92 lines
4.2 KiB
C#
92 lines
4.2 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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using System.Threading.Tasks;
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namespace SamplePre.Common.Helper
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{
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/// <summary>
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/// 实体对象复制工具类（反射实现）
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/// 适配.NET Framework 4.8，支持同实体/不同实体间同名字段值复制（浅拷贝）
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/// </summary>
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public static class ObjectCopyHelper
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{
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/// <summary>
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/// 核心方法：将源对象的同名字段值复制到目标对象
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/// </summary>
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/// <typeparam name="TSource">源对象类型</typeparam>
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/// <typeparam name="TTarget">目标对象类型</typeparam>
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/// <param name="source">源对象（提供值）</param>
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/// <param name="target">目标对象（接收值，需提前实例化）</param>
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/// <param name="ignoreCase">是否忽略属性名大小写（默认true：Name和name视为同一个）</param>
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/// <param name="ignoreNull">是否忽略源对象的null值（默认false：源null会覆盖目标值）</param>
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public static void CopyProperties<TSource, TTarget>(this TSource source, TTarget target,
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bool ignoreCase = true, bool ignoreNull = false)
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where TSource : class // 源对象不能为空引用类型
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where TTarget : class // 目标对象不能为空引用类型
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{
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// 空值校验
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if (source == null) throw new ArgumentNullException(nameof(source), "源对象不能为null");
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if (target == null) throw new ArgumentNullException(nameof(target), "目标对象不能为null");
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// 获取源对象和目标对象的属性信息（仅获取公共可读写属性）
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PropertyInfo[] sourceProps = typeof(TSource).GetProperties(BindingFlags.Public | BindingFlags.Instance);
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PropertyInfo[] targetProps = typeof(TTarget).GetProperties(BindingFlags.Public | BindingFlags.Instance);
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// 遍历源对象的所有属性，匹配目标对象的同名字段
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foreach (PropertyInfo sourceProp in sourceProps)
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{
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// 跳过源对象中不可读的属性（无getter）
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if (!sourceProp.CanRead) continue;
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// 获取源对象当前属性的值
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object sourceValue = sourceProp.GetValue(source, null);
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// 忽略源对象的null值（若开启该配置）
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if (ignoreNull && sourceValue == null) continue;
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// 在目标对象中查找同名字段（支持忽略大小写）
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PropertyInfo targetProp = Array.Find(targetProps, p =>
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string.Equals(p.Name, sourceProp.Name, ignoreCase ? StringComparison.OrdinalIgnoreCase : StringComparison.Ordinal));
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// 目标对象无该属性/目标属性不可写/类型不匹配 → 跳过
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if (targetProp == null || !targetProp.CanWrite
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|| !sourceProp.PropertyType.IsAssignableFrom(targetProp.PropertyType))
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{
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continue;
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}
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// 给目标对象的属性赋值
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targetProp.SetValue(target, sourceValue, null);
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}
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}
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/// <summary>
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/// 重载方法：快速复制（默认忽略大小写、不忽略null）
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/// </summary>
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public static void CopyProperties<TSource, TTarget>(this TSource source, TTarget target)
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where TSource : class
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where TTarget : class
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{
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CopyProperties(source, target, true, false);
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}
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/// <summary>
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/// 便捷方法：创建目标对象并完成复制（一步到位，无需提前实例化目标对象）
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/// </summary>
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public static TTarget CopyToNew<TSource, TTarget>(this TSource source,
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bool ignoreCase = true, bool ignoreNull = false)
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where TSource : class
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where TTarget : class, new() // 目标对象必须有无参构造函数
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{
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if (source == null) throw new ArgumentNullException(nameof(source));
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// 实例化目标对象并赋值
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TTarget target = new TTarget();
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source.CopyProperties(target, ignoreCase, ignoreNull);
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return target;
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}
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}
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}
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