C# JSON格式化转换辅助类 ConvertJson

可能我们用惯了 newtonsoft.json.dll 等第三方的类库来实现序列化等类似的操作，但是有时只是简单的用一下，感觉没必要那么费事，所谓杀鸡焉用牛刀，自制个小刀即可。

代码分享给大家，如下：

using system;
using system.collections.generic;
using system.text;
using system.data;
using system.reflection;
using system.collections;
using system.data.common;
 
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
}