组件Newtonsoft.Json实现object2json转换

很多情况下，我们需要把数据类型做一些转换，供其它外部的子系统调用。

最为典型的是生成json格式供javascript作调用。

现成的组件Newtonsoft.Json可以实现object2json之间的转换。

Newtonsoft.Json.JavaScriptConvert.SerializeObject(object)可以执行json的序列化，也是反序列化的方法。

常见的场景：

A系统提供用户资料(MemberInfo)给子系统B调用，但用户资料中有些内容是不能公开的，如Email地址。

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直接用Newtonsoft.Json.JavaScriptConvert.SerializeObject好像是不行的，它会把object中的所有属性列出。

我的做法是这样的：

定义一个特性类，该特性类只允许用于类的属性上

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[AttributeUsage(AttributeTargets.Property)]   
    public class DenyReflectionAttrubite : Attribute   
    {   
        public DenyReflectionAttrubite() { }   
    }

[AttributeUsage(AttributeTargets.Property)]
    public class DenyReflectionAttrubite : Attribute
    {
        public DenyReflectionAttrubite() { }
    }

MemberInfo类
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public class MemberInfo   
    {   
        public int Uid   
        {   
            get;   
            set;   
        }   
        public string UserName   
        {   
            get;   
            set;   
        }   
           
        public string NickName   
        {   
            get;   
            set;   
        }   
        [DenyReflectionAttrubite]   
        public string Password   
        {   
            get;   
            set;   
        }   
       [DenyReflectionAttrubite]   
        public string Email   
        {   
            get;   
            set;   
        }   
//.......................   
}

public class MemberInfo
    {
        public int Uid
        {
            get;
            set;
        }
        public string UserName
        {
            get;
            set;
        }
        
        public string NickName
        {
            get;
            set;
        }
        [DenyReflectionAttrubite]
        public string Password
        {
            get;
            set;
        }
       [DenyReflectionAttrubite]
        public string Email
        {
            get;
            set;
        }
//.......................
}

至于DenyReflectionAttrubite特性如何使用，下面就会提出。
json生成
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public void Builder()   
        {   
            using (jsonWriter = new JsonTextWriter(sw))   
            {   
                   
                jsonWriter.Formatting = Formatting.None;   
                jsonWriter.Indentation = 4;   
                jsonWriter.WriteStartObject();   
                   
                jsonWriter.WritePropertyName("member");   
                jsonWriter.WriteStartArray();   
                jsonWriter.WriteStartObject();   
                Type settingsType = this.member.GetType();   
                foreach (PropertyInfo propertyInformation in settingsType.GetProperties())   
                {   
                    try  
                    {   
                        //在这里对DenyReflectionAttrubite特性的属性跳过处理   
                        if (propertyInformation.GetCustomAttributes(typeof(DenyReflectionAttrubite), false).Length > 0) continue;      
                        object propertyValue = propertyInformation.GetValue(member, null);   
                        string valueAsString = propertyValue.ToString();   
                        if (propertyValue.Equals(null))   
                        {   
                            valueAsString = String.Empty;   
                        }   
                        if (propertyValue.Equals(Int32.MinValue))   
                        {   
                            valueAsString = String.Empty;   
                        }   
                        if (propertyValue.Equals(Single.MinValue))   
                        {   
                            valueAsString = String.Empty;   
                        }   
                        jsonWriter.WritePropertyName(propertyInformation.Name.ToLower());   
                        jsonWriter.WriteValue(valueAsString.Trim());   
                    }   
                    catch { }   
  
                }   
  
                jsonWriter.WriteEndObject();   
                jsonWriter.WriteEnd();   
                jsonWriter.WriteEndObject();   
            }   
        }

public void Builder()
        {
            using (jsonWriter = new JsonTextWriter(sw))
            {
                
                jsonWriter.Formatting = Formatting.None;
                jsonWriter.Indentation = 4;
                jsonWriter.WriteStartObject();
                
                jsonWriter.WritePropertyName("member");
                jsonWriter.WriteStartArray();
                jsonWriter.WriteStartObject();
                Type settingsType = this.member.GetType();
                foreach (PropertyInfo propertyInformation in settingsType.GetProperties())
                {
                    try
                    {
                        //在这里对DenyReflectionAttrubite特性的属性跳过处理
                        if (propertyInformation.GetCustomAttributes(typeof(DenyReflectionAttrubite), false).Length > 0) continue;   
                        object propertyValue = propertyInformation.GetValue(member, null);
                        string valueAsString = propertyValue.ToString();
                        if (propertyValue.Equals(null))
                        {
                            valueAsString = String.Empty;
                        }
                        if (propertyValue.Equals(Int32.MinValue))
                        {
                            valueAsString = String.Empty;
                        }
                        if (propertyValue.Equals(Single.MinValue))
                        {
                            valueAsString = String.Empty;
                        }
                        jsonWriter.WritePropertyName(propertyInformation.Name.ToLower());
                        jsonWriter.WriteValue(valueAsString.Trim());
                    }
                    catch { }

}

jsonWriter.WriteEndObject();
                jsonWriter.WriteEnd();
                jsonWriter.WriteEndObject();
            }
        }

转载自:http://www.aspnetjia.com