sql-server - 我如何使用 C# 将图像存储在数据库中？

Question

这是我的 C# 代码，它在 Grid(WPF) 中打印图像，现在我想 将此图像存储在数据库中，数据库中的列名称为 图片。我有所有其他代码数据库连接等。请告诉我哪个 哪种方法最适合在数据库中存储图像？

 private void button_Browse_Click(object sender, RoutedEventArgs e)
    {
        OpenFileDialog op = new OpenFileDialog();
        op.Title = "Select a picture";
        op.Filter = "All supported graphics|*.jpg;*.jpeg;*.png|" +
          "JPEG (*.jpg;*.jpeg)|*.jpg;*.jpeg|" +
          "Portable Network Graphic (*.png)|*.png";
        if (op.ShowDialog() == true)
        {
        imgPhoto.Source = new BitmapImage(new Uri(op.FileName));//this line print image in Grid

        }
    }

Answer 1

您可以使用VARBINARY(MAX) 来存储任何类型的文件:

我自己给你举个例子，希望对你有帮助。

首先创建一个表(比如tblSampleImage)然后添加两列(FileName VARCHAR(20) , FileContent VARBINARY(MAX))

下面是一个用于从数据库中插入和获取文件的示例 CS 代码:

public void insertFile()
{
   string fileName= Path.GetFileName(@"your file full path");
   string filePath= Path.GetFullPath(@"your file full path");
   if (!File.Exists(filePath))
            {
                MessageBox.Show("File not found");
                return;
            }
    byte[] contents= File.ReadAllBytes(filePath);
    string insertStmt = "INSERT INTO tblSampleImage(FileName, FileContent) VALUES(@FileName, @FileContent)";
    SqlConnection connection = new SqlConnection();
    connection.ConnectionString = "connectionString";
    using (SqlCommand cmdInsert = new SqlCommand(insertStmt, connection))
          {
          cmdInsert.Parameters.Add("@FileName", SqlDbType.VarChar, 20).Value = fileName;
          cmdInsert.Parameters.Add("@FileContent", SqlDbType.VarBinary, int.MaxValue).Value = contents;
          connection.Open();
          cmdInsert.ExecuteNonQuery();
           connection.Close();
          }   
}

获取文件

   public void fetchFile()
        {
        string newFilePath = Path.GetFullPath(@"your new path where you store your fetched file");
        string fileName="File1"; //this is the file's name which is stored in database and you want to fetch
         byte[] fileContents;
         string selectStmt = "SELECT FileContent FROM tblSampleImage WHERE FileName = @FileName";
         SqlConnection connection = new SqlConnection();
         connection.ConnectionString = "connectionString";
         using (SqlCommand cmdSelect = new SqlCommand(selectStmt, connection))
            {
               cmdSelect.Parameters.Add("@Filename", SqlDbType.VarChar).Value = fileName;
               connection.Open();
               fileContents = (byte[])cmdSelect.ExecuteScalar();
               connection.Close();
            }
         File.WriteAllBytes(newFilePath, fileContents);
         MessageBox.Show("File Saved at:  " + newFilePath);
    }