C#文件操作类分享

本文实例为大家分享了c#文件操作类的具体代码，供大家参考，具体内容如下

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
 /// <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 '\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>
 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
 }
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。