我总是将DisplayName、Description和DefaultValue属性用于我的用户控件、自定义控件或我将通过属性网格编辑的任何类的公共财产。.NET PropertyGrid使用这些标记来设置未设置为默认值的名称、描述面板和粗体值的格式。

[DisplayName("Error color")]
[Description("The color used on nodes containing errors.")]
[DefaultValue(Color.Red)]
public Color ErrorColor
{
    ...
} 

如果找不到XML注释，我只希望Visual Studio的IntelliSense将Description属性考虑在内。这样可以避免同一句话重复两次。

[Flags]非常方便。语法糖是肯定的，但还是相当不错的。

[Flags] 
enum SandwichStuff
{
   Cheese = 1,
   Pickles = 2,
   Chips = 4,
   Ham = 8,
   Eggs = 16,
   PeanutButter = 32,
   Jam = 64
};

public Sandwich MakeSandwich(SandwichStuff stuff)
{
   Console.WriteLine(stuff.ToString());
   // ...
}

// ...

MakeSandwich(SandwichStuff.Cheese 
   | SandwichStuff.Ham 
   | SandwichStuff.PeanutButter);
// produces console output: "Cheese, Ham, PeanutButter"

Leppie指出了一些我没有意识到的东西，这反而挫伤了我对这个属性的热情：它不指示编译器允许位组合作为枚举变量的有效值，编译器允许这一点用于枚举。我的C++背景显示通过。。。叹气

如果我要进行代码覆盖率爬网，我认为这两个将是最好的：

 [Serializable]
 [WebMethod]

值得一提的是，这里列出了所有.NET属性。有几百个。

我不知道其他人，但我有一些严肃的RTF要做！

DesignerSerializationVisibilityAttribute非常有用。当您在控件或组件上放置运行时属性，并且不希望设计器对其进行序列化时，可以这样使用：

[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public Foo Bar {
    get { return baz; }
    set { baz = value; }
}

我通过CodeSmith生成数据实体类，并为一些验证例程使用属性。下面是一个示例：

/// <summary>
/// Firm ID
/// </summary>
[ChineseDescription("送样单位编号")]
[ValidRequired()]
public string FirmGUID
{
    get { return _firmGUID; }
    set { _firmGUID = value; }
}

我得到了一个实用程序类，根据附加到数据实体类的属性进行验证。代码如下：

namespace Reform.Water.Business.Common
{
/// <summary>
/// Validation Utility
/// </summary>
public static class ValidationUtility
{
    /// <summary>
    /// Data entity validation
    /// </summary>
    /// <param name="data">Data entity object</param>
    /// <returns>return true if the object is valid, otherwise return false</returns>
    public static bool Validate(object data)
    {
        bool result = true;
        PropertyInfo[] properties = data.GetType().GetProperties();
        foreach (PropertyInfo p in properties)
        {
            //Length validatioin
            Attribute attribute = Attribute.GetCustomAttribute(p,typeof(ValidLengthAttribute), false);
            if (attribute != null)
            {
                ValidLengthAttribute validLengthAttribute = attribute as ValidLengthAttribute;
                if (validLengthAttribute != null)
                {
                    int maxLength = validLengthAttribute.MaxLength;
                    int minLength = validLengthAttribute.MinLength;
                    string stringValue = p.GetValue(data, null).ToString();
                    if (stringValue.Length < minLength || stringValue.Length > maxLength)
                    {
                        return false;
                    }
                }
            }
            //Range validation
            attribute = Attribute.GetCustomAttribute(p,typeof(ValidRangeAttribute), false);
            if (attribute != null)
            {
                ValidRangeAttribute validRangeAttribute = attribute as ValidRangeAttribute;
                if (validRangeAttribute != null)
                {
                    decimal maxValue = decimal.MaxValue;
                    decimal minValue = decimal.MinValue;
                    decimal.TryParse(validRangeAttribute.MaxValueString, out maxValue);
                    decimal.TryParse(validRangeAttribute.MinValueString, out minValue);
                    decimal decimalValue = 0;
                    decimal.TryParse(p.GetValue(data, null).ToString(), out decimalValue);
                    if (decimalValue < minValue || decimalValue > maxValue)
                    {
                        return false;
                    }
                }
            }
            //Regex validation
            attribute = Attribute.GetCustomAttribute(p,typeof(ValidRegExAttribute), false);
            if (attribute != null)
            {
                ValidRegExAttribute validRegExAttribute = attribute as ValidRegExAttribute;
                if (validRegExAttribute != null)
                {
                    string objectStringValue = p.GetValue(data, null).ToString();
                    string regExString = validRegExAttribute.RegExString;
                    Regex regEx = new Regex(regExString);
                    if (regEx.Match(objectStringValue) == null)
                    {
                        return false;
                    }
                }
            }
            //Required field validation
            attribute = Attribute.GetCustomAttribute(p,typeof(ValidRequiredAttribute), false);
            if (attribute != null)
            {
                ValidRequiredAttribute validRequiredAttribute = attribute as ValidRequiredAttribute;
                if (validRequiredAttribute != null)
                {
                    object requiredPropertyValue = p.GetValue(data, null);
                    if (requiredPropertyValue == null || string.IsNullOrEmpty(requiredPropertyValue.ToString()))
                    {
                        return false;
                    }
                }
            }
        }
        return result;
    }
}
}