Is it somehow possible to get the fully qualified name of the type contained in a TypeInfo
object?
In the debugger many of these values nicely show up as System.Int32
but when it's printed out, not one of them contains this fully qualified name. I need this to provide as an argument to Type.GetType()
.
var typeInfo = semanticModel.GetTypeInfo(argument);
var w = typeInfo.ToString(); // Microsoft.CodeAnalysis.TypeInfo
var y = typeInfo.Type.ToString(); // int
var z = typeInfo.Type.ToDisplayString(); // int
var a = typeInfo.Type.OriginalDefinition.ToDisplayString(); // int
var b = typeInfo.Type.OriginalDefinition.ToString(); // int
var c = typeInfo.Type.Name; // Int32
var d = typeInfo.Type.MetadataName; // Int32
var e = typeInfo.Type.ToDisplayParts(); // {int}
var f = typeInfo.Type.ContainingNamespace; // System
Note that this should work for every type so I can't just concatenate the namespace with the name.
Alternatively: is there another (more suited?) way to get the exact type?
For context: I want to check if the type-parameters of a class contain a few specific methods. Therefore my approach was to get the parameters from the TypeArgumentListSyntax
and get the TypeInfo
from each TypeSyntax
object.
The ToDisplayString
method lets you pass in a "format" object which has a huge number of options for controlling how you want to format stuff:
var symbolDisplayFormat = new SymbolDisplayFormat(
typeQualificationStyle: SymbolDisplayTypeQualificationStyle.NameAndContainingTypesAndNamespaces);
string fullyQualifiedName = typeSymbol.ToDisplayString(symbolDisplayFormat);
The reason your getting keywords like "int" is the default format is including the SymbolDisplayMiscellaneousOptions.UseSpecialTypes
flag which specifies to use the language keywords for special types vs. the regular name.
I couldn't find something built-in either and I'm quite sure this isn't the most elegant way, but it worked for me to construct a qualified type name like this:
private static string GetQualifiedTypeName(ISymbol symbol)
{
return symbol.ContainingNamespace
+ "." + symbol.Name
+ ", " + symbol.ContainingAssembly;
}
If you don't need an assembly qualified type name don't concatenate ContainingAssembly
at the end of the last line.
Using the semantic model you can also do it like i did it here:
var typeInfo = context.SemanticModel.GetTypeInfo(identifierNameSyntax);
var namedType = typeInfo.Type as INamedTypeSymbol;
if (namedType != null && namedType.Name == nameof(ConfiguredTaskAwaitable) && GetFullNamespace(namedType) == typeof(ConfiguredTaskAwaitable).Namespace)
return true;
where "GetFullNamespace" works like this:
public static IEnumerable<string> GetNamespaces(INamedTypeSymbol symbol)
{
var current = symbol.ContainingNamespace;
while (current != null)
{
if (current.IsGlobalNamespace)
break;
yield return current.Name;
current = current.ContainingNamespace;
}
}
public static string GetFullNamespace(INamedTypeSymbol symbol)
{
return string.Join(".", GetNamespaces(symbol).Reverse());
}
public static string GetFullTypeName(INamedTypeSymbol symbol)
{
return string.Join(".", GetNamespaces(symbol).Reverse().Concat(new []{ symbol.Name }));
}
Obviously Jason Malinowski's answer is more convenient for simple cases
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