internal static void AddReferencesToCommandLine(
CommandLineBuilderExtension commandLine,
ITaskItem[]?references,
bool isInteractive = false)
{
// If there were no references passed in, don't add any /reference: switches
// on the command-line.
if (references == null)
{
return;
}
// Loop through all the references passed in. We'll be adding separate
// /reference: switches for each reference, and in some cases even multiple
// /reference: switches per reference.
foreach (ITaskItem reference in references)
{
// See if there was an "Alias" attribute on the reference.
string aliasString = reference.GetMetadata("Aliases");
string switchName = "/reference:";
if (!isInteractive)
{
bool embed = Utilities.TryConvertItemMetadataToBool(reference,
"EmbedInteropTypes");
if (embed)
{
switchName = "/link:";
}
}
if (string.IsNullOrEmpty(aliasString))
{
// If there was no "Alias" attribute, just add this as a global reference.
commandLine.AppendSwitchIfNotNull(switchName, reference.ItemSpec);
}
else
{
// If there was an "Alias" attribute, it contains a comma-separated list
// of aliases to use for this reference. For each one of those aliases,
// we're going to add a separate /reference: switch to the csc.exe
// command-line
string[] aliases = aliasString.Split(',');
foreach (string alias in aliases)
{
// Trim whitespace.
string trimmedAlias = alias.Trim();
if (alias.Length == 0)
{
continue;
}
// The alias should be a valid C# identifier. Therefore it cannot
// contain comma, space, semicolon, or double-quote. Let's check for
// the existence of those characters right here, and bail immediately
// if any are present. There are a whole bunch of other characters
// that are not allowed in a C# identifier, but we'll just let csc.exe
// error out on those. The ones we're checking for here are the ones
// that could seriously screw up the command-line parsing or could
// allow parameter injection.
if (trimmedAlias.IndexOfAny(new char[] { ',', ' ', ';', '"' }) != -1)
{
throw Utilities.GetLocalizedArgumentException(
ErrorString.Csc_AssemblyAliasContainsIllegalCharacters,
reference.ItemSpec,
trimmedAlias);
}
// The alias called "global" is special. It means that we don't
// give it an alias on the command-line.
if (string.Compare("global", trimmedAlias, StringComparison.OrdinalIgnoreCase) == 0)
{
commandLine.AppendSwitchIfNotNull(switchName, reference.ItemSpec);
}
else
{
// We have a valid (and explicit) alias for this reference. Add
// it to the command-line using the syntax:
// /reference:Goo=System.Xml.dll
commandLine.AppendSwitchAliased(switchName, trimmedAlias, reference.ItemSpec);
}
}
}
}
}