ChangeConflictException 类
定义
客户端最后一次读取数据库值后,由于这些值已被更新而导致更新失败时引发。Thrown when an update fails because database values have been updated since the client last read them.
public ref class ChangeConflictException : Exception
public class ChangeConflictException : Exception
type ChangeConflictException = class
inherit Exception
Public Class ChangeConflictException
Inherits Exception
- 继承
示例
Northwnd db = new Northwnd("...");
try
{
db.SubmitChanges(ConflictMode.ContinueOnConflict);
}
catch (ChangeConflictException e)
{
Console.WriteLine("Optimistic concurrency error.");
Console.WriteLine(e.Message);
foreach (ObjectChangeConflict occ in db.ChangeConflicts)
{
MetaTable metatable = db.Mapping.GetTable(occ.Object.GetType());
Customer entityInConflict = (Customer)occ.Object;
Console.WriteLine("Table name: {0}", metatable.TableName);
Console.Write("Customer ID: ");
Console.WriteLine(entityInConflict.CustomerID);
Console.ReadLine();
}
}
Dim db As New Northwnd("...")
Try
db.SubmitChanges(ConflictMode.ContinueOnConflict)
Catch ex As ChangeConflictException
Console.WriteLine("Optimistic concurrency error.")
Console.WriteLine(ex.Message)
For Each occ As ObjectChangeConflict In db.ChangeConflicts
Dim metatable As MetaTable = db.Mapping.GetTable(occ.Object.GetType())
Dim entityInConflict = occ.Object
Console.WriteLine("Table name: " & metatable.TableName)
Console.Write("Customer ID: ")
Console.WriteLine(entityInConflict.CustomerID)
Console.ReadLine()
Next
End Try
注解
下面的示例演示如何使用此异常来返回有关并发冲突的信息。The following example shows how this exception might be used for returning information about a concurrency conflict.
构造函数
| ChangeConflictException() |
初始化 ChangeConflictException 类的新实例。Initializes a new instance of the ChangeConflictException class. |
| ChangeConflictException(String) |
初始化 ChangeConflictException 类的新实例,并指定用于说明异常的消息。Initializes a new instance of the ChangeConflictException class and specifies a message to explain the exception. |
| ChangeConflictException(String, Exception) |
初始化 ChangeConflictException 类的新实例,指定用于说明异常的消息以及导致此异常的异常。Initializes a new instance of the ChangeConflictException class, specifies a message to explain the exception, and specifies the exception that caused this exception. |
属性
| Data |
获取键/值对的集合,这些键/值对提供有关该异常的其他用户定义信息。Gets a collection of key/value pairs that provide additional user-defined information about the exception. (继承自 Exception) |
| HelpLink |
获取或设置指向与此异常关联的帮助文件链接。Gets or sets a link to the help file associated with this exception. (继承自 Exception) |
| HResult |
获取或设置 HRESULT(一个分配给特定异常的编码数字值)。Gets or sets HRESULT, a coded numerical value that is assigned to a specific exception. (继承自 Exception) |
| InnerException |
获取导致当前异常的 Exception 实例。Gets the Exception instance that caused the current exception. (继承自 Exception) |
| Message |
获取描述当前异常的消息。Gets a message that describes the current exception. (继承自 Exception) |
| Source |
获取或设置导致错误的应用程序或对象的名称。Gets or sets the name of the application or the object that causes the error. (继承自 Exception) |
| StackTrace |
获取调用堆栈上的即时框架字符串表示形式。Gets a string representation of the immediate frames on the call stack. (继承自 Exception) |
| TargetSite |
获取引发当前异常的方法。Gets the method that throws the current exception. (继承自 Exception) |
方法
| Equals(Object) |
确定指定对象是否等于当前对象。Determines whether the specified object is equal to the current object. (继承自 Object) |
| GetBaseException() |
当在派生类中重写时,返回 Exception,它是一个或多个并发的异常的根本原因。When overridden in a derived class, returns the Exception that is the root cause of one or more subsequent exceptions. (继承自 Exception) |
| GetHashCode() |
作为默认哈希函数。Serves as the default hash function. (继承自 Object) |
| GetObjectData(SerializationInfo, StreamingContext) |
当在派生类中重写时,用关于异常的信息设置 SerializationInfo。When overridden in a derived class, sets the SerializationInfo with information about the exception. (继承自 Exception) |
| GetType() |
获取当前实例的运行时类型。Gets the runtime type of the current instance. (继承自 Exception) |
| MemberwiseClone() |
创建当前 Object 的浅表副本。Creates a shallow copy of the current Object. (继承自 Object) |
| ToString() |
创建并返回当前异常的字符串表示形式。Creates and returns a string representation of the current exception. (继承自 Exception) |
事件
| SerializeObjectState |
当异常被序列化用来创建包含有关该异常的徐列出数据的异常状态对象时会出现该问题。Occurs when an exception is serialized to create an exception state object that contains serialized data about the exception. (继承自 Exception) |