[英]Deserialize binary array from database C#
我正在嘗試在數據庫中保存和檢索文件。 我正在序列化對象並將其保存為二進制。 但是,當嘗試反序列化時,出現錯誤,即輸入流不是有效的二進制格式。 我嘗試了幾種解決方案,到目前為止,這是我整理的內容:
public void saveFile(string filename, string file, object o)
{
byte[] myFile;
if (o != null)
{
BinaryFormatter bf = new BinaryFormatter();
using (MemoryStream ms = new MemoryStream())
{
bf.Serialize(ms, o);
myFile= ms.ToArray();
}
String insert = "INSERT INTO user_files(FileName, Username, File) VALUES ('myfile','noname','"+ myFile + "')";
MySqlCommand command = new MySqlCommand(insert, connection);
try
{
connection.Open();
command.ExecuteNonQuery();
}
catch
{
MessageBox.Show("Sorry, something went wrong");
}
finally
{ connection.Close(); }
}
這是負載
public TrafficMonitor LoadFile(string user, string filename)
{
TrafficMonitor obj = null;
byte[] myFile = null;
DataTable dt = new DataTable();
MySqlDataAdapter getCommand = new MySqlDataAdapter("Select File from user_files where Username='noname' and filename='myfile'" , connection);
try
{
connection.Open();
getCommand.Fill(dt);
foreach (DataRow row in dt.Rows)
{
myFile= (byte[])row["File"];
}
MemoryStream memStream = new MemoryStream();
BinaryFormatter binForm = new BinaryFormatter();
memStream.Write(myFile, 0, myFile.Length);
memStream.Seek(0, SeekOrigin.Begin);
obj = (TrafficMonitor)binForm.Deserialize(memStream);
}
catch { MessageBox.Show("Sorry, something went wrong"); }
finally { connection.Close(); }
return obj;
}
這是我將二進制數據插入MySQL的方法:
byte[] imgBuffer = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
MySqlCommand query = new MySqlCommand();
query.Connection = _connection;
query.CommandText = "INSERT INTO Photos(id,img) VALUES(?id,?img)";
var id = Guid.NewGuid();
query.Parameters.Add("?id", MySqlDbType.Binary).Value = id.ToByteArray();
query.Parameters.Add("?img", MySqlDbType.Blob).Value = imgBuffer;
query.ExecuteNonQuery();
以及如何從MySQL讀取二進制數據:
MySqlCommand query = new MySqlCommand();
query.Connection = _connection;
query.CommandText = "SELECT * FROM Photos WHERE id=@ID";
query.Parameters.Add("@id", MySqlDbType.Binary).Value = guid.ToByteArray();
using (MySqlDataReader reader = query.ExecuteReader())
{
if (reader.Read())
{
Guid id = reader.GetGuid(0);
byte[] imgBuffer = (byte[])reader.GetValue(1);
}
}
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.