MissingMemberException MissingMemberException MissingMemberException MissingMemberException Class

定義

嘗試動態存取不存在或未宣告為公開的類別成員時,所擲回的例外狀況。The exception that is thrown when there is an attempt to dynamically access a class member that does not exist or that is not declared as public. 如果移除或重新命名類別庫 (Class Library) 中的成員,請重新編譯參考該類別庫的任何組件。If a member in a class library has been removed or renamed, recompile any assemblies that reference that library.

public ref class MissingMemberException : MemberAccessException
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class MissingMemberException : MemberAccessException
type MissingMemberException = class
    inherit MemberAccessException
    interface ISerializable
Public Class MissingMemberException
Inherits MemberAccessException
繼承
衍生
屬性
實作

範例

這個範例會顯示當您嘗試使用反映來呼叫不存在的方法, 並存取不存在的欄位時, 會發生什麼情況。This example shows what happens if you attempt to use reflection to call a method that does not exist and access a field that does not exist. 應用程式會藉由捕捉MissingMethodExceptionMissingFieldExceptionMissingMemberException來復原。The application recovers by catching the MissingMethodException, MissingFieldException, and MissingMemberException.

using namespace System;
using namespace System::Reflection;

ref class App
{
};

int main()
{
    try
    {
        // Attempt to call a static DoSomething method defined in the App class.
        // However, because the App class does not define this method,
        // a MissingMethodException is thrown.
        App::typeid->InvokeMember("DoSomething", BindingFlags::Static |
            BindingFlags::InvokeMethod, nullptr, nullptr, nullptr);
    }
    catch (MissingMethodException^ ex)
    {
        // Show the user that the DoSomething method cannot be called.
        Console::WriteLine("Unable to call the DoSomething method: {0}",
            ex->Message);
    }

    try
    {
        // Attempt to access a static AField field defined in the App class.
        // However, because the App class does not define this field,
        // a MissingFieldException is thrown.
        App::typeid->InvokeMember("AField", BindingFlags::Static |
            BindingFlags::SetField, nullptr, nullptr, gcnew array<Object^>{5});
    }
    catch (MissingFieldException^ ex)
    {
        // Show the user that the AField field cannot be accessed.
        Console::WriteLine("Unable to access the AField field: {0}",
            ex->Message);
    }

    try
    {
        // Attempt to access a static AnotherField field defined in the App class.
        // However, because the App class does not define this field,
        // a MissingFieldException is thrown.
        App::typeid->InvokeMember("AnotherField", BindingFlags::Static |
            BindingFlags::GetField, nullptr, nullptr, nullptr);
    }
    catch (MissingMemberException^ ex)
    {
        // Notice that this code is catching MissingMemberException which is the
        // base class of MissingMethodException and MissingFieldException.
        // Show the user that the AnotherField field cannot be accessed.
        Console::WriteLine("Unable to access the AnotherField field: {0}",
            ex->Message);
    }
}
// This code produces the following output.
//
// Unable to call the DoSomething method: Method 'App.DoSomething' not found.
// Unable to access the AField field: Field 'App.AField' not found.
// Unable to access the AnotherField field: Field 'App.AnotherField' not found.
using System;
using System.Reflection;

public class App
{
    public static void Main()
    {

        try
        {
            // Attempt to call a static DoSomething method defined in the App class.
            // However, because the App class does not define this method,
            // a MissingMethodException is thrown.
            typeof(App).InvokeMember("DoSomething", BindingFlags.Static |
                BindingFlags.InvokeMethod, null, null, null);
        }
        catch (MissingMethodException e)
        {
            // Show the user that the DoSomething method cannot be called.
            Console.WriteLine("Unable to call the DoSomething method: {0}", e.Message);
        }

        try
        {
            // Attempt to access a static AField field defined in the App class.
            // However, because the App class does not define this field,
            // a MissingFieldException is thrown.
            typeof(App).InvokeMember("AField", BindingFlags.Static | BindingFlags.SetField,
                null, null, new Object[] { 5 });
        }
        catch (MissingFieldException e)
        {
         // Show the user that the AField field cannot be accessed.
         Console.WriteLine("Unable to access the AField field: {0}", e.Message);
        }

