无法获得[Display（Name =“”）]属性

Question

我有这个元数据：

public class ForecastVSPurchaseUploadedPOMasterItemMetadata
{
    [Display(Name ="Forecast")]
    public decimal m;
}

和部分类：

[MetadataType(typeof(ForecastVSPurchaseUploadedPOMasterItemMetadata))]
public partial class V_CT2_ForecastVSPurchaseUploadedPOMasterItem
{
}

班级：

public partial class V_CT2_ForecastVSPurchaseUploadedPOMasterItem
{
    public decimal m { get; set; }
}

我试图通过下面的代码（扩展方法）获取名称：

var customAttribute = memberInfo.GetCustomAttributes(typeof(DisplayAttribute), false).FirstOrDefault();
if (customAttribute != null)
{
    titleName = (customAttribute as DisplayAttribute).Name;
}
else
{
    titleName = memberInfo.Name;
}

但customAttribute始终为空。

我是根据此question

执行此操作的

我使用@Html.DisplayNameFor(model => model.m)进行了测试，它会显示我在元数据类中设置的任何名称。

元数据metaProperty的属性也为空：

public static List<string> GetPropertyDisplayNames(this Type type)
{
    var titleList = new List<string>();
    var propertyInfos = type.GetProperties();

    foreach (var propertyInfo in propertyInfos)
    {
        var titleName = propertyInfo.GetDisplayName();
        {
            var atts = propertyInfo.DeclaringType.GetCustomAttributes(typeof(MetadataTypeAttribute), true);
            if (atts != null)
            {
                var metaAttr = atts[0] as MetadataTypeAttribute;
                var metaProperty = metaAttr.MetadataClassType.GetProperty(propertyInfo.Name);
            }
        }
        titleList.Add(titleName);
    }
    return titleList;
}

扩展类代码：

public static class EnumerableExtensionClass
{
    public static HSSFWorkbook ExportExcel<T>(this IEnumerable<T> dataList)
    {
        //Create workbook
        var datatype = typeof(T);
        var workbook = new HSSFWorkbook();
        var worksheet = workbook.CreateSheet(string.Format("{0}", datatype.GetDisplayName()));

        //Insert titles
        var row = worksheet.CreateRow(0);
        var titleList = datatype.GetPropertyDisplayNames();
        for (int i = 0; i < titleList.Count; i++)
        {
            row.CreateCell(i).SetCellValue(titleList[i]);
        }

        //Insert data values
        for (int i = 1; i < dataList.Count() + 1; i++)
        {
            var tmpRow = worksheet.CreateRow(i);
            var valueList = dataList.ElementAt(i - 1).GetPropertyValues();

            for (int j = 0; j < valueList.Count; j++)
            {
                tmpRow.CreateCell(j).SetCellValue(valueList[j]);
            }
        }

        //Save file
        return workbook;
    }

    public static string GetDisplayName(this MemberInfo memberInfo)
    {
        var titleName = string.Empty;

        //Try get DisplayName
        var attribute = memberInfo.GetCustomAttributes(typeof(DisplayNameAttribute), false).FirstOrDefault();

        if (attribute != null)
        {
            titleName = (attribute as DisplayNameAttribute).DisplayName;
        }
        //If no DisplayName
        else
        {
            var customAttribute = memberInfo.GetCustomAttributes(typeof(DisplayAttribute), false).FirstOrDefault();
            if (customAttribute != null)
            {
                titleName = (customAttribute as DisplayAttribute).Name;
            }
            else
            {
                titleName = memberInfo.Name;
            }
        }

        return titleName;
    }

    public static List<string> GetPropertyDisplayNames(this Type type)
    {
        var titleList = new List<string>();
        var propertyInfos = type.GetProperties();

        foreach (var propertyInfo in propertyInfos)
        {
            var titleName = propertyInfo.GetDisplayName();
            titleList.Add(titleName);
        }

        return titleList;
    }

    public static List<string> GetPropertyValues<T>(this T data)
    {
        var propertyValues = new List<string>();
        var propertyInfos = data.GetType().GetProperties();

        foreach (var propertyInfo in propertyInfos)
        {
            propertyValues.Add(propertyInfo.GetValue(data, null).ToString());
        }

        return propertyValues;
    }
}