无法摆脱 CA2202 警告

Question

我已阅读有关此的 MSDN 页面：https://msdn.microsoft.com/en-us/library/ms182334.aspx

还有这个 SO 答案：

但下面的代码仍然为我生成 2 个 CA2202 警告：

FileStream fileStream = null;
BufferedStream bufferedStream = null;
try
{
    fileStream = File.Open(...);
    bufferedStream = new BufferedStream(fileStream);

    using (StreamReader streamReader = new StreamReader(bufferedStream))
    {
        ...
    }
}
finally
{
    if (bufferedStream != null)
    {
        bufferedStream.Dispose();
    }

    if (fileStream != null)
    {
        fileStream.Dispose();
    }
}

"bufferedStream.Dispose()"行仍然给出以下两个警告：

Severity Code Description Project File Line Suppression State Warning CA2202 Object 'bufferedStream' can be disposed more than once in method 'Loader.UpdateIndex()'. To avoid generating a System.ObjectDisposedException you should not call Dispose more than one time on an object.: Lines: 930 Loader C:\Users\user\Loader\Loader.cs 930 Active

和

Severity Code Description Project File Line Suppression State Warning CA2202 Object 'fileStream' can be disposed more than once in method 'Loader.UpdateIndex()'. To avoid generating a System.ObjectDisposedException you should not call Dispose more than one time on an object.: Lines: 930, 935 Loader C:\Users\user\Loader\Loader.cs 930 Active

大概是因为 fileStream 可以被多次处理？但是bufferedStream怎么能不止一次的处理呢？

编辑：我已将@Damien_The_Unbeliever 的回答标记为正确。您实际上也可以 trim 它，因为正如下面某处提到的，您不需要 bufferedReader 变量。这就是我最终得到的。它有点丑，但它有效：

FileStream fileStream = null;
try
{
    fileStream = File.Open("iaushdiuh", FileMode.Open);

    fileStream = null;

    using (StreamReader streamReader = new StreamReader(fileStream))
    {
        streamReader.ReadLine();
    }
}
finally
{
    if (fileStream != null)
    {
        fileStream.Dispose();
    }
}

Answer 1

如果在将这些对象 "passed ownership" 发送给其他对象后，您不使用底层流，则可以像这样使警告静音：

        FileStream fileStream = null;
        BufferedStream bufferedStream = null;
        try
        {
            fileStream = File.Open(...);
            bufferedStream = new BufferedStream(fileStream);

            fileStream = null;

            using (StreamReader streamReader = new StreamReader(bufferedStream))
            {

                bufferedStream = null;

                ...
            }
        }
        finally
        {
            if (bufferedStream != null)
            {
                bufferedStream.Dispose();
            }

            if (fileStream != null)
            {
                fileStream.Dispose();
            }
        }

您希望对 null 的赋值在一次性对象的 "takes ownership" 构造函数调用之后立即发生。通过这种方式，您可以确保如果构造函数抛出，您将处理内部对象并且如果构造函数成功然后它将安排处置发生。

无法摆脱 CA2202 警告

Cannot get rid of CA2202 warning

c#

code-analysis

ca2202