Question

我正在尝试使用OpenRead方法并遇到下面显示的错误，我在代码和参考文献中添加了using.system.IO，如下面的屏幕截图所示？我错过了什么？如何摆脱这个错误？

    using System;
    using System.IO;
    var zipFileName = @"C:\Temp\bins-9111.tar.bz2";

    using (FileStream fileToDecompressAsStream = zipFileName.OpenRead())
    {
        string decompressedFileName = @"c:\bzip2\decompressed.txt";
        using (FileStream decompressedStream = File.Create(decompressedFileName))
        {
            try
            {
                BZip2.Decompress(fileToDecompressAsStream, decompressedStream, true);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }

错误： -

'string' does not contain a definition for 'OpenRead' and no extension method 'OpenRead' accepting a first argument of type 'string' could be found (are you missing a using directive or an assembly reference?)   ConsoleApplication2 c:\users\gnakkala\documents\visual studio 2015\Projects\ConsoleApplication2\ConsoleApplication2\Program.cs  32

Answer 1

您正在尝试在字符串对象上调用System.IO.File方法。试试这个：我将对OpenRead的调用更改为来自File Object而不是string。

var zipFileName = @"C:\Temp\bins-9111.tar.bz2";
using (System.IO.FileStream fs = System.IO.File.OpenRead(zipFileName))
 {
        string decompressedFileName = @"c:\bzip2\decompressed.txt";
        using (FileStream decompressedStream = File.Create(decompressedFileName))
        {
            try
            {
                BZip2.Decompress(fileToDecompressAsStream, decompressedStream, true);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }
    }

Answer 2

正如@Shannon Holsinger在评论中提到的"Safe assignment in condition"是OpenRead上的静态方法，而不是字符串。

var zipFileName = @"C:\Temp\bins-9111.tar.bz2";
using (FileStream fileToDecompressAsStream = System.IO.File.OpenRead(zipFileName))
{/* rest of code */}

有关详细信息，请参阅System.IO.File文档。

缺少OpenRead方法的参考

2 个答案: