Question

如何创建streamreader的克隆对象，当我在streamreader对象上进行序列化时，程序给我异常：

未处理的异常：System.Runtime.Serialization.SerializationException：Type' 在Assembly'mscorlib中的System.IO.FileStream'，Version = 4.0.0.0，Culture = neutral，未标记为可序列化。

我该怎么做？

假设我的文本文件与文本一样：

我的节目：

 [Serializable()]
class Program   
{

    static void Main(string[] args)
    {
        Program obj = new Program();
        obj.read();
    }
    void read()
    {

        StreamReader reader1 = new StreamReader(@"d:\test.txt");
        string s = reader1.ReadLine();
        Console.WriteLine(s);
       SerializeObject("text.txt", reader1);
       StreamReader reader2;
        for (int i = 0; i < 3; i++)
        {
            reader1.ReadLine();
        }
        s = reader1.ReadLine();
        Console.WriteLine(s);
        reader2 = DeSerializeObject("text.txt");
        s = reader2.ReadLine();
        Console.WriteLine(s);
    }
    public void SerializeObject(string filename, StreamReader objectToSerialize)
    {
        Stream stream = File.Open(filename, FileMode.Create);
        BinaryFormatter bFormatter = new BinaryFormatter();
        bFormatter.Serialize(stream, objectToSerialize);
        stream.Close();
    }
    public StreamReader DeSerializeObject(string filename)
    {
        StreamReader objectToSerialize;
        Stream stream = File.Open(filename, FileMode.Open);
        BinaryFormatter bFormatter = new BinaryFormatter();
        objectToSerialize = (StreamReader)bFormatter.Deserialize(stream);
        stream.Close();
        return objectToSerialize;
    }
}

我想输出必须是：

1
5
2

Answer 1

好的，所以你只是想读取一个文件并写入另一个文件。您尝试执行的操作不涉及序列化。序列化通常涉及持久化对象。

我相信这就是你所追求的：

static void Main()
{
    using(StreamReader reader = new StreamReader(@"d:\input.txt"))
    using(StreamWriter writer = new StreamWriter(@"d:\output.txt"))
    {
        string line;

        // Write 1st line
        line = reader.ReadLine();
        writer.WriteLine(line);

        // Skip 3 lines
        for (int i = 0; i < 3; i++)
        {
            reader.ReadLine();
        }

        // Write 5th & 6th line
        for (int i = 0; i < 2; i++)
        {
            line = reader.ReadLine();
            writer.WriteLine(line);
        }
    }
}

<强>更新写第一行，然后写第五行，然后写第二行：

static void Main()
{
    using(StreamReader reader = new StreamReader(@"d:\input.txt"))
    using(StreamWriter writer = new StreamWriter(@"d:\output.txt"))
    {
        string line;

        // Write first line
        line = reader.ReadLine();
        writer.WriteLine(line);

        // Read the second line
        string second = reader.ReadLine(); ;

        // Skip 3rd & 4th lines
        for (int i = 0; i < 2; i++)
        {
            reader.ReadLine();
        }

        // Write 5th line
        line = reader.ReadLine();
        writer.WriteLine(line);

        // Write the 2nd line
        writer.WriteLine(second);
    }
}

我们可以在c＃中创建streamreader类的克隆对象吗？

1 个答案: