Blazor WebAssembly已经支持WebSockets，因此可以通过向服务器发送数据来实现SVG的实时更新。下面是一个示例：

1.在Blazor项目中添加SignalR客户端依赖项

2.创建一个服务类来处理SignalR连接和消息

public class SignalRService : IDisposable { private readonly HubConnection hubConnection; private readonly IJSRuntime jsRuntime;

public SignalRService(IJSRuntime jsRuntime)
{
    this.jsRuntime = jsRuntime;

    hubConnection = new HubConnectionBuilder()
        .WithUrl("http://localhost:5000/hub")
        .Build();

    hubConnection.On("UpdateSvg", async svg =>
    {
        await jsRuntime.InvokeVoidAsync("updateSvg", svg);
    });
}

public async Task StartAsync()
{
    await hubConnection.StartAsync();
}

public async Task StopAsync()
{
    await hubConnection.StopAsync();
}

public void Dispose()
{
    hubConnection.DisposeAsync().AsTask().Wait();
}

}

3.在Blazor组件中注入SignalR服务并使用C#或JavaScript代码更新SVG

@inject SignalRService SignalRService

@code { private ElementReference svgDiv;

protected override async Task OnInitializedAsync()
{
    await SignalRService.StartAsync();
}

public async Task UpdateSvg()
{
    // C# code
    var svgString = GetUpdatedSvgString();
    await SignalRService.SendAsync("UpdateSvg", svgString);

    // JavaScript code
    await jsRuntime.InvokeVoidAsync("updateSvg", svgString);
}

}