private BindingContext(IHtmlContainer scope, string name, BindingContextExitBehavior exitBehavior)
{
_scope = scope;
_name = name;
_thread = Thread.CurrentThread;
_exitBehavior = exitBehavior;
}
/// <summary>
/// 创建并进入一个绑定上下文
/// </summary>
/// <param name="name">上下文友好的名称，用于Trace识别</param>
/// <param name="exitBehavior">退出上下文时的行为</param>
/// <returns></returns>
public static BindingContext Enter(string name, BindingContextExitBehavior exitBehavior)
{
var currentContext = Current;
if (currentContext == null)
{
throw new InvalidOperationException();
}
return(Enter(currentContext.Scope, name, exitBehavior));
}
/// <summary>
/// 进入上下文
/// </summary>
protected void EnterCore(BindingContextExitBehavior behavior)
{
var currentContext = Current;
if (currentContext != null)
{
currentContext.VerifyAccess(); //进入上下文时，也要检查先前的上下文是否同一线程。
currentContext.Commit(); //强行提交先前的上下文。
this.AboveContext = currentContext;
currentContext.FollowContext = this;
}
Current = this;
Trace.Write("Binding", string.Format("Enter BindingContext \"{0}\"", Name));
}
/// <summary>
/// 创建并进入一个绑定上下文
/// </summary>
/// <param name="scope">绑定范围，超出此范围的绑定都不会被提交</param>
/// <param name="name">上下文友好的名称，用于Trace识别</param>
/// <param name="exitBehavior">退出上下文时的行为</param>
/// <returns></returns>
public static BindingContext Enter(IHtmlContainer scope, string name, BindingContextExitBehavior exitBehavior)
{
var currentContext = Current;
if (currentContext != null)
{
currentContext.VerifyAccess();
}
if (currentContext != null &&
!currentContext.Scope.Equals(scope) &&
!currentContext.Scope.DescendantNodes().OfType <IHtmlContainer>().Contains(scope)
)
{
throw new InvalidOperationException();
}
var context = new BindingContext(scope, name, exitBehavior);
context.EnterCore(exitBehavior);
return(context);
}
