.NET JSON扩展

在南京工作时，自己写了个将常用数据转换成json的扩展。今天查找文件时找到了，就把它放上来，免得以后用着时找不到。

毕竟很久之前写的，当时水平所限，漏洞肯定不少。但最近忙，没空改它，就先放着，博客园上的东西应该不会丢^_^

namespace JavenSoft.Extension
{
    using System;
    using System.Collections.Generic;
    using System.Text;
    using System.Reflection;
    using System.Collections;
    using System.Data;
    using System.Data.Common;

    ///<summary> 
    /// 常用数据类型Json扩展 
    /// 用于将常用的数据类型转换为Json对象
    ///</summary>
    public staticclass JsonExtension
    {
        ///<summary>
        /// 把指定的对象转换为Json字符串 
        ///</summary> 
        ///<param name="source">要转换的对象</param>
        ///<returns>Json字符串</returns>
        public staticstring ToJson(thisobject source)
        {
            StringBuilder jsonBuilder =new StringBuilder();
            jsonBuilder.Append("{");

            PropertyInfo[] propertyInfo = source.GetType().GetProperties();

            for (int i =0; i < propertyInfo.Length; i++)
            {
                object objectValue = propertyInfo[i].GetGetMethod().Invoke(source, null);

                jsonBuilder.Append("\"");
                jsonBuilder.Append(propertyInfo[i].Name);
                jsonBuilder.Append("\":");

                string value =string.Empty;
                if (objectValue is DateTime || objectValue isstring|| objectValue is Guid || objectValue is TimeSpan)
                {
                    jsonBuilder.Append("'");
                    jsonBuilder.Append(objectValue);
                    jsonBuilder.Append("'");
                }
                elseif (objectValue is IEnumerable)
                {
                    jsonBuilder.Append((objectValue as IEnumerable).ToJson());
                }
                else
                {
                    jsonBuilder.Append(objectValue.ToJson());
                }

                jsonBuilder.Append(value);
                jsonBuilder.Append(",");
            }

            jsonBuilder.RemoveLast();
            jsonBuilder.Append("}");
            return jsonBuilder.ToString();
        }
        ///<summary>
        /// 对象集合转换Json
        ///</summary>
        ///<param name="source">集合对象</param> 
        ///<returns>Json字符串</returns>
        public staticstring ToJson<T>(this IEnumerable<T> source) where T : class
        {
            StringBuilder jsonBuilder =new StringBuilder();
            jsonBuilder.Append("[");

            foreach (object item in source)
            {
                jsonBuilder.Append(item.ToJson());
                jsonBuilder.Append(",");
            }
            jsonBuilder.RemoveLast();
            jsonBuilder.Append("]");

            return jsonBuilder.ToString();
        }
        ///<summary> 
        /// Datatable转换为Json
        ///</summary> 
        ///<param name="table">Datatable对象</param> 
        ///<returns>Json字符串</returns>
        public staticstring ToJson(this DataTable table)
        {
            StringBuilder jsonBuilder =new StringBuilder();
            jsonBuilder.Append("[");

            DataRowCollection drc = table.Rows;
            for (int i =0; i < drc.Count; i++)
            {
                jsonBuilder.Append("{");
                foreach (DataColumn column in table.Columns)
                {
                    jsonBuilder.Append("\"");
                    jsonBuilder.Append(column.ColumnName);
                    jsonBuilder.Append("\":");

                    if (column.DataType ==typeof(DateTime) || column.DataType ==typeof(string))
                    {
                        jsonBuilder.Append("\"");
                        jsonBuilder.Append(drc[i][column.ColumnName]);
                        jsonBuilder.Append("\",");
                    }
                    else
                    {
                        jsonBuilder.Append(drc[i][column.ColumnName]);
                        jsonBuilder.Append(",");
                    }
                }
                jsonBuilder.RemoveLast();
                jsonBuilder.Append("},");
            }

            jsonBuilder.RemoveLast();

            jsonBuilder.Append("]");
            return jsonBuilder.ToString();
        }
        ///<summary> 
        /// DataReader转换为Json 
        ///</summary> 
        ///<param name="dataReader">DataReader对象</param> 
        ///<returns>Json字符串</returns>
        public staticstring ToJson(this DbDataReader dataReader)
        {           
            StringBuilder jsonBuilder =new StringBuilder();
            jsonBuilder.Append("[");

            while (dataReader.Read())
            {
                jsonBuilder.Append("{");

                for (int i =0; i < dataReader.FieldCount; i++)
                {
                    jsonBuilder.Append("\"");
                    jsonBuilder.Append(dataReader.GetName(i));
                    jsonBuilder.Append("\":");

                    if (dataReader.GetFieldType(i) ==typeof(DateTime) || dataReader.GetFieldType(i) ==typeof(string))
                    {
                        jsonBuilder.Append("\"");
                        jsonBuilder.Append(dataReader[i]);
                        jsonBuilder.Append("\",");
                    }
                    else
                    {
                        jsonBuilder.Append(dataReader[i]);
                        jsonBuilder.Append(",");
                    }
                }
                jsonBuilder.RemoveLast();
                jsonBuilder.Append("}");
            }
            dataReader.Close();
            jsonBuilder.RemoveLast();
            jsonBuilder.Append("]");

            return jsonBuilder.ToString();
        }
        ///<summary>
        /// DataSet转换为Json
        ///</summary>
        ///<param name="dataSet">DataSet对象</param> 
        ///<returns>Json字符串</returns>
        public staticstring ToString(this DataSet dataSet)
        {
            StringBuilder jsonBuilder =new StringBuilder();
            jsonBuilder.Append("{");

            foreach (DataTable table in dataSet.Tables)
            {
                jsonBuilder.Append("\"");
                jsonBuilder.Append(table.TableName);
                jsonBuilder.Append("\":");
                jsonBuilder.Append(table.ToJson());
                jsonBuilder.Append(",");
            }

            jsonBuilder.RemoveLast();
            jsonBuilder.Append("}");

            return jsonBuilder.ToString();
        }
    }
}

这里面还用到了另一个扩展，因为都是使用频率特别高的方法，所以做成扩展也不错

namespace JavenSoft.Extension
{
    using System.Text;
    publicstaticclass StringBuilderExtension
    {
        ///<summary>
        /// 删除结尾字符
        ///</summary> 
        ///<param name="source">需要删除的字符</param>
        ///<returns>完成后的StringBuilder对象</returns>
        public static StringBuilder RemoveLast(this StringBuilder source)
        {
            return source.RemoveLast(1);
        }
        ///<summary>
        /// 删除结尾字符
        ///</summary> 
        ///<param name="source">需要删除的字符</param>
        ///<param name="length">要删除的长度</param>
        ///<returns>完成后的StringBuilder对象</returns>
        public static StringBuilder RemoveLast(this StringBuilder source, int length)
        {
            if (source.Length >= length)
            {
                return source.Remove(source.Length - length, length);
            }
            return source;
        }
    }
}