问题标签 [targetinvocationexception]

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c# - BackgroundWorker ReportProgress 抛出 TargetInvocationException

我正在尝试创建一个工具来从多个 .txt 文件中搜索数据。我想为用户创建一个进度条来跟踪工作的进度。这就是我得到的

当我添加行时:

它抛出异常:

我尝试使用 Ivoke,但它仍然抛出此异常:

你能告诉我哪里错了吗?