How to rethrow an InnerException in C# without losing the stack trace?

In C#, throw is a keyword. It is useful to manually throw exceptions during program execution. We can use try-catch blocks as needed to handle these thrown exceptions. .

By using the throw keyword in the catch block, we can rethrow the exception handled in the catch block. Rethrowing exceptions is useful when we want to pass the exception to the caller to handle it the way they want.

The following is an example of using the throw keyword to rethrow an exception to the caller using a try-catch block in C#.

Example

class Program{ static void Main(string[] args){ try{ Method2(); } catch (System.Exception ex){ System.Console.WriteLine($"{ex.StackTrace.ToString()} {ex.Message}"); } Console.ReadLine(); } static void Method2(){ try{ Method1(); } catch (System.Exception){ throw; } } static void Method1(){ try{ throw new NullReferenceException("Null Exception error"); } catch (System.Exception){ throw; } } }

This is how we can rethrow the exception to the caller as needed using the throw keyword in the catch block.

Output

at DemoApplication.Program.Method1() in C:\Users\Koushik\Desktop\Questions\ConsoleApp\Program.cs:line 49 at DemoApplication.Program.Method2() in C:\Users\Koushik\Desktop\Questions\ConsoleApp\Program.cs:line 37 at DemoApplication.Program.Main(String[] args) in C:\Users\Koushik\Desktop\Questions\ConsoleApp\Program.cs:line 24 Null Exception error

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