.net-4.0

问题 This question already has answers here : Closed 6 years ago . Possible Duplicate: Should you access a variable within the same class via a Property? I ran into this recently and was curious if there was some sort of standard for which one you should reference while inside a class. I mean really it shouldn't make a difference whether you access the member variable directly or go through the property (unless you need to dodge some custom setter code), but I wanted to be sure there wasn't a best

问题 What are the requirements for the upcoming .NET 4 release? Searched around for this and couldn't seem to find a definitive answer. Specifically... Will clients have to upgrade their .NET Framework CLR (like from 1.1 to 2.0) to run 4.0-targeted applications? Will ASP.NET require a framework upgrade or will behavior be similar to 2.0 running 3.5 apps? 回答1: Will clients have to upgrade their .NET Framework CLR (like from 1.1 to 2.0) to run 4.0-targeted applications? Yes, provided you target .NET

问题 I'm pretty sure I know the answer but I'm wondering if there's a way to define a global "using" directive in my C# projects so that I don't have to repeat the directive on top of every code file. My interest is really rooted with the introduction of extension methods in the .NET Framework. The only way to use an extension method is to define a using directive for the namespace containing the extension methods. Without the using directive, I lose Intellisense capabilities for the extension

问题 Good day. I'm working on file downloader class using DownloadFileAsync. In normal situations everything works fine. But when I'm downloading file and disable network connection, downloading progress is just stops for infinite time, without raising any errors or calling any callbacks. Any ideas how to handle this situation? Many thanks. _client.Proxy = WebRequest.DefaultWebProxy; _client.DownloadProgressChanged += (sender, argv) => { actionCallback(argv.ProgressPercentage); } _client

问题 I'm curious about the performance characteristics of Parallel.ForEach. Given any valid construct inside a Parallel.ForEach loop, is it always preferable to use Parallel.ForEach over a foreach loop? I'm specifically wondering about the overhead of invoking the Parallel Tasks library on small sets or other edge cases where a foreach loop might be faster. I know the library is pretty smart about when/how to spawn threads...are there cases where it's better to just leave code in a foreach loop,

问题 I am developing a Wpf application which retrieves the data from a database using EF. I have some ListView controls which are filled with some tables of the database so in order to prevent from blocking the UI while retrieving the data I do as follows: Task tsk = Task.Factory.StartNew(() => { ItemsSource = Database.SomeTable(); }); The ItemsSource variable is an ObservableCollection which is bound to the ItemsSource property of a ListView. The thing is that, as expected, while loading the data

问题 I am getting this error when I attempt to build my project in VS 2010 Warning 2 Cannot find wrapper assembly for type library "VBIDE". Anyone experienced this before? Any ideas what could be the cause? 回答1: I have had that issue as well. I did ended up copying the VBIDE from a peer's machine. It worked fine after that. 来源： https://stackoverflow.com/questions/4167545/warning-when-attempting-a-build-in-vs-2010

问题 I am getting this error when I attempt to build my project in VS 2010 Warning 2 Cannot find wrapper assembly for type library "VBIDE". Anyone experienced this before? Any ideas what could be the cause? 回答1: I have had that issue as well. I did ended up copying the VBIDE from a peer's machine. It worked fine after that. 来源： https://stackoverflow.com/questions/4167545/warning-when-attempting-a-build-in-vs-2010

问题 I just wrote this method and I'm wondering if something similar already exists in the framework? It just seems like one of those methods... If not, is there a better way to do it? /// <summary> /// Return the whitespace at the start of a line. /// </summary> /// <param name="trimToLowerTab">Round the number of spaces down to the nearest multiple of 4.</param> public string GetLeadingWhitespace(string line, bool trimToLowerTab = true) { int whitespace = 0; foreach (char ch in line) { if (ch !=

问题 I'm having some issues when trying to authenticate users against an existing ASP.NET membership database using PHP. I've searched the web and the existing answers that I've found don't seem to be working for me. Namely: public static function Hash($password, $salt) { $decodedSalt = base64_decode($salt); $utf = mb_convert_encoding($password, 'UTF-16LE', 'UTF-8'); return base64_encode(sha1($decodedSalt.$utf, true)); } I think that part of the issue is that the password hashes aren't actually