Blazor Server应用程序中，全局记录未处理的异常是很重要的。一种简单的方法是在App.cs文件中实现IUnhandledExceptionLogger接口，并覆盖其中的方法。例如：

public class App : Microsoft.AspNetCore.Components.Server.Circuits.CircuitHandler
{
    private readonly ILogger _logger;

    public App(ILogger logger)
    {
        _logger = logger;
    }

    protected override Task OnConnectionDownAsync(Circuit circuit, CancellationToken cancellationToken)
    {
        _logger.LogInformation("Client disconnected");
        return base.OnConnectionDownAsync(circuit, cancellationToken);
    }

    protected override Task OnConnectionUpAsync(Circuit circuit, CancellationToken cancellationToken)
    {
        _logger.LogInformation("Client connected");
        return base.OnConnectionUpAsync(circuit, cancellationToken);
    }

    protected override Task OnCircuitClosedAsync(Circuit circuit, CancellationToken cancellationToken)
    {
        _logger.LogInformation("Circuit closed: {CircuitId}", circuit.Id);
        return base.OnCircuitClosedAsync(circuit, cancellationToken);
    }

    protected override Task OnCircuitOpenedAsync(Circuit circuit, CancellationToken cancellationToken)
    {
        _logger.LogInformation("Circuit opened: {CircuitId}", circuit.Id);
        return base.OnCircuitOpenedAsync(circuit, cancellationToken);
    }

    protected override async Task OnConnectionUpAsync(Circuit circuit,
        CancellationToken cancellationToken)
    {
        var status = await base.OnConnectionUpAsync(circuit, cancellationToken);

        try
        {
            _logger.LogInformation("Handling connection up");
            // todo: handle connection up here
            return status;
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error handling connection up");
            return ConnectionStatus.Disconnected;
        }
    }

    protected override async Task OnConnectionDownAsync(Circuit circuit, bool stopCalled,
        CancellationToken cancellationToken)
    {
        try
        {
            _logger.LogInformation("Handling connection down");
            // todo: handle connection down here
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error handling connection down");
        }

        await base.OnConnectionDownAsync(circuit, stopCalled, cancellationToken);
    }

    protected override async Task DisposeAsync(bool disposing)
    {
        try
        {
            _logger.LogInformation("Cleaning up app resources");
            // todo: perform app cleanup here
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "Error cleaning up app resources");
        }

        await base.DisposeAsync(disposing);
    }

    protected override async Task OnUnhandledExceptionAsync(ConnectionContext connection, Exception exception)
    {
        // todo: handle the exception here
        _logger.LogError(exception, "Unhandled exception occurred during execution");
    }
}

在这个示例中，我们覆盖了多个方法来执行各种操作，以及一个OnUnhandledExceptionAsync方法来处理在执行期间发生的未处理异常。这些方法可能需要具体实现以适应您的应用程序。

最后，需要将App.cs注册到启动类中。在Startup.ConfigureServices方法中添加以下行：

services.AddSingleton();

这样，我们就