30 lines
885 B
C#
30 lines
885 B
C#
using System;
|
|
using System.Collections.Generic;
|
|
using System.Linq.Expressions;
|
|
using Cysharp.Text;
|
|
|
|
public static class InstanceFactory
|
|
{
|
|
private static readonly Dictionary<Type, Func<object>> _constructorCache = new();
|
|
|
|
public static object CreateInstanceOptimized(Type type)
|
|
{
|
|
if (!_constructorCache.TryGetValue(type, out var constructor))
|
|
{
|
|
var ctor = type.GetConstructor(Type.EmptyTypes);
|
|
if (ctor == null)
|
|
{
|
|
throw new MissingMethodException(ZString.Format("Type {0} missing public parameterless constructor", type.Name));
|
|
}
|
|
|
|
var newExpr = Expression.New(ctor);
|
|
var lambda = Expression.Lambda<Func<object>>(newExpr);
|
|
constructor = lambda.Compile();
|
|
|
|
_constructorCache[type] = constructor;
|
|
}
|
|
|
|
return constructor();
|
|
}
|
|
}
|