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  • Are web service handler chains possible under IIS / ASP.NET

    - by Mike
    I'm working with a client who wants me to implement a particular design in an IIS/ASP.NET environment. This design was already implemented in Java, but I am not sure it is possible using Microsoft technologies. In a Tomcat/Java environment one can create so call Handler Chains. In essence a handler runs on the server on which the web service is running and it intercepts the SOAP message coming to the web service. The handler can perform a number of tasks before passing control to the web service. Some of these tasks may refer to authentication and authorization. Moreover, one can create handler chains, such that the handlers can run in a particular sequence before passing control to the web service. This is a very elegant solution, as certain aspects of authentication and authorization can be automatically performed, without the developer of the client application and of the web service having to invest anything in it. The code for the client application and the web service is not affected. You may find a number of articles on internet on this subject by searching on Google for "web service handler chain". I performed searches for web service handlers in IIS or ASP.NET. I get some hits, but apparently handlers in IIS have another meaning than that described above. My question therefor is: Can handler chains (as available in Java and Tomcat) be created in IIS? If so, how (any article, book, forum...)? Either a negative or a positive answer will be greatly appreciated. Mike

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  • Html.RenderAction<MyController> - does not have type parameters

    - by Ami
    Hi, I'm trying to use RenderAction in the following way: '<% Html.RenderAction( x = x.ControllerAction() ); %' as seen here: http://devlicio.us/blogs/derik_whittaker/archive/2008/11/24/renderpartial-vs-renderaction.aspx and here: http://eduncan911.com/blog/html-renderaction-for-asp-net-mvc-1-0.aspx but I keep getting an error about the method not having type parameters. also in MSDN I see there is no documentation for it, and also checking the MVC source code I can't find anything. I'm using the latest ASP.Net MVC (2.0 RTM) is this feature no longer available? how can I use it? thanks.

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  • IIS 6 ASP.NET default handler-mappings and virtual directories

    - by mlauter
    I'm having a problem with setting a default mapping in IIS 6. I want to secure *.HTML files with ASP.NET forms authentication. The problem seems to have something to do with using virtual directories to hold the html files. Here's how it's setup: sample directory tree c:/inetpub/ (nothing in here) d:/web_files/my_web_apps d:/web_files/my_web_apps/app1/ d:/web_files/my_web_apps/app2/ d:/web_files/my_web_apps/html_files/ app1 and app2 both access the same html_files directory, so html_files is set as a virtual directory in the web apps in IIS... sample web directory tree //app1/html_files/ (points to physical directory: d:/web_files/my_web_apps/html_files/) //app2/html_files/ (points to physical directory: d:/web_files/my_web_apps/html_files/) If I put a file called test.html in the root of //app1/ and then add the default mapping to the asp.net dll and setup my security on the root folder with deny="?", then accessing test.html works exactly as expected. If I'm not authenticated, it takes me to the login.aspx page, and if I am authenticated then it displays test.html. If I put the test.html file in the html_files directory I get a totally different behavior. Now the login.aspx page loads and I stuck some code in to check if I was still authenticated: <p>autheticated: <%=User.Identity.IsAuthenticated%></p> I figured it would say false because why else would it bother to load the login page? Nope, it says true - so it knows i'm authenticated, but it won't give me access to the test.html file. I've spent several hours on this and haven't been able to solve it. I'm going to spend some more time on google to see if I've missed something. Fingers crossed.

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  • Cant get Jquery ui autocomplete widget to work

    - by Boob
    Im trying to develop my first ASP.NET MVC web app and have run into a problem with the jquery ui autocomplete widget. At the moment I have a form with a number of text boxs which would lend themselves well to an autocomplete ability. The code for my "Make"(Car make) text box is show below: jquery: $(function() { $("#Make").autocomplete({ source: '<%=Url.Action("Make","AutoComplete") %>' }); }); ASP.NET MVC controller: public ActionResult Make(string term) { return Json(Service.GetHints(HintType.Make, term, 20)); } GetHints() returns an IList of Hints, an object with just label and value string properties. The documentation implies that this is what I should be returning to the jquery but it doesnt want to work? Can anyone give me any advice/help?

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  • How to configure CruiseControl.Net for Windows Authentication?

