无法访问静态背景下非静态方法？ [英] Cannot access non-static method in static context?

问题描述

...

public class CalibrationViewModel : ViewModelBase
{
    private FileSystemWatcher fsw;

    public CalibrationViewModel(Calibration calibration)
    {
        fsw = new FileSystemWatcher
            {
                Path = @"C:\Users\user\Desktop\Path\ToFile\Test_1234.txt",
                Filter = @"Test_1234.txt",
                NotifyFilter = NotifyFilters.LastWrite
            };

        fsw.Changed += (o, e) =>
            {
                var lastLine = File.ReadAllLines(e.FullPath).Last();
                Dispatcher.BeginInvoke((Action<string>) WriteLineToSamplesCollection, lastLine); //line that cites error
            };
    }

    private void WriteLineToSamplesCollection(string line)
    {
        // do some work
    }
}

为什么我得到错误，不能访问非静态方法的BeginInvoke在静态情况下'？

Why am I getting the error, 'Cannot access non-static method BeginInvoke in static context'?

我已经看了看SE其他几个例子，最举试图用一个字段创建对象之前，如果他们试图以静态方式使用非静态字段，但我不不懂它是什么我的代码被调用同样的错误。

I have looked at several other examples on SE and most cite trying to use a field before the object is created as if they were trying to use a non-static field in a static manner, but I don't understand what it is about my code that is invoking the same error.

最后，我能做些什么来解决这个具体问题/代码？

Lastly, what can I do to fix this specific issue/code?

更新：修正标题反映问题，以法而不是财产。我还补充说，类实现ViewModelBase。

Update: Fixed title to reflect issue with a 'method' and not a 'property'. I also added that the class implements ViewModelBase.

推荐答案

如果这是WPF， System.Windows.Threading程序.Dispatcher 没有一个静态的BeginInvoke（）方法。

If this is WPF, System.Windows.Threading.Dispatcher does not have a static BeginInvoke() method.

如果你想来调用静态（这是，无需分发程序实例本身的引用），你可以使用静态 Dispatcher.CurrentDispatcher 属性：

If you want to call that statically (this is, without having a reference to the Dispatcher instance itself), you may use the static Dispatcher.CurrentDispatcher property:

Dispatcher.CurrentDispatcher.BeginInvoke(...etc);

要知道，虽然，从后台线程这样做会引用不返回UI线程的调度程序，而是创建一个说后台线程关联的新调度实例。

Be aware though, that doing this from a background thread will NOT return a reference to the "UI Thread"'s Dispatcher, but instead create a NEW Dispatcher instance associated with the said Background Thread.

一个访问更安全的方式UI线程的调度员可通过使用 System.Windows.Application.Current 静态属性的：

A more secure way to access the "UI Thread"'s Dispatcher is via the use of the System.Windows.Application.Current static property:

Application.Current.Dispatcher.BeginInvoke(...etc);

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