c#-4.0

问题 In my one of the MSI Installer I am updating the assembly and project reference relative path pro-grammatically.My all reference assemblies inside my application folder. I try to implement both the path relative and absolute path. Both are working fine. Relative Path <Reference Include="log4net"> <HintPath>..\..\..\..\log4net.dll</HintPath> </Reference> Absolute path <Reference Include="log4net"> <HintPath>C:\Program files\Myapplication\log4net.dll</HintPath> </Reference> I have only seen

问题 Is it possible to to specify ApplicationName in NpgSql connection string? The following resource usually helps, but it says nothing in this case: Npgsql connection strings 回答1: ApplicationName works for me - "Server=localhost;Port=5432;User Id=***;Password=***;Database=***;ApplicationName=test" . 回答2: In case there are people who searched for answer to this question, here is the solution: application_name=MyApp will not work for npgsql version 2.2.4.3 (Latest Released 2015-02-05) Change

问题 I'm considering making limited use of C#'s dynamic keyword. My initial time trials were astonishing - a performance hit of less than a second for 100,000 iterations (likely due to DLR caching). I don't have access to a memory profiler, though, and Eric Lippert wrote: Then it starts up the DLR [...] The DLR then starts up a special version of the C# compiler... What's the memory footprint of this, and is it unloaded when the dynamic code is garbage-collected? 回答1: is it unloaded when the

问题 I Use Oledb to read an AccessFile(.accdb) to DataSet, I don't know about table names or columns, The regular implementation is: public void GetAccessDB(string filepath){ this.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source = " + filepath; // get Table Names this.TableNames = new List<string>(); using (System.Data.OleDb.OleDbConnection oledbConnection = new System.Data.OleDb.OleDbConnection(this.ConnectionString)) { oledbConnection.Open(); System.Data.DataTable dt = null; dt

问题 Am testing out Entity Framework Core, it's been well so far until i hit an error. I am not able to execute sql from a DbSet with FromSql. Error is dbset does not contain a definition for 'FromSql' The code is _context.Account.FromSql("Select * from dbo.Account"); What am i doing wrong? 回答1: It happened that I needed one more nuget package to get FromSql as well as Include to work. I added this to my dependencies in the project.json file and after the restore, Voila. "Microsoft

问题 I click on a grid header to sort a column and then click a "Reset" button to clear the sort descriptions through its collection view. But the sort arrow icon still persists in the header. How to remove it? 回答1: simple solution i can think of is foreach (DataGridColumn column in DataGridView.Columns) { column.SortDirection = null; } 回答2: I came across this question whilst trying to work out how to clear the sort from the grid completely. Thanks to [krishnaaditya] for the answering how to clear

问题 I'm developing a magnifier in C# .NET (using WindowsForm) that shows a top-most click-able through form. This top-most window shows an specific part of the screen. The problem I'm having is that to take the screenshot I need to Hide() and Show() the form (otherwise I would take a screenshot of the magnifier) and this creates an annoying flickering in which the magnifier disappears and rapidly appears again. How could I take a screenshot of the Desktop without hiding/showing the form? Is there

问题 I have the following HttpModule that I wanted to unit test. Problem is I am not allowed to change the access modifiers/static as they need to be as it is. I was wondering what would be the best method to test the following module. I am still pretty new in testing stuff and mainly looking for tips on testing strategy and in general testing HttpModules. Just for clarification, I am just trying to grab each requested URL(only .aspx pages) and checking if the requested url has permission (for

问题 http://msdn.microsoft.com/en-us/library/ah19swz4(v=VS.71).aspx As per the above link….. “Structs, however, inherit from the base class Object……” As per the below link http://msdn.microsoft.com/en-us/library/system.valuetype.aspx Struct is implemented after ValueType in the hierarchy. “struct” is derived from which class? Or compiler treats “struct” reserve word to make any declaration using “struct” as value type? Missing the small thread in overall understanding. Thank you for your help.

问题 http://msdn.microsoft.com/en-us/library/ah19swz4(v=VS.71).aspx As per the above link….. “Structs, however, inherit from the base class Object……” As per the below link http://msdn.microsoft.com/en-us/library/system.valuetype.aspx Struct is implemented after ValueType in the hierarchy. “struct” is derived from which class? Or compiler treats “struct” reserve word to make any declaration using “struct” as value type? Missing the small thread in overall understanding. Thank you for your help.