[英]About Enum and DataAnnotation
I have this Enum (Notebook.cs): 我有这个枚举(Notebook.cs):
public enum Notebook : byte
{
[Display(Name = "Notebook HP")]
NotebookHP,
[Display(Name = "Notebook Dell")]
NotebookDell
}
Also this property in my class (TIDepartment.cs): 我的班级(TIDepartment.cs)中的这个属性:
public Notebook Notebook { get; set; }
It's working perfectly, I just have one "problem": 它工作得很好,我只有一个“问题”:
I created an EnumDDLFor and it's showing the name I setted in DisplayAttribute, with spaces, but the object doesn't receive that name in DisplayAttribute, receives the Enum name (what is correct), so my question is: 我创建了一个EnumDDLFor,它显示我在DisplayAttribute中设置的名称,带有空格,但是对象在DisplayAttribute中没有收到该名称,收到Enum名称(正确),所以我的问题是:
Is there a way to receive the name with spaces which one I configured in DisplayAttribute? 有没有办法接收带有我在DisplayAttribute中配置的空格的名称?
MVC doesn't make use of the Display attribute on enums (or any framework I'm aware of). MVC没有在枚举(或我知道的任何框架)上使用Display属性。 You need to create a custom Enum extension class:
您需要创建自定义Enum扩展类:
public static class EnumExtensions
{
public static string GetDisplayAttributeFrom(this Enum enumValue, Type enumType)
{
string displayName = "";
MemberInfo info = enumType.GetMember(enumValue.ToString()).First();
if (info != null && info.CustomAttributes.Any())
{
DisplayAttribute nameAttr = info.GetCustomAttribute<DisplayAttribute>();
displayName = nameAttr != null ? nameAttr.Name : enumValue.ToString();
}
else
{
displayName = enumValue.ToString();
}
return displayName;
}
}
Then you can use it like this: 然后你可以像这样使用它:
Notebook n = Notebook.NotebookHP;
String displayName = n.GetDisplayAttributeFrom(typeof(Notebook));
EDIT: Support for localization 编辑:支持本地化
This may not be the most efficient way, but SHOULD work. 这可能不是最有效的方式,但应该工作。
public static class EnumExtensions
{
public static string GetDisplayAttributeFrom(this Enum enumValue, Type enumType)
{
string displayName = "";
MemberInfo info = enumType.GetMember(enumValue.ToString()).First();
if (info != null && info.CustomAttributes.Any())
{
DisplayAttribute nameAttr = info.GetCustomAttribute<DisplayAttribute>();
if(nameAttr != null)
{
// Check for localization
if(nameAttr.ResourceType != null && nameAttr.Name != null)
{
// I recommend not newing this up every time for performance
// but rather use a global instance or pass one in
var manager = new ResourceManager(nameAttr.ResourceType);
displayName = manager.GetString(nameAttr.Name)
}
else if (nameAttr.Name != null)
{
displayName = nameAttr != null ? nameAttr.Name : enumValue.ToString();
}
}
}
else
{
displayName = enumValue.ToString();
}
return displayName;
}
}
On the enum, the key and resource type must be specified: 在枚举上,必须指定密钥和资源类型:
[Display(Name = "MyResourceKey", ResourceType = typeof(MyResourceFile)]
Here's a simplified (and working) version of akousmata's localized enum extension: 这是akousmata的本地化枚举扩展的简化(和工作)版本:
public static string DisplayName(this Enum enumValue)
{
var enumType = enumValue.GetType();
var memberInfo = enumType.GetMember(enumValue.ToString()).First();
if (memberInfo == null || !memberInfo.CustomAttributes.Any()) return enumValue.ToString();
var displayAttribute = memberInfo.GetCustomAttribute<DisplayAttribute>();
if (displayAttribute == null) return enumValue.ToString();
if (displayAttribute.ResourceType != null && displayAttribute.Name != null)
{
var manager = new ResourceManager(displayAttribute.ResourceType);
return manager.GetString(displayAttribute.Name);
}
return displayAttribute.Name ?? enumValue.ToString();
}
Note: I move enumType
from a parameter to a local variable. 注意:我将
enumType
从参数移动到局部变量。
Example usage: 用法示例:
public enum IndexGroupBy
{
[Display(Name = "By Alpha")]
ByAlpha,
[Display(Name = "By Type")]
ByType
}
And 和
@IndexGroupBy.ByAlpha.DisplayName()
Here is a editor template that can be used with the extension method above: 这是一个可以与上面的扩展方法一起使用的编辑器模板:
@model Enum
@{
var listItems = Enum.GetValues(Model.GetType()).OfType<Enum>().Select(e =>
new SelectListItem
{
Text = e.DisplayName(),
Value = e.ToString(),
Selected = e.Equals(Model)
});
var prefix = ViewData.TemplateInfo.HtmlFieldPrefix;
var index = 0;
ViewData.TemplateInfo.HtmlFieldPrefix = string.Empty;
foreach (var li in listItems)
{
var fieldName = string.Format(CultureInfo.InvariantCulture, "{0}_{1}", prefix, index++);
<div class="editor-radio">
@Html.RadioButton(prefix, li.Value, li.Selected, new {@id = fieldName})
@Html.Label(fieldName, li.Text)
</div>
}
ViewData.TemplateInfo.HtmlFieldPrefix = prefix;
}
And here is an example usage: 以下是一个示例用法:
@Html.EditorFor(m => m.YourEnumMember, "Enum_RadioButtonList")
Since you are worrying about visuals I would use a configurable approach: 由于您担心视觉效果,我会使用可配置的方法:
public NotebookTypes NotebookType;
public enum NotebookTypes{
NotebookHP,
NotebookDell
}
public string NotebookTypeName{
get{
switch(NotebookType){
case NotebookTypes.NotebookHP:
return "Notebook HP"; //You may read the language dependent value from xml...
case NotebookTypes.NotebookDell:
return "Notebook Dell"; //You may read the language dependent value from xml...
default:
throw new NotImplementedException("'" + typeof(NotebookTypes).Name + "." + NotebookType.ToString() + "' is not implemented correctly.");
}
}
}
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