现在应该经常用到记录操作日志，修改和新增必定涉及到两个实体的属性值的变动。
利用反射，将变动记录下来。
切记，类中的属性字段上面需要打上Description标签：
例如：
/// <summary>
/// 最后修改时间
/// </summary>
[Description("最后修改时间")]
public DateTime PIUpdateTime { get; set; }
相关代码直接附上：
public class OprateLogHelper
{
/// <summary>
/// 获取两个对象间的值发生变化的描述
/// </summary>
/// <typeparam name="T">T</typeparam>
/// <param name="obj1">变化前的对象</param>
/// <param name="obj2">变化后的对象</param>
/// <param name="isDes">是否过滤掉没有[Description]标记的</param>
/// <returns>字符串</returns>
public static string GetObjCompareString<T>(T obj1, T obj2, bool isDes) where T : new()
{
string res = string.Empty;
if (obj1 == null || obj2 == null)
{
return res;
}
var properties =
from property in typeof(T).GetProperties(BindingFlags.Instance | BindingFlags.Public)
select property; string objVal1 = string.Empty;
string objVal2 = string.Empty; foreach (var property in properties)
{
var ingoreCompare = Attribute.GetCustomAttribute(property, typeof(IngoreCompareAttribute));
if (ingoreCompare != null)
{
continue;
} objVal1 = property.GetValue(obj1, null) == null ? string.Empty : property.GetValue(obj1, null).ToString();
objVal2 = property.GetValue(obj2, null) == null ? string.Empty : property.GetValue(obj2, null).ToString(); string des = string.Empty;
DescriptionAttribute descriptionAttribute = ((DescriptionAttribute)Attribute.GetCustomAttribute(property, typeof(DescriptionAttribute)));
if (descriptionAttribute != null)
{
des = ((DescriptionAttribute)Attribute.GetCustomAttribute(property, typeof(DescriptionAttribute))).Description;// 属性值
}
if (isDes && descriptionAttribute == null)
{
continue;
}
if (!objVal1.Equals(objVal2))
{
res += (string.IsNullOrEmpty(des) ? property.Name : des) + ":" + objVal1 + "->" + objVal2 + "； ";
} }
return res;
}
}
/// <summary>
/// 加入些特性后，在实体差异比较中会忽略该属性
/// </summary>
[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
public class IngoreCompareAttribute : Attribute
{
public IngoreCompareAttribute()
{
Flag = true;
} public bool Flag { get; set; }
}
用到时，直接调用GetObjCompareString方法即可。