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。
时间: 2024-10-11 18:05:15