我对 C# 还很陌生，我已经编写了几个功能程序，但它们都是单线程应用程序。这是我的第一个多线程应用程序，我正在努力解决这个“跨线程操作无效：控制'cbLogType'从创建它的线程以外的线程访问”错误。我的应用程序在用户定义的事件日志源 (cbLogType) 中搜索 Windows 事件查看器以查找用户定义的事件 ID。我正在使用后台工作进程来完成所有工作，并且正在使用 worker.reportprogress 更新标签，但是在调试时收到上述错误。我尝试了几种 Invoke 方法，但似乎都没有解决我的错误。我也尝试过删除组合框并直接在代码中设置日志源，这在一定程度上有效，但仍然失败。我已经包含了我的代码，任何帮助将不胜感激。我怀疑我可能没有正确使用 Invoke 方法。提前致谢！代码：
private void bgWorker1_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker worker = sender as BackgroundWorker;
{
if (File.Exists(@"C:\Events.log"))
MessageBox.Show("File 'Events.log' already exists. All new data will be appended to the log file!", "Warning!");
string message = string.Empty;
string eventID = (tbEventID.Text);
string text;
EventLog eLog = new EventLog();
Invoke((MethodInvoker)delegate() { text = cbLogType.Text; });
eLog.Source = (this.cbLogType.Text); // I am receiving the error here
eLog.MachineName = ".";
int EventID = 0;
string strValue = string.Empty;
strValue = tbEventID.Text.Trim();
//string message = string.Empty;
EventID = Convert.ToInt32(strValue); // Convert string to integer
foreach (EventLogEntry entry in eLog.Entries)
{
int entryCount = 1;
if (cbDateFilter.Checked == true)
{
if (entry.TimeWritten > dtPicker1.Value && entry.TimeWritten < dtPicker2.Value)
if (entry.InstanceId == EventID)
message = "Event entry matching " + (tbEventID.Text) + " was found in " + (cbLogType.Text);
using (StreamWriter writer = new StreamWriter(@"C:\Events.log", true))
writer.WriteLine("EventID: " + entry.InstanceId +
"\r\nDate Created: " + entry.TimeWritten +
"\r\nEntry Type: " + entry.EntryType +
"\r\nMachinename: " + entry.MachineName +
"\r\n" +
"\r\nMessage: " + entry.Message +
"\r\n");
if (entry.InstanceId != EventID)
message = "No event ids matching " + (tbEventID.Text) + " was found in " + (cbLogType.Text);
}
else
{
if (cbDateFilter.Checked == false)
{
if (entry.InstanceId == EventID)
using (StreamWriter writer = new StreamWriter(@"C:\Events.log", true))
writer.WriteLine("EventID: " + entry.InstanceId +
"\r\nDate Created: " + entry.TimeWritten +
"\r\nEntry Type: " + entry.EntryType +
"\r\nMachinename: " + entry.MachineName +
"\r\n" +
"\r\nMessage: " + entry.Message +
"\r\n");
else if (entry.InstanceId != EventID)
message = "No event ids matching " + (tbEventID.Text) + " was found in " + (cbLogType.Text);
}
bgWorker1.ReportProgress((entryCount) * 10, message);
entryCount++;
}
}
}
}
private void bgWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
lblStat.Text = e.UserState.ToString();
}