C#中JSON转换类

不念不忘少年蓝@ 2021-06-26 16:06 446阅读 0赞

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
        }
    }