Running .Net Core Application from batch script and redirecting exception

Question

NET Core Console App` from a batch script and redirect the exceptions to a file.I am also providing arguments to this script:

My script so far:

rem **calling C# solution from batch*******
@echo received from python param1:%1 , param2:%2 ,param3:%3
start "Dotnet Test" D:\adi\NET\Bench\Bench\bin\Debug\netcoreapp2.1\Bench.dll  dotnet %1 %2 %3 2>output.txt
pause

.NET Core Console App

class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(args[0]);
            if (!File.Exists(args[0])) {
                File.Create(args[0]);
            }


            if(double.TryParse(args[1],out double dbl)) {
                Console.WriteLine($"arg[1]={dbl.ToString()}");
            }
            if (int.TryParse(args[2], out int inte)) {
                Console.WriteLine($"arg[2]={inte.ToString()}");
            }

            Console.ReadLine();
            Console.WriteLine("Hello World!");
        }
    }

So far i tried with 2> for redirecting exception but it creates a 0kb file.

P.S Also i am not sure if i am correctly running the .Net Core Application.I have used:
Source: https://ss64.com/nt/start.html
START "title" [/D path] [options] "command" [parameters] ,
In our case where does dotnet command fit in? You normally start from terminal with
dotnet [appname].dll but here you place it after the path and the dll name?

Well that is how i understand you run .NET Core applicaitons using dotnet [name of dll]. — Bercovici Adrian
– Bercovici Adrian, Commented Aug 27, 2018 at 12:03
It appears that you used [name of dll] dotnet instead. Do parameters need to be preceded by --? — lit
– lit, Commented Aug 27, 2018 at 12:44

Adam Simon · Accepted Answer · 2018-08-27 16:01:15Z

5

In our case where does dotnet command fit in? You normally start from terminal with dotnet [appname].dll but here you place it after the path and the dll name?

Apart from other problems,

start "Dotnet Test" D:\adi\NET\Bench\Bench\bin\Debug\netcoreapp2.1\Bench.dll dotnet %1 %2 %3 2>output.txt

should be

start "Dotnet Test" dotnet D:\adi\NET\Bench\Bench\bin\Debug\netcoreapp2.1\Bench.dll %1 %2 %3 2>output.txt

You cannot run a DLL, you want to run dotnet to execute the code contained in the DLL.

Also i am not sure if i am correctly running the .Net Core Application.

I suspect you are trying to use start because of the misunderstanding described above. To run your app in the script, all you need is:

dotnet D:\adi\NET\Bench\Bench\bin\Debug\netcoreapp2.1\Bench.dll %1 %2 %3 2>output.txt

You only need start when you want to run your .NET Core app in a separate window, parallel to the rest of the script. This is what the command

start "Dotnet Test" dotnet D:\adi\NET\Bench\Bench\bin\Debug\netcoreapp2.1\Bench.dll %1 %2 %3 2^>output.txt

should do. I'm writing should because it should work according to this discussion but actually it won't.

I could make it work only using a workaround. I created a separate batch script runapp.cmd with the following content:

dotnet [appname].dll %1 %2 %3 2>error.txt & exit

And had start call this script:

start "Dotnet Test" runapp.cmd %1 %2 %3

answered Aug 27, 2018 at 16:01

Adam Simon

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3 Comments

Bercovici Adrian Over a year ago

I supplied the arguments in the order provided by the link ,or what i thought the link said.I myself wasn't sure if dotnet should be near the end but in that pattern isn't it in the place of "command"?

Adam Simon Over a year ago

In your snippet D:\adi\NET\Bench\Bench\bin\Debug\netcoreapp2.1\Bench.dll is in the place of "command".

T.Todua Over a year ago

getting error:

A fatal error was encountered. The library 'hostpolicy.dll' required to execute the application was not found in '.....path....'. Failed to run as a self-contained app. If this should be a framework-dependent app, add the ....path.....runtimeconfig.json file specifying the appropriate framework.

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