Sql server 2008 将varchar转换为int时出错？

Msg 245，16级，状态1，第89行 转换varchar值“创建System.DirectoryServices程序集时出错”时，转换失败到数据类型int

此错误由以下语句引起：

begin try print '  - Preparing to create System.DirectoryServices assembly with UNSAFE_ACCESS permission'
    create assembly [System.DirectoryServices] from 'c:\Windows\Microsoft.NET\Framework\v2.0.50727\System.DirectoryServices.dll'
    with permission_set = unsafe
    print '  - System.DirectoryServices assembly created'
end try
begin catch
    print 'There was an error creating the System.DirectoryServices assembly. '+Error_number()+Error_Severity()
end catch

---

这是从

catch

块中的数字到字符串的串联得到的。不强制转换是不允许的，因为它试图将字符串转换为数字，而不是将字符串转换为数字，并且由于字符串文字不是数字，因此此尝试注定会失败

您可以使用严重性为0的

RAISERROR

打印带有中替换值的消息，或者使用显式强制转换连接字符串

begin catch
declare @num int = Error_number()
declare @sev int = Error_Severity()
raiserror('There was an error creating the System.DirectoryServices assembly. %d %d ',0,1, @num,@sev)
end catch