125 lines
4.4 KiB
C#
125 lines
4.4 KiB
C#
#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
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#if HAVE_ADO_NET
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using System;
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using System.Data;
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using LC.Newtonsoft.Json.Serialization;
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namespace LC.Newtonsoft.Json.Converters
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{
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/// <summary>
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/// Converts a <see cref="DataSet"/> to and from JSON.
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/// </summary>
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public class DataSetConverter : 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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DataSet dataSet = (DataSet)value;
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DefaultContractResolver? resolver = serializer.ContractResolver as DefaultContractResolver;
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DataTableConverter converter = new DataTableConverter();
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writer.WriteStartObject();
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foreach (DataTable table in dataSet.Tables)
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{
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writer.WritePropertyName((resolver != null) ? resolver.GetResolvedPropertyName(table.TableName) : table.TableName);
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converter.WriteJson(writer, table, serializer);
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}
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writer.WriteEndObject();
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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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// handle typed datasets
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DataSet ds = (objectType == typeof(DataSet))
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? new DataSet()
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: (DataSet)Activator.CreateInstance(objectType);
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DataTableConverter converter = new DataTableConverter();
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reader.ReadAndAssert();
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while (reader.TokenType == JsonToken.PropertyName)
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{
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DataTable dt = ds.Tables[(string)reader.Value!];
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bool exists = (dt != null);
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dt = (DataTable)converter.ReadJson(reader, typeof(DataTable), dt, serializer)!;
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if (!exists)
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{
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ds.Tables.Add(dt);
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}
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reader.ReadAndAssert();
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}
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return ds;
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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(DataSet).IsAssignableFrom(valueType);
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}
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}
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}
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#endif |