Using .Databases with a misspelled database name changes database name in SMO

This bug was found using dbatools: https://github.com/dataplat/dbatools/issues/8598

There are two ways to select a single database from the list of databases from a Microsoft.SqlServer.Management.Smo.Server object: $server.Databases | Where-Object Name -EQ <dbname> and $server['<dbname>'].

The first one works without problems. But the second one changes the casing of the name from the original one to the one used to query the database.

Here is the code to show that:

Import-Module -Name dbatools

# correct:
$server = [Microsoft.SqlServer.Management.Smo.Server]::new('sql01')
$server.Databases | Where-Object Name -EQ Master | Select-Object -ExpandProperty Name
$server.Databases['Master'] | Select-Object -ExpandProperty Name

# wrong:
$server = [Microsoft.SqlServer.Management.Smo.Server]::new('sql01')
$server.Databases['Master'] | Select-Object -ExpandProperty Name
$server.Databases | Where-Object Name -EQ Master | Select-Object -ExpandProperty Name

And here is a screenshot:

Yes, I'm using not the current version - but I don't have the current version at hand. But I think it will take you only minutes to test this in your test environment. If it is fixed with the current version: Sorry to bother you.

首先，使用 Server.Databases 及其字符串索引器，通过 PowerShell 示例复现该行为。然后跟踪 Databases 集合查找背后的实现，并为大小写不同或拼写错误的查询添加回归测试覆盖。当查询数据库不再更改原始数据库名称或其大小写时，即表示完成。