c# - 如何使用反射来调用 DbModelBuilder.Entity.Ignore(x => x.Property)？

Question

我正在基于我的 poco 类上的属性动态执行流畅的映射，我的 .Property 案例工作正常，但在尝试运行 .Ignore() 方法时失败了:

private void AddEntities(DbModelBuilder modelBuilder)
{
    var entityMethod = typeof(DbModelBuilder).GetMethod("Entity");
    foreach (var entityType in EntityBaseTypes)
    {
        dynamic entityConfiguration = entityMethod.MakeGenericMethod(entityType).Invoke(modelBuilder, new object[] { });
        foreach (PropertyInfo propertyInfo in entityType.GetProperties().Where(x => x.CanWrite))
        {

            foreach (var attribute in propertyInfo.GetCustomAttributes())
            {
                LambdaExpression propertyLambda = PropertyGetLambda(entityType, propertyInfo.Name, typeof(string));
                string attributeName = attribute.GetType().Name;
                if (attributeName == "NotMappedAttribute")
                {
                    MethodInfo ignoreMethod = (MethodInfo)entityConfiguration.GetType().GetMethod("Ignore");                            
//BLOWS UP HERE: Late bound operations cannot be performed on types or methods for which ContainsGenericParameters is true
                    ignoreMethod.Invoke(entityConfiguration, new[] { propertyLambda });

                }
                else if (attributeName == "ColumnAttribute")
                {
                    dynamic column = attribute;
                    var propertyMethod = entityConfiguration.GetType().GetMethod("Property", new Type[] { propertyLambda.GetType() });
                    var entityProperty = (PrimitivePropertyConfiguration)propertyMethod.Invoke(entityConfiguration, new[] { propertyLambda });
//WORKS FINE:
                    entityProperty.HasColumnName(column.Name);
                }
            }
        }

    }
}

我认为 .Ignore() 方法参数所需的类型不同。这是我试图调用的方法:.Ignore()

public void Ignore<TProperty>(
    Expression<Func<TStructuralType, TProperty>> propertyExpression
)

Answer 1

我认为您需要使用以下方法获取 Ignore 方法的 MemberInfo:

MethodInfo ignoreMethod = typeof(StructuralTypeConfiguration<>)
    .MakeGenericType(entityType)
    .GetMethod("Ignore")
    .MakeGenericMethod(propertyInfo.PropertyType);

Ignore 是一种方法，其通用参数对应于 Expression 的属性类型，因此您需要在尝试调用它之前提供属性类型。