继承自 Object)
GetType()	获取当前实例的 Type。 (继承自 Object)
MemberwiseClone()	创建当前 Object 的浅表副本。 (继承自 Object)
ToString()	返回此类型的全名。 (继承自 EdmType)