    - by balu
    I am using CruiseControl.Net for continuous integration which is now accessing the dashboard through login plugin, which in turn is authenticating and authorizing after verifying it with a set of users saved as XML file in the CruiseControl.Net server. Now, i need to bring in Windows Authentication to the system whereby which CruiseControl.Net server webdashboard when accessed from a client machine(local machine associated with a common server), would be authenticated and be authorized to access the CruiseControl.Net features based on the authority of the logged in users. Kindly guide me to go ahead with this, appreciate all kinds of resources that would be helpful for achieving this. Thanks.

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  • NET START command not passing parameters in Windows Server 2008

    - by Amanbbk
    My application calls a Stored Procedure, through the stored procedure I am calling a Windows Service using the NET START command as follows: SELECT @Cmd = 'Net Start ServiceName /"' + @param1 + '" /"' + @param2 + '"' Now the parameters passed here are not reaching the OnStart method. These values are blank. Protected Overrides Sub OnStart(ByVal args() As String) Try service1= New Service service1.param2 = args(1) service1.param1 = args(0) Here I get args(0) as the name of service instead of the value that is passed, and args(1) is blank. Although the args.Getlength(0) returns 2. The service starts successfully, it invokes the executable, but the parameters are not there. What can be the reason? Administrative access might be required in NET START command? Has the syntax changed for NET START command in Windows Server 2008? Windows Services do not accept parameters in Windows Server 2008? The same thing is running fine on Windows Server 2003.

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  • A control that contains multiple duplicate properties causing deadlock issues on IIS

    - by heads5150
    I am trying to work out if the above case is true for our site. I've been told by my hosting provider that this fix (http://support.microsoft.com/kb/974165) has to applied to our server due to performance issues. It basically describes an issues where UI code like: <asp:gridview id="GridView1" runat="server" ... PageSize="100" PagerSettings-Mode="Numeric" PagerStyle-BorderStyle="None" PagerStyle-BorderColor="Navy" PagerStyle-HorizontalAlign="Right" PagerSettings-PageButtonCount="2" PagerSettings-Position="Bottom"> <PagerStyle HorizontalAlign="Left" BorderColor="Navy" BorderStyle="None"></PagerStyle> ... <PagerSettings PageButtonCount="2"></PagerSettings> ... </asp:gridview> causing the following warning on the server "ISAPI 'C:\Windows\Microsoft.NET\Framework\v2.0.50727\aspnet_isapi.dll' reported itself as unhealthy for the following reason: 'Deadlock detected'." Does anybody know of a way that I can detect this issue in the build process or the debugger? Any help would be much appreciate.

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  • Strange exceptions using FindControl after implementing master pages

    - by inderio
    I have some simple repeater code given here: <asp:Repeater ID="ResultsRepeater" runat="server" DataSourceID="ResultsDS"> <HeaderTemplate> <table id="Results" class="data"> <tr id="Header" runat="server"> <th>Item</th> </tr> </table> </HeaderTemplate> </asp:Repeater> I used to be able to then access the repeater to get said header, as such: HtmlTableRow header = ResultsRepeater.Controls[0].Controls[0].FindControl("Header") as HtmlTableRow; After implementing master pages, I noticed my calls to header.InnerText and .InnerHtml throw exceptions, specifically: 'header.InnerHtml' threw an exception of type 'System.NotSupportedException' 'header.InnerText' threw an exception of type 'System.NotSupportedException' Can anyone share what's going on with me? I am of course assuming master pages caused this, since it's the only thing I've changed besides minor updates (that should not affect this in any way).

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  • How to Set a gridview column width when binding to a datatable

    - by Bob Avallone
    I am binding a table to a gridview in asp.net as such grdIssues.DataSource = mdtIssues; grdIssues.DataBind(); The problem is I cannot then control the column width, asp.net seems to decided on it's own what width each column should be. Methods such as grdIssues.Columns[0].ItemStyle.Width = 100; grdIssues.Columns[1].ItemStyle.Width = 100; don't work because the columns are created dynamically. I cannot believe there isn't a way to do this short of manually creating each column and filling each row. Regards, Bob Avallone

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  • customvalidator can't find controltovalidate

    - by ravi
    iam having a problem finding a textbox inside createuserwizard which is inside a contentplaceholder i have a custom validator for this textbox ..now when i put this customvalidator outside createuser wizard it says "cannot find controltovalidate control id CaptchaValue " heres is a row inside my createuserwizard <CreateUserWizard......> : : : <tr> </td> </tr> : : : </CreateUserWizard> and i have a customevalidator outside createuserwizard <asp:CustomValidator ID="CustomValidator5" runat="server" ControlToValidate="CaptchaValue" ErrorMessage="Image value must match" ValidationGroup="CreateUserWizard1" EnableClientScript="False"></asp:CustomValidator>

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  • StreamReader ReadToEnd() after HttpWebRequest EndGetResponse() - most scalable?

