c#-4.0

问题 I have a structure like this: No ID Name Status 1 1 A 1 2 1 B 1 3 1 c 1 4 1 D 1 5 2 E 3 6 2 F 3 7 2 G 3 I want to run a linq when I get a list results get maximum row where for each status and row details as well.Like: No ID Name Status 4 1 D 1 7 2 G 3 Means latest entry for the status. Is there a way around, as I have tried all Max, Orderby descending but I get single result but I need a List as a result. 回答1: You have to extract the groups of a same id (GroupBy), and then export the max No

问题 I am using the tools in the .Net System.DirectoryServices.AccountManagement namespace to manage Active Directory groups - group creation, adding users to groups, removing users from group, etc. Here's some code that shows what I'm doing right now... -- group creation // connect to our organizational unit on the production Active Directory Server using (PrincipalContext principalCtx = new PrincipalContext(ContextType.Domain, s_prodAdServerName, s_ouPath)) { // create group with necessary

问题 I have developed for windows 8/8.1. Its scrollviewer generates events while scrolling like - ViewChanging/ViewChanged. I couldn't find any such event for scrollviewer in windows phone 8. How can i listen to when the scrollviewer is scrolling in WP8? I am trying to look for method similar to -ScrollViewDidScroll() of iOS development. 回答1: Have tried to use this event? - ScrollViewer.ViewChanged event 回答2: If you are using a ScrollViewer, or a ListBox you can listen to the LayoutUpdated event

问题 In SQL Server, uniqueidentifier columns can be used like strings with the LIKE comparison: SELECT * FROM dbo.Table WHERE GuidColumn LIKE '4c38e01e%' How can I use this feature in Entity Framework? I want something like this context.Table.Where(x => x.StringColumn.Contains("some string")) but for a Guid column instead for string columns: context.Table.Where(x => x.GuidColumn ???? "4c38e01e") 回答1: As far as I know there is no way to convert Guid to string on the fly in EntityFramework. I'm

问题 I wonder what the best approach is in implementing a logger which essentially eats all Console.WriteLine() messages and spits out a text file of all these messages. I know I could use a StringBuilder and populate it with all the messages by doing .AppendLine wherever Console.WriteLine occurs...but I am looking for something more magical than that. Some way using which I don't have to write as many lines of code as Console.WriteLine s in existing code. And in case you missed the tags, this is

问题 Option I want to use when sending the email is accessed in outlook. Permission option I need to set Do not forward permission of EmailMessage object in Microsoft exchange service code but I am not able to set it to true. ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack; ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2); service.Credentials = new WebCredentials("abc", "xyz", "bbb"); service.AutodiscoverUrl("xyz@abc.com",

问题 Option I want to use when sending the email is accessed in outlook. Permission option I need to set Do not forward permission of EmailMessage object in Microsoft exchange service code but I am not able to set it to true. ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack; ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2); service.Credentials = new WebCredentials("abc", "xyz", "bbb"); service.AutodiscoverUrl("xyz@abc.com",

问题 I have an application where uses post comments. Security is not an issue. string url = http://example.com/xyz/xyz.html?userid=xyz&comment=Comment What i want is to extract the userid and comment from above string. I tried and found that i can use IndexOf and Substring to get the desired code BUT what if the userid or comment also has = symbol and & symbol then my IndexOf will return number and my Substring will be wrong. Can you please find me a more suitable way of extracting userid and

问题 Every example in the directshow.net samples folder (marked "2010-February") compiles fine, and those that play videos from files work great. However, every example that tries to enumerate the FilterCategory.VideoInputDevices always fails to find any of my filters, specifically DsDevice.GetDevicesOfCat(FilterCategory.VideoInputDevice); always returns that I have no devices. This same problem occurs for me in every other program that uses directshow.net, like touchless and the various examples

问题 I have a layout page that has one dropdown box. I created 3 views that will make use of this layout. The value selected in the dropdown will be used in all 3 views created. I have actionlinks used for navigation in the layout. Here is what I will like to achieve Avoid reloading the entire page(layout) when I navigate from view to view since I want to keep the dropdown value selected. How can I achieve this such that it is only the content of the views that will be changing when I navigate