实用C#中任意类型数据转成JSON格式数据输出(2)

时间:2009-12-21 11:47来源:未知作者:admin 点击: 次

分享到：

/// summary /// DataTable转成Json /// /summary /// param name="jsonName"/param /// param name="dt"/param /// returns/returns public static string ToJson(DataTable dt, string jsonName) { StringBuilde

/// <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;
}