mirror of
https://github.com/RRQM/TouchSocket.git
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271 lines
9.8 KiB
C#
271 lines
9.8 KiB
C#
//------------------------------------------------------------------------------
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// 此代码版权（除特别声明或在RRQMCore.XREF命名空间的代码）归作者本人若汝棋茗所有
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// 源代码使用协议遵循本仓库的开源协议及附加协议，若本仓库没有设置，则按MIT开源协议授权
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// CSDN博客：https://blog.csdn.net/qq_40374647
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// 哔哩哔哩视频：https://space.bilibili.com/94253567
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// Gitee源代码仓库：https://gitee.com/RRQM_Home
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// Github源代码仓库：https://github.com/RRQM
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// API首页：https://www.yuque.com/eo2w71/rrqm
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// 交流QQ群：234762506
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// 感谢您的下载和使用
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//------------------------------------------------------------------------------
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//------------------------------------------------------------------------------
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#region License
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// Copyright (c) 2007 James Newton-King
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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#endregion License
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#if HAVE_ADO_NET
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using System.Collections;
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using System.Collections.Generic;
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using System.Globalization;
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using RRQMCore.XREF.Newtonsoft.Json.Utilities;
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using System;
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using System.Data;
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using RRQMCore.XREF.Newtonsoft.Json.Serialization;
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namespace RRQMCore.XREF.Newtonsoft.Json.Converters
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{
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/// <summary>
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/// Converts a <see cref="DataTable"/> to and from JSON.
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/// </summary>
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public class DataTableConverter : JsonConverter
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{
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/// <summary>
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/// Writes the JSON representation of the object.
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/// </summary>
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/// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>
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/// <param name="value">The value.</param>
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/// <param name="serializer">The calling serializer.</param>
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public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
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{
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if (value == null)
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{
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writer.WriteNull();
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return;
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}
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DataTable table = (DataTable)value;
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DefaultContractResolver resolver = serializer.ContractResolver as DefaultContractResolver;
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writer.WriteStartArray();
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foreach (DataRow row in table.Rows)
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{
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writer.WriteStartObject();
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foreach (DataColumn column in row.Table.Columns)
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{
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object columnValue = row[column];
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if (serializer.NullValueHandling == NullValueHandling.Ignore && (columnValue == null || columnValue == DBNull.Value))
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{
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continue;
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}
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writer.WritePropertyName((resolver != null) ? resolver.GetResolvedPropertyName(column.ColumnName) : column.ColumnName);
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serializer.Serialize(writer, columnValue);
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}
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writer.WriteEndObject();
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}
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writer.WriteEndArray();
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}
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/// <summary>
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/// Reads the JSON representation of the object.
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/// </summary>
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/// <param name="reader">The <see cref="JsonReader"/> to read from.</param>
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/// <param name="objectType">Type of the object.</param>
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/// <param name="existingValue">The existing value of object being read.</param>
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/// <param name="serializer">The calling serializer.</param>
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/// <returns>The object value.</returns>
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public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
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{
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if (reader.TokenType == JsonToken.Null)
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{
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return null;
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}
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if (!(existingValue is DataTable dt))
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{
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// handle typed datasets
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dt = (objectType == typeof(DataTable))
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? new DataTable()
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: (DataTable)Activator.CreateInstance(objectType);
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}
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// DataTable is inside a DataSet
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// populate the name from the property name
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if (reader.TokenType == JsonToken.PropertyName)
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{
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dt.TableName = (string)reader.Value;
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reader.ReadAndAssert();
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if (reader.TokenType == JsonToken.Null)
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{
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return dt;
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}
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}
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if (reader.TokenType != JsonToken.StartArray)
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{
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throw JsonSerializationException.Create(reader, "Unexpected JSON token when reading DataTable. Expected StartArray, got {0}.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
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}
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reader.ReadAndAssert();
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while (reader.TokenType != JsonToken.EndArray)
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{
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CreateRow(reader, dt, serializer);
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reader.ReadAndAssert();
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}
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return dt;
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}
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private static void CreateRow(JsonReader reader, DataTable dt, JsonSerializer serializer)
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{
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DataRow dr = dt.NewRow();
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reader.ReadAndAssert();
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while (reader.TokenType == JsonToken.PropertyName)
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{
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string columnName = (string)reader.Value;
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reader.ReadAndAssert();
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DataColumn column = dt.Columns[columnName];
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if (column == null)
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{
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Type columnType = GetColumnDataType(reader);
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column = new DataColumn(columnName, columnType);
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dt.Columns.Add(column);
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}
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if (column.DataType == typeof(DataTable))
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{
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if (reader.TokenType == JsonToken.StartArray)
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{
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reader.ReadAndAssert();
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}
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DataTable nestedDt = new DataTable();
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while (reader.TokenType != JsonToken.EndArray)
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{
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CreateRow(reader, nestedDt, serializer);
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reader.ReadAndAssert();
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}
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dr[columnName] = nestedDt;
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}
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else if (column.DataType.IsArray && column.DataType != typeof(byte[]))
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{
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if (reader.TokenType == JsonToken.StartArray)
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{
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reader.ReadAndAssert();
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}
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List<object> o = new List<object>();
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while (reader.TokenType != JsonToken.EndArray)
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{
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o.Add(reader.Value);
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reader.ReadAndAssert();
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}
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Array destinationArray = Array.CreateInstance(column.DataType.GetElementType(), o.Count);
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((IList)o).CopyTo(destinationArray, 0);
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dr[columnName] = destinationArray;
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}
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else
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{
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object columnValue = (reader.Value != null)
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? serializer.Deserialize(reader, column.DataType) ?? DBNull.Value
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: DBNull.Value;
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dr[columnName] = columnValue;
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}
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reader.ReadAndAssert();
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}
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dr.EndEdit();
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dt.Rows.Add(dr);
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}
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private static Type GetColumnDataType(JsonReader reader)
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{
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JsonToken tokenType = reader.TokenType;
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switch (tokenType)
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{
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case JsonToken.Integer:
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case JsonToken.Boolean:
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case JsonToken.Float:
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case JsonToken.String:
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case JsonToken.Date:
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case JsonToken.Bytes:
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return reader.ValueType;
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case JsonToken.Null:
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case JsonToken.Undefined:
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return typeof(string);
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case JsonToken.StartArray:
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reader.ReadAndAssert();
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if (reader.TokenType == JsonToken.StartObject)
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{
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return typeof(DataTable); // nested datatable
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}
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Type arrayType = GetColumnDataType(reader);
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return arrayType.MakeArrayType();
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default:
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throw JsonSerializationException.Create(reader, "Unexpected JSON token when reading DataTable: {0}".FormatWith(CultureInfo.InvariantCulture, tokenType));
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}
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}
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/// <summary>
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/// Determines whether this instance can convert the specified value type.
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/// </summary>
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/// <param name="valueType">Type of the value.</param>
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/// <returns>
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/// <c>true</c> if this instance can convert the specified value type; otherwise, <c>false</c>.
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/// </returns>
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public override bool CanConvert(Type valueType)
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{
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return typeof(DataTable).IsAssignableFrom(valueType);
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}
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}
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}
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#endif |