How Can I Get an Enum Value from its Description Attribute?

Get the enumeration value based on the description attribute

We introduced an extension method earlier, which is used to obtain the Description attribute associated with the enumeration. Now, let's explore a complementary function that allows us to obtain an enumeration based on its description.

To do this, we introduce the following extension methods:

<code class="language-csharp">public static class EnumEx
{
    public static T GetValueFromDescription<T>(string description) where T : Enum
    {
        foreach (var field in typeof(T).GetFields())
        {
            if (Attribute.GetCustomAttribute(field, typeof(DescriptionAttribute)) is DescriptionAttribute attribute)
            {
                if (attribute.Description == description)
                    return (T)field.GetValue(null);
            }
            else
            {
                if (field.Name == description)
                    return (T)field.GetValue(null);
            }
        }

        throw new ArgumentException("未找到。", nameof(description));
        // 或返回 default(T);
    }
}</code>

Usage:

This method can be called as follows:

<code class="language-csharp">var panda = EnumEx.GetValueFromDescription<animal>("大熊猫");</code>

By providing a "pandas" description, the extension method will retrieve the corresponding pandas enumeration value.

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