从表达式映射中分配值

Question

我使用Expression<Func<TEntity, object>>映射属性。

我只需要从对象中获取属性值，直到知道为止。如何使用该表达式分配值？

Answer 1

尝试此操作，假设为expression = Expression<Func<TEntity, object>>：

MemberExpression memberExpression;

switch (expression.Body.NodeType)
{
  case ExpressionType.Convert:
    memberExpression = ((UnaryExpression) expression.Body).Operand as MemberExpression;
    break;
  case ExpressionType.MemberAccess:
    memberExpression = expression.Body as MemberExpression;
    break;
}

var propInfo = memberExpression.Member as PropertyInfo;

然后只使用SetValue