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  • C#中的DataSet、string、DataTable 、对象转换成Json

    C#中对象,字符串,dataTable、DataReader、DataSet,对象集合转换成Json字符串方法。

    public class ConvertJson
        {
            #region 私有方法
            /// <summary>
            
    /// 过滤特殊字符
            
    /// </summary>
            
    /// <param name="s">字符串</param>
            
    /// <returns>json字符串</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();
                }
                else if (type != typeof(string) && string.IsNullOrEmpty(str))
                {
                    str = "\"" + str + "\"";
                }
                return str;
            }

            #endregion

            #region list转换成JSON
            /// <summary>
            
    /// list转换为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>
            
    /// list转换为json
            
    /// </summary>
            
    /// <typeparam name="T1"></typeparam>
            
    /// <param name="list"></param>
            
    /// <param name="p"></param>
            
    /// <returns></returns>
            private 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">json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 对象集合转换为json
            /// <summary>
            
    /// 对象集合转换为json
            
    /// </summary>
            
    /// <param name="array">对象集合</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 - 11);
                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 - 11);
                jsonString.Append("]");
                return jsonString.ToString();
            }
            #endregion

        } 

        
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  • 原文地址:https://www.cnblogs.com/wggWeb/p/2427078.html
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