using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text;
using System.Data;
using System.Reflection;
using System.Collections;
using System.Data.Common;
namespace Common
{
//Json转化类
public class ConvertToJson
{
#region 私有方法
private static string StringToJson(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 '\b':
sb.Append("\\b");
break;
case '\f':
sb.Append("\\f");
break;
case'\n':
sb.Append("\\n");
break;
case '\r':
sb.Append("\\r");
break;
case '\t':
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>
/// <param name="str"></param>
/// <param name="type"></param>
/// <returns></returns>
private static string StringFormat(string str,Type type)
{
if(type==typeof(string))
{
str = StringToJson(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转化成Json
public static string ListToJson<T>(IList<T> list)
{
object obj = list[0];
return ListToJson<T>(list, obj.GetType().Name);
}
private 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 < pi.Length - 1)
{
Json.Append(",");
}
}
}
Json.Append("]}");
return Json.ToString();
}
#endregion
#region 对象转换为Json
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
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 普通集合转换为Json
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Json
public static string ToJson(DataSet dataSet)
{
string jsonString = "[";
foreach(DataTable table in dataSet.Tables)
{
jsonString += "\""+table.TableName+"\":"+ToJson(table)+",";
}
jsonString = jsonString.TrimEnd(',');
return jsonString + "]";
}
/// <summary>
/// DataTable转换为Json
/// </summary>
/// <param name="dt"></param>
/// <returns></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,jsonString.Length);
jsonString.Append("]");
return jsonString.ToString();
}
/// <summary>
/// DataTable转换为Json
/// </summary>
/// <param name="dt"></param>
/// <param name="jsonName"></param>
/// <returns></returns>
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(i<dt.Rows.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
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,jsonString.Length);
jsonString.Append("]");
return jsonString.ToString();
}
#endregion
}
}
