[英]SignalR - Client connection closes straight after starting - InvalidOperationException: Sequence contains no elements
I have aa SignalR client which seems to close straight after starting, the error message i get is:我有一个 SignalR 客户端,它似乎在启动后立即关闭,我得到的错误消息是:
"The server closed the connection with the following error: Connection closed with an error. InvalidOperationException: Sequence contains no elements" “服务器关闭连接,出现以下错误:连接关闭,出现错误。InvalidOperationException:序列不包含元素”
The SignalR client is being used in a ASP.Net Core Web API project (within an API controller). SignalR 客户端用于 ASP.Net Core Web API 项目(在 API 控制器内)。
The Nuget package i am using is called Microsoft.AspNetCore.SignalR.Client (v 1.1.0)我使用的 Nuget 包称为 Microsoft.AspNetCore.SignalR.Client (v 1.1.0)
My code looks like this:我的代码如下所示:
try
{
//SEND MESSAGE TO HUB
var connection = new HubConnectionBuilder()
.WithUrl("https://sample.azurewebsites.net/ChatHub")
.Build();
connection.Closed += async (error) =>
{
//log error - this is getting called straight after StartAsync
};
await connection.StartAsync();
await connection.InvokeAsync("SendToATeam", "x", "y");
await connection.StopAsync();
}
catch (Exception ex)
{
//log error
}
On your server you can turn on detailed errors via:在您的服务器上,您可以通过以下方式打开详细错误:
services.AddSignalR(o =>
{
o.EnableDetailedErrors = true;
})
This will then give you a more detailed error message on the client这将在客户端上为您提供更详细的错误消息
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