Log exception to file in c# .net core application explained

In production environment when any bug gets reported at that time as developer wants to get the exception details of bug to resolve the issue on high priority.
In some case there might be situation where exception is not logged in table but developer wants to check the bug immediately. for that purpose we need to write the
exception details including stack trace of bug in file. To implement this easily i am going to demonstrate the implementation of custom logging in file as below.

First we need to construct the exception and logger method in custom logger class as shown below.

public class CustomLogger { public static List<string> ConstructExceptionDetails(Exception ex,string FunctionName) { return new List<string>() { $"{DateTime.Now} - {FunctionName}", $"Exception: {ex.Message}", $"StackTrace: {ex.StackTrace}", $"InnerException: {ex.InnerException?.…

All about tempdata in Asp.Net MVC

TempData in ASP.NET MVC is basically a dictionary object derived from TempDataDictionary. TempData stays for a subsequent HTTP Request as opposed to other options (ViewBag and ViewData) those stay only for current request. So, TempData can be used to maintain data between controller actions as well as redirects.

Note: Just like ViewData, typecasting and null checks required for TempData also in order to avoid errors.

Let’s see how we can use TempData in a practical scenario to pass data from one controller action to another.

 //Controller Action 1 (TemporaryEmployee)
 public ActionResult TemporaryEmployee()
                Employee employee = new Employee
                        EmpID = "121",
                        EmpFirstName = "Imran",
                        EmpLastName = "Ghani"
                TempData["Employee"] = employee;
                return RedirectToAction("PermanentEmployee");

 //Controller Action 2(PermanentEmployee)
 public ActionResult PermanentEmployee()
               Employee employee = TempData["Employee"] as Employee;
               return View(employee);

  • “TempData” will be persisted depending on 4 CONDITIONS:
  1. Not Read
  2. Normal Read
  3. Read and Keep
  4. Peek and Read

Condition 1 (Not read): If you set a “TempData” inside your action and if you do not read it in your view, then “TempData” will be persisted for the next request.

Condition 2 (Normal Read): If you read the “TempData” normally like the below code, it will not persist for the next request.

stringstr = TempData["MyData"];

Even if you are displaying, it’s a normal read like the code below:


Condition 3 (Read and Keep): If you read the “TempData” and call the “Keep” method, it will be persisted.


Condition 4 ( Peek and Read): If you read “TempData” by using the “Peek” method, it will persist for the next request.

stringstr = TempData.Peek("Td").ToString();


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