    - by frankadelic
    I am calling a RESTful web service in the back-end of some ASP.NET pages. I am using ASP.NET asynchronous pages, so under the hood I am using the methods: HttpWebRequest BeginGetResponse() and HttpWebRequest EndGetResponse() The response string in my case is always a JSON string. I use the following code to read the entire string: using (StreamReader sr = new StreamReader(myHttpWebResponse.GetResponseStream())) { myObject.JSONData = sr.ReadToEnd(); } Is this method OK in terms of scalability? I have seen other code samples that instead retrieve the response data in blocks using Read(). My primary goal is scalability, so this back-end call can be made across many concurrent page hits. Thanks, Frank

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  • SubWebFolder and mutliple bin folders with Website model?

    - by OutOFTouch
    Hi, I am looking for some advice on how what is the best approach to subweb folders and having mutliple bin folders in the WebSite Project model. For adding new pages at a later stage without recompiling the core files of a website and without building a full fledged Plug-in framework api. I am aware of being able to drop in the compiled dlls into the main bin folder and to just copy over the new page files to a sub folder but I am looking for a more organized file/folder approach. Here is the how it was done with WAP: Moving the Code-Behind Assemblies/DLLs to a different folder than /BIN with ASP.NET 1.1 Multiple /bin folders in ASP.NET I should also mention that I see that I can still do it the old way with the website project model by making the adjustment to the config section mentioned here but I was wondering if that has any side affects. AssemblyBinding in Web Config and XMLNS

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  • Getting IIS Worker Process Crash dumps

    - by CVertex
    I'm doing something bad in my ASP.NET app. It could be the any number of CTP libraries I'm using or I'm just not disposing something properly. But when I redeploy my ASP.NET to my Vista IIS7 install or my server's IIS6 install I crash an IIS worker process. I've narrowed the problem down to my HTTP crawler, which is a multithreaded beast that crawls sites for useful information when asked to. After I start a crawler and redeploy the app over the top, rather than gracefully unloading the appDomain and reloading, an IIS worker process will crash (popping up a crash message) and continue reloading the app domain. When this crash happens, where can I find the crash dump for analysis?

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  • Decode html tag so that it can be read when it goes back to the server more specifically the controller

    - by Yusuf
    My engine is Aspx. How can I decode/encode the html tags that is in my text box. I have the html tag to make it more readable. I tried the ValidationRequest and the htmlDecode(freqQuestion.Answer) but no luck. I just keep getting the same message. Server Error in '/Administrator' Application. A potentially dangerous Request.Form value was detected from the client (QuestionAnswer="...ics Phone:123-456-7890 Description: Request Validation has detected a potentially dangerous client input value, and processing of the request has been aborted. This value may indicate an attempt to compromise the security of your application, such as a cross-site scripting attack. To allow pages to override application request validation settings, set the requestValidationMode attribute in the httpRuntime configuration section to requestValidationMode="2.0". Example: . After setting this value, you can then disable request validation by setting validateRequest="false" in the Page directive or in the configuration section. However, it is strongly recommended that your application explicitly check all inputs in this case. For more information, see http://go.microsoft.com/fwlink/?LinkId=153133. View Page <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" validateRequest="false" Inherits="System.Web.Mvc.ViewPage<dynamic>" %> <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> EditFreqQuestionsUser </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <script type="text/javascript"> $(document).ready(function () { $("#freqQuestionsUserUpdateButton").click(function () { $("#updateFreqQuestionsUser").submit(); }); }); </script> <h2>Edit Freq Questions User </h2> <%Administrator.DarkstarAdminProductionServices.FreqQuestionsUser freqQuestionsUser = ViewBag.freqQuestionsUser != null ? ViewBag.freqQuestionsUser : new Administrator.DarkstarAdminProductionServices.FreqQuestionsUser(); %> <%List<string> UserRoleList = Session["UserRoles"] != null ? (List<string>)Session["UserRoles"] : new List<string>(); %> <form id="updateFreqQuestionsUser" action="<%=Url.Action("SaveFreqQuestionsUser","Prod")%>" method="post"> <table> <tr> <td colspan="3" class="tableHeader">Freq Questions User Details <input type ="hidden" value="<%=freqQuestionsUser.freqQuestionsUserId%>" name="freqQuestionsUserId"/> </td> </tr> <tr> <td colspan="2" class="label">Question Description:</td> <td class="content"> <input type="text" maxlength="2000" name="QuestionDescription" value="<%=freqQuestionsUser.questionDescription%>" /> </td> </tr> <tr> <td colspan="2" class="label">QuestionAnswer:</td> <td class="content"> <input type="text" maxlength="2000" name="QuestionAnswer" value="<%=Server.HtmlDecode(freqQuestionsUser.questionAnswer)%>" /> </td> </tr> <tr> <td colspan="3" class="tableFooter"> <br /> <a id="freqQuestionsUserUpdateButton" href="#" class="regularButton">Save</a> <a href="javascript:history.back()" class="regularButton">Cancel</a> </td> </tr> </table> </form> </asp:Content> Controller [AuthorizeAttribute(AdminRoles = "EditFreqQuestionsUser")] public ActionResult SaveFreqQuestionsUser(string QuestionDescription, string QuestionAnswer) { Guid freqQuestionsUserId = Request.Form["freqQuestionsUserId"] != null ? new Guid(Request.Form["freqQuestionsUserId"]) : Guid.Empty; //load agreement eula ref AdminProductionServices.FreqQuestionsUser freqqQuestionsUser = Administrator.Models.AdminProduction.FreqQuestionsUser.LoadFreqQuestionsUser(freqQuestionsUserId, string.Empty, string.Empty)[0]; freqqQuestionsUser.questionDescription = QuestionDescription; freqqQuestionsUser.questionAnswer = QuestionAnswer; //save it Administrator.Models.AdminProduction.FreqQuestionsUser.addFreqQuestionsUser(freqqQuestionsUser); return RedirectToAction("SearchFreqQuestionsUser", "Prod", new { FreqQuestionsUserId = freqQuestionsUserId }); }

