MissingMethodException 類別

定義

當嘗試動態存取不存在的方法時,所擲回的例外狀況。The exception that is thrown when there is an attempt to dynamically access a method that does not exist.

public ref class MissingMethodException : MissingMemberException
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class MissingMethodException : MissingMemberException
type MissingMethodException = class
    inherit MissingMemberException
    interface ISerializable
Public Class MissingMethodException
Inherits MissingMemberException
繼承
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.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不存在的方法時, 就會產生編譯錯誤。Normally a compilation error is generated if code attempts to access a nonexistent method of a class. MissingMethodException的設計目的是要處理嘗試動態存取元件的已重新命名或已刪除方法, 但未被其強式名稱參考的情況。MissingMethodException is designed to handle cases where an attempt is made to dynamically access a renamed or deleted method of an assembly that is not referenced by its strong name. MissingMethodException當相依元件中的程式碼嘗試存取已修改之元件中遺漏的方法時, 就會擲回。MissingMethodException is thrown when code in a dependent assembly attempts to access a missing method in an assembly that was modified.

MissingMethodException會使用具有值0x80131513 的 HRESULT COR_E_MISSINGMETHOD。MissingMethodException uses the HRESULT COR_E_MISSINGMETHOD, that has the value 0x80131513.

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

注意

此例外狀況不會包含在適用于 Windows Store 應用程式的 .net中, 或可移植的類別庫中, 但會由的某些成員擲回。This exception is not included in .NET for Windows Store apps or the Portable Class Library, but it is thrown by some members that are. 若要在這種情況下攔截例外狀況catch , 請MissingMemberException改為撰寫的語句。To catch the exception in that case, write a catch statement for MissingMemberException instead.

建構函式

MissingMethodException()

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

MissingMethodException(SerializationInfo, StreamingContext)

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

MissingMethodException(String)

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

MissingMethodException(String, Exception)

使用指定的錯誤訊息以及造成此例外狀況的內部例外狀況的參考,初始化 MissingMethodException 類別的新執行個體。Initializes a new instance of the MissingMethodException class with a specified error message and a reference to the inner exception that is the cause of this exception.

MissingMethodException(String, String)

使用指定的類別名稱和方法名稱,初始化 MissingMethodException 類別的新執行個體。Initializes a new instance of the MissingMethodException class with the specified class name and method name.

欄位

ClassName

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

(繼承來源 MissingMemberException)
MemberName

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

(繼承來源 MissingMemberException)
Signature

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

(繼承來源 MissingMemberException)

屬性

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.

(繼承來源 Exception)
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.

(繼承來源 Exception)
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.

(繼承來源 Exception)
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.

(繼承來源 Exception)
Message

取得顯示類別名稱、方法名稱和遺漏方法簽章的文字字串。Gets the text string showing the class name, the method name, and the signature of the missing method. 這個屬性是唯讀的。This property is read-only.

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.

(繼承來源 Exception)
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.

(繼承來源 Exception)
TargetSite

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

(繼承來源 Exception)

方法

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.

(繼承來源 Object)
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.

(繼承來源 Exception)
GetHashCode()

作為預設雜湊函數。Serves as the default hash function.

(繼承來源 Object)
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.

(繼承來源 MissingMemberException)
GetType()

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

(繼承來源 Exception)
MemberwiseClone()

建立目前 Object 的淺層複製。Creates a shallow copy of the current Object.

(繼承來源 Object)
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.

(繼承來源 Exception)

事件

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.

(繼承來源 Exception)

適用於

另請參閱