C
C#8mo ago
voltagex

✅ NotSupportedException: JsonTypeInfo metadata for type... & "minimal" APIs

Coming back to C# after quite a while and minimal APIs got complicated. What's going on with the error here? What does it actually want me to add? Why is it trying to serialize a System.Func?
NotSupportedException: JsonTypeInfo metadata for type 'System.Func`2[Microsoft.Extensions.Options.IOptions`1[filelistclient.FileLocationOptions],System.String]' was not provided by TypeInfoResolver of type '[filelistclient.UnneededAddedComplexityJsonContext]'. If using source generation, ensure that all root types passed to the serializer have been annotated with 'JsonSerializableAttribute', along with any types that might be serialized polymorphically.

System.Text.Json.ThrowHelper.ThrowNotSupportedException_NoMetadataForType(Type type, IJsonTypeInfoResolver resolver)
NotSupportedException: JsonTypeInfo metadata for type 'System.Func`2[Microsoft.Extensions.Options.IOptions`1[filelistclient.FileLocationOptions],System.String]' was not provided by TypeInfoResolver of type '[filelistclient.UnneededAddedComplexityJsonContext]'. If using source generation, ensure that all root types passed to the serializer have been annotated with 'JsonSerializableAttribute', along with any types that might be serialized polymorphically.

System.Text.Json.ThrowHelper.ThrowNotSupportedException_NoMetadataForType(Type type, IJsonTypeInfoResolver resolver)
public class Program
{
public static void Main(string[] args)
{
var builder = WebApplication.CreateSlimBuilder(args);

builder.Services.ConfigureHttpJsonOptions(options =>
options.SerializerOptions.TypeInfoResolverChain.Insert(0, UnneededAddedComplexityJsonContext.Default));
builder.Services.AddOptions<FileLocationOptions>().BindConfiguration("FileLocation");
var app = builder.Build();


var testApi = app.MapGroup("/options");
testApi.MapGet("/", () => GetOptions);
app.Run();
}

private static string GetOptions(IOptions<FileLocationOptions> options)
{
return $"{options.Value.PathToScan}, {options.Value.SaveScanToPath}";
}
}
public class Program
{
public static void Main(string[] args)
{
var builder = WebApplication.CreateSlimBuilder(args);

builder.Services.ConfigureHttpJsonOptions(options =>
options.SerializerOptions.TypeInfoResolverChain.Insert(0, UnneededAddedComplexityJsonContext.Default));
builder.Services.AddOptions<FileLocationOptions>().BindConfiguration("FileLocation");
var app = builder.Build();


var testApi = app.MapGroup("/options");
testApi.MapGet("/", () => GetOptions);
app.Run();
}

private static string GetOptions(IOptions<FileLocationOptions> options)
{
return $"{options.Value.PathToScan}, {options.Value.SaveScanToPath}";
}
}
namespace filelistclient
{
[JsonSourceGenerationOptions(WriteIndented = true)]
[JsonSerializable(typeof(FileLocationOptions))]
[JsonSerializable(typeof(IOptions<FileLocationOptions>))]
internal partial class UnneededAddedComplexityJsonContext : JsonSerializerContext
{
}
}
namespace filelistclient
{
[JsonSourceGenerationOptions(WriteIndented = true)]
[JsonSerializable(typeof(FileLocationOptions))]
[JsonSerializable(typeof(IOptions<FileLocationOptions>))]
internal partial class UnneededAddedComplexityJsonContext : JsonSerializerContext
{
}
}
3 Replies
Pobiega
Pobiega8mo ago
testApi.MapGet("/", () => GetOptions); should be testApi.MapGet("/", GetOptions);
voltagex
voltagexOP8mo ago
damn.
Unknown User
Unknown User8mo ago
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