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  • RIA Services: custom autorization

    - by Budda
    Here is a good example how to create custom autorization for RIA services: http://stackoverflow.com/questions/1195326/ria-services-how-can-i-create-custom-authentication In my case a silverlight-pages will be displayed as a part of HTML-content and user authorisation is already implemented on the server-side (ASP.NET Membership is not used). It is required to show on the silverlight pages different information for authorised and non-authorised users. Is there any possibility to track on the Silverlight side if user is already authorized on the server side (on the usual ASP.NET web-site)? Please adivse how to do this. Thank you in advance.

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  • syntax in sqldatasource selectcommand

    - by netNewbi3
    Hi, My SqlDataSource selectcommand is dynamically changed by the String.Format functionality of the Eval one-way databinding syntax. It works ok. However I need to put together two columns values with a space in the middle (ItemType + '" "' + ItemDescription As ItemInfo) but I can't get the syntax correct as I get the message: "The server tag is not well formed" Can you help? Many thanks <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:conn %>" SelectCommand='<%# Eval("TypeID", "SELECT ItemID, ItemType, ItemType + '" "' + ItemDescription As ItemInfo WHERE ItemType = {0}")%>'> </asp:SqlDataSource>

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  • How to be sure that my MVC project is runting on the correct version after upgrade to vs2010?

    - by Stephane
    I just installed visual studio 2010 and upgraded my MVC project (which was running on MVC RC2 in visual studio 2008). visual studio 2010 updated every project file to target the framework 4.0. But the system.web.dll is pointing to C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 2\Assemblies\System.Web.Mvc.dll in VS2010 object browser, I have every dll showing up in multiple versions as expected (3.5.0.0 and 4.0.0.0) except for the System.Web.Mvc dll which doesn't show any version and points to the path I mentioned above. Isn't this namespace point to the Framework folder like the System.Web namespace? C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.0\System.Web.dll

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  • How to change values of ListView elements in Codebehind

    - by Viredae
    Hello, I'm trying to create a table with Listview and one of the fields I'm using is supposed to show a hyperlink to a more detailed view of the data shown, how I want to do that is by using FindControl on the ID of that item and then changing the value into a hyperlink of the detailed view page with a querystring attached, the problem is that I have no idea how to re-insert that data back into the listview field, which looks something like this: <ItemTemplate> <td> <asp:Label ID="ViewLinkLabel" runat="server" Text='[insert Link Here]' /> </td> </ItemTemplate> Please bear in mind that I'm still an amateur in ASP.net, and if any of this seems too convoluted when there's a much easier to do this that I don't know about. Thank you

