142 lines
4.3 KiB
C#
142 lines
4.3 KiB
C#
using IRaCIS.Core.Infrastructure.NewtonsoftJson;
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using Newtonsoft.Json;
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using Newtonsoft.Json.Serialization;
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using System;
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using System.Collections.Generic;
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using System.Diagnostics.CodeAnalysis;
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using System.Linq;
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using System.Reflection;
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using System.Reflection.Metadata;
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namespace IRaCIS.Core.API
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{
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/// <summary>
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/// LowerCamelCaseJsonAttribute 可以设置类小写返回给前端
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/// </summary>
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public class NullToEmptyStringResolver : DefaultContractResolver
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{
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protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
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{
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// 检查类是否有 LowerCamelCaseJsonAttribute 标记 有的话，属性名小写
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if (type.GetCustomAttribute<LowerCamelCaseJsonAttribute>() != null)
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{
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base.NamingStrategy = new LowerCamelCaseNamingStrategy();
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}
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else
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{
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base.NamingStrategy = null;
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}
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IList<JsonProperty> properties = base.CreateProperties(type, memberSerialization);
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var list = type.GetProperties()
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.Select(p =>
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{
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var jp = base.CreateProperty(p, memberSerialization);
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jp.ValueProvider = new NullToEmptyStringValueProvider(p);
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return jp;
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}).ToList();
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var uu = list.Select(t => t.PropertyName).ToList();
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//获取复杂对象属性
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properties = properties.TakeWhile(t => !uu.Contains(t.PropertyName)).ToList();
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list.AddRange(properties);
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return list;
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}
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}
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public class NullToEmptyStringValueProvider : IValueProvider
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{
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PropertyInfo _memberInfo;
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private readonly bool _isNullable;
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public NullToEmptyStringValueProvider(PropertyInfo memberInfo)
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{
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_memberInfo = memberInfo;
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}
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// DTO → JSON 返回前端的时候 处理null 变为"" 方便前端判断
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public object GetValue(object target)
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{
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var result = _memberInfo.GetValue(target);
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// 检查类型是否为string或string?
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if (_memberInfo.PropertyType == typeof(string) && result == null)
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{
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#region 返回的时候处理 string string? null 为"" 不区分处理
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//// 如果是string?类型，返回null 可以做到，但是得反射，因为 string string? 是编译层区分的
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//var isNullable1 = _memberInfo.CustomAttributes
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// .Any(a => a.AttributeType.Name == "NullableAttribute");
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////var isNullable2 = _memberInfo.CustomAttributes
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//// .Any(a => a.AttributeType.FullName == "System.Runtime.CompilerServices.NullableAttribute");
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//if (isNullable1)
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//{
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// return result;
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//}
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#endregion
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// 如果是string类型，返回空字符串
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return string.Empty;
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}
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return result;
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}
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//影响 模型绑定时接收前端的值，同时影响 正常 JSON 序列化
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public void SetValue(object target, object value)
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{
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#region 前端针对 string 类型的变量，如果传递null 会报错必传
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if (_memberInfo.PropertyType == typeof(string))
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{
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_memberInfo.SetValue(target, value == null ? string.Empty : value);
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}
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else
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{
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_memberInfo.SetValue(target, value);
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}
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#endregion
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#region 处理模型验证区分 string string?
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//var isNullable1 = _memberInfo.CustomAttributes.Any(a => a.AttributeType.Name == "NullableAttribute");
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////不影响 string? 传递null 变为""
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//if (_memberInfo.PropertyType == typeof(string) && isNullable1 == false)
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//{
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// //如果不处理 前段传递null string不会接收，说前段没传递会验证报错
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// _memberInfo.SetValue(target, value == null ? string.Empty : value);
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//}
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//else
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//{
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// _memberInfo.SetValue(target, value);
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//}
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#endregion
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}
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}
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}
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