        try
        {
            // Attempt to access a static AnotherField field defined in the App class.
            // However, because the App class does not define this field,
            // a MissingFieldException is thrown.
            typeof(App).InvokeMember("AnotherField", BindingFlags.Static |
                BindingFlags.GetField, null, null, null);
        }
        catch (MissingMemberException e)
        {
         // Notice that this code is catching MissingMemberException which is the
         // base class of MissingMethodException and MissingFieldException.
         // Show the user that the AnotherField field cannot be accessed.
         Console.WriteLine("Unable to access the AnotherField field: {0}", e.Message);
        }
    }
}
// This code example produces the following output:
//
// Unable to call the DoSomething method: Method 'App.DoSomething' not found.
// Unable to access the AField field: Field 'App.AField' not found.
// Unable to access the AnotherField field: Field 'App.AnotherField' not found.
Imports System
Imports System.Reflection

Public Class App
    Public Shared Sub Main() 
        Try
            ' Attempt to call a static DoSomething method defined in the App class.
            ' However, because the App class does not define this method, 
            ' a MissingMethodException is thrown.
            GetType(App).InvokeMember("DoSomething", BindingFlags.Static Or BindingFlags.InvokeMethod, _
                                       Nothing, Nothing, Nothing)
        Catch e As MissingMethodException
            ' Show the user that the DoSomething method cannot be called.
            Console.WriteLine("Unable to call the DoSomething method: {0}", e.Message)
        End Try
        Try
            ' Attempt to access a static AField field defined in the App class.
            ' However, because the App class does not define this field, 
            ' a MissingFieldException is thrown.
            GetType(App).InvokeMember("AField", BindingFlags.Static Or BindingFlags.SetField, _
                                       Nothing, Nothing, New [Object]() {5})
        Catch e As MissingFieldException
            ' Show the user that the AField field cannot be accessed.
            Console.WriteLine("Unable to access the AField field: {0}", e.Message)
        End Try
        Try
            ' Attempt to access a static AnotherField field defined in the App class.
            ' However, because the App class does not define this field, 
            ' a MissingFieldException is thrown.
            GetType(App).InvokeMember("AnotherField", BindingFlags.Static Or BindingFlags.GetField, _
                                       Nothing, Nothing, Nothing)
        Catch e As MissingMemberException
            ' Notice that this code is catching MissingMemberException which is the  
            ' base class of MissingMethodException and MissingFieldException.
            ' Show the user that the AnotherField field cannot be accessed.
            Console.WriteLine("Unable to access the AnotherField field: {0}", e.Message)
        End Try
    End Sub 
End Class 
' This code example produces the following output:
'
' Unable to call the DoSomething method: Method 'App.DoSomething' not found.
' Unable to access the AField field: Field 'App.AField' not found.
' Unable to access the AnotherField field: Field 'App.AnotherField' not found.

備註

一般來說, 如果程式碼嘗試存取類別的不存在成員, 就會產生編譯錯誤。Normally a compilation error is generated if the code attempts to access a nonexistent member of a class. MissingMemberException的設計目的是要處理在一個元件中刪除或重新命名欄位或方法的情況, 而且變更不會反映在第二個元件中。MissingMemberException is designed to handle cases where a field or a method is deleted or renamed in one assembly and the change is not reflected in a second assembly. 在執行時間MissingMemberException , 當第二個元件中的程式碼嘗試存取第一個元件中遺漏的成員時, 就會擲回。At runtime, MissingMemberException will be thrown when the code in the second assembly attempts to access the missing member in the first assembly.

MissingMemberExceptionMissingFieldExceptionMissingMethodException的基類。MissingMemberException is the base class for MissingFieldException and MissingMethodException. 一般來說, 最好使用的其中一個衍生類別MissingMemberException , 以更精確地指出錯誤的確切性質。In general it is better to use one of the derived classes of MissingMemberException to more precisely indicate the exact nature of the error. MissingMemberException如果您只想要捕捉遺漏成員錯誤的一般案例, 請擲回。Throw a MissingMemberException if you are only interested in capturing the general case of a missing member error.

MissingMemberException會使用具有值0x80131512 的 HRESULT COR_E_MISSINGMEMBER。MissingMemberException uses the HRESULT COR_E_MISSINGMEMBER, that has the value 0x80131512.

如需執行個體的初始屬性值的清單MissingMemberException,請參閱MissingMemberException建構函式。For a list of initial property values for an instance of MissingMemberException, see the MissingMemberException constructors.

建構函式

MissingMemberException() MissingMemberException() MissingMemberException() MissingMemberException()

初始化 MissingMemberException 類別的新執行個體。Initializes a new instance of the MissingMemberException class.

