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Collection was modified; enumeration operation may not execute. C# [duplicate]

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问题 This question already has answers here : How to remove elements from a generic list while iterating over it? (26 answers) Closed 6 years ago . I need help. I am working with an arraylist, and suddenly I get this error. An unhandled exception of type 'System.InvalidOperationException' occurred in mscorlib.dll Additional information: Collection was modified; enumeration operation may not execute. This is the code where it shows the exception... foreach (PC_list x in onlinelist) { if ((nowtime

Collection was modified; enumeration operation may not execute. C# [duplicate]

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How to get the name of calling bat script

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问题 I need to have my 2.bat script behaviour depending on the name of calling script. Scenario: 2.bat is invoked from many other external scripts, which I am not entitled to change. Only 2.bat is under my thumb. 1.bat : ... call 2.bat 2.bat : ...here place something extracting "1.bat"... 回答1: As you cant change the calling bat there will be almost impossible to get its name if it is triggered through the cmd console (may be a memory dump could help?) as then the ProcessId will hold information

How to get the name of calling bat script

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What does 'InvokeRequired' and 'Invoke' mean in .Net?

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问题 I have been working a lot with threading in a few programs I am working on, and I have always been curious as to what exactly something is doing. Take for instance the following code, which is ran from a thread to update the UI: Public Sub UpdateGrid() If Me.InvokeRequired Then Me.Invoke(New MethodInvoker(AddressOf UpdateGrid)) Else DataGridView1.DataSource = dtResults DataGridView1.Refresh() btnRun.Text = "Run Query" btnRun.ForeColor = Color.Black End If End Sub What exactly does the Me

Java 反射调用静态方法

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专栏原创出处： github-源笔记文件， github-源码，欢迎 Star，转载请附上原文出处链接和本声明。 Java 核心知识专栏系列笔记，系统性学习可访问个人复盘笔记-技术博客 Java 核心知识一、使用 java.lang.reflect 包的 Method#invoke 调用关键代码： Object invoke = method.invoke(null, Object... args) ,从底层方法被调用的对象设置为 null 即可。 public class ReflectExample { public static String stringStaticMethod ( String s ) { return s + "|" + s ; } public static void main ( String [ ] args ) throws Throwable { Method method = ReflectExample . class . getDeclaredMethod ( "stringStaticMethod" , String . class ) ; Object invoke = method . invoke ( null , "invoke" ) ; // obj 传 null System . out . println (

Windows Forms: Is there a way to wait for all pending Invokes to a Control to end?

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问题 I need to do this in order to solve a deadlock. My Windows Forms Control has a reference to a C++/CLI class which wraps a C++ native class. The native class makes callbacks to the C++/CLI class, which maps them to events handled by the form. These callbacks are called from a thread which runs all the time. When I want to dispose the control, I unregister all events, so that the native class can't call back anymore. Once that's done, I dispose the C++/CLI wrapper, which in turn destroys the

Why would anyone want to use Invoke() (not BeginInvoke())?

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问题 I was told that Invoke() is similar to normal method calling... so why would people choose to use Invoke and not normal method calling? I tried to search online regarding the issue, what i get is the advantages of using BeginInvoke(), but what are the advantages of using Invoke()? 回答1: Use BeginInvoke when you want to call the delegate asynchronously (on a thread drawn from the thread pool) and Invoke if you want to call it synchronously. 回答2: It's worth noting first that we have to have

Why does VS2010 always break on exception from MethodInfo.Invoke?

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问题 I have a try/catch around a MethodInfo.Invoke(o,null), and VS2010 is set to never break on Exceptions, but unfortunately the debugger continues to break inside the Invoked method. The method is static, and I've got the Phone Developer Beta installed. Is this a bug or developer error? Thx!! 回答1: Yes, with every exception check-box is un-checked it breaks on only these Invoke exceptions. All the other exceptions work fine. The great news is that an anonymous genius gave me a work-around:

How to get PowerShell to wait for Invoke-Item completion?

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问题 How do I get PowerShell to wait until the Invoke-Item call has finished? I'm invoking a non-executable item, so I need to use Invoke-Item to open it. 回答1: Unfortunately you can't by using the Invoke-Item Commandlet directly. This command let has a void return type and no options that allow for a wait. The best option available is to define your own function which wraps the Process API like so function Invoke-Command() { param ( [string]$program = $(throw "Please specify a program" ), [string]