Question

我遇到的问题与https://github.com/aspnet/AspNetCore/issues/4008有点相似，我想在所有可能的情况下寻求帮助。

对于网址http://localhost:51049/api/values/proof_of_address，路由应在下面的枚举中将proof_of_address评估为ProofOfAddress。

我试图按照上面链接中的示例进行操作，但是无论我在url中输入什么内容，我都会在枚举中获得第一个值。我的代码如下：

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1).AddJsonOptions(opt =>
    {
        opt.SerializerSettings.Formatting = Newtonsoft.Json.Formatting.None;
        opt.SerializerSettings.Converters.Add(new StringEnumConverter());
    });
}

[HttpGet("{documenttype}")]
public ActionResult<string> Get([FromRoute] DocumentType documenttype)
{
    return documenttype.ToString();
}

public class CustomEnumConverter<T> : TypeConverter
{
    public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
    {
        var s = value as string;
        if (string.IsNullOrEmpty(s))
        {
            return null;
        }

        return JsonConvert.DeserializeObject<T>(@"""" + value.ToString() + @"""");
    }
}

[TypeConverter(typeof(CustomEnumConverter<DocumentType>))]
public enum DocumentType
{
    [EnumMember(Value = "passport")]
    Passport,

    [EnumMember(Value = "proof_of_address")]
    ProofOfAddress
}

谢谢您的任何帮助。

Answer 1

您需要覆盖CanConvertFrom才能返回true

public class CustomEnumConverter<T> : TypeConverter
{
    public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
    {
        return true;
    }

    public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
    {
        var s = value as string;
        if (string.IsNullOrEmpty(s))
        {
            return null;
        }

        return JsonConvert.DeserializeObject<T>(@"""" + value.ToString() + @"""");
    }
}

使用FromRoute和EnumMember的.Net Core枚举问题

1 个答案: