How to Parse a String into an Enum in C#?

In C#, the string is parsed as enumerated

When processing the HTML form and enumeration in C#, the string value may need to be converted to its corresponding enumeration value. Here are some methods to implement this task:

General parsing method (.NET CORE and .NET Framework 4.0)

In .NET CORE and .NET Framework 4.0 and higher versions, you could use a general parsing method:

<code class="language-csharp">bool statusSuccess = Enum.TryParse("Active", out StatusEnum myStatus);</code>

Simplified analysis method

If you cannot access the latest .NET version, you can create a simplified analysis routine:

<code class="language-csharp">public static T ParseEnum<T>(string value)
{
    return (T)Enum.Parse(typeof(T), value, true);
}

StatusEnum myStatus = EnumUtil.ParseEnum<StatusEnum>("Active");
// 或
StatusEnum myStatus = "Active".ToEnum<StatusEnum>();</code>

The method with the default value

If the string may not be an effective enumeration value, you can provide a default value in the parsing method:

<code class="language-csharp">public static T ToEnum<T>(this string value, T defaultValue)
{
    if (value == null || value == "")
        return defaultValue;

    T result;
    return Enum.TryParse<T>(value, true, out result) ? result : defaultValue;
}

StatusEnum myStatus = "Active".ToEnum(StatusEnum.None);</code>

Remember that when modifying core classes like string classes, use the expansion method carefully because it will affect all instances of this class, regardless of its context.

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