检查给定类型是否是枚举

发布于 2024-12-14 05:38:31 字数 751 浏览 1 评论 0原文

我正在为 Json.NET 编写一个 JsonConverter，它应该允许我将任何枚举转换为由 [Description] 属性定义的字符串值。

例如：

public enum MyEnum {
    [Description("Sunday")] Sunday,
    [Description("Monday")] Monday,
    [Description("Tuesday")] Tuesday,
    [Description("Wednesday")] Wednesday,
    [Description("Thursday")] Thursday,
    [Description("Friday")] Friday,
    [Description("Saturday")] Saturday
}

我已经有了支持 myEnum.Description() 的代码，它显然会返回其字符串描述。

在 JsonConverter 实现中，有一个方法：

    public override bool CanConvert(Type objectType)
    {

    }

我试图弄清楚如何确定 objectType 是否为 Enum 并返回 true，以便转换器知道它可以转换它目的。由于我有许多Enum，我无法显式检查每个枚举，因此我希望有一种更通用的方法来完成此任务。

原文

I am writing a JsonConverter for Json.NET which should allow me to convert any enum's to a string value defined by a [Description] attribute.

For example:

public enum MyEnum {
    [Description("Sunday")] Sunday,
    [Description("Monday")] Monday,
    [Description("Tuesday")] Tuesday,
    [Description("Wednesday")] Wednesday,
    [Description("Thursday")] Thursday,
    [Description("Friday")] Friday,
    [Description("Saturday")] Saturday
}

I already have the code for supporting myEnum.Description() which will obviously return its string description.

In the JsonConverter implementation, there is this method:

    public override bool CanConvert(Type objectType)
    {

    }

I am trying to figure out how to determine if objectType is an Enum and return true so that the converter knows it can convert this object. Since I have many Enum's, I cannot explicitly check each one so I was hoping for a more generic way of accomplishing this.

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皓月长歌 2024-12-21 05:38:31

使用 IsEnum 属性:

if(objectType.IsEnum) {
    return true;
}

Use the IsEnum property:

if(objectType.IsEnum) {
    return true;
}

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又怨 2024-12-21 05:38:31

Type.IsEnum 是您正在寻找的

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你的他你的她 2024-12-21 05:38:31

我完全误解了这个问题，因为过于关注 [Description]，所以如果您想检查特定枚举是否具有 [description] 属性（以防 json 在没有属性时抛出合适的情况），这是一种可能的检查方法：

public override bool CanConvert(Type objectType)
{
    FieldInfo[] fieldInfo = objectType.GetFields(BindingFlags.Public | BindingFlags.Static);

    if( fieldInfo.Length > 0 )
    {
        return ( fieldInfo[0].GetCustomAttributes(typeof(DescriptionAttribute),false).Length > 0 );
    }
    else
    {
        return false;
    }
}

I completely misinterpreted the question by focusing too much on the [Description], so in case you ever want to check whether a particular enum has a [description] attribute or not ( in case json throws a fit when there is none ), this is one possible way to check for that:

public override bool CanConvert(Type objectType)
{
    FieldInfo[] fieldInfo = objectType.GetFields(BindingFlags.Public | BindingFlags.Static);

    if( fieldInfo.Length > 0 )
    {
        return ( fieldInfo[0].GetCustomAttributes(typeof(DescriptionAttribute),false).Length > 0 );
    }
    else
    {
        return false;
    }
}

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~没有更多了~