Wednesday, January 11, 2017

OnAuthorization in MVC


 public void OnAuthorization(AuthorizationContext filterContext)
        {          
            var skipAutherization = filterContext.ActionDescriptor.IsDefined(typeof(AllowAnonymousAttribute), true) ||                                filterContext.ActionDescriptor.ControllerDescriptor.IsDefined(typeof(AllowAnonymousAttribute), true);
            if (!skipAutherization)
            {
              if (SessionManagement.UserID == Guid.Empty)
               {
                   filterContext.Result = new RedirectToRouteResult(new RouteValueDictionary(new { Controller = "Account", Action = "Login" }));
                }
            }
        } 


Using above code we can restrict/authenticate the particular actions and controllers 

How to get IPAddress,Browser name and Browser Version


 var ipAddress = Request.ServerVariables["remote_addr"];  //for getting IPAddress of the User 
var userAgent = string.Format("Browser ({0}) : {1}", Request.Browser.Browser, Request.Headers["User-Agent"]);  ///will get browser name and browser version

 var hostName= Dns.GetHostEntry("ip").HostName; // will get computer name of the user 
 

Update Xml Element Using C#


           var xdoc = new XmlDocument();
            xdoc.Load(webConfigPath);
            var endpointNodes = xdoc.SelectSingleNode("/configuration/system.serviceModel/client /endpoint");
            if (endpointNodes != null)
                endpointNodes.Attributes["address"].Value = addressValue;

            xdoc.Save(webConfigPath); 

 

Read and write Xml using C#


          var xdoc = new XmlDocument();
            xdoc.Load(webConfigPath);
            var connStringnodes = xdoc.SelectSingleNode("/configuration/connectionStrings");

            if (connStringnodes != null)
            {
                if (connStringnodes.ChildNodes.Count > 0)
                {
                    var elementNodeList = xdoc.GetElementsByTagName("connectionStrings");
                    foreach (XmlNode node in elementNodeList)
                    {
                        while (node.FirstChild != null)
                            node.RemoveChild(node.FirstChild);
                    }
                }
                var addElement = xdoc.CreateElement("add");
                addElement.SetAttribute("name", "conStringname");
                addElement.SetAttribute("connectionString", connectionStringValue);
                addElement.SetAttribute("providerName", providerNameValue);
                connStringnodes.AppendChild(addElement.Clone());

            }
            xdoc.Save(webConfigPath);

Above code will Change the Connectionstring child elements... 

StringSplitOptions.RemoveEmptyEntries

string somestring = "One,,Two,,,Three,,,Four,,";
somestring.Split(new char[] { ',' },   StringSplitOptions.RemoveEmptyEntries)

StringSplitOptions.RemoveEmptyEntries- Can remove empty strings after comma seperated from the above code


500.19 - Internal Server Error


 The requested page cannot be accessed because the related  configuration data for the page is invalid.

500.19 - Internal Server Error - The requested page cannot be accessed because the related configuration data for the page is invalid..

if we get error like above we can add below lines in web.config file 
 Unsubscribe.aspx--> accessing page in my scenario.
<location path="Unsubscribe.aspx">
    <system.web>
      <authorization>
        <allow users="*"/>
      </authorization>
    </system.web>
  </location>

NetBIOS name using C#


 Environment.MachineName
 Gets the NetBIOS name of this local computer. 


Using Unit of Work in Controller


UnitOfWork unitOfWork = new UnitOfWork();
var profile = unitOfWork.ProfileRepository.Get(filter: p => p.Code == login);

in the above code filter: will work as where condition 


Model Error in MVC


ModelState.AddModelError("", "Invalid username or password."); 

How to Remove Plural table name from DbContext


 protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            Database.SetInitializer<PMContext>(null);
            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
            base.OnModelCreating(modelBuilder);            
        }

  modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();

by adding this line we can remove the plural table name from DbContext

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