Using OnReadyToShow to display the main window in Blazor does not seem to work with Show set to false #438

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claunia · 2026-01-29T16:39:41Z

claunia commented

2026-01-29 16:39:41 +00:00

Originally created by @Dotneteer on GitHub (Jan 4, 2020).

Originally assigned to: @GregorBiswanger on GitHub.

ElectronNET version: 7.30.2
.NET Core 3.0.1 (produces the same issue with v3.1.0)

(project that reproduces the behavior is attached)

BlazorOnReadyToShowIssue.zip

Create an ElectronNET based Blazor project with the standard steps

mkdir BlazorOnReadyIssue
cd BlazorOnReadyIssue
dotnet new blazorserver --no-https
dotnet add package ElectronNET.API
dotnet new tool-manifest
dotnet tool install ElectronNET.CLI
dotnet electronize init
Set up Program.cs:

// ...
public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webBuilder =>
        {
             webBuilder
                 .UseStartup<Startup>()
                 .UseElectron(args);  // --- Added this
        });
// ...

Set up Startup.cs:

// --- At the end of Configure
// ...
Task.Run(async () =>
{
    var browserWindow = await Electron.WindowManager.CreateWindowAsync(
        new BrowserWindowOptions
        {
            Title = "OnReadyToShow",
            Width = 1152,
            Height = 864,
            Show = false // --- When set to true, project works properly
        });
    browserWindow.OnReadyToShow += () => browserWindow.Show();
});

Run the project (either with Ctrl+F5 or electronize start)

Expected behavior: The Electron Shell window is displayed with the Blazor App.

Issue: The Electron Shell window does not display.

Whenever I change the Show property of BrowserWindopOptions to true, the project works fine, but, of course, for a few seconds an empty page is displayed according to the normal behavior.

Originally created by @Dotneteer on GitHub (Jan 4, 2020). Originally assigned to: @GregorBiswanger on GitHub. ElectronNET version: 7.30.2 .NET Core 3.0.1 (produces the same issue with v3.1.0) *(project that reproduces the behavior is attached)* [BlazorOnReadyToShowIssue.zip](https://github.com/ElectronNET/Electron.NET/files/4021717/BlazorOnReadyToShowIssue.zip) Create an ElectronNET based Blazor project with the standard steps 1. `mkdir BlazorOnReadyIssue` 2. `cd BlazorOnReadyIssue` 3. `dotnet new blazorserver --no-https` 4. `dotnet add package ElectronNET.API` 5. `dotnet new tool-manifest` 6. `dotnet tool install ElectronNET.CLI` 7. `dotnet electronize init` 8. Set up `Program.cs`: ```csharp // ... public static IHostBuilder CreateHostBuilder(string[] args) => Host.CreateDefaultBuilder(args) .ConfigureWebHostDefaults(webBuilder => { webBuilder .UseStartup<Startup>() .UseElectron(args); // --- Added this }); // ... ``` 9. Set up `Startup.cs`: ```csharp // --- At the end of Configure // ... Task.Run(async () => { var browserWindow = await Electron.WindowManager.CreateWindowAsync( new BrowserWindowOptions { Title = "OnReadyToShow", Width = 1152, Height = 864, Show = false // --- When set to true, project works properly }); browserWindow.OnReadyToShow += () => browserWindow.Show(); }); ``` 10. Run the project (either with Ctrl+F5 or `electronize start`) **Expected behavior**: The Electron Shell window is displayed with the Blazor App. **Issue**: The Electron Shell window does not display. ![VsDebugConsole_mpnXKwDexe](https://user-images.githubusercontent.com/4783390/71763338-33344300-2edb-11ea-8321-f3624ee3758f.png) ![Taskmgr_5k2ICKnU0m](https://user-images.githubusercontent.com/4783390/71763340-3deed800-2edb-11ea-800b-ef9888b8463c.png) Whenever I change the `Show` property of `BrowserWindopOptions` to `true`, the project works fine, but, of course, for a few seconds an empty page is displayed according to the normal behavior.

claunia added the bug label 2026-01-29 16:39:41 +00:00

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Reference: starred/Electron.NET#438