xmlwriter写入xmlwriter格式

Question

我正在尝试生成这个doctype字符串：

<!DOCTYPE games SYSTEM "transform.dtd">

这就是我一直在尝试的：

$writer.WriteDocType("games", $null , "transform.dtd", $null )

我不是完全确定如何获得准确的行。

Answer 1

在PowerShell中有一个已知的bug：passing null to a string parameter results in a String.Empty instead of null.

您可以像这样处理它：

# Given an XML writer of some sort ...
$writer = [system.xml.xmlwriter]::create("$pwd\test.xml")

# Set up the parameters you want to pass to the method:
$params = @("games",$null,"transform.dtd",$null)

# And invoke it using .Net reflection:
$writer.GetType().GetMethod("WriteDocType").Invoke($writer,$params)

# Eventually, close the writer:
$writer.Close()