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#if !(_WINDOWS_CE) && !(_SILVERLIGHT) && !(WINDOWS_PHONE)
using System;
using System.Diagnostics;
using System.Threading;
using System.Reflection;
using System.Web;
using System.Runtime.Remoting.Messaging;
namespace Amib.Threading.Internal
{
#region CallerThreadContext class
/// <summary>
/// This class stores the caller call context in order to restore
/// it when the work item is executed in the thread pool environment.
/// </summary>
internal class CallerThreadContext
{
#region Prepare reflection information
// Cached type information.
private static readonly MethodInfo getLogicalCallContextMethodInfo =
typeof(Thread).GetMethod("GetLogicalCallContext", BindingFlags.Instance | BindingFlags.NonPublic);
private static readonly MethodInfo setLogicalCallContextMethodInfo =
typeof(Thread).GetMethod("SetLogicalCallContext", BindingFlags.Instance | BindingFlags.NonPublic);
private static string HttpContextSlotName = GetHttpContextSlotName();
private static string GetHttpContextSlotName()
{
FieldInfo fi = typeof(HttpContext).GetField("CallContextSlotName", BindingFlags.Static | BindingFlags.NonPublic);
if (fi != null)
{
return (string) fi.GetValue(null);
}
return "HttpContext";
}
#endregion
#region Private fields
private HttpContext _httpContext;
private LogicalCallContext _callContext;
#endregion
/// <summary>
/// Constructor
/// </summary>
private CallerThreadContext()
{
}
public bool CapturedCallContext
{
get
{
return (null != _callContext);
}
}
public bool CapturedHttpContext
{
get
{
return (null != _httpContext);
}
}
/// <summary>
/// Captures the current thread context
/// </summary>
/// <returns></returns>
public static CallerThreadContext Capture(
bool captureCallContext,
bool captureHttpContext)
{
Debug.Assert(captureCallContext || captureHttpContext);
CallerThreadContext callerThreadContext = new CallerThreadContext();
// TODO: In NET 2.0, redo using the new feature of ExecutionContext class - Capture()
// Capture Call Context
if(captureCallContext && (getLogicalCallContextMethodInfo != null))
{
callerThreadContext._callContext = (LogicalCallContext)getLogicalCallContextMethodInfo.Invoke(Thread.CurrentThread, null);
if (callerThreadContext._callContext != null)
{
callerThreadContext._callContext = (LogicalCallContext)callerThreadContext._callContext.Clone();
}
}
// Capture httpContext
if (captureHttpContext && (null != HttpContext.Current))
{
callerThreadContext._httpContext = HttpContext.Current;
}
return callerThreadContext;
}
/// <summary>
/// Applies the thread context stored earlier
/// </summary>
/// <param name="callerThreadContext"></param>
public static void Apply(CallerThreadContext callerThreadContext)
{
if (null == callerThreadContext)
{
throw new ArgumentNullException("callerThreadContext");
}
// Todo: In NET 2.0, redo using the new feature of ExecutionContext class - Run()
// Restore call context
if ((callerThreadContext._callContext != null) && (setLogicalCallContextMethodInfo != null))
{
setLogicalCallContextMethodInfo.Invoke(Thread.CurrentThread, new object[] { callerThreadContext._callContext });
}
// Restore HttpContext
if (callerThreadContext._httpContext != null)
{
HttpContext.Current = callerThreadContext._httpContext;
//CallContext.SetData(HttpContextSlotName, callerThreadContext._httpContext);
}
}
}
#endregion
}
#endif
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