c#-4.0

问题 Why does my parameter x behave so erratically? Example 1 - Doesn't exist in the current context. Example 2 - Cannot reuse x because it's defined in a 'child' scope. Example 3 - Fine. This is the part where I am confused. Perhaps a different 'child' scope? Example 1 : List<int> list = new List<int> { 1, 2, 3, 4, 5 }; var result = list.Where(x => x < 3); Console.Write(result.ElementAt(x)); creates this compile time error: The name 'x' does not exist in the current context which I expect.

问题 Why does my parameter x behave so erratically? Example 1 - Doesn't exist in the current context. Example 2 - Cannot reuse x because it's defined in a 'child' scope. Example 3 - Fine. This is the part where I am confused. Perhaps a different 'child' scope? Example 1 : List<int> list = new List<int> { 1, 2, 3, 4, 5 }; var result = list.Where(x => x < 3); Console.Write(result.ElementAt(x)); creates this compile time error: The name 'x' does not exist in the current context which I expect.

问题 Related question: Web API action parameter is intermittently null and http://social.msdn.microsoft.com/Forums/vstudio/en-US/25753b53-95b3-4252-b034-7e086341ad20/web-api-action-parameter-is-intermittently-null Hi! I'm creating a ActionFilterAttribute in ASP.Net MVC WebAPI 4 so I can apply the attribute in action methods at the controller that we need validation of a token before execute it as the following code: public class TokenValidationAttribute : ActionFilterAttribute { public override

问题 Related question: Web API action parameter is intermittently null and http://social.msdn.microsoft.com/Forums/vstudio/en-US/25753b53-95b3-4252-b034-7e086341ad20/web-api-action-parameter-is-intermittently-null Hi! I'm creating a ActionFilterAttribute in ASP.Net MVC WebAPI 4 so I can apply the attribute in action methods at the controller that we need validation of a token before execute it as the following code: public class TokenValidationAttribute : ActionFilterAttribute { public override

问题 In my code I have an interface - lets say its called InterfaceName and its implementation called InterfaceImpl . Now when I dynamically try to obtain the InterfaceImpl using the following code: object obj = Activator.CreateInstance("ProjectName","ProjectName.Folder.InterfaceImpl"); InterfaceName in = (InterfaceName)obj; //Error pops up here I get the following error Unable to cast object of type 'System.Runtime.Remoting.ObjectHandle' to type 'ProjectName.Folder.InterfaceName'. Any suggestions

问题 Given MVC3 and Razor engine, I got _MasterLayout.cshtml @RenderSection("JavaScript", required: false) .. .. @RenderBody() .. View.cshtml with _MasterLayout.cshtml defined in _ViewStart.cshtml .. @Html.RenderAction("PartialView", "PartialController") .. PartialView.cshtml .. @section JavaScript { ........ } .. How can I make sure that JavaScript from Partial View ends up in the Master Layout section? Edit The above scenario doesn't work because the partial view doesn't have a master layout

问题 Given MVC3 and Razor engine, I got _MasterLayout.cshtml @RenderSection("JavaScript", required: false) .. .. @RenderBody() .. View.cshtml with _MasterLayout.cshtml defined in _ViewStart.cshtml .. @Html.RenderAction("PartialView", "PartialController") .. PartialView.cshtml .. @section JavaScript { ........ } .. How can I make sure that JavaScript from Partial View ends up in the Master Layout section? Edit The above scenario doesn't work because the partial view doesn't have a master layout

问题 Given MVC3 and Razor engine, I got _MasterLayout.cshtml @RenderSection("JavaScript", required: false) .. .. @RenderBody() .. View.cshtml with _MasterLayout.cshtml defined in _ViewStart.cshtml .. @Html.RenderAction("PartialView", "PartialController") .. PartialView.cshtml .. @section JavaScript { ........ } .. How can I make sure that JavaScript from Partial View ends up in the Master Layout section? Edit The above scenario doesn't work because the partial view doesn't have a master layout

问题 i have a problem, when i m run my code then error is occured that "Object reference not set to an instance of an object." plz suggest me regarding that. Code protected void btn_Save_Click(object sender, EventArgs e) { string str = ("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:/Users/Geeta/Desktop/eTimeTrackLite1.mdb;Persist Security Info=False;"); OleDbConnection conn = new OleDbConnection(str); conn.Open(); string query = "insert into Employees ([EmployeeName],EmployeeCode,DeviceCode

问题 I need to get the password from the user that is logged on on Windows. I need this information as string for a Windows Forms application. is there any way of doing that with LDAP, SSO, external dll or similar? Thanks a lot! 回答1: Windows does not store the password as plain text. The password is stored hashed with NTLMv2 and therefor highly encrypted. It is not possible to reverse engineer that password or get it. As Lucax said it would be a huge security issue if every program could read the