Question

我在获取SOAP服务以反序列化对象数组时遇到问题;它唯一的读数在数组的第一个成员，没有别的。这是我的代码：

public void StoreCredentials(Credentials credentials)
    {
        Credentials[] credsArray;
        var soap = new SoapFormatter();

        var stream = new FileStream(_path, FileMode.OpenOrCreate);
        try
        {
            credsArray = (Credentials[])soap.Deserialize(stream);
            var credsList = credsArray.ToList();
            credsList.Add(credentials);
            credsArray = credsList.ToArray();
        }
        catch (SerializationException)
        {
            credsArray = new[] {credentials};
        }
        soap.Serialize(stream, credsArray);
        stream.Close();
    }

我写了一个简单的单元测试，它将两个Credentials对象添加到文件中，输出看起来正确，两组凭据都存在，但是当我运行测试将第三个集添加到文件时，soap.Deserialize（ stream）line返回一个只有一个条目的数组，即使它的读取文件包含两个条目。我在这里做错了吗？有没有更好/更简单的方法来做到这一点？请帮忙！

Answer 1

我明白了。问题在于FileStream的FileMode.OpenOrCreate属性。这将打开文件，但附加一个新集合，而不是更改原始集合。我需要使用FileMode.Create覆盖该文件，所以这里是工作代码（我也将集合更改为Hashtable，效果更好）：

public void StoreCredentials(Credentials credentials)
    {
        credentials.Encrypt(_myUser.Encryption);
        Hashtable credsTable;
        var soap = new SoapFormatter();

        FileStream stream;
        try
        {
            stream = new FileStream(_path, FileMode.Open, FileAccess.ReadWrite);
            credsTable = (Hashtable) soap.Deserialize(stream);
            stream.Close();
            stream = new FileStream(_path, FileMode.Create, FileAccess.ReadWrite);
            if (credsTable.ContainsKey(credentials.Id))
                credsTable[credentials.Id] = credentials;
            else
                credsTable.Add(credentials.Id, credentials);
        }
        catch (FileNotFoundException e)
        {
            stream = new FileStream(_path, FileMode.Create, FileAccess.ReadWrite);
            credsTable = new Hashtable {{credentials.Id, credentials}};
        }
        soap.Serialize(stream, credsTable);
        stream.Close();
    }

使用SOAP反序列化数组

1 个答案: