.net-4.0

问题 I'm using the WebBrowser control in a WinForms application and have implemented my own download manager by following the instructions here. My custom download manager works, but also overrides the download manager for Internet Explorer , too*. Is there a way to only have the custom download manager appear when my application is running? Or is there a way to unregistered it when my application closes? *I appreciate that is precisely the point of implementing IDownloadManager , and the

问题 are there any alternative to transactionScope which does not need to enable DTC?? In the transaction I need to make two operations: Create one user (using membership - sql membership provider) Do one insert operation. 回答1: TransactionScope uses the LTM - Lightweight Transaction Manager in .Net. Only if you open more than one connection in the same transaction or go between databases, should TransactionScope promote the transaction to the 2PC-based TX-manager, DTC. For MS SQL Server 2008 and

问题 I want to queue dependant tasks across several flows that need to be processed in order (in each flow). The flows can be processed in parallel. To be specific, let's say I need two queues and I want the tasks in each queue to be processed in order. Here is sample pseudocode to illustrate the desired behavior: Queue1_WorkItem wi1a=...; enqueue wi1a; ... time passes ... Queue1_WorkItem wi1b=...; enqueue wi1b; // This must be processed after processing of item wi1a is complete ... time passes ..

问题 In .NET 4, is there any functional equivalent to .NET 4.5's System.Threading.Tasks.Task.WhenAll()? The goal is to wrap up multiple async tasks into a single one that is completed when all of its constituent tasks are done. 回答1: I think the closest thing built-in in .Net 4.0 is ContinueWhenAll(). You can make the continuationAction a simple tasks => tasks and use the returned Task . For performance reasons, you might want to use it with TaskContinuationOptions.ExecuteSynchronously . 回答2: In

问题 In .NET 4, is there any functional equivalent to .NET 4.5's System.Threading.Tasks.Task.WhenAll()? The goal is to wrap up multiple async tasks into a single one that is completed when all of its constituent tasks are done. 回答1: I think the closest thing built-in in .Net 4.0 is ContinueWhenAll(). You can make the continuationAction a simple tasks => tasks and use the returned Task . For performance reasons, you might want to use it with TaskContinuationOptions.ExecuteSynchronously . 回答2: In

问题 Is there any change in .Net 4.0 garbage collector execution? 回答1: Here's a blog posting: http://geekswithblogs.net/sdorman/archive/2008/11/07/clr-4.0-garbage-collection-changes.aspx and http://www.infoq.com/news/2009/06/Background-Collector 回答2: There is also AppDomainResourceManager feature, which allows you to track resource usage ( Memory and CPU ) per appdomain. the GC part of this feature is the ability to get per appdomain memory tracking. 回答3: There's also an ephemeron implemenation

问题 I have a client/server app. The server component runs, uses WCF in a 'remoting' fashion (binary formatter, session objects). If I start the server component and launch the client, the first task the server does completes in <0.5sec. If I start the server component with VS debugger attached, and then launch the client, the task takes upwards of 20sec to complete. There are no code changes - no conditional compilation changes. The same occurs whether I have the server component compiled and

问题 I was thinking , The WebApi along with routing mechanism works in such way that it reads the http verb ( GET POST etc...) and then searches for matched method names / parameters : For example : If it's GET and the URI is api/Customers/5 : method should start with Get if it has ID so search a method which accepts int as parameter. etc. (there are more rules). I mostly believe they did it using reflection. Question : Isn't it a performance hit , for every URI request - to search all this data

问题 I have written a Custom Delegating Handler which add custom headers to the response & checks in the request . I added the handles in WebAPi configuration config.MessageHandlers.Add(new customHandler()); But the issue is applies to all the controllers. I need to apply custom header specific to a controllers. Is it possible to add custom handlers specific to a controller? 回答1: At the end of this article it explains how to apply handlers only to certain routes: http://www.asp.net/web-api

问题 I just built dynamic method - see below (thanks to the fellow SO users). It appears that the Func created as a dynamic method with IL injection 2x slower than the lambda. Anyone knows why exactly? (EDIT : this was built as Release x64 in VS2010. Please run it from console not from inside Visual Studio F5.) class Program { static void Main(string[] args) { var mul1 = IL_EmbedConst(5); var res = mul1(4); Console.WriteLine(res); var mul2 = EmbedConstFunc(5); res = mul2(4); Console.WriteLine(res)