有时候，需要把一个类的相同名称的字段、属性相互赋值，难道要一句一句代码的写？在数据库操作的模型中，视图模型和表模型有一定的字段是同名的，很多时候可能需要从视图模型复制到表模型，或者反过来。。。
重复劳动是比较郁闷，我又比较懒。所以写了个转换器：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Reflection;
using System.Collections;
namespace com.hetaoos.Common.Utils
{
/// <summary>
/// 类属性/字段的值复制工具
/// </summary>
public class ClassValueCopier
{
/// <summary>
/// 复制
/// </summary>
/// <param name="destination">目标</param>
/// <param name="source">来源</param>
/// <returns>成功复制的值个数</returns>
public static int Copy(object destination, object source)
{
if (destination == null || source == null)
{
return 0;
}
return Copy(destination, source, source.GetType());
}
/// <summary>
/// 复制
/// </summary>
/// <param name="destination">目标</param>
/// <param name="source">来源</param>
/// <param name="type">复制的属性字段模板</param>
/// <returns>成功复制的值个数</returns>
public static int Copy(object destination, object source, Type type)
{
return Copy(destination, source, type, null);
}
/// <summary>
/// 复制
/// </summary>
/// <param name="destination">目标</param>
/// <param name="source">来源</param>
/// <param name="type">复制的属性字段模板</param>
/// <param name="excludeName">排除下列名称的属性不要复制</param>
/// <returns>成功复制的值个数</returns>
public static int Copy(object destination, object source, Type type, IEnumerable<string> excludeName)
{
if (destination == null || source == null)
{
return 0;
}
if (excludeName == null)
{
excludeName = new List<string>();
}
int i = 0;
Type desType = destination.GetType();
foreach (FieldInfo mi in type.GetFields())
{
if (excludeName.Contains(mi.Name))
{
continue;
}
try
{
FieldInfo des = desType.GetField(mi.Name);
if (des != null && des.FieldType == mi.FieldType)
{
des.SetValue(destination, mi.GetValue(source));
i++;
}
}
catch
{
}
}
foreach (PropertyInfo pi in type.GetProperties())
{
if (excludeName.Contains(pi.Name))
{
continue;
}
try
{
PropertyInfo des = desType.GetProperty(pi.Name);
if (des != null && des.PropertyType == pi.PropertyType && des.CanWrite && pi.CanRead)
{
des.SetValue(destination, pi.GetValue(source, null), null);
i++;
}
}
catch
{
//throw ex;
}
}
return i;
}
}
#region 扩展方法 For .NET 3.0+
/// <summary>
/// 类属性/字段的值复制工具 扩展方法
/// </summary>
public static class ClassValueCopier2
{
/// <summary>
/// 获取实体类的属性名称
/// </summary>
/// <param name="source">实体类</param>
/// <returns>属性名称列表</returns>
public static List<string> GetPropertyNames(this object source)
{
if (source == null)
{
return new List<string>();
}
return GetPropertyNames(source.GetType());
}
/// <summary>
/// 获取类类型的属性名称（按声明顺序）
/// </summary>
/// <param name="source">类类型</param>
/// <returns>属性名称列表</returns>
public static List<string> GetPropertyNames(this Type source)
{
return GetPropertyNames(source, true);
}
/// <summary>
/// 获取类类型的属性名称
/// </summary>
/// <param name="source">类类型</param>
/// <param name="declarationOrder">是否按声明顺序排序</param>
/// <returns>属性名称列表</returns>
public static List<string> GetPropertyNames(this Type source, bool declarationOrder)
{
if (source == null)
{
return new List<string>();
}
var list = source.GetProperties().AsQueryable();
if (declarationOrder)
{
list = list.OrderBy(p => p.MetadataToken);
}
return list.Select(o => o.Name).ToList(); ;
}
/// <summary>
/// 从源对象赋值到当前对象
/// </summary>
/// <param name="destination">当前对象</param>
/// <param name="source">源对象</param>
/// <returns>成功复制的值个数</returns>
public static int CopyValueFrom(this object destination, object source)
{
return CopyValueFrom(destination, source, null);
}
/// <summary>
/// 从源对象赋值到当前对象
/// </summary>
/// <param name="destination">当前对象</param>
/// <param name="source">源对象</param>
/// <param name="excludeName">排除下列名称的属性不要复制</param>
/// <returns>成功复制的值个数</returns>
public static int CopyValueFrom(this object destination, object source, IEnumerable<string> excludeName)
{
if (destination == null || source == null)
{
return 0;
}
return ClassValueCopier.Copy(destination, source, source.GetType(), excludeName);
}
/// <summary>
/// 从当前对象赋值到目标对象
/// </summary>
/// <param name="source">当前对象</param>
/// <param name="destination">目标对象</param>
/// <returns>成功复制的值个数</returns>
public static int CopyValueTo(this object source, object destination)
{
return CopyValueTo(destination, source, null);
}
/// <summary>
/// 从当前对象赋值到目标对象
/// </summary>
/// <param name="source">当前对象</param>
/// <param name="destination">目标对象</param>
/// <param name="excludeName">排除下列名称的属性不要复制</param>
/// <returns>成功复制的值个数</returns>
public static int CopyValueTo(this object source, object destination, IEnumerable<string> excludeName)
{
if (destination == null || source == null)
{
return 0;
}
return ClassValueCopier.Copy(destination, source, source.GetType(), excludeName);
}
}
#endregion
}
说明：
1，只能复制相同名称，相同类型的字段、属性
2，可以选择只复制某个父类、接口下的字段和属性
3，如果你的 .NET 版本不是 3.0及以上，得删掉扩展方法和 Linq 的引用
关联文章:
Null 回复:
十一月 15th, 2010 at 13:36
你是指 Linq2Sql 或者 Entity Framework 中生成的数据模型。想过滤其中自动生成的外键？
记得外键都是些 class，好像还继承了 INotifyPropertyChanging, INotifyPropertyChanged。
可以通过 获取值的类型，判断是不是 以上2个类的子类来过滤～
当然，由于是和数据库对应的，那么数据库中字段的类型是固定那几种，你可以加个过滤，把非特定值类型的属性过滤掉～
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