添加viewModel

tangxu

2024-10-22 6a07c4c846ffbb1e93afdf0260e123e4c145f419

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using System;
using System.Globalization;
using DPumpHydr.WinFrmUI.WenSkin.Json.Serialization;
using DPumpHydr.WinFrmUI.WenSkin.Json.Utilities;
 
namespace DPumpHydr.WinFrmUI.WenSkin.Json.Converters
{
    /// <summary>
    /// Converts an Entity Framework EntityKey to and from JSON.
    /// </summary>
    public class EntityKeyMemberConverter : JsonConverter
    {
        private const string EntityKeyMemberFullTypeName = "System.Data.EntityKeyMember";
 
        private const string KeyPropertyName = "Key";
 
        private const string TypePropertyName = "Type";
 
        private const string ValuePropertyName = "Value";
 
        private static ReflectionObject _reflectionObject;
 
        /// <summary>
        /// Writes the JSON representation of the object.
        /// </summary>
        /// <param name="writer">The <see cref="T:Newtonsoft.Json.JsonWriter" /> to write to.</param>
        /// <param name="value">The value.</param>
        /// <param name="serializer">The calling serializer.</param>
        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
        {
            EnsureReflectionObject(value.GetType());
            DefaultContractResolver defaultContractResolver = serializer.ContractResolver as DefaultContractResolver;
            string value2 = (string)_reflectionObject.GetValue(value, "Key");
            object value3 = _reflectionObject.GetValue(value, "Value");
            Type type = value3?.GetType();
            writer.WriteStartObject();
            writer.WritePropertyName((defaultContractResolver != null) ? defaultContractResolver.GetResolvedPropertyName("Key") : "Key");
            writer.WriteValue(value2);
            writer.WritePropertyName((defaultContractResolver != null) ? defaultContractResolver.GetResolvedPropertyName("Type") : "Type");
            writer.WriteValue((type != null) ? type.FullName : null);
            writer.WritePropertyName((defaultContractResolver != null) ? defaultContractResolver.GetResolvedPropertyName("Value") : "Value");
            if (type != null)
            {
                if (JsonSerializerInternalWriter.TryConvertToString(value3, type, out var s))
                {
                    writer.WriteValue(s);
                }
                else
                {
                    writer.WriteValue(value3);
                }
            }
            else
            {
                writer.WriteNull();
            }
            writer.WriteEndObject();
        }
 
        private static void ReadAndAssertProperty(JsonReader reader, string propertyName)
        {
            reader.ReadAndAssert();
            if (reader.TokenType != JsonToken.PropertyName || !string.Equals(reader.Value.ToString(), propertyName, StringComparison.OrdinalIgnoreCase))
            {
                throw new JsonSerializationException("Expected JSON property '{0}'.".FormatWith(CultureInfo.InvariantCulture, propertyName));
            }
        }
 
        /// <summary>
        /// Reads the JSON representation of the object.
        /// </summary>
        /// <param name="reader">The <see cref="T:Newtonsoft.Json.JsonReader" /> to read from.</param>
        /// <param name="objectType">Type of the object.</param>
        /// <param name="existingValue">The existing value of object being read.</param>
        /// <param name="serializer">The calling serializer.</param>
        /// <returns>The object value.</returns>
        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
        {
            EnsureReflectionObject(objectType);
            object obj = _reflectionObject.Creator();
            ReadAndAssertProperty(reader, "Key");
            reader.ReadAndAssert();
            _reflectionObject.SetValue(obj, "Key", reader.Value.ToString());
            ReadAndAssertProperty(reader, "Type");
            reader.ReadAndAssert();
            Type type = Type.GetType(reader.Value.ToString());
            ReadAndAssertProperty(reader, "Value");
            reader.ReadAndAssert();
            _reflectionObject.SetValue(obj, "Value", serializer.Deserialize(reader, type));
            reader.ReadAndAssert();
            return obj;
        }
 
        private static void EnsureReflectionObject(Type objectType)
        {
            if (_reflectionObject == null)
            {
                _reflectionObject = ReflectionObject.Create(objectType, "Key", "Value");
            }
        }
 
        /// <summary>
        /// Determines whether this instance can convert the specified object type.
        /// </summary>
        /// <param name="objectType">Type of the object.</param>
        /// <returns>
        ///     <c>true</c> if this instance can convert the specified object type; otherwise, <c>false</c>.
        /// </returns>
        public override bool CanConvert(Type objectType)
        {
            return objectType.AssignableToTypeName("System.Data.EntityKeyMember");
        }
    }
}