Type.GetDefaultMembers 方法

public:
 virtual cli::array <System::Reflection::MemberInfo ^> ^ GetDefaultMembers();

[System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembers(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicConstructors | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicEvents | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicFields | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicMethods | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicNestedTypes | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicProperties)]
public virtual System.Reflection.MemberInfo[] GetDefaultMembers();

public virtual System.Reflection.MemberInfo[] GetDefaultMembers();

[<System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembers(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicConstructors | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicEvents | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicFields | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicMethods | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicNestedTypes | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicProperties)>]
abstract member GetDefaultMembers : unit -> System.Reflection.MemberInfo[]
override this.GetDefaultMembers : unit -> System.Reflection.MemberInfo[]

abstract member GetDefaultMembers : unit -> System.Reflection.MemberInfo[]
override this.GetDefaultMembers : unit -> System.Reflection.MemberInfo[]

Public Overridable Function GetDefaultMembers () As MemberInfo()

返回

表示当前MemberInfo所有默认成员的对象数组Type。

-或-

如果当前MemberInfo没有默认成员，则为一Type个空数组。

实现

属性

DynamicallyAccessedMembersAttribute

示例

以下示例获取默认成员信息 MyClass 并显示默认成员。

using System;
using System.Reflection;
using System.IO;

[DefaultMemberAttribute("Age")]
public class MyClass
{
    public void Name(String s) {}
    public int Age
    {
        get
        {
            return 20;
        }
    }
    public static void Main()
    {
        try
        {
            Type  myType = typeof(MyClass);
            MemberInfo[] memberInfoArray = myType.GetDefaultMembers();
            if (memberInfoArray.Length > 0)
            {
                foreach(MemberInfo memberInfoObj in memberInfoArray)
                {
                    Console.WriteLine("The default member name is: " + memberInfoObj.ToString());
                }
            }
            else
            {
                Console.WriteLine("No default members are available.");
            }
        }
        catch(InvalidOperationException e)
        {
            Console.WriteLine("InvalidOperationException: " + e.Message);
        }
        catch(IOException e)
        {
            Console.WriteLine("IOException: " + e.Message);
        }
        catch(Exception e)
        {
            Console.WriteLine("Exception: " + e.Message);
        }
    }
}

open System
open System.Reflection
open System.IO

[<DefaultMemberAttribute "Age">]
type MyClass() =
    member _.Name(s: string) = ()
    member _.Age 
        with get () =
            20
try
    let myType = typeof<MyClass>
    let memberInfoArray = myType.GetDefaultMembers()
    if memberInfoArray.Length > 0 then
        for memberInfoObj in memberInfoArray do
            printfn $"The default member name is: {memberInfoObj}"
    else
        printfn "No default members are available."
with
| :? InvalidOperationException as e ->
    printfn $"InvalidOperationException: {e.Message}"
| :? IOException as e ->
    printfn $"IOException: {e.Message}"
| e ->
    printfn $"Exception: {e.Message}"

Imports System.Reflection
Imports System.IO

<DefaultMemberAttribute("Age")> Public Class [MyClass]

    Public Sub Name(ByVal s As String)
    End Sub

    Public ReadOnly Property Age() As Integer
        Get
            Return 20
        End Get
    End Property

    Public Shared Sub Main()
        Try
            Dim myType As Type = GetType([MyClass])
            Dim memberInfoArray As MemberInfo() = myType.GetDefaultMembers()
            If memberInfoArray.Length > 0 Then
                Dim memberInfoObj As MemberInfo
                For Each memberInfoObj In memberInfoArray
                    Console.WriteLine("The default member name is: " + memberInfoObj.ToString())
                Next memberInfoObj
            Else
                Console.WriteLine("No default members are available.")
            End If
        Catch e As InvalidOperationException
            Console.WriteLine("InvalidOperationException: " + e.Message)
        Catch e As IOException
            Console.WriteLine("IOException: " + e.Message)
        Catch e As Exception
            Console.WriteLine("Exception: " + e.Message)
        End Try
    End Sub
End Class

注解

该方法 GetDefaultMembers 不按特定顺序返回成员，如字母顺序或声明顺序。 您的代码不得依赖于返回成员的顺序，因为该顺序会有所不同。

此方法可由派生类重写。

成员包括属性、方法、字段、事件等。

下表显示了通过 Get 方法在反射类型时返回的基类成员。

1. 按名称和签名隐藏会考虑签名的所有部分，包括自定义修饰符、返回类型、参数类型、sentinel 和非托管调用约定。 这是二进制比较。

2. 对于反射，属性和事件通过名称和签名进行隐藏。 如果基类中同时具有 get 和 set 访问器的属性，但派生类只有 get 访问器，则派生类属性将隐藏基类属性，并且无法访问基类上的 setter。

3. 自定义属性不是常见类型系统的一部分。

如果当前 Type 表示构造的泛型类型，此方法将返回 MemberInfo 具有由相应类型参数替换的类型参数的对象。 例如，如果类 C<T> 具有返回 P 的属性 T，则对 GetDefaultMembers 调用 C<int> 返回 C# 中的 int P （Visual Basic 中的 Property P As Integer）。

如果当前 Type 表示泛型类型或泛型方法定义中的类型参数，则此方法将搜索类约束的成员，或者不存在类约束的成员 Object 。

另请参阅

• MemberInfo
• DefaultMemberAttribute
• GetMember(String)
• GetMembers()
• FindMembers(MemberTypes, BindingFlags, MemberFilter, Object)