58 lines
2.7 KiB
C#
58 lines
2.7 KiB
C#
using System.Linq.Expressions;
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namespace JNPF.Common.Extension
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{
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public static class LambdaExpressionExtensions
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{
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public static void PropertySetValue<T>(this T instance, string propertyName, string value)
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{
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if (!PropertySet<T>.ValueFactories.TryGetValue(propertyName, out Action<object, object> setAction))
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{
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setAction = PropertySet<T>.CreateSetPropertyValueAction(propertyName);
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PropertySet<T>.ValueFactories.Add(propertyName, setAction);
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}
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setAction(instance, value);
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}
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public static void PropertySetValue<T>(this T instance, string propertyName, object value)
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{
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if (!PropertySet<T>.ValueFactories2.TryGetValue(propertyName, out Action<T, object> setAction))
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{
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setAction = PropertySet<T>.CreateSetPropertyValueAction2(propertyName);
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PropertySet<T>.ValueFactories2.Add(propertyName, setAction);
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}
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setAction(instance, value);
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}
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}
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public class PropertySet<T>
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{
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public static Dictionary<string, Action<object, object>> ValueFactories = new Dictionary<string, Action<object, object>>(StringComparer.OrdinalIgnoreCase);
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public static Dictionary<string, Action<T, object>> ValueFactories2 = new Dictionary<string, Action<T, object>>(StringComparer.OrdinalIgnoreCase);
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public static Action<object, object> CreateSetPropertyValueAction(string propertyName)
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{
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var property = typeof(T).GetProperty(propertyName);
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var target = Expression.Parameter(typeof(object));
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var propertyValue = Expression.Parameter(typeof(object));
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var castTarget = Expression.Convert(target, typeof(T));
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var castPropertyValue = Expression.Convert(propertyValue, property!.PropertyType);
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var setPropertyValue = Expression.Call(castTarget, property.GetSetMethod()!, castPropertyValue);
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return Expression.Lambda<Action<object, object>>(setPropertyValue, target, propertyValue).Compile();
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}
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public static Action<T, object> CreateSetPropertyValueAction2(string propertyName)
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{
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var property = typeof(T).GetProperty(propertyName);
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var target = Expression.Parameter(typeof(T));
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var propExp = Expression.Property(target, propertyName);
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var propertyValue = Expression.Parameter(typeof(object));
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var castPropertyValue = Expression.Convert(propertyValue, property!.PropertyType);
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var assignExp = Expression.Assign(propExp, castPropertyValue);
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return Expression.Lambda<Action<T, object>>(assignExp, new[] { target, propertyValue }).Compile();
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}
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}
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}
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