JSON转换类

由于做项目需要，需要操作json数据，所以从网上找了相关的代码

public class ConvertJson
{
#region 私有方法
/// <summary>
/// 过滤特殊字符
/// </summary>
private static string String2Json(String s)
{
StringBuilder sb = new StringBuilder();
for (int i = 0; i < s.Length; i++)
{
char c = s.ToCharArray()[i];
switch (c)
{
case '"':
sb.Append("\""); break;
case '\':
sb.Append("\\"); break;
case '/':
sb.Append("\/"); break;
case '':
sb.Append("\b"); break;
case 'f':
sb.Append("\f"); break;
case '
':
sb.Append("\n"); break;
case '
':
sb.Append("\r"); break;
case '	':
sb.Append("\t"); break;
default:
sb.Append(c); break;
}
}
return sb.ToString();
}

/// <summary>
/// 格式化字符型、日期型、布尔型
/// </summary>
private static string StringFormat(string str, Type type)
{
if (type == typeof(string))
{
str = String2Json(str);
str = """ + str + """;
}
else if (type == typeof(DateTime))
{
str = """ + str + """;
}
else if (type == typeof(bool))
{
str = str.ToLower();
}
else if (type != typeof(string) && string.IsNullOrEmpty(str))
{
str = """ + str + """;
}
return str;
}
#endregion

#region List转换成Json
/// <summary>
/// List转换成Json
/// </summary>
public static string ListToJson<T>(IList<T> list)
{
object obj = list[0];
return ListToJson<T>(list, obj.GetType().Name);
}

/// <summary>
/// List转换成Json 
/// </summary>
public static string ListToJson<T>(IList<T> list, string jsonName)
{
StringBuilder Json = new StringBuilder();
if (string.IsNullOrEmpty(jsonName)) jsonName = list[0].GetType().Name;
Json.Append("{"" + jsonName + "":[");
if (list.Count > 0)
{
for (int i = 0; i < list.Count; i++)
{
T obj = Activator.CreateInstance<T>();
PropertyInfo[] pi = obj.GetType().GetProperties();
Json.Append("{");
for (int j = 0; j < pi.Length; j++)
{
Type type = pi[j].GetValue(list[i], null).GetType();
Json.Append(""" + pi[j].Name.ToString() + "":" + StringFormat(pi[j].GetValue(list[i], null).ToString(), type));

if (j < pi.Length - 1)
{
Json.Append(",");
}
}
Json.Append("}");
if (i < list.Count - 1)
{
Json.Append(",");
}
}
}
Json.Append("]}");
return Json.ToString();
}
#endregion

#region 对象转换为Json
/// <summary> 
/// 对象转换为Json 
/// </summary> 
/// <param name="jsonObject">对象</param> 
/// <returns>Json字符串</returns> 
public static string ToJson(object jsonObject)
{
string jsonString = "{";
PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();
for (int i = 0; i < propertyInfo.Length; i++)
{
object objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, null);
string value = string.Empty;
if (objectValue is DateTime || objectValue is Guid || objectValue is TimeSpan)
{
value = "'" + objectValue.ToString() + "'";
}
else if (objectValue is string)
{
value = "'" + ToJson(objectValue.ToString()) + "'";
}
else if (objectValue is IEnumerable)
{
value = ToJson((IEnumerable)objectValue);
}
else
{
value = ToJson(objectValue.ToString());
}
jsonString += """ + ToJson(propertyInfo[i].Name) + "":" + value + ",";
}
jsonString.Remove(jsonString.Length - 1, jsonString.Length);
return jsonString + "}";
}
#endregion

#region 对象集合转换Json
/// <summary> 
/// 对象集合转换Json 
/// </summary> 
/// <param name="array">集合对象</param> 
/// <returns>Json字符串</returns> 
public static string ToJson(IEnumerable array)
{
string jsonString = "[";
foreach (object item in array)
{
jsonString += ToJson(item) + ",";
}
jsonString.Remove(jsonString.Length - 1, jsonString.Length);
return jsonString + "]";
}
#endregion

#region 普通集合转换Json
/// <summary> 
/// 普通集合转换Json 
/// </summary> 
/// <param name="array">集合对象</param> 
/// <returns>Json字符串</returns> 
public static string ToArrayString(IEnumerable array)
{
string jsonString = "[";
foreach (object item in array)
{
jsonString = ToJson(item.ToString()) + ",";
}
jsonString.Remove(jsonString.Length - 1, jsonString.Length);
return jsonString + "]";
}
#endregion

#region DataSet转换为Json
/// <summary> 
/// DataSet转换为Json 
/// </summary> 
/// <param name="dataSet">DataSet对象</param> 
/// <returns>Json字符串</returns> 
public static string ToJson(DataSet dataSet)
{
string jsonString = "{";
foreach (DataTable table in dataSet.Tables)
{
jsonString += """ + table.TableName + "":" + ToJson(table) + ",";
}
jsonString = jsonString.TrimEnd(',');
return jsonString + "}";
}
#endregion

