rxjs：在我发送的第一组上获取重复的http请求

编程问答 2022-08-15

问题描述

我做了这个功能，每次迭代我有7个请求，分别发送了每个environment.dashboard.frequency时间， 但一开始，我发现我向服务器发送了14个请求，而不是7个：

    [NotSupportedException]: GetPermissionGroupTitle of type Saturn.WebUI.Core.Helpers.TitleHelper is not supported in the expression tree GetPermissionGroupTitle({document}{PermissionGroupId}).
   at MongoDB.Driver.Linq.Translators.AggregateLanguageTranslator.TranslateMethodCall(MethodCallExpression node)
   at MongoDB.Driver.Linq.Translators.AggregateLanguageTranslator.TranslateMapping(ProjectionMapping mapping)
   at MongoDB.Driver.Linq.Translators.AggregateLanguageTranslator.TranslateMapping(ProjectionMapping mapping)
   at MongoDB.Driver.Linq.Translators.AggregateLanguageTranslator.TranslateValue(Expression node)
   at MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslateProjectValue(Expression selector)
   at MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslateSelect(SelectExpression node)
   at MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslatePipeline(PipelineExpression node)
   at MongoDB.Driver.Linq.Translators.QueryableTranslator.Translate(Expression node,IBsonSerializerRegistry serializerRegistry,ExpressionTranslationoptions translationoptions)
   at MongoDB.Driver.Linq.MongoQueryProviderImpl`1.Execute(Expression expression)
   at MongoDB.Driver.Linq.MongoQueryableImpl`2.GetEnumerator()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Saturn.WebUI.Areas.Security.Controllers.PermissionSetRecordController.GetStaticPermissions(DataSourceRequest request,Guid permissionSetId) in C:\work\saturn-develop\saturn\src\Saturn.WebUI\Areas\Security\Controllers\PermissionSetRecordController.cs:line 87

解决方法

timer(0,environment.dashboard.frequency)-> dueTime = 0->不需要startWith

rxjsrxjsrxjs-observablesrxjs5rxjs6