c# - react X : Catching exceptions on Observable as lambda expression

Question

我有这样的观察:

public class NetworkToolEngine
{
    public NetworkToolEngine()
    {            
        this.connectionAvailable = Observable
            .Interval(TimeSpan.FromSeconds(5))
            .Select(_ => true);
    }
}

static class Program
{
    static void Main()
    {
        NetWorkToolEngine networkToolEngine = new NetworkToolEngine();
        this.networkToolEngine.ConnectionAvailable
            .Do(_ => this.ConnectionAvailable())
            .Catch(ex =>    //<<<<<1>>>>>
            {
                this.ConnectionUnavailable();
                return Observable.Empty<bool>();
            });
    }

目前；我在 <<<<<1>>>>> 处收到此编译错误:

Cannot convert lambda expression to type 'IObservable' because it is not a delegate type

有什么想法吗？

Answer 1

这是因为 catch 存在多个重载，并且您没有指定 ex 的类型 - 它会选择错误的类型。你需要这样做:

.Catch((Exception ex) =>    //<<<<<1>>>>>
{
    this.ConnectionUnavailable();
    return Observable.Empty<bool>();
});