@RichTebbのコードは素晴らしく、Model属性DisplayNameを返すことがわかりました。
しかし、すべてのModel Display(Name =)属性値を反復処理するにはどうすればよいでしょうか。
手がかりをありがとう!
@RichTebbコード
public static class HelperReflectionExtensions
{
public static string GetPropertyDisplayString<T>(Expression<Func<T, object>> propertyExpression)
{
var memberInfo = GetPropertyInformation(propertyExpression.Body);
if (memberInfo == null)
{
throw new ArgumentException(
"No property reference expression was found.",
"propertyExpression");
}
var displayAttribute = memberInfo.GetAttribute<DisplayAttribute>(false);
if (displayAttribute != null)
{
return displayAttribute.Name;
}
// ReSharper disable RedundantIfElseBlock
else
// ReSharper restore RedundantIfElseBlock
{
var displayNameAttribute = memberInfo.GetAttribute<DisplayNameAttribute>(false);
if (displayNameAttribute != null)
{
return displayNameAttribute.DisplayName;
}
// ReSharper disable RedundantIfElseBlock
else
// ReSharper restore RedundantIfElseBlock
{
return memberInfo.Name;
}
}
}
public static MemberInfo GetPropertyInformation(Expression propertyExpression)
{
Debug.Assert(propertyExpression != null, "propertyExpression != null");
var memberExpr = propertyExpression as MemberExpression;
if (memberExpr == null)
{
var unaryExpr = propertyExpression as UnaryExpression;
if (unaryExpr != null && unaryExpr.NodeType == ExpressionType.Convert)
{
memberExpr = unaryExpr.Operand as MemberExpression;
}
}
if (memberExpr != null && memberExpr.Member.MemberType == MemberTypes.Property)
{
return memberExpr.Member;
}
return null;
}
public static T GetAttribute<T>(this MemberInfo member, bool isRequired)
where T : Attribute
{
var attribute = member.GetCustomAttributes(typeof(T), false).SingleOrDefault();
if (attribute == null && isRequired)
{
throw new ArgumentException(
string.Format(
CultureInfo.InvariantCulture,
"The {0} attribute must be defined on member {1}",
typeof(T).Name,
member.Name));
}
return (T)attribute;
}
}
サンプル:
string displayName = ReflectionExtensions.GetPropertyDisplayName<SomeClass>(i => i.SomeProperty);