Question

在反序列化自定义对象时遇到此错误我试图将自定义类的集合插入到sql数据库＆amp;检索它插入顺利但检索数据＆amp;反序列化给我这个错误我的代码示例：

        private void InsertObject()
    {
        ReceiptCollection items = SqlDataRepository.ReceiptProvider.GetAll();

        string connectionString = "my connection";

        System.Data.SqlClient.SqlConnection connection = new System.Data.SqlClient.SqlConnection(connectionString);

        string sql = "INSERT INTO [dbo].[LogHeader]([MasterObject]) VALUES (@MasterObject)";

        BinaryFormatter binaryFormatter = new BinaryFormatter();
        MemoryStream memoryStream = new MemoryStream();
        binaryFormatter.Serialize(memoryStream, items);

        using (System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand(sql, connection))
        {
            byte[] bytes = new byte[memoryStream.Length];
            memoryStream.Write(bytes, 0, bytes.Length);

            connection.Open();
            cmd.Parameters.AddWithValue("@MasterObject", bytes);
            cmd.ExecuteNonQuery();
        }
    }

    private void RetrieveObjects()
    {
        string connectionString = "my connection";
        System.Data.SqlClient.SqlConnection connection = new System.Data.SqlClient.SqlConnection(connectionString);

        string sql = "Select MasterObject From [dbo].[LogHeader] WHERE LogHeaderID=2";

        using (System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand(sql, connection))
        {
            connection.Open();
            byte[] bytes = (byte[])cmd.ExecuteScalar();

            BinaryFormatter binaryFormatter = new BinaryFormatter();
            MemoryStream memoryStream = new MemoryStream(bytes);
            memoryStream.Position = 0;
            ReceiptCollection items = (ReceiptCollection)binaryFormatter.Deserialize(memoryStream); // the error happened here
        }
    }

Answer 1

我在自定义类的序列化和反序列化中遇到了同样的问题。我环顾四周，他们有相同的代码标记为解决方案（因为您的代码显示在顶部），但我无法使其正确运行。我在memoryStream.Write（）方法之后收到的是一个零数组。我改变了我的代码并让它发挥作用。

我所做的是（在您的代码中实现）：

    BinaryFormatter binaryFormatter = new BinaryFormatter();
    MemoryStream memoryStream = new MemoryStream();
    binaryFormatter.Serialize(memoryStream, items);

    using (System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand(sql, connection))
    {
        byte[] bytes = new byte[memoryStream.Capacity];
        bytes = memoryStream.GetBuffer();

        connection.Open();
        cmd.Parameters.AddWithValue("@MasterObject", bytes);
        cmd.ExecuteNonQuery();
    }

这是用于将字节数组发送到数据库。为了检索它，我做了以下事情：

    connection.Open();
    byte[] bytes = (byte[])cmd.ExecuteScalar();

    BinaryFormatter binaryFormatter = new BinaryFormatter();
    using (MemoryStream memoryStream = new MemoryStream(bytes))
    {
        memoryStream.Position = 0;
        ReceiptCollection items = (ReceiptCollection)binaryFormatter.Deserialize(memoryStream);
    }

试试吧！它真的对我有用。

Answer 2

首先检查实际存储在该列中的内容，并检查列的类型是varbinary还是类似。该错误表明序列化对象的数据流严重损坏或被截断。如果行/列不包含长“hexstring”，则插入/更新会出现写入问题，并在那里进一步搜索。

反序列化自定义对象时，二进制流“0”不包含有效的BinaryHeader错误

2 个答案: