Question

我创建了一个自定义属性类

        [System.AttributeUsage(System.AttributeTargets.Property)]
        public class Format : Attribute
        {
            public string           DisplayName { get; set; }
            public ColumnType       ColumnType  { get; set; }
            public double           Width       { get; set; }
            public bool             ReadOnly    { get; set; }

            public Format()
            {
                ReadOnly = true;
            }
        }

然后我在以下ViewModel类

中实现了这个自定义属性

        public class GridTestData
        {
            [Format(ColumnType = grdOpt.Column.ColumnType.BoundInteger, DisplayName = "Auto ID", ReadOnly = true)]
            int AutoID          {get; set;}

            [Format(ColumnType = grdOpt.Column.ColumnType.BoundString, DisplayName = "String", ReadOnly = true)]
            string String       {get; set;}

            [Format(ColumnType = grdOpt.Column.ColumnType.BoundInteger, DisplayName = "Integer", ReadOnly = true)]
            int? Integer        {get; set;}

            [Format(ColumnType = grdOpt.Column.ColumnType.BoundDouble, DisplayName = "Double", ReadOnly = true)]
            double? Double      {get; set;}

            [Format(ColumnType = grdOpt.Column.ColumnType.BoundBooleanTriState, DisplayName = "Boolean", ReadOnly = true)]
            bool? Boolean       {get; set;}

            [Format(ColumnType = grdOpt.Column.ColumnType.BoundDateTime, DisplayName = "Date Time", ReadOnly = true)]
            DateTime? DateTime  {get; set;}
        }

现在我想创建一个方法，将View Model作为参数并返回自定义属性列表，例如：

List<Format> MyFormatAttributes = GetFormatAttributes(typeof(GridTestData))

Answer 1

由于您的属性不公开，因此您需要使用NonPublic绑定标记来获取它们。然后，从属性中，您可以从所需的类型中获取所有属性。

var attrs = typeof(GridTestData)
    .GetProperties(BindingFlags.NonPublic | BindingFlags.Instance)
    .Select(o => o.GetCustomAttribute<Format>());

Answer 2

调用Type.GetProperties获取PropertyInfo的类型列表，为每个PropertyInfo获取getcustomattributes（）

Answer 3

创建一个这样的方法：

public static IList<Format> GetFormatAttributes<TViewModel>()
{
   return typeof(TViewModel)
    .GetProperties(BindingFlags.NonPublic | BindingFlags.Instance)
    .Select(t => t.GetCustomAttribute<Format>())
    .Where(a != null)
    .ToList();
}

并以这种方式使用它：

var myFormatAttributes = GetFormatAttributes<GridTestData>();

如何获取属性属性列表？

3 个答案: