发生System.ArgumentException [英] System.ArgumentException occurred

问题描述

我的行为很奇怪.这是代码:

I'm getting a strange behavior. This is the code:

...
private Object lockobj = new Object();
private Dictionary<String, BasicTagBean> toVerifyTags = null;

public void verifyTags(List<BasicTagBean> tags)
{
    System.Diagnostics.Debug.WriteLine("Thread ID: " + Thread.CurrentThread.ManagedThreadId);
    lock (lockobj)
    {
        foreach (BasicTagBean tag in tags)
        {
            if (!alreadyVerified.ContainsKey(tag.EPC))
            {
                toVerifyTags.Add(tag.EPC, tag);
            }
        }
    }
...

有时候我遇到了例外情况

Sometimes I got this exception

'System.ArgumentException' occurred in mscorlib.dll

此行代码:

toVerifyTags.Add(tag.EPC, tag);

该异常指的是将一个已经存在的元素错误地添加到集合中，但是我对此进行了检查.可能是线程问题，但应用程序输出始终显示相同的线程ID.我正在使用C#Pocketpc版本3.5.

the exception refer to wrong add of an already existing element into collection, but I check this. Maybe a thread problem but application output shows always the same thread id. I'm using c# pocketpc version 3.5.

推荐答案

该异常似乎告诉您您要添加到toVerifyTags中的密钥已经存在.您并没有检查密钥是否已在正确的字典中存在.

The exception seems to tell you that the key you are trying to add in toVerifyTags already exists. You weren't checking if the key already existed in the right dictionary.

public void verifyTags(List<BasicTagBean> tags)
{
    System.Diagnostics.Debug.WriteLine("Thread ID: " + Thread.CurrentThread.ManagedThreadId);
    lock (lockobj)
    {
        foreach (BasicTagBean tag in tags)
        {
            if (!toVerifyTags.ContainsKey(tag.EPC))
            {
                toVerifyTags.Add(tag.EPC, tag);
            }
        }
    }

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