.NET JSON扩展

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9月27

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06:14tommyhu

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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 static class 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 static string ToJson(this object 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 is string || objectValue is Guid || objectValue is TimeSpan)
                {
                    jsonBuilder.Append("'");
                    jsonBuilder.Append(objectValue);
                    jsonBuilder.Append("'");
                }
                else if (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 static string 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 static string 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 static string 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 static string 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();
        }
    }
}

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