如何使用输出参数调用.net方法？

Question

我只想从PowerShell 调用Microsoft.Data.Schema.ScriptDom.Sql.Sql100ScriptGenerator的GenerateScript方法.

#C

public void GenerateScript(
    IScriptFragment scriptFragment,
    out string script
)

我找到了这个,但我没有得到它的工作

$sg = new-object  Microsoft.Data.Schema.ScriptDom.Sql.Sql100ScriptGenerator

$sql = 'select * from PowerShell'

$out = ''
$sg.GenerateScript($sql, [ref] $out)

$out

这给了

Cannot find an overload for "GenerateScript" and the argument count: "2".
At line:6 char:19
+ $sg.GenerateScript <<<< ($sql, [ref] $out)
    + CategoryInfo          : NotSpecified: (:) [], MethodException
    + FullyQualifiedErrorId : MethodCountCouldNotFindBest

编辑:

目前的版本是

$sql = 'select * from PowerShell'

$sr = new-Object System.IO.StringReader($sql)

$sg =     new-object Microsoft.Data.Schema.ScriptDom.Sql.Sql100ScriptGenerator
$parser = new-object Microsoft.Data.Schema.ScriptDom.Sql.TSQL100parser($true)

$errors = ''
$fragment = $parser.Parse($sr,([ref]$errors))

$out = ''
$sg.GenerateScript($fragment,([ref][string]$out))

$out

但我得到一个错误

$fragment = $parser.Parse($sr,([ref]$errors))



Cannot find an overload for "Parse" and the argument count: "2".
At line:11 char:26
+ $fragment = $parser.Parse <<<< ($sr,([ref]$errors))
    + CategoryInfo          : NotSpecified: (:) [], MethodException
    + FullyQualifiedErrorId : MethodCountCouldNotFindBest

我正在尝试转换

    IList<ParseError> errors;

    using (StringReader sr = new StringReader(inputScript))
    {
        fragment = parser.Parse(sr, out errors);
    }

编辑:

好的,这有效:

$sql = @'
select * from PowerShell -- a comment
where psRefnr = 1
'@
$options = new-object Microsoft.Data.Schema.ScriptDom.Sql.SqlScriptGeneratorOptions

$sr = new-Object System.IO.StringReader($sql)

$sg =     new-object Microsoft.Data.Schema.ScriptDom.Sql.Sql100ScriptGenerator($options)
$parser = new-object Microsoft.Data.Schema.ScriptDom.Sql.TSQL100parser($true)

$errors = $null
$fragment = $parser.Parse($sr,([ref]$errors))

$out = $null
$sg.GenerateScript($fragment,([ref]$out))

$out

并生成(它按预期删除注释)

SELECT *
FROM   PowerShell
WHERE  psRefnr = 1;

Answer 1

我相信您的问题在于第一个参数，它应该是 IScriptFragment。您正在传递一个字符串。

您需要传递从TSqlFragment派生的内容。使用类似TSql100Parser.ParseStatementList方法，您将获得片段列表。

编辑：这篇博文与您的第二个错误有类似的问题。