MissingMemberException(SerializationInfo, StreamingContext) MissingMemberException(SerializationInfo, StreamingContext) MissingMemberException(SerializationInfo, StreamingContext) MissingMemberException(SerializationInfo, StreamingContext)

使用序列化資料,初始化 MissingMemberException 類別的新執行個體。Initializes a new instance of the MissingMemberException class with serialized data.

MissingMemberException(String) MissingMemberException(String) MissingMemberException(String) MissingMemberException(String)

使用指定的錯誤訊息,初始化 MissingMemberException 類別的新執行個體。Initializes a new instance of the MissingMemberException class with a specified error message.

MissingMemberException(String, Exception) MissingMemberException(String, Exception) MissingMemberException(String, Exception) MissingMemberException(String, Exception)

使用指定的錯誤訊息和造成這個例外狀況根本原因的內部例外參考,初始化 MissingMemberException 類別的新執行個體。Initializes a new instance of the MissingMemberException class with a specified error message and a reference to the inner exception that is the root cause of this exception.

MissingMemberException(String, String) MissingMemberException(String, String) MissingMemberException(String, String) MissingMemberException(String, String)

使用指定的類別名稱和成員名稱,初始化 MissingMemberException 類別的新執行個體。Initializes a new instance of the MissingMemberException class with the specified class name and member name.

欄位

ClassName ClassName ClassName ClassName

保留遺漏成員的類別名稱。Holds the class name of the missing member.

MemberName MemberName MemberName MemberName

保留遺漏成員的名稱。Holds the name of the missing member.

Signature Signature Signature Signature

保留遺漏成員的簽章 (Signature)。Holds the signature of the missing member.

屬性

Data Data Data Data

取得提供例外狀況之其他使用者定義相關資訊的索引鍵/值組集合。Gets a collection of key/value pairs that provide additional user-defined information about the exception.

(Inherited from Exception)
HelpLink HelpLink HelpLink HelpLink

取得或設定與這個例外狀況相關聯的說明檔連結。Gets or sets a link to the help file associated with this exception.

(Inherited from Exception)
HResult HResult HResult HResult

取得或設定 HRESULT,它是指派給特定例外狀況的編碼數值。Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception.

(Inherited from Exception)
InnerException InnerException InnerException InnerException

取得造成目前例外狀況的 Exception 執行個體。Gets the Exception instance that caused the current exception.

(Inherited from Exception)
Message Message Message Message

取得顯示類別名稱、成員名稱和遺漏成員簽章的文字字串。Gets the text string showing the class name, the member name, and the signature of the missing member.

Source Source Source Source

取得或設定造成錯誤的應用程式或物件的名稱。Gets or sets the name of the application or the object that causes the error.

(Inherited from Exception)
StackTrace StackTrace StackTrace StackTrace

取得呼叫堆疊上即時運算框架的字串表示。Gets a string representation of the immediate frames on the call stack.

(Inherited from Exception)
TargetSite TargetSite TargetSite TargetSite

取得擲回目前例外狀況的方法。Gets the method that throws the current exception.

(Inherited from Exception)

方法

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

判斷指定的物件是否等於目前的物件。Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetBaseException() GetBaseException() GetBaseException() GetBaseException()

在衍生類別中覆寫時,傳回一或多個後續的例外狀況的根本原因 ExceptionWhen overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions.

(Inherited from Exception)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

做為預設雜湊函式。Serves as the default hash function.

(Inherited from Object)
GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext) GetObjectData(SerializationInfo, StreamingContext)

使用類別名稱、成員名稱、遺漏成員的簽章和其他例外狀況資訊,來設定 SerializationInfo 物件。Sets the SerializationInfo object with the class name, the member name, the signature of the missing member, and additional exception information.

GetType() GetType() GetType() GetType()

取得目前執行個體的執行階段類型。Gets the runtime type of the current instance.

(Inherited from Exception)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

建立目前 Object 的淺層複本 (Shallow Copy)。Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

建立並傳回目前例外狀況的字串表示。Creates and returns a string representation of the current exception.

(Inherited from Exception)

事件

SerializeObjectState SerializeObjectState SerializeObjectState SerializeObjectState

當例外狀況序列化,以建立包含例外狀況相關序列化資料的例外狀況狀態物件時,就會發生此事件。Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception.

(Inherited from Exception)

適用於

另請參閱