问题描述
在下面的代码中我有一个监视器，看看文件是否已更改，如果它已更改我显示在窗体上更改的信息，但如果我使用form.Show（）为此冻结，但form.showDialog ）工作正常，这两者之间的区别和如何确定使用哪一个
In the following piece of code I have a watcher that look if file has changed and if it has changed I show the changed information on a form but if i use form.Show() for this it freezes but form.showDialog() works fine, what is the difference between these two and how to determine which one to use
private void watcher_Changed(object sender, FileSystemEventArgs e)
{
_watcher.EnableRaisingEvents = false;
try
{
if (_displayPatientInfo != null)
{
_displayPatientInfo.Dispose();
}
GetPatientInfo(e.FullPath);
using (StreamReader sr = new StreamReader(e.FullPath, Encoding.Default))
{
String line;
line = sr.ReadToEnd();
if (line.IndexOf("<IsPatientFixed>") > 0)
{
var value = GetTagValue(line, "<IsPatientFixed>", "</IsPatientFixed>");
if (value == "true" || value == "True")
{
_displayPatientInfo = new frmPatientInfoDisplay();
_displayPatientInfo.SetData(_patientInfo);
_displayPatientInfo.ShowDialog();
}
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
finally
{
_watcher.EnableRaisingEvents = true;
}
}
推荐答案
@Habib说当你调用ShowDialog（）的代码之后，这个不执行，直到你关闭窗体，你的观察者会被卡住。
As @Habib said when you call ShowDialog() the code after this is not executed until you close the form and your watcher will be stuck.
你的问题是，运行在不同的线程然后你的主要形式，这就是为什么当你调用Show（）它会冻结你的应用程序，因为它试图访问的一部分内存是由你的主线程拥有的。
要解决这个问题，你可以使用Invoke（Delegate）来显示或者配置_displayPatientInfo表单。
Your problem is that the watcher is running on a different thread then your main form, that's why when you call Show() it will freeze your application because it's trying to access a portion of memory that is owned by your main thread.To fix this you can use Invoke(Delegate) when you want to show or dispose _displayPatientInfo form.
Executes the specified delegate on the thread that owns the control's underlying window handle.
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