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使用以下 Powershell 行可以正常工作，直到它到达包含字符实体的 XML 文件：

$xml = [xml] (Get-Content $file.Name)

如何使用 Powershell 读取 XML 文件并让它从 DTD 中解析字符实体，而不是生成如下错误：

Cannot convert value "System.Object[]" to type "System.Xml.XmlDocument". Error: "Reference to undeclared entity 'nbsp'. Line 3, position 324."
Cannot convert value "System.Object[]" to type "System.Xml.XmlDocument". Error: "Reference to undeclared entity 'Oacute'. Line 3, position 239."

当 XML 文件有效且不包含字符实体时，读取它们很容易。我在 XML 文件中使用这些字符实体指定了一个 DTD，但它没有使用它。XML 文件的示例开头：

<?xml version="1.0"?>
<!DOCTYPE catalog SYSTEM "manual.dtd">
<catalog ...

如何在 Powershell 中打开 XML 解析器？DTD 文件与 XML 文件位于同一文件夹中。

我有在 C# 中绕过此问题的代码，但是如何使用 Powershell 执行以下操作？

XML = XMLString;
var dtdPath = HttpContext.Current.ApplicationInstance.Server.MapPath("~/App_Data") + "\\Manual.dtd";
XML = XML.Replace("manual.dtd", dtdPath);
XmlUrlResolver resolver = new XmlUrlResolver();
resolver.Credentials = System.Net.CredentialCache.DefaultCredentials;
XmlReaderSettings settings = new XmlReaderSettings();
settings.DtdProcessing = DtdProcessing.Parse;
settings.ValidationType = ValidationType.None;
settings.XmlResolver = resolver;
XmlReader reader = XmlReader.Create(new System.IO.MemoryStream(System.Text.UTF8Encoding.UTF8.GetBytes(XML)), settings);
var XMLPrimary = XDocument.Load(reader);

这是我对执行此操作的 Powershell 代码的最佳猜测，但它仍然无法正常工作。如何使用 Powershell 设置 XmlUrlResolver？

$resolver = New-Object -TypeName System.Xml.XmlUrlResolver
$resolver.Credentials = [System.Net.CredentialCache]::DefaultCredentials
$readerSettings = New-Object -TypeName System.Xml.XmlReaderSettings
$readerSettings.DtdProcessing = [System.Xml.DtdProcessing]::Parse
$readerSettings.ValidationType = [System.Xml.ValidationType]::DTD
$readerSettings.XmlResolver = $resolver
$readerSettings.MaxCharactersFromEntities = 2048;
$readerSettings.ValidationFlags = [System.Xml.Schema.XmlSchemaValidationFlags]::ProcessInlineSchema -bor [System.Xml.Schema.XmlSchemaValidationFlags]::ProcessSchemaLocation
$readerSettings.add_ValidationEventHandler(
{
    Write-Host $("`nError found in XML: " + $_.Message + "`n") -ForegroundColor Red
    $script:errorCount++
});
$reader = [System.Xml.XmlReader]::Create($XmlFile.FullName, $readerSettings)
while ($reader.Read()) { }
$reader.Close()
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