c# - Sql server management studio 不允许编辑表的值

Question

使用 c# 代码，我将字节数组转换为字符串，然后使用实体框架存储到 sql 表中。直到这里没有问题。

但是，如果我尝试在 MSSql Server Management Studio 中使用“选择”命令查看存储在表中的值，它会在该列中显示空白值。如果我查询 Len(MyColumn) 那么它显示一个有效的长度。

为什么我看不到存储的价值？

更新：当我右键单击表格时，它会显示一个值 -> 编辑前 200 行。但是，只要我单击该单元格，值就会消失。我正在使用 Sql server 2005。

Answer 1

I have converted my byte array to a string

If you did something like message= Encoding.UTF8.GetString(myByteArray) you likely got unprintable characters. A leading \0 can cause your string to not print. This is the wrong way to handle binary data in a SQL database.

The correct way to handle this is one of the following options (in order of preference)

1. Store the data as a varbinary not a nvarchar this lets you store the byte[] directly with EF without doing any conversion at all.
2. Encode the data correctly
   1. Using Base64 encoding via message= Convert.ToBase64String(myByteArray) and myByteArray = Convert.FromBase64String(message)
   2. Using hexadecimal, SoapHexBinary makes it very easy to go to and from hexadecimal strings.