C# &引用；无法强制转换类型为'；System.String'；输入'；工资单.EIR'&引用；

好的，我有一个类“EIR”，它是基于其基类“ExpenseReport”的列表，如下所示：

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我如何将iRost转换到Payroll.EIR，这是一个类？有没有办法将序列化字符串转换为类？

您的问题已经出现在

WriteToFile

函数中，您实际上是在序列化文件名而不是类。我没有试过，但这应该有用：

public void WriteToFile(string filename)
{
    try
    {
        BinaryFormatter formatter = new BinaryFormatter();
        FileStream stream = new FileStream(filename, FileMode.Create, FileAccess.Write, FileShare.None); // filename parameter instead of fixed path
        formatter.Serialize(stream, this); // class instance instead of filename parameter
        stream.Close();
    }
    catch (Exception ex)
    {
        Console.WriteLine("Unable to serialize Expenses: {0}", ex.Message);
    }
}

public static EIR ReadFromFile(string filename)
{
    EIR iRost = new EIR();
    try
    {
        BinaryFormatter formatter = new BinaryFormatter();
        FileStream stream = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read); // filename parameter instead of fixed path
        iRost = (EIR)formatter.Deserialize(stream);
    }
    catch (Exception ex)
    {
        Console.WriteLine("Unable to deserialize Expenses: {0}", ex.Message);
    }

    return iRost;            
}            

---

您确定静默捕获所有异常并只向控制台写入消息是一个好主意吗？

格式化程序。序列化（流，文件名）

爆炸式的爆炸！哇！这只是其中一件非常明显的事情，但我非常确定这是在反序列化方法中发生的。。。谢谢

try
        {
            EIR expensesUpdated = EIR.ReadFromFile("D:\\myExpensesUpdated.bin");
            foreach (var e in expensesUpdated) Console.WriteLine("Updated: {0}", e.ToString());
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
    }

public void WriteToFile(string filename)
{
    try
    {
        BinaryFormatter formatter = new BinaryFormatter();
        FileStream stream = new FileStream(filename, FileMode.Create, FileAccess.Write, FileShare.None); // filename parameter instead of fixed path
        formatter.Serialize(stream, this); // class instance instead of filename parameter
        stream.Close();
    }
    catch (Exception ex)
    {
        Console.WriteLine("Unable to serialize Expenses: {0}", ex.Message);
    }
}

public static EIR ReadFromFile(string filename)
{
    EIR iRost = new EIR();
    try
    {
        BinaryFormatter formatter = new BinaryFormatter();
        FileStream stream = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read); // filename parameter instead of fixed path
        iRost = (EIR)formatter.Deserialize(stream);
    }
    catch (Exception ex)
    {
        Console.WriteLine("Unable to deserialize Expenses: {0}", ex.Message);
    }

    return iRost;            
}