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c# - 为什么在不修改枚举集合时得到 "Collection was modified; enumeration operation may not execute"?

这个问题在这里已经有了答案:Howtoremoveelementsfromagenericlistwhileiteratingoverit?(28个答案)关闭9年前。我有两个字符串集合:CollectionA是系统中存储的对象的StringCollection属性,而CollectionB是运行时生成的List。如果存在任何差异,则需要更新CollectionA以匹配CollectionB。因此,我设计了一个我期望的简单LINQ方法来执行删除。varstrDifferences=CollectionA.Where(foo=>!CollectionB.Contains(foo));for

c# - "An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full"

我用C#编写了一个IP多播应用程序。它编译得很好,但在运行时这一行:sock.SetSocketOption(SocketOptionLevel.IP,SocketOptionName.AddMembership,newMulticastOption(IPAddress.Parse("224.100.0.1")));抛出未处理的套接字异常:Anoperationonasocketcouldnotbeperformedbecausethesystemlackedsufficientbufferspaceorbecauseaqueuewasfull我在Google中搜索错误,有人建议删除可

c# - "An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full"

我用C#编写了一个IP多播应用程序。它编译得很好,但在运行时这一行:sock.SetSocketOption(SocketOptionLevel.IP,SocketOptionName.AddMembership,newMulticastOption(IPAddress.Parse("224.100.0.1")));抛出未处理的套接字异常:Anoperationonasocketcouldnotbeperformedbecausethesystemlackedsufficientbufferspaceorbecauseaqueuewasfull我在Google中搜索错误,有人建议删除可

c# - 为什么我绑定(bind)的 DataGridView 会抛出 "Operation not valid because it results in a reentrant call to the SetCurrentCellAddressCore function"错误?

将DataGridView控件绑定(bind)到绑定(bind)源时,我的应用程序出现以下错误:OperationisnotvalidbecauseitresultsinareentrantcalltotheSetCurrentCellAddressCorefunction绑定(bind)源取决于数据表。我正在从DataGridView中过滤记录。我在过滤DataGridView的地方使用了dataGridView1_CellValueChanged()事件。但是当我从当前单元格中删除数据时,出现了这个错误。我该如何解决这个问题? 最佳答案

c# - 为什么我绑定(bind)的 DataGridView 会抛出 "Operation not valid because it results in a reentrant call to the SetCurrentCellAddressCore function"错误?

将DataGridView控件绑定(bind)到绑定(bind)源时,我的应用程序出现以下错误:OperationisnotvalidbecauseitresultsinareentrantcalltotheSetCurrentCellAddressCorefunction绑定(bind)源取决于数据表。我正在从DataGridView中过滤记录。我在过滤DataGridView的地方使用了dataGridView1_CellValueChanged()事件。但是当我从当前单元格中删除数据时,出现了这个错误。我该如何解决这个问题? 最佳答案

c# - 系统.Net.WebException : The operation has timed out

我有一个大问题:我需要一次发送200个对象并避免超时。while(true){NameValueCollectiondata=newNameValueCollection();data.Add("mode",nat);using(varclient=newWebClient()){byte[]response=client.UploadValues(serverA,data);responseData=Encoding.ASCII.GetString(response);string[]split=Javab.Split(new[]{'!'},StringSplitOptions.Re

c# - 系统.Net.WebException : The operation has timed out

我有一个大问题:我需要一次发送200个对象并避免超时。while(true){NameValueCollectiondata=newNameValueCollection();data.Add("mode",nat);using(varclient=newWebClient()){byte[]response=client.UploadValues(serverA,data);responseData=Encoding.ASCII.GetString(response);string[]split=Javab.Split(new[]{'!'},StringSplitOptions.Re

c# - ASP.NET Controller : An asynchronous module or handler completed while an asynchronous operation was still pending

我有一个非常简单的ASP.NETMVC4Controller:publicclassHomeController:Controller{privateconststringMY_URL="http://smthing";privatereadonlyTasktask;publicHomeController(){task=DownloadAsync();}publicActionResultIndex(){returnView();}privateasyncTaskDownloadAsync(){using(WebClientmyWebClient=newWebClient())ret

c# - ASP.NET Controller : An asynchronous module or handler completed while an asynchronous operation was still pending

我有一个非常简单的ASP.NETMVC4Controller:publicclassHomeController:Controller{privateconststringMY_URL="http://smthing";privatereadonlyTasktask;publicHomeController(){task=DownloadAsync();}publicActionResultIndex(){returnView();}privateasyncTaskDownloadAsync(){using(WebClientmyWebClient=newWebClient())ret

c# - Web API + HttpClient : An asynchronous module or handler completed while an asynchronous operation was still pending

我正在编写一个使用ASP.NETWebAPI代理一些HTTP请求的应用程序,我正在努力识别间歇性错误的来源。这似乎是一个竞争条件...但我不完全确定。在详细介绍之前,先介绍应用程序的一般通信流程:Client向Proxy1发出HTTP请求。代理1将HTTP请求的内容转发给代理2代理2将HTTP请求的内容中继到目标Web应用程序目标Web应用响应HTTP请求并将响应流式传输(分block传输)到代理2Proxy2将响应返回给Proxy1,后者又响应原始调用Client。代理应用程序是使用.NET4.5在ASP.NETWebAPIRTM中编写的。执行中继的代码如下所示://Controll