.net

问题 I have created following code Dim ConnectionString As String = ConfigurationManager.ConnectionStrings("default").ConnectionString Dim con As New SqlConnection(ConnectionString) con.Open() Response.Write("Connection Opened<br/>") con.Close() Response.Write("Connection Closed<br/>") in a web application project Target .NET Framework 4.0 but it is giving System.AccessViolationException i cannot understand why. if i change the target Framework to .NET 3.0 then the code runs fine. Below is the

问题 I get this InnerException with below Exception Tree; My Code is; public T GetQueryResultsFromQuery<T>(string query) { try { HttpClient client = new HttpClient(); System.Net.ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls | SecurityProtocolType.Ssl3; var results = client.GetAsync(query).GetAwaiter().GetResult(); // error happens here return _jsonHelper.DeserializeObject<T>(results.Content.ReadAsStringAsync().GetAwaiter(

问题 I have an application with a .NET c# middle tier and angular front end. I am calling an api which results in a long running process. In IE I captured a message saying net::ERR_CONNECTION_RESET. In Chrome, I'm seeing a failed status after 10 minutes. I looked in our log tables and event viewer. The process is running on the server without failure, but something is causing the api controller method to run multiple times, every 5 minutes. In my developer tools there is no network indicator that

问题 I am trying to load the XMl file using SSIS. I have My Sample XML and corresponding XSD. In my SSIS package XML Soruce, provided the Input XML File path and XSD path and when i am tryng to see the columns then i was getting the below error The Component "XML Source" Was unable to process the XML data. ambiguous complextype definition. The Element 'childusages' has multiple members named 'usages' And i tried validating the XML and corresponding XSD with .Net(C# or VB) and it passed the

问题 I am trying to load the XMl file using SSIS. I have My Sample XML and corresponding XSD. In my SSIS package XML Soruce, provided the Input XML File path and XSD path and when i am tryng to see the columns then i was getting the below error The Component "XML Source" Was unable to process the XML data. ambiguous complextype definition. The Element 'childusages' has multiple members named 'usages' And i tried validating the XML and corresponding XSD with .Net(C# or VB) and it passed the

问题 I have a class which implements IDisposable interface. using System; class A : IDisposable { public void Dispose() { Stop(); // some actions to stop internal threads this = null; } } Why can't I assign this = null in Dispose method ? I know 'this' is read-only. For example: A a = new A(); a.Run(); // ... a.Dispose(); // i want in this line a = null I thought IDisposable and Dispose method guarantee that instance of class A will be equals to null after calling Dispose(). But it's not true. 回答1

问题 Listing all files in a drive other than my system drive throws an UnauthorizedAccessException . How can I solve this problem? Is there a way to grant my application the access it needs? My code: Directory.GetFiles("S:\\", ...) 回答1: Here's a class that will work: public static class FileDirectorySearcher { public static IEnumerable<string> Search(string searchPath, string searchPattern) { IEnumerable<string> files = GetFileSystemEntries(searchPath, searchPattern); foreach (string file in files

问题 How to customize legends in livecharts in winforms ? I was trying to get some thing like this. In live chart winforms, I can only see these two options scatterChart.LegendLocation = LegendLocation.Right; scatterChart.DefaultLegend.Visibility = Visibility.Visible; But this wont help me to achieve a legend as I shown in the link. Would like to know some solutions. Thanks in advance. 回答1: We can create a DefaultLegend and add our properties into it and assign to chart's DefaultLegend as follows

问题 How to subtract one list from another? List<string> l1 = new List<string> { "abc", "abc", "abc", "def" }; List<string> l2 = new List<string> { "abc" }; var r = l1.Except(l2).ToList(); Doing this results in r => "def" instead of r=> "abc", "abc", "def". I mean, the second list only contains "abc" one time. So I want to remove only one instance of "abc" of the first list. Btw: Is there a way to check if one list is completely contained in another list? Meaning when list1 only contains "abc" one

问题 How to subtract one list from another? List<string> l1 = new List<string> { "abc", "abc", "abc", "def" }; List<string> l2 = new List<string> { "abc" }; var r = l1.Except(l2).ToList(); Doing this results in r => "def" instead of r=> "abc", "abc", "def". I mean, the second list only contains "abc" one time. So I want to remove only one instance of "abc" of the first list. Btw: Is there a way to check if one list is completely contained in another list? Meaning when list1 only contains "abc" one