ArgumentNullException 類別

定義

例外狀況,這個例外狀況會在 Null 參考 (在 Visual Basic 中為 Nothing) 被傳遞至不接受其為有效引數的方法時擲回。The exception that is thrown when a null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.

public ref class ArgumentNullException : ArgumentException
[System.Runtime.InteropServices.ComVisible(true)]
[System.Serializable]
public class ArgumentNullException : ArgumentException
type ArgumentNullException = class
    inherit ArgumentException
Public Class ArgumentNullException
Inherits ArgumentException
繼承
屬性

備註

當叫用方法, 而且至少有一個傳遞的引數是null , 但絕對不應為null時, 就會擲回例外狀況(exception)。ArgumentNullExceptionAn ArgumentNullException exception is thrown when a method is invoked and at least one of the passed arguments is null but should never be null.

在下列兩個主要情況下, 會在執行時間擲回例外狀況,兩者都反映開發人員錯誤:ArgumentNullExceptionAn ArgumentNullException exception is thrown at run time in the following two major circumstances, both of which reflect developer error:

  • 未具現化的物件會傳遞至方法。An uninstantiated object is passed to a method. 若要避免此錯誤, 請具現化物件。To prevent the error, instantiate the object.

  • 然後, 從方法呼叫傳回的物件會當做引數傳遞給第二個方法, 但原始傳回物件的值是nullAn object returned from a method call is then passed as an argument to a second method, but the value of the original returned object is null. 若要避免此錯誤, 請檢查傳回值是否null為, 並只有在傳回值不null是時才呼叫第二個方法。To prevent the error, check for a return value that is null and call the second method only if the return value is not null.

ArgumentNullException 的行為與 ArgumentException 相同。ArgumentNullException behaves identically to ArgumentException. 它會提供, 讓應用程式程式碼可以區分引數null所造成的例外狀況, 以及非 null 引數所造成的例外狀況。It is provided so that application code can differentiate between exceptions caused by null arguments and exceptions caused by arguments that are not null. 如需非 null 引數所造成的錯誤,請參閱ArgumentOutOfRangeExceptionFor errors caused by arguments that are not null, see ArgumentOutOfRangeException.

ArgumentNullException使用 HRESULT E_POINTER, 其值為且顯示0x80004003。ArgumentNullException uses the HRESULT E_POINTER, which has the value 0x80004003.

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

建構函式

ArgumentNullException()

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

ArgumentNullException(SerializationInfo, StreamingContext)

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

ArgumentNullException(String)

使用造成這個例外狀況的參數名稱來初始化 ArgumentNullException 類別的新執行個體。Initializes a new instance of the ArgumentNullException class with the name of the parameter that causes this exception.

ArgumentNullException(String, Exception)

使用指定的錯誤訊息和造成這個例外狀況的例外狀況,初始化 ArgumentNullException 類別的新執行個體。Initializes a new instance of the ArgumentNullException class with a specified error message and the exception that is the cause of this exception.

ArgumentNullException(String, String)

使用指定的錯誤訊息和造成這個例外狀況的參數名稱來初始化 ArgumentNullException 類別的執行個體。Initializes an instance of the ArgumentNullException class with a specified error message and the name of the parameter that causes this exception.

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

取得錯誤訊息和參數名稱,或如果參數名稱未設定時只取得錯誤訊息。Gets the error message and the parameter name, or only the error message if no parameter name is set.

(繼承來源 ArgumentException)
ParamName

取得造成這個例外狀況的參數名稱。Gets the name of the parameter that causes this exception.

(繼承來源 ArgumentException)
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()

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

(繼承來源 Object)
GetObjectData(SerializationInfo, StreamingContext)

以參數名稱和其他例外狀況資訊設定 SerializationInfo 物件。Sets the SerializationInfo object with the parameter name and additional exception information.

(繼承來源 ArgumentException)
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 的淺層複本 (Shallow Copy)。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

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