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  • Is there an equivalent to Java's ClassFileTransformer in .NET? (a way to replace a class)

    - by Alix
    I've been searching for this for quite a while with no luck so far. Is there an equivalent to Java's ClassFileTransformer in .NET? Basically, I want to create a class CustomClassFileTransformer (which in Java would implement the interface ClassFileTransformer) that gets called whenever a class is loaded, and is allowed to tweak it and replace it with the tweaked version. I know there are frameworks that do similar things, but I was looking for something more straightforward, like implementing my own ClassFileTransformer. Is it possible? EDIT #1. More details about why I need this: Basically, I have a C# application and I need to monitor the instructions it wants to run in order to detect read or write operations to fields (operations Ldfld and Stfld) and insert some instructions before the read/write takes place. I know how to do this (except for the part where I need to be invoked to replace the class): for every method whose code I want to monitor, I must: Get the method's MethodBody using MethodBase.GetMethodBody() Transform it to byte array with MethodBody.GetILAsByteArray(). The byte[] it returns contains the bytecode. Analyse the bytecode as explained here, possibly inserting new instructions or deleting/modifying existing ones by changing the contents of the array. Create a new method and use the new bytecode to create its body, with MethodBuilder.CreateMethodBody(byte[] il, int count), where il is the array with the bytecode. I put all these tweaked methods in a new class and use the new class to replace the one that was originally going to be loaded. An alternative to replacing classes would be somehow getting notified whenever a method is invoked. Then I'd replace the call to that method with a call to my own tweaked method, which I would tweak only the first time is invoked and then I'd put it in a dictionary for future uses, to reduce overhead (for future calls I'll just look up the method and invoke it; I won't need to analyse the bytecode again). I'm currently investigating ways to do this and LinFu looks pretty interesting, but if there was something like a ClassFileTransformer it would be much simpler: I just rewrite the class, replace it, and let the code run without monitoring anything. An additional note: the classes may be sealed. I want to be able to replace any kind of class, I cannot impose restrictions on their attributes. EDIT #2. Why I need to do this at runtime. I need to monitor everything that is going on so that I can detect every access to data. This applies to the code of library classes as well. However, I cannot know in advance which classes are going to be used, and even if I knew every possible class that may get loaded it would be a huge performance hit to tweak all of them instead of waiting to see whether they actually get invoked or not. POSSIBLE (BUT PRETTY HARDCORE) SOLUTION. In case anyone is interested (and I see the question has been faved, so I guess someone is), this is what I'm looking at right now. Basically I'd have to implement the profiling API and I'll register for the events that I'm interested in, in my case whenever a JIT compilation starts. An extract of the blogpost: In your ICorProfilerCallback2::ModuleLoadFinished callback, you call ICorProfilerInfo2::GetModuleMetadata to get a pointer to a metadata interface on that module. QI for the metadata interface you want. Search MSDN for "IMetaDataImport", and grope through the table of contents to find topics on the metadata interfaces. Once you're in metadata-land, you have access to all the types in the module, including their fields and function prototypes. You may need to parse metadata signatures and this signature parser may be of use to you. In your ICorProfilerCallback2::JITCompilationStarted callback, you may use ICorProfilerInfo2::GetILFunctionBody to inspect the original IL, and ICorProfilerInfo2::GetILFunctionBodyAllocator and then ICorProfilerInfo2::SetILFunctionBody to replace that IL with your own. The great news: I get notified when a JIT compilation starts and I can replace the bytecode right there, without having to worry about replacing the class, etc. The not-so-great news: you cannot invoke managed code from the API's callback methods, which makes sense but means I'm on my own parsing the IL code, etc, as opposed to be able to use Cecil, which would've been a breeze. I don't think there's a simpler way to do this without using AOP frameworks (such as PostSharp). If anyone has any other idea please let me know. I'm not marking the question as answered yet.

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  • Using WeakReference to resolve issue with .NET unregistered event handlers causing memory leaks.

