從表達式映射中分配一個值

Question

我使用Expression<Func<TEntity, object>>映射屬性。

我只需要從對象中獲取屬性值直到知道。如何使用該表達式分配值？

Answer 1

試試這個，假設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; 

那麼就使用的SetValue