/// <summary>
/// 初始化 MessageContext 类的新实例。
/// </summary>
protected MessageContext(MessageInfo messageInfo)
{
if (messageInfo == null)
{
throw new ArgumentNullException("messageInfo");
}
this.messageInfo = messageInfo;
}
internal PipeMessageContext(DataReceivedEventArgs eventArgs, MessageInfo messageInfo) : base(messageInfo)
{
if (eventArgs == null)
{
throw new ArgumentNullException("eventArgs");
}
this.eventArgs = eventArgs;
}
internal FileMessageContext(string fileName, MessageInfo messageInfo)
: base(messageInfo)
{
if (String.IsNullOrEmpty(fileName))
{
throw new ArgumentNullOrEmptyException("fileName");
}
this.fileName = fileName;
}
/// <summary>
/// 从指定的 DataReceivedEventArgs 和 Message 创建 IMessageContext 的实例。
/// </summary>
/// <param name="eventArgs">要从其创建 IMessageContext 实例的 DataReceivedEventArgs 对象。</param>
/// <param name="messageInfo">要从其创建 IMessageContext 实例的 MessageInfo 对象。</param>
/// <returns>MessageContext 实例。</returns>
public static MessageContext CreateFrom(DataReceivedEventArgs eventArgs, MessageInfo messageInfo)
{
return new PipeMessageContext(eventArgs, messageInfo);
}
/// <summary>
/// 从指定的消息文件创建 IMessageContext 的实例。
/// </summary>
/// <param name="fileName">要从其创建 IMessageContext 实例的消息文件的路径。</param>
/// <param name="messageInfo">要从其创建 IMessageContext 实例的 MessageInfo 对象。</param>
/// <returns>MessageContext 实例。</returns>
public static MessageContext CreateFrom(string fileName, MessageInfo messageInfo)
{
return new FileMessageContext(fileName, messageInfo);
}