Diese universelle Lösung ist für Personen gedacht, die generische Typen aus dynamischen externen Referenzen von laden müssen AssemblyQualifiedName, ohne zu wissen, von welcher Assembly alle Teile des generischen Typs stammen:
public static Type ReconstructType(string assemblyQualifiedName, bool throwOnError = true, params Assembly[] referencedAssemblies)
{
foreach (Assembly asm in referencedAssemblies)
{
var fullNameWithoutAssemblyName = assemblyQualifiedName.Replace($", {asm.FullName}", "");
var type = asm.GetType(fullNameWithoutAssemblyName, throwOnError: false);
if (type != null) return type;
}
if (assemblyQualifiedName.Contains("[["))
{
Type type = ConstructGenericType(assemblyQualifiedName, throwOnError);
if (type != null)
return type;
}
else
{
Type type = Type.GetType(assemblyQualifiedName, false);
if (type != null)
return type;
}
if (throwOnError)
throw new Exception($"The type \"{assemblyQualifiedName}\" cannot be found in referenced assemblies.");
else
return null;
}
private static Type ConstructGenericType(string assemblyQualifiedName, bool throwOnError = true)
{
Regex regex = new Regex(@"^(?<name>\w+(\.\w+)*)`(?<count>\d)\[(?<subtypes>\[.*\])\](, (?<assembly>\w+(\.\w+)*)[\w\s,=\.]+)$?", RegexOptions.Singleline | RegexOptions.ExplicitCapture);
Match match = regex.Match(assemblyQualifiedName);
if (!match.Success)
if (!throwOnError) return null;
else throw new Exception($"Unable to parse the type's assembly qualified name: {assemblyQualifiedName}");
string typeName = match.Groups["name"].Value;
int n = int.Parse(match.Groups["count"].Value);
string asmName = match.Groups["assembly"].Value;
string subtypes = match.Groups["subtypes"].Value;
typeName = typeName + $"`{n}";
Type genericType = ReconstructType(typeName, throwOnError);
if (genericType == null) return null;
List<string> typeNames = new List<string>();
int ofs = 0;
while (ofs < subtypes.Length && subtypes[ofs] == '[')
{
int end = ofs, level = 0;
do
{
switch (subtypes[end++])
{
case '[': level++; break;
case ']': level--; break;
}
} while (level > 0 && end < subtypes.Length);
if (level == 0)
{
typeNames.Add(subtypes.Substring(ofs + 1, end - ofs - 2));
if (end < subtypes.Length && subtypes[end] == ',')
end++;
}
ofs = end;
n--;
}
if (n != 0)
throw new Exception("Generic type argument count mismatch! Type name: " + assemblyQualifiedName);
Type[] types = new Type[typeNames.Count];
for (int i = 0; i < types.Length; i++)
{
try
{
types[i] = ReconstructType(typeNames[i], throwOnError);
if (types[i] == null)
return null;
}
catch (Exception ex)
{
throw new Exception($"Unable to reconstruct generic type. Failed on creating the type argument {(i + 1)}: {typeNames[i]}. Error message: {ex.Message}");
}
}
Type resultType = genericType.MakeGenericType(types);
return resultType;
}
Und Sie können es mit diesem Code (Konsolen-App) testen :
static void Main(string[] args)
{
Type t1 = typeof(Task<Dictionary<int, Dictionary<string, int?>>>);
string name = t1.AssemblyQualifiedName;
Console.WriteLine("Type: " + name);
Type t2 = ReconstructType(name);
bool ok = t1 == t2;
Console.WriteLine("\r\nLocal type test OK: " + ok);
Assembly asmRef = Assembly.ReflectionOnlyLoad("System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089");
string refTypeTest = "System.Threading.Tasks.Task`1[[System.Windows.Forms.DialogResult, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089";
Type t3 = ReconstructType(refTypeTest, true, asmRef);
Console.WriteLine("External type test OK: " + (t3.AssemblyQualifiedName == refTypeTest));
Type t4 = ReconstructType("System.Windows.Forms.DialogResult, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089", true, asmRef);
Console.ReadLine();
}
Ich teile meine Lösung, um Menschen mit dem gleichen Problem wie mir zu helfen (um JEDEN Typ aus einer Zeichenfolge zu deserialisieren, die in einer extern referenzierten Assembly sowohl teilweise als auch als Ganzes definiert werden kann - und die Referenzen werden vom Benutzer der App dynamisch hinzugefügt).
Hoffe es hilft jedem!