NullReferenceException 构造函数

定义

初始化 NullReferenceException 类的新实例。Initializes a new instance of the NullReferenceException class.

重载

NullReferenceException()

初始化 NullReferenceException 类的新实例,将新实例的 Message 属性设置为系统提供的描述错误的消息,如“在需要对象实例的地方找到了值‘null’。”。Initializes a new instance of the NullReferenceException class, setting the Message property of the new instance to a system-supplied message that describes the error, such as "The value 'null' was found where an instance of an object was required." 此消息会考虑当前系统区域性。This message takes into account the current system culture.

NullReferenceException(String)

用指定的错误消息初始化 NullReferenceException 类的新实例。Initializes a new instance of the NullReferenceException class with a specified error message.

NullReferenceException(SerializationInfo, StreamingContext)

用序列化数据初始化 NullReferenceException 类的新实例。Initializes a new instance of the NullReferenceException class with serialized data.

NullReferenceException(String, Exception)

使用指定的错误消息和对作为此异常原因的内部异常的引用来初始化 NullReferenceException 类的新实例。Initializes a new instance of the NullReferenceException class with a specified error message and a reference to the inner exception that is the cause of this exception.

NullReferenceException()

初始化 NullReferenceException 类的新实例,将新实例的 Message 属性设置为系统提供的描述错误的消息,如“在需要对象实例的地方找到了值‘null’。”。Initializes a new instance of the NullReferenceException class, setting the Message property of the new instance to a system-supplied message that describes the error, such as "The value 'null' was found where an instance of an object was required." 此消息会考虑当前系统区域性。This message takes into account the current system culture.

public:
 NullReferenceException();
public NullReferenceException ();
Public Sub New ()

注解

下表显示了 NullReferenceException 实例的初始属性值。The following table shows the initial property values for an instance of NullReferenceException.

propertiesProperty Value
InnerException null.null.
Message 本地化的错误消息字符串。The localized error message string.

适用于

NullReferenceException(String)

用指定的错误消息初始化 NullReferenceException 类的新实例。Initializes a new instance of the NullReferenceException class with a specified error message.

public:
 NullReferenceException(System::String ^ message);
public NullReferenceException (string message);
new NullReferenceException : string -> NullReferenceException
Public Sub New (message As String)

参数

message
String

描述该错误的 StringA String that describes the error. message 的内容设计为易于理解。The content of message is intended to be understood by humans. 此构造函数的调用方需要确保此字符串已针对当前系统区域性进行了本地化。The caller of this constructor is required to ensure that this string has been localized for the current system culture.

注解

下表显示了 NullReferenceException 实例的初始属性值。The following table shows the initial property values for an instance of NullReferenceException.

propertiesProperty Value
InnerException null.null.
Message 错误消息字符串。The error message string.

适用于

NullReferenceException(SerializationInfo, StreamingContext)

用序列化数据初始化 NullReferenceException 类的新实例。Initializes a new instance of the NullReferenceException class with serialized data.

protected:
 NullReferenceException(System::Runtime::Serialization::SerializationInfo ^ info, System::Runtime::Serialization::StreamingContext context);
protected NullReferenceException (System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context);
new NullReferenceException : System.Runtime.Serialization.SerializationInfo * System.Runtime.Serialization.StreamingContext -> NullReferenceException
Protected Sub New (info As SerializationInfo, context As StreamingContext)

参数

info
SerializationInfo

承载序列化对象数据的对象。The object that holds the serialized object data.

context
StreamingContext

关于来源和目标的上下文信息The contextual information about the source or destination.

注解

在反序列化期间调用此构造函数以重新构造在流上传输的异常对象。This constructor is called during deserialization to reconstitute the exception object transmitted over a stream. 有关详细信息,请参阅 XML 和 SOAP 序列化For more information, see XML and SOAP Serialization.

另请参阅

适用于

NullReferenceException(String, Exception)

使用指定的错误消息和对作为此异常原因的内部异常的引用来初始化 NullReferenceException 类的新实例。Initializes a new instance of the NullReferenceException class with a specified error message and a reference to the inner exception that is the cause of this exception.

public:
 NullReferenceException(System::String ^ message, Exception ^ innerException);
public NullReferenceException (string message, Exception innerException);
new NullReferenceException : string * Exception -> NullReferenceException
Public Sub New (message As String, innerException As Exception)

参数

message
String

解释异常原因的错误消息。The error message that explains the reason for the exception.

innerException
Exception

导致当前异常的异常。The exception that is the cause of the current exception. 如果 innerException 参数不为 null,则当前异常将在处理内部异常的 catch 块中引发。If the innerException parameter is not null, the current exception is raised in a catch block that handles the inner exception.

注解

因前一个异常而直接引发的异常应在 InnerException 属性中包含对前一个异常的引用。An exception that is thrown as a direct result of a previous exception should include a reference to the previous exception in the InnerException property. InnerException 属性将返回传递给构造函数的同一值;如果 InnerException 属性不向构造函数提供内部异常值,则返回 nullThe InnerException property returns the same value that is passed into the constructor, or null if the InnerException property does not supply the inner exception value to the constructor.

下表显示了 NullReferenceException 实例的初始属性值。The following table shows the initial property values for an instance of NullReferenceException.

propertiesProperty “值”Value
InnerException 内部异常引用。The inner exception reference.
Message 错误消息字符串。The error message string.

另请参阅

适用于