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Handle asynchrony during app startup on WebAssembly. Fixes #8079

This commit is contained in:
Steve Sanderson 2019-03-04 10:42:03 +00:00
parent 7248ecbaf1
commit fdf7f58466
1 changed files with 13 additions and 2 deletions
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15
src/Components/Blazor/Blazor/src/Hosting/WebAssemblyHostExtensions.cs
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@ -1,6 +1,8 @@
// Copyright (c) .NET Foundation. All rights reserved. // Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information. // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
namespace Microsoft.AspNetCore.Blazor.Hosting namespace Microsoft.AspNetCore.Blazor.Hosting
{ {
/// <summary> /// <summary>
@ -19,7 +21,16 @@ namespace Microsoft.AspNetCore.Blazor.Hosting
/// </remarks> /// </remarks>
public static void Run(this IWebAssemblyHost host) public static void Run(this IWebAssemblyHost host)
{ {
host.StartAsync().GetAwaiter().GetResult(); // Behave like async void, because we don't yet support async-main properly on WebAssembly.
// However, don't actualy make this method async, because we rely on startup being synchronous
// for things like attaching navigation event handlers.
host.StartAsync().ContinueWith(task =>
{
if (task.Exception != null)
{
Console.WriteLine(task.Exception);
}
});
} }
} }
} }