如何正确实现idisposable（c＃）？

问题描述

我运行Analyze>在我的C＃Winforms应用程序上运行代码分析解决方案。我得到了这个：



CA1001拥有一次性字段的类型应该是一次性的，可以在'ExceptionLoggingService'上实现IDisposable，因为它创建了以下IDisposable类型的成员：'StreamWriter 。如果先前已经发布了'ExceptionLoggingService'，那么将实现IDisposable的新成员添加到此类型将被视为对现有消费者的重大改变。



什么我试过了：



所以我加了它：

I ran Analyze > Run Code Analysis on Solution on my C# Winforms app. I got this:

CA1001Types that own disposable fields should be disposableImplement IDisposable on 'ExceptionLoggingService' because it creates members of the following IDisposable types: 'StreamWriter'. If 'ExceptionLoggingService' has previously shipped, adding new members that implement IDisposable to this type is considered a breaking change to existing consumers.

What I have tried:

So I added it:

public class ExceptionLoggingService : IDisposable
{
	. . .

	public void Dispose()
        {
            _streamWriter.Dispose();
        }
        . . .

...但是运行Analyze>在解决方案上运行代码分析再次给我以下指纹：



CA1063正确实现IDisposable在'ExceptionLoggingService'上提供Dispose（bool）的可覆盖实现或标记密封的类型。对Dispose（false）的调用应该只清理本机资源。调用Dispose（true）应该清理托管和本机资源。





那我该怎么做安抚野兽？

...but running Analyze > Run Code Analysis on Solution again gives me the following fingerwag:

CA1063Implement IDisposable correctlyProvide an overridable implementation of Dispose(bool) on 'ExceptionLoggingService' or mark the type as sealed. A call to Dispose(false) should only clean up native resources. A call to Dispose(true) should clean up both managed and native resources.


So what must I do to appease the beast?

推荐答案

public void Dispose()
{
    Dispose(true);
    GC.SuppressFinalize(this);
}

protected virtual void Dispose(bool disposing)
{
    if (disposing)
    {
        if (_streamWriter != null) _streamWriter.Dispose();
    }
}

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