#region Datatable转换为Json
/// <summary> 
/// Datatable转换为Json 
/// </summary> 
/// <param name="table">Datatable对象</param> 
/// <returns>Json字符串</returns> 
public static string ToJson(DataTable dt)
{
StringBuilder jsonString = new StringBuilder();
jsonString.Append("[");
DataRowCollection drc = dt.Rows;
for (int i = 0; i < drc.Count; i++)
{
jsonString.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
string strKey = dt.Columns[j].ColumnName;
string strValue = drc[i][j].ToString();
Type type = dt.Columns[j].DataType;
jsonString.Append(""" + strKey + "":");
strValue = StringFormat(strValue, type);
if (j < dt.Columns.Count - 1)
{
jsonString.Append(strValue + ",");
}
else
{
jsonString.Append(strValue);
}
}
jsonString.Append("},");
}
jsonString.Remove(jsonString.Length - 1, 1);
jsonString.Append("]");
return jsonString.ToString();
}

/// <summary>
/// DataTable转换为Json 
/// </summary>
public static string ToJson(DataTable dt, string jsonName)
{
StringBuilder Json = new StringBuilder();
if (string.IsNullOrEmpty(jsonName)) jsonName = dt.TableName;
Json.Append("{"" + jsonName + "":[");
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
Json.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
Type type = dt.Rows[i][j].GetType();
Json.Append(""" + dt.Columns[j].ColumnName.ToString() + "":" + StringFormat(dt.Rows[i][j].ToString(), type));
if (j < dt.Columns.Count - 1)
{
Json.Append(",");
}
}
Json.Append("}");
if (i < dt.Rows.Count - 1)
{
Json.Append(",");
}
}
}
Json.Append("]}");
return Json.ToString();
}
#endregion

#region DataReader转换为Json
/// <summary> 
/// DataReader转换为Json 
/// </summary> 
/// <param name="dataReader">DataReader对象</param> 
/// <returns>Json字符串</returns> 
public static string ToJson(DbDataReader dataReader)
{
StringBuilder jsonString = new StringBuilder();
jsonString.Append("[");
while (dataReader.Read())
{
jsonString.Append("{");
for (int i = 0; i < dataReader.FieldCount; i++)
{
Type type = dataReader.GetFieldType(i);
string strKey = dataReader.GetName(i);
string strValue = dataReader[i].ToString();
jsonString.Append(""" + strKey + "":");
strValue = StringFormat(strValue, type);
if (i < dataReader.FieldCount - 1)
{
jsonString.Append(strValue + ",");
}
else
{
jsonString.Append(strValue);
}
}
jsonString.Append("},");
}
dataReader.Close();
jsonString.Remove(jsonString.Length - 1, 1);
jsonString.Append("]");
return jsonString.ToString();
}
#endregion
}

由于没有详细的测试，大家看着使用。

出处：http://www.cnblogs.com/moxuanshang/p/4645867.html

================================================================

自己项目中的使用的转换类，供参考使用：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization.Json;
using System.Text;
using System.IO;

namespace ToolsUse.CommonHelper
{
    #region public static class JSON 解析JSON数据帮助类，仿Javascript风格
    /// <summary> 
    /// 解析JSON数据帮助类，仿Javascript风格 
    /// </summary> 
    public static class JSON
    {
        #region 把JSON字符串解析为泛型集合,示范: List<GoodsItem> _items = JSON.Parse<List<GoodsItem>>(jsonString);

        /// <summary>
        /// 把JSON字符串解析为指定类型，如泛型集合List&lt;T&gt;或数组Person[]
        /// </summary>
        /// <typeparam name="T">指定返回的对象类型</typeparam>
        /// <param name="jsonString">需要转换的Json字符串</param>
        /// <returns></returns>
        public static T Parse<T>(string jsonString)
        {
            // 用法:  
            // 转换为数组 ： Parse<Person[]>(jsonString); 
            // 转换为集合 ： Parse<List<Person>>(jsonString);
            using (var ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString)))
            {
                return (T)new DataContractJsonSerializer(typeof(T)).ReadObject(ms);
            }
        }
        #endregion

        #region 把对象解析为JSON字符串
        /// <summary>
        /// 把对象解析为JSON字符串
        /// </summary>
        /// <param name="jsonObject"></param>
        /// <returns></returns>
        public static string FormatString(object jsonObject)
        {
            using (var ms = new MemoryStream())
            {
                new DataContractJsonSerializer(jsonObject.GetType()).WriteObject(ms, jsonObject);
                return Encoding.UTF8.GetString(ms.ToArray());
            }
        }
        #endregion
    }

    #endregion
}