<Question>Output Console.WriteLine

[H1Gdev]

• .NET Core Version:

netcoreapp3.1

• Have you experienced this same bug with .NET Framework?:

No

Problem description:

WindowsFormsApp1.csproj

<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">

  <PropertyGroup>
    <OutputType>WinExe</OutputType>
    <TargetFramework>netcoreapp3.1</TargetFramework>
    <UseWindowsForms>true</UseWindowsForms>
  </PropertyGroup>

</Project>

Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            Console.WriteLine("TEST");    // Add only this line.
        }

    }
}

Expected behavior:

• TEST is output to OUTPUT. (Like .Net Framework Forms app)

Please tell me how to output string to OUTPUT.

Minimal repro:

1. use Microsoft Visual Studio Community 2019 Version 16.8.5
2. Create Windows Forms App(.NET)
3. Add only Console.WriteLine("TEST");

[RussKie]

A console window is not shown for UI app by default. To show the console set the DisableWinExeOutputInference property to true in your project file.

<DisableWinExeOutputInference>true</DisableWinExeOutputInference>

This doc describes a workaround, and whilst it targets .NET 5.0, it also fixes the issue for .NET Core 3.1 and earlier.

[H1Gdev]

Thanks.

After changing <OutputType> and <DisableWinExeOutputInference>, console is shown.

WindowsFormsApp1.csproj

<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp3.1</TargetFramework>
    <UseWindowsForms>true</UseWindowsForms>
    <DisableWinExeOutputInference>true</DisableWinExeOutputInference>
  </PropertyGroup>

</Project>

But I want to show it in OUTPUT window of Visual Studio.(Like .Net Framework Forms app)
Do you know how to do this ?

[RussKie]

To show in VS please use Debug.WriteLine.

[H1Gdev]

Thanks !!
I will use Debug.WriteLine.