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  • Asp.Net Core 下 Newtonsoft.Json 转换字符串 null 替换成string.Empty

     public class NullToEmptyStringResolver : DefaultContractResolver
        {
            /// <summary>
            /// 创建属性
            /// </summary>
            /// <param name="type">类型</param>
            /// <param name="memberSerialization">序列化成员</param>
            /// <returns></returns>
            protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
            {
                return type.GetProperties()
                    .Select(x =>
                    {
                        var property = CreateProperty(x, memberSerialization);
                        property.ValueProvider = new NullToEmptyStringValueProvider(x);
                        return property;
                    }).ToList();
            }
    
            /// <inheritdoc />
            /// <summary>
            /// 小写
            /// </summary>
            /// <param name="propertyName"></param>
            /// <returns></returns>
            protected override string ResolvePropertyName(string propertyName)
            {
                return propertyName.ToLower();
            }
        }
    public class NullToEmptyStringValueProvider : IValueProvider
        {
            private readonly PropertyInfo _memberInfo;
    
            /// <summary>
            /// 构造函数
            /// </summary>
            /// <param name="memberInfo"></param>
            public NullToEmptyStringValueProvider(PropertyInfo memberInfo)
            {
                _memberInfo = memberInfo;
            }
    
            /// <inheritdoc />
            /// <summary>
            /// 获取Value
            /// </summary>
            /// <param name="target"></param>
            /// <returns></returns>
            public object GetValue(object target)
            {
                var result = _memberInfo.GetValue(target);
                if (_memberInfo.PropertyType == typeof(string) && result == Convert.DBNull)
                {
                    result = string.Empty;
                }
    
                return result;
    
            }
    
            /// <inheritdoc />
            /// <summary>
            /// 设置Value
            /// </summary>
            /// <param name="target"></param>
            /// <param name="value"></param>
            public void SetValue(object target, object value)
            {
                _memberInfo.SetValue(target, value);
            }
        }

     

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  • 原文地址:https://www.cnblogs.com/FanTaoLin/p/10081891.html
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