How to Retrieve Enum Display Names in ASP.NET MVC Razor Views?

The name of the name

in the MVC Razor code

In the ASP.NET MVC Razor view, the display name of accessing enumeration members is essential to describe a friendly description to users. This article discusses how to retrieve these display names in the context of the MVC Razor code.

Problem description

Given a lift member who modifies [Display] attributes, challenges to extract these display names in the Razor code. The author intends to fill a list with the selection value of the promotion enumerated, and each value shows the corresponding display name.

Solution

In order to solve this problem, we use an extension method to make the province in the province and search for specific attributes applied to its members. The following is the code of the expansion method:

This method is used as a general method to retrieve any attributes applied to enumeration members. In our example, we want to retrieve the [Display] property to obtain its name attribute.

public static class Extensions
{
    public static TAttribute GetAttribute<TAttribute>(this Enum enumValue)
        where TAttribute : Attribute
    {
        return enumValue.GetType()
            .GetMember(enumValue.ToString())
            .First()
            .GetCustomAttribute<TAttribute>();
    }
}

Implementation in Razor view

Using the expansion method, we can now modify the Razor code as follows:

This code retrieves the [Display] property of the current promotion, and access its name property to display the corresponding display name in the list item. Note that the modified code uses

for type conversion, which is more secure and reliable to obtain attributes.

@foreach (int aPromotion in Enum.GetValues(typeof(UserPromotion)))
{
    var currentPromotion = (int)Model.JobSeeker.Promotion;
    if ((currentPromotion & aPromotion) == aPromotion)
    {
       var displayName = ((UserPromotion)aPromotion).GetAttribute<DisplayAttribute>().Name;
       <li>@displayName</li>
    }
}

Example usage

((UserPromotion)aPromotion)

Related example demonstration, please refer to the following code fragment:

Output:

public class Foo
{
    public Season Season { get; set; }

    public void DisplayName()
    {
        var seasonDisplayName = Season.GetAttribute<DisplayAttribute>();
        Console.WriteLine("Which season is it?");
        Console.WriteLine(seasonDisplayName?.Name ?? "Unknown"); // 使用空合并运算符处理可能为null的情况
    }
}

public enum Season
{
    [Display(Name = "It's autumn")]
    Autumn,
    [Display(Name = "It's winter")]
    Winter,
    [Display(Name = "It's spring")]
    Spring,
    [Display(Name = "It's summer")]
    Summer
}

The improved code is more robust, handling potential air citation abnormalities, and more clearly showing how to correctly use the extension method in the Razor view to obtain the display name.

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