将SqlCommand列（多行）读入单个C＃byte []数组

Question

给定一个带有数据的SQL表Document ：

ID  Content     ByteLength  Sequence
1   Part1...    945669      1
1   Part2...    945669      2
1   Part3...    945669      3

...

2   Part1...    45234       1
2   Part2...    45234       2

哪里：

Document.Content = Up to 32KB of data
Document.ByteLength = Total data in bytes for the Document ID
Document.Sequence = Order of content in the Document ID

如何将所有Document.Content读入单字节数组byte[] Content ？

using (var command = new SqlCommand("SELECT Content FROM Document WHERE ID=1 ORDER BY Sequence", connection))
    using (var reader = command.ExecuteReader())
    {
        while(reader.Read())
        {
            // What goes here?

            // if we just want one row:
            //var fileBytes = (byte[])reader.GetValue(0); // read the file data from the selected row (first column in above query)
        }
    }

Answer 1

鉴于此Content字段包含文本数据的事实，您可以在读取content字段时简单地使用StringBuilder添加数据

using (var command = new SqlCommand("SELECT Content FROM Document WHERE ID=1 ORDER BY Sequence", connection))
using (var reader = command.ExecuteReader())
{
    // Set a large enough initial capacity
    StringBuilder sb = new StringBuilder(32767);
    while(reader.Read())
    {
        sb.Append(reader.GetString(0));
    }
}

现在，在循环出口处，所有内容都在StringBuilder缓冲区中，您可以使用

byte[] buffer = System.Text.Encoding.UTF8.GetBytes(sb.ToString());