using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Reflection;
using System.Collections;
using System.Data.Common;
namespace DotNet.Utilities
{
//JSON转换类
public class ConvertJson
{
#region 私有方法
///

/// 过滤特殊字符
///

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 \'\\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();
}
///

/// 格式化字符型、日期型、布尔型
///

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
///

/// List转换成Json
///

public static string ListToJson(IList list)
{
object obj = list[0];
return ListToJson(list, obj.GetType().Name);
}
///

/// List转换成Json
///

public static string ListToJson(IList 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();
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
///

/// 对象转换为Json
///

/// 对象
/// Json字符串
public static string ToJson(object jsonObject)
{
string js;
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
///

/// 对象集合转换Json
///

/// 集合对象
/// Json字符串
public static string ToJson(IEnumerable array)
{
string js;
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
///

/// 普通集合转换Json
///

/// 集合对象
/// Json字符串
public static string ToArrayString(IEnumerable array)
{
string js;
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
///

/// DataSet转换为Json
///

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

/// Datatable转换为Json
///

/// Datatable对象
/// Json字符串
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();
}
///

/// DataTable转换为Json
///

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
///

/// DataReader转换为Json
///

/// DataReader对象
/// Json字符串
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
}
}