    - by Eric
    The problem: Registered event handlers create a reference from the event to the event handler's instance. If that instance fails to unregister the event handler (via Dispose, presumably), then the instance memory will not be freed by the garbage collector. Example: class Foo { public event Action AnEvent; public void DoEvent() { if (AnEvent != null) AnEvent(); } } class Bar { public Bar(Foo l) { l.AnEvent += l_AnEvent; } void l_AnEvent() { } } If I instantiate a Foo, and pass this to a new Bar constructor, then let go of the Bar object, it will not be freed by the garbage collector because of the AnEvent registration. I consider this a memory leak, and seems just like my old C++ days. I can, of course, make Bar IDisposable, unregister the event in the Dispose() method, and make sure to call Dispose() on instances of it, but why should I have to do this? I first question why events are implemented with strong references? Why not use weak references? An event is used to abstractly notify an object of changes in another object. It seems to me that if the event handler's instance is no longer in use (i.e., there are no non-event references to the object), then any events that it is registered with should automatically be unregistered. What am I missing? I have looked at WeakEventManager. Wow, what a pain. Not only is it very difficult to use, but its documentation is inadequate (see http://msdn.microsoft.com/en-us/library/system.windows.weakeventmanager.aspx -- noticing the "Notes to Inheritors" section that has 6 vaguely described bullets). I have seen other discussions in various places, but nothing I felt I could use. I propose a simpler solution based on WeakReference, as described here. My question is: Does this not meet the requirements with significantly less complexity? To use the solution, the above code is modified as follows: class Foo { public WeakReferenceEvent AnEvent = new WeakReferenceEvent(); internal void DoEvent() { AnEvent.Invoke(); } } class Bar { public Bar(Foo l) { l.AnEvent += l_AnEvent; } void l_AnEvent() { } } Notice two things: 1. The Foo class is modified in two ways: The event is replaced with an instance of WeakReferenceEvent, shown below; and the invocation of the event is changed. 2. The Bar class is UNCHANGED. No need to subclass WeakEventManager, implement IWeakEventListener, etc. OK, so on to the implementation of WeakReferenceEvent. This is shown here. Note that it uses the generic WeakReference that I borrowed from here: http://damieng.com/blog/2006/08/01/implementingweakreferencet I had to add Equals() and GetHashCode() to his class, which I include below for reference. class WeakReferenceEvent { public static WeakReferenceEvent operator +(WeakReferenceEvent wre, Action handler) { wre._delegates.Add(new WeakReference<Action>(handler)); return wre; } public static WeakReferenceEvent operator -(WeakReferenceEvent wre, Action handler) { foreach (var del in wre._delegates) if (del.Target == handler) { wre._delegates.Remove(del); return wre; } return wre; } HashSet<WeakReference<Action>> _delegates = new HashSet<WeakReference<Action>>(); internal void Invoke() { HashSet<WeakReference<Action>> toRemove = null; foreach (var del in _delegates) { if (del.IsAlive) del.Target(); else { if (toRemove == null) toRemove = new HashSet<WeakReference<Action>>(); toRemove.Add(del); } } if (toRemove != null) foreach (var del in toRemove) _delegates.Remove(del); } } public class WeakReference<T> : IDisposable { private GCHandle handle; private bool trackResurrection; public WeakReference(T target) : this(target, false) { } public WeakReference(T target, bool trackResurrection) { this.trackResurrection = trackResurrection; this.Target = target; } ~WeakReference() { Dispose(); } public void Dispose() { handle.Free(); GC.SuppressFinalize(this); } public virtual bool IsAlive { get { return (handle.Target != null); } } public virtual bool TrackResurrection { get { return this.trackResurrection; } } public virtual T Target { get { object o = handle.Target; if ((o == null) || (!(o is T))) return default(T); else return (T)o; } set { handle = GCHandle.Alloc(value, this.trackResurrection ? GCHandleType.WeakTrackResurrection : GCHandleType.Weak); } } public override bool Equals(object obj) { var other = obj as WeakReference<T>; return other != null && Target.Equals(other.Target); } public override int GetHashCode() { return Target.GetHashCode(); } } It's functionality is trivial. I override operator + and - to get the += and -= syntactic sugar matching events. These create WeakReferences to the Action delegate. This allows the garbage collector to free the event target object (Bar in this example) when nobody else is holding on to it. In the Invoke() method, simply run through the weak references and call their Target Action. If any dead (i.e., garbage collected) references are found, remove them from the list. Of course, this only works with delegates of type Action. I tried making this generic, but ran into the missing where T : delegate in C#! As an alternative, simply modify class WeakReferenceEvent to be a WeakReferenceEvent, and replace the Action with Action. Fix the compiler errors and you have a class that can be used like so: class Foo { public WeakReferenceEvent<int> AnEvent = new WeakReferenceEvent<int>(); internal void DoEvent() { AnEvent.Invoke(5); } } Hopefully this will help someone else when they run into the mystery .NET event memory leak!

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