c#操作json数据的工具类

/// <summary>   
/// List转成json    
/// </summary>   
/// <typeparam name="T"></typeparam>   
/// <param name="jsonName"></param>   
/// <param name="list"></param>   
/// <returns></returns>   
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();   
}   
  
/// <summary>   
/// List转成json    
/// </summary>   
/// <typeparam name="T"></typeparam>   
/// <param name="list"></param>   
/// <returns></returns>   
public static string ListToJson<T>(IList<T> list)   
{   
 object obj = list[0];   
 return ListToJson<T>(list, obj.GetType().Name);   
}   
  
/// <summary>    
/// 对象转换为Json字符串    
/// </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 + "}";   
}   
  
/// <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 + "]";   
}   
  
/// <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 + "]";   
}   
  
/// <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转成Json    
/// </summary>   
/// <param name="jsonName"></param>   
/// <param name="dt"></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 (j < dt.Columns.Count - 1)   
    {   
     Json.Append(",");   
    }   
   }   
   Json.Append("}");   
   if (i < dt.Rows.Count - 1)   
   {   
    Json.Append(",");   
   }   
  }   
 }   
 Json.Append("]}");   
 return Json.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(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();   
}   
  
/// <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 + "}";   
}   
  
/// <summary>   
/// 过滤特殊字符   
/// </summary>   
/// <param name="s"></param>   
/// <returns></returns>   
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();   
}   
  
/// <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 = String2Json(str);   
  str = "\"" + str + "\"";   
 }   
 else if (type == typeof(DateTime))   
 {   
  str = "\"" + str + "\"";   
 }   
 else if (type == typeof(bool))   
 {   
  str = str.ToLower();   
 }   
 return str;   
}

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