44 lines
2.3 KiB
C#
44 lines
2.3 KiB
C#
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using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection;
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namespace BlueWest.Core.Tests
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{
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public static class PocoToDictionary
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{
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private static readonly MethodInfo AddToDicitonaryMethod = typeof(IDictionary<string, object>).GetMethod("Add");
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private static readonly ConcurrentDictionary<Type, Func<object, IDictionary<string, object>>> Converters = new ConcurrentDictionary<Type, Func<object, IDictionary<string, object>>>();
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private static readonly ConstructorInfo DictionaryConstructor = typeof(Dictionary<string, object>).GetConstructors().FirstOrDefault(c => c.IsPublic && !c.GetParameters().Any());
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public static IDictionary<string, object> ToDictionary(this object obj) => obj == null ? null : Converters.GetOrAdd(obj.GetType(), o =>
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{
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var outputType = typeof(IDictionary<string, object>);
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var inputType = obj.GetType();
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var inputExpression = Expression.Parameter(typeof(object), "input");
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var typedInputExpression = Expression.Convert(inputExpression, inputType);
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var outputVariable = Expression.Variable(outputType, "output");
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var returnTarget = Expression.Label(outputType);
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var body = new List<Expression>
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{
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Expression.Assign(outputVariable, Expression.New(DictionaryConstructor))
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};
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body.AddRange(
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from prop in inputType.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.FlattenHierarchy)
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where prop.CanRead && (prop.PropertyType.IsPrimitive || prop.PropertyType == typeof(string))
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let getExpression = Expression.Property(typedInputExpression, prop.GetMethod)
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let convertExpression = Expression.Convert(getExpression, typeof(object))
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select Expression.Call(outputVariable, AddToDicitonaryMethod, Expression.Constant(prop.Name), convertExpression));
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body.Add(Expression.Return(returnTarget, outputVariable));
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body.Add(Expression.Label(returnTarget, Expression.Constant(null, outputType)));
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var lambdaExpression = Expression.Lambda<Func<object, IDictionary<string, object>>>(
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Expression.Block(new[] { outputVariable }, body),
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inputExpression);
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return lambdaExpression.Compile();
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})(obj);